Adam Mickiewicz University, Poland
Hypertrophic conditions in coastal lakes (CL) of southern Baltic result in intense productivity of phytoplankton and lead to enhanced sedimentation of labile organic matter (LOM). Microbial degradation of the LOM releases greenhouse gases which are transferred to the atmosphere via molecular diffusion and ebullition. Between 2014 and 2015 seven CLs along the Polish Baltic coast were subject to complex biogeochemical monitoring aiming at estimating annual emission of CH4, CO2 and N2O.
It has been established that:
CL acts as net sources of CH4 and N2O. The estimated CH4 flux is 16.27±26.56 mgC⋅m-2⋅d-1 and N2O flux is 0.76±0.54 mgN2O⋅m-2⋅d-1. During summer CL are autotrophic i.e. absorb CO2 from the ambient air and the CO2 flux is -640.4±222.2 mgC⋅m-2⋅d-1. In winter CL change to heterotrophic and CO2 flux is 14078.4±7626.7 mgC⋅m-2⋅d-1.
In CL methane is predominantly formed via acetate fermentation.
Biogeochemical processes in CL are to a large degree controlled by wind-induced sediment mixing and the depth of methanogenic zone (MZ) is dependent on hydrodynamic conditions. In non-disturbed sediments MZ occurs c.a. 10 cm below the bottom and diffusion of CH4 to the water column occurs throughout the whole year. In deeply mixed sediments the depth of MZ is higher and diffusion of CH4 to lake water is reduced.
Microbial gases are transported from the sediment to the atmosphere via ebullition; however, enhanced turbulence and oxygenation lead to dissolution of gas bubbles in lake water column.
Gas exchange in CL is affected by macrophytes via bioventilation.
Biography:
Dr. Michal Woszczyk holds a PhD in geology (earned in 2005) and habilitation in geography (earned in 2016) and currently works as associate professor at the Faculty of Geographical and Geological Sciences, Adam Mickiewicz University, Poznań, Poland. His research is aimed at understanding the functioning and long-term evolution of estuaries with the main focus put on sedimentary and biogeochemical processes. In addition, he is involved in paleolimnological studies of inland lakes. He authored and co-author of over 30 publications.
1Alexandria University, Egypt
2Menoufia University, Egypt
3National Institutes of Oceanography and Fisheries, Egypt
The Lake Manzala lies in the north-east Nile Delta region, between latitudes 31° 00ʹ - 31° 35ʹ N and longitudes 31° 45ʹ - 32° 15ʹ E. The Lake aquatic system is highly dynamic; however, it has been heavily affected during the last few decades by the continuous surplus of untreated industrial, domestic and agricultural land-based discharges. The current work investigates the foraminiferal assemblage distribution and evaluates the foraminiferal community responses to environmental stressors in Lake Manzala. Sediment samples were collected from 25 stations, distributed throughout the lake, during 2014. Foraminiferal community structure, organic matter and heavy metals, including Fe, Pb, Cu, Cd, Zn, Ni and Co were analyzed.
The results revealed that the Lake Manzala sediments are characterized by high organic matter and heavy metals concentrations. Species richness is low in all stations; indicating that the lake is under severe ecological stress. The lowest diversity exists in the east and south sectors of the Lake which are characterized by low salinity and high organic matter and heavy metals concentrations. Dwarf and brittle tests are the direct response to low salinity and anoxic conditions. The euryhaline species, Ammonia tepida, dominates the foraminiferal assemblage in this brackish-water ecosystem. The scarcity of sensitive Miliolids and living individuals are also considered an indication of the ecological stress in the lake. The increase in Foraminiferal Abnormality Index (FAI) and the severe deformation are related directly to increase in heavy metals contents. In conclusion, this study indicates that foraminiferal assemblages are a reliable bioindicator to multiple anthropogenic stressors in Lake Manzala.
Biography:
Dr. Ahmed Mohamed Badr-ElDin currently works as Lecturer of Marine Geology, Oceanography, Faculty of Science at Alexandria University. He had received a Ph.D. in Marine Geology from Alexandria University in 2008. He published two papers in refereed journals and Participated in a number of local, regional and international conferences and also supervised four MSC theses in Alexandria University. Ahmed Mohamed Badr-ElDin was awarded a Post-Doctoral Fellowship at Kagoshima University, Japan, 2010. He was also a participant in Erasmus Mobility Programme - Southampton University, Great Britain, 2018.
Salahaddin University-Science College, Iraq
The Ordovician deltaic to shallow marine Khabour Formation in Northern Iraq consists mainly of sandstone with minor siltstone and interbedded shale. The sandstones are pervasively cemented by quartz that resulted in very little preserved primary porosity. Cathodoluminescence and petrographic studies showed that the silica cementation occurred in five successive phases which can be distinguished by their luminescence pattern. The precipitations of two phases have predated the major compaction process while the other phases are younger. The successive phases represent a sequence of changes in silica supply which were classified as very early and early, derived from dissolved biogenic silica that precipitated as opal/micro quartz, possibly pre-compactional and of non-luminescent quartz overgrowth type. This was followed by phases whose silica supply derived from pressure solution of quartz, dissolution of feldspar and hydrothermal fluids related to major thrust fault event. These successive quartz cement phases showed an increase in luminescence and the development of complicated zonation pattern in late-stage quartz cementation.
Biography:
Dr. Muhamed Fakhri Omer is currently working as Assistant Professor at the department of geology, Salahaddin University in Erbil, Iraq. He worked as Lecturer at the department of geology, Salahaddin University in Erbil, Iraq (2004). He has participated in many local and international conferences with oral presentations and workshop activities. He has published many papers in the Journal of African Earth Science, Arabian Journal of Geosciences and Turkish Journal of Earth Sciences in 2014, 2015, 2016 and 2018.
1Seismological Institute of Academy of Sciences (On leave), Albania
2Missouri University Science and Technology (On leave), USA
New Madrid Seismic Zone (NMSZ) in the United States, is one the most active dangereous seismic zones, where NS and EW highways are crossing. According to the satellite data in this zone, during the strongest earthquakes of 1811-1812, a lot of liquefaction phenomena were observed in the Missisipi embankment. Based on historical and intensity data, the moment magnitude of the strongest shock of 12/16/1811 at 02h 15m a.m. earthquake, was proposed to be as MW =7.0-7.5. As there is a lack of strong motion data, for the study of nonlinear site response analysis of two sites under bridge construction, synthetic accelerograms were used. For determination of soil profiles, SASW technique was used and compared with other in-situ techniques. This paper focuses on the engineering significance of the geophysical methods used for the purpose ground response analysis. Author of this paper participated in FHWA project for bridges in NMSZ with a research team of Missouri UST, in Rolla.
Biography:
Dr. Siaisi Kociu had been director during 1993 at Seismological Center, Tirana, Albania and he had been Professor and Head of the department of Engineering Seismology at Seismological Institute, Ac. Sc., and Tirana, Albania.
Moscow Institute of Physics and Technology, Russia
High-precision seismic angular motion sensors are capable of substantially change the instrumentation base of modern seismic. The use of such sensors in composition of modern seismic complexes will increase the efficiency use of natural resources, accelerate exploration, reduce their cost, increase the reliability of the data obtained due to higher sensitivity and ease of use. Also angular motion sensors, despite the targeted focus on the seismic, can be successfully used to solve the problems of structural health monitoring (SHM) and also be used to protect extended territories. For use in seismology angular motion sensors should have a sensitivity of about 10-8 rad / s / √Hz and low sensitivity to linear movements. Today does not exist devices meeting these requirements.
We conducted a theoretical calculation and an experiment to measure the self-noise of an angular motion sensor based on molecular-electronic technology (MET) with a modified configuration of the electrode grid and connected electronics in the practically important frequency range of 1-100 Hz.
We proposed technical solutions for development an angular motion sensor based on molecular-electronic technology with a record low level of self-noise (about 10-9 rad / s / √Hz).
This work was financially supported by the Ministry of Science and Higher Education of Russian Federation under statement #3.3197.2017/ПЧ and by the Russian Foundation for Basic Research under statement #18-55-06021-Аз-а.
Biography:
Anikin Evgenii was born in Ulyanovsk, Russia in 1995. He has received a bachelorʼs degree at the Moscow Institute of Physics and Technology (MIPT) in the field of applied mathematics and physics in 2017. He is the winner of the competition “UMNIK” 2017 from Innovation Promotion Fund. In 2018, he has participated in the plenary session from the Russian side at 3rd BRICS Young Scientist Forum BRICS (South Africa). He currently works as research assistant in the Center for Molecular Electronics at MIPT since 2016. Research interests include electronics, hydrodynamics, electrochemistry, applied physics, seismology and signal analysis.
1Moscow Institute of Physics and Technology, Russia
2“R-sensors” LLC, Russia
The development of modern methods of geophysical monitoring imposes ever higher requirements on instrumental means of recording seismic signals, which poses the task of finding new technologies for sensors of primary information. Molecular-electronic technology (MET) measurers have recently become increasingly used in such areas as land and offshore seismic prospecting, monitoring of building structures, world ocean studies and even the study of medical and sport science. The advantages of modern sensors based on MET are high sensitivity, low level of self-noise combined with low production costs.
At the same time, the transfer characteristic of MET devices is determined by the type of electrolyte used, which implies that its viscosity and diffusion coefficient vary quite intensely with temperature, so the MET transfer characteristics significantly depend on the temperature. Therefore, when designing final measuring instruments, special attention is being paid to the methods of compensating the temperature drift of the amplitude-frequency response (AFR). To do this, it is essential to know precisely the behavior of the MET characteristic in the entire operating temperature range. The intricacy of its studying is conditioned by the fact that the complete transfer function is determined by mechanical and electrochemical subsystems which have a rather complicated frequency and temperature dependences.
This research represents the clear analytical model describing the temperature dependence of the AFR of the MET in the wide frequency and temperature ranges which is verified by experimental results for different types of electrolytes used in traditional MET devices.
This work was financially supported by the Ministry of Science and Higher Education of Russian Federation under statement #3.3197.2017/ПЧ and by the Russian Foundation for Basic Research under statement #17-07-70106
Biography:
Dmitry A Chikishev was born in Ulyanovsk, Russia, in 1996. He had received the B.S. degree in applied mathematics and physics from the Moscow Institute of Physics and Technology (MIPT), Moscow, in 2017. He had won grant at competition UMNIK 2017 from Foundation for Assistance to Small Innovative Enterprises (FASIE). He has been a Research Assistant with the “R-sensors” LLC, Dolgoprudniy, Russia, from 2016 to 2018. Since 2018, Dmitry has been an Engineer at Scientific and Technological Center of Marine Geophysics, MIPT. His research interests include electronics, electrochemistry, hydrodynamics, applied physics, seismology and signal analysis.
Modern oil wells are longer, deeper and hotter than ever before. This is due to depletion of easily accessible hydrocarbon deposits and need to develop deep oil and gas fields (≥7KM). Such depths are characterized by high ambient temperatures (120 - 260 ° C) and pressures (69 - 241 MPa). That is why the development, operation and probing of deep fields require to use a specific elemental base (classical equipment is not applicable for such purposes). In addition to stable operation at high temperatures and pressures, sensors for downhole sondes should have high sensitivity. In this regard, sensors based on molecular-electronic technology (MET), which have extremely high sensitivity and low self-noise, can be a good alternative to existing solutions [1], [2].
In this scientific work, high-temperature sensor based on MET has been developed. For the first time, the transfer characteristics of the MET sensor obtained in the extended temperature range (25 - 125 ° C) and external pressure of 10 atm. New theoretical model has been created, based on the obtained experimental data, which allows describing analytically the transfer function of MET sensor in an extended temperature range. A physical model was tested with several alternative techniques. The obtained results will help create a fundamentally new high-temperature sensor based on MET with parameters significantly different from existing market solutions.
This work was financially supported by the Ministry of Science and Higher Education of Russian Federation under statement 3.3197.2017/ПЧ and by the Russian Foundation for Basic Research under statement 18-05-70106.
1) 29. Shabalina, A.S.; Egorov, E.V.; Zaitsev, D.L. High resolution miniature MET sensors for healthcare and sport applications, Twelfth International Conference on Sensing Technology, 2018, Ireland, pp. 287-292.
2) 25. Zaitsev, D.L.; Agafonov, V.M.; Avdukhina, S. Yu.; Egorov, E.V. Broadband MET hydrophone 80th EAGE Conference & Exhibition 2018 11-14 June 2018, Copenhagen, Denmark.
Biography:
Ilya A Evseev was born in Podolsk, Russia, in 1995. He has graduated from the Lyceum №1511 at the NRNU “MEPhI” in 2013. He is a finalist of Intel ISEF 2013. He had won grant at competition UMNIK 2017 from Foundation for Assistance to Small Innovative Enterprises (FASIE). He has received the B.S. degrees in applied mathematics and physics from the Moscow Institute of Physics and Technology (MIPT), Moscow in 2017. He has been a Research Assistant with the Center for Molecular Electronics, MIPT, since 2016. His research interests include electronics, electrochemistry, applied physics and seismology.
Marine and Coastal Resources Research and Development Center, Thailand
An experiment was aimed to investigate the effect of salinity levels on survival, growth indices Sea grass Enhalusacoroides (Linnaeus f.) Royle, 1839. Four salinity levels were used, i.e. natural seawater 32 ppt (control), saltwater 30, 20 and 10 ppt. The sea grasses were seeded for 31 days. Fifty seeds of sea grass per/15 litres were seeded culture of seagrass in the aquaria, each with a dimension of 44x25x20 cm3. Initial mean length from natural seawater of sea grass were 4.74 cm. (SD±0.45) in the sea water 3.15 cm. (SD±0.29), 3.32 cm. (SD±0.27) and 3.33 cm. (SD±0.31) with survival total 100 percentage seeded of every salinity. A Completely Randomized Design (CRD) with three replications was used. The results showed that the seeded were able to growth well to natural seawater (32 ppt) and salt water levels yet a severe growth rate was observed at 20 and 10 ppt after being seeded cultured from 31 days and survival rate seeded of every salinity there were no statistical differences found with regard to final seeded seagrass length, found with statistical differences at natural seawater 32 ppt and saltwater levels 10 ppt (P>0.05). The optimal salinity level of 32 ppt (natural sea water) gave the highest growth performance for the seeded seagrass when cultured within a 31 days period. A sea water level 10 and 20 ppt for 31 days gave growth performance nearly similar to the control treatment (natural seawater at 32 ppt).
Keywords: Growth, Survival, Enhalusacoroides (Linnaeus f.) Royle, 1839. Salinity levels
Biography:
Mr. Suthep Jualaong is Director of Marine and Coastal Resources Research and Development Center Lower Gulf of Thailand. His scientific interest in the taxonomy, diversity, conservation of sea turtle and sea grass. Next to more traditional methods and experiments, he combines natural history information with recently developed collection based macrobenthos approaches for species distribution and indicator of environmental.
1China University of Geosciences, China2Wuh China Geological Survey, China
The granitoid-greenstone belt of Central Eritrea is part of the Arabian-Nubian Shield that was primarily formed by accretion of juvenile island-arcs during the Neoproterozoic. The supracrustal rocks in the study area are dominated by metavolcano-sedimentary assemblages invaded by granitoid rocks. The metavolcanic rocks show large variation of major and trace element compositions that form linear correlations against SiO2, suggesting they are genetically linked and their variation mainly resulted from fractional crystallization. In general, they have flat chondrite normalized REE pattern with slight negative Eu-anomalies and rich in LILE (Ba, Pb and U) but depleted in HFSE (Ta, Nb and Ti) in the multi-element diagram. They also have low initial 87Sr/86Sr, positive ɛNd values (+4.0 to +6.4) and moderate Pb isotopic compositions. These features indicate that their mantle source was significantly modified by slab-derived fluids and melts.
The ca. 850 Ma Emba-Derho granites display restricted composition range with high SiO2, Al2O3, Na2O, Fe2O3T and low K2O. They have characteristics features of adakitic rocks with high Sr/Y ratio and low Y. The samples exhibit a highly fractionated REE and insignificant Eu-anomalies (Eu/Eu* = 0.89-1.07), while their multi-element diagram shows elevated LILE (Ba, Pb and Sr) and troughs of the HFSE (Ta, Nb and Ti). They also have low initial Sr (0.7008-0.7026) and high ɛNd (+4.7 to +7.8) implying their source is a juvenile oceanic crust. These geochemical compositions suggest that the granites were originated from high pressure partial melting of a subducting slab. Both the metavolcanic and the associated granitic intrusions are suggested to have been formed in a fore-arc setting.
Biography:
Ghebsha has been working as a lecturer in the Department of Earth Sciences at Eritrea Institute of Technology, Eritrea since 2009 and is a member of Geological Survey of Eritrea.
Ghebsha has been awarded degrees, a Bachelor of Science in Geology from University of Asmara, Eritrea and Master of Science in Mining Engineering from Wuhan University of Technology, China. Currently, Ghebsha is a PhD student in Geochemistry at China University of Geosciences (Wuhan), P.R. of China. His areas of research interest include Precambrian geology and mineral deposit geochemistry.
University of Cadi Ayyad, Morocco
Sedimentological and palaeontological analysis of the Aptian- Albian sedimentary succession of the Ait Ourir Basin in the High Atlas Mountains of Marrakech in Morocco provided new data on the section previously poorly understood. The palaeo environmental evolution was deduced based on an analysis of facies, depositional environments and stratigraphy. Within the Aptian-Albian succession, we have distinguished seven units (U1-U7) and two sedimentary sequences separated by a major discontinuity.
The first sequence is composed of calcareous and dolomitic marls of the Tadhart Formation (Gargasian in age) and the Lemgo Formation of (Clansayesian in age). These two transgressive formations were formed in an internal carbonate platform (the intertidal zone to the subtidal zone). The second sequence, Albian in age, is composed of sandy limestones of the Oued Tidzi and is represented by sediments showing terrigenous influences.
Requieniid rudist Pseudotoucasia Catalaunica indicating the late Aptian age was described recently from the Tadhart Formation, this species differs from Pseudotoucasia santanderensis by the shape of the RV myophore, the shell size and the morphology of the posterior side of the right valve; but the two species are phylogenetically related.
Lower Cretaceous scleractinian corals (Eugyra, Thalamocaeniopsis, Holocystis) are reported for the first time from Morocco.
Keywords: Carbonate Platform, Ichnofacies, Rudists bivalves, Corals, Aptian, Albian, High Atlas, Morocco
Biography:
Fatiha Hadach is currently pursuing PhD at laboratory 2GRNT, Faculty of sciences Semlalia, Cadi Ayyad University, Marrakech, Morocco.
Pandit Deendayal Petroleum University, India
Sympathize the feasibility concept between injected fluids and reservoir crude oils are dominant for developing conventional and enhanced oil recovery (EOR) methods for optimization of production for high temperature and high salinity carbonate reservoirs. Chemical methods with surfactants, polymers and alkalies are gaining importance where surfactants-assisted methods are expected to play a major role in enhancing future crude oil production. A number of surfactants which exhibit ultra-squat IFT and excellent micro-emulsion phase behavior with crude oils of low to medium API gravity are sufficiently soluble at high salinity to produce stable mellifluous solutions. Such solutions often show phase separation or we can say phase behavior after a few days at reservoir temperature, while compared to the residence time in a reservoir for an effective surfactant flooding. The behavior of surfactants in aqueous solution shows the feasibility of surfactant flooding in harsh condition carbonate reservoir. Anionic surfactants such as ABS, AOS with large hydrophobes produce lowest IFT but are often sufficiently water soluble at appropriate salinity. The stability of the oil-water emulsion is visualized with respect to time, temperature and the salinity of the brine and attentiveness of the surfactants.
In this research work, we used one crude oil sample and two polar surfactants like (Alkyl Benzene Sulphonate- ABS) and (Alkyl Olefin Sulphonate- AOS), at harsh condition for carbonate reservoir to understand the feasibility of surfactants at high temperature and high salinity. Pre-screening test is performed for surfactant solution at desired temperature to check the cloud formation/turbidity of solution. Dynamic light scattering (DLS) experiments were conducted on both the surfactants aqueous solution at varying salinity. Study result defines the average size of the oil components trap in it. The UV- visible spectroscopy test for surfactant thermal stability at different temperatures with varying salinity was conducted. The absorption spectra of surfactant aqueous solution shows peak in results as the stability of surfactants at particular temperature and salinities. The fluorescence spectroscopy result shows the presence of oil components in the micro-emulsion phase. The Fourier-transform infrared spectroscopy is being used to define the infrared spectrum of any composition present in oil sample.
Keywords: Enhanced Oil Recovery, Surfactant Flooding, Surfactant pre-screening test, Micro-Emulsion, Dynamic light scattering, UV-visible spectroscopy, Fluorescence spectroscopy, Fourier-transform infrared spectroscopy.
Biography:
Suryapratapsingh Bhadauria is currently pursuing Master of Technology course in Petroleum Engineering. His expertise in defining the feasibility of various surfactants used in Enhanced oil recovery and open and contextual identification is based on phase behavior of solutions that means how is it change with the effect of high temperature and salinity, under the guidance of Uttam Kumar Bhui (Associate Prof.). He had acquired a sound overall knowledge of leading edge engineering principles, research and development, with emphasis on designing, modeling and testing of various surfactants used oil industries. He is proficient in the use of various experiments like UV-visible spectroscopy, Fluorescence spectroscopy, Zeta-particle, etc. He had done Bachelor of Technology in Mechanical Engineering from Gujarat Technological University, Gujarat, India and his expertise is mostly on Production, Manufacturing, Management Strategy, etc. His personal attributes include leadership and sound judgment as well as creativity, analytical and Managerial role and interact with various peoples from different backgrounds based on oil industries and done internship based on his research work.
Pandit Deendayal Petroleum University, India
Statement of the Problem: Bioturbation is a prominent type of heterogeneity that exists in the reservoir and has an impact on the porosity-permeability distribution and resulting flow behavior. It is a common perception that bioturbation reduces the permeability of the primary sedimentary fabric mainly because biogenic agitating of stratified sediment lowers the sorting of the sediment, inhibiting flow capability. In recent times, most of the producing reservoirs are found to be bioturbated, contrary to the initial belief. Hence when characterizing heterogeneous reservoir, the degree of bioturbation and its effect on reservoir quality are important parameters (porosity and permeability). However, there is still a lack of knowledge on the impact of bioturbation on porosity-permeability distribution in reservoir rocks, especially in Indian context. The Bhuj formation (Guneri), is a variably bioturbated sandstone unit occurring in outcrops in Kachchh basin. The present study is aimed at estimating the impact of bioturbation on the porosity of reservoir rocks of the Bhuj formation (Guneri).
Methodology & Theoretical Orientation: The Bhuj formation provides a good outcrop correspondent of clastic reservoirs throughout the Kachchh Basin. The Guneri member of the Bhuj formation has various degree of bioturbation (BI-0 to BI5) making this as a suitable candidate for sampling. Thin-sections were prepared to estimate porosity, by vacuum impregnating the epoxy in the clastic rock cut from the outcrop samples. The thin-sections were examined for a pore size and pore space analysis using an integrated petrographic image analysis (PIA) system consisting of high-resolution microscope adapted with a digital camera for image acquisition and open source image analysis software (ImageJ) package for image processing. The methodology developed allows estimation of pore throat and pore size from the thin section image.
Findings: The image analysis software was used to measure fundamental textural properties observed in thin-section. Data sets were generated from the thin section image analysis using point counting variables such as porosity and pore size distribution. The developed methodology successfully estimated porosity, which was validated from routine core analysis.
Conclusion & Significance: Thin-section analysis is essential as reservoir properties can be directly observed and key details regarding reservoir conditions better understood. Ultimately, critical details regarding reservoir quality can aid in the design of better and more efficient oil recovery methods.
Biography:
Shubham Saraf is currently pursuing Master of Technology course in Petroleum Engineering and his expertise in Image process analysis and Petrophysical parameter identification. Open and contextual identification is based on a pore network model to responsive constructivists creates new pathways for improving oil recovery technique under the guideline of Bhawanisingh G Desai. He has acquired a sound overall knowledge of leading edge engineering principles, research and development, with emphasis on designing, modeling and testing of Petroleum geological model development system and proficient in the use of various modeling software including current releases of ImageJ, Petrel, Matlab, etc.
He had done Bachelor of Technology degree in Mechanical Engineering from Gujarat Technological University and his expertise is also in designing, modeling and quality analysis system. His personal attributes include leadership and sound judgment as well as creativity, analytical and troubleshooting skills and interact productively with people from diverse backgrounds and have a history of quality work carried to timely completion.
Kyushu University, Japan
Harshsalinity formation brine has always put a challenge on surfactant EOR. Reduction of efficiency of the technique has been reported by many researchers. The main causes are the high adsorption and precipitation of surfactant. This experimental study investigates and provides a possible way to enhance oil production after surfactant has been adsorbed onto rock surface. Sodium dodecylbenzene sulfonate (SDBS), anionic type surfactant, was used to measure its adsorption onto Berea sandstone with the effect of formation salinity (3 and 5 wt. % NaCl). After that, degree of SDBS desorption was compared between using soft brine (1 wt. % NaCl) and synthesized formation brines. Study of effect salinity modification on oil recovery was then performed by spontaneous imbibition tests. Spontaneous imbibition test begins with synthesized brine (1st stage), followed by SDBS solution (2nd stage) and finished by synthesized brine or soft brine (3rd stage) on oil saturated cores.
The results revealed that 1.8% and 5% improve in oil recovery was observed in the 3rd stage by using soft brine over 3 and 5 wt.% synthetic brine respectively. This increment was attributed to increase in SDBS desorption and better IFT reduction. Up to 32% of desorption was mitigated and it further lower IFT by 82% in using soft brine comparing to no salinity modification cases.
Biography:
Ichhuy Ngo had done his Bachelor degree in Geo-resources and Geotechnical Engineering at Institute of Technology of Cambodia and Master Degree in Petroleum Engineering at Chulalongkorn University, Thailand. He is currently pursuing his doctoral degree in Resources Production laboratory in Kyushu University, Japan. His main research interest is enhanced oil recovery by using surfactant as chemical EOR.
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