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Distribution characteristics and oil mobility thresholds in lacustrine shale reservoir:Insights from N_(2)adsorption experiments on samples prior to and following hydrocarbon extraction

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Petroleum Science 2022年第2期19卷 486-497页

作者： Long-Hui Bai Bo Liu Yi-Jing Du Bo-Yang Wang Shan-Si Tian Liu Wang Zhi-Qiang Xue Accumulation and Development of Unconventional oil and Gas State Key Laboratory Cultivation BaseNortheast Petroleum UniversityDaqingHeilongjiang 163318China Hubei Key Laboratory of Petroleum Geochemistry and Environment Yangtze UniversityWuhanHubei 430100China Research Institute of Petroleum Exploration&Development Beijing100083China No.1 Institute of Geological and Mineral Resources Survey of Henan LuoyangHenan 471000China

The pore structure and oil content of shales have an important influence on the oil mobility and *** this study,the lacustrine shale samples from the Qingshankou Formation(Q1)of Songliao Basin were ***,pyrolysis,XRD and nitrogen adsorption were performed on the original and extracted shale *** the influence of mineral composition and organic matter(OM)on the development of nano-scale pore,the oil phase states and mobility were *** Q1 shale samples can be sub-divided into three types according to the isotherm *** A samples are characterized by high kerogen content,with oil mainly existing in the free phase *** B samples are characterized by medium kerogen content,oil mainly exists in the absorbed phase *** C samples are characterized by low kerogen content,with trace oil found in the absorbed phase ***-scale organic pores are well developed in the Q1 *** is primarily found in the pore spaces with diameters less than 10 nm,this being the pore size threshold for mobile shale *** TOC>2.0 wt%and EOM>1.0 wt%,Q1 Formation shale oil mobility is high,resulting in prospective drilling targets.

关键词： shale oil mobility oil phase state Extraction Nitrogen adsorption

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A new method for evaluating the oil mobility based on the relationship between pore structure and state of oil

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Geoscience Frontiers 2023年第6期14卷 432-449页

作者： Longhui Bai Bo Liu Xiaofei Fu Qinhong Hu Qiuli Huo Liu Wang Qiming Wang Li FuMehdi Ostadhassan Key Laboratory of Continental shale Hydrocarbon Accumulation and Efficient Development Ministry of EducationNortheast Petroleum UniversityDaqing 163318China Department of Earth and Environmental Sciences The University of Texas at ArlingtonTX 76019USA Shandong Provincial Key Laboratory of Deep oil and Gas China University of Petroleum(East China)Qingdao 266580China Research Institute of Exploration and Development of Daqing oilfield Company Ltd. Daqing 163712China

An accurate evaluation of the shale oil mobility is crucial to its cost-effective *** study presents a method to assess shale oil mobility by integrating the pore structure and oil states ***,a set of three discrete organic extracts(EOM-A,B and C)were obtained by sequential *** relationships among the EOMs and the oil states were inferred from the group compositions and fluorescence properties of the produced shale oil(free state).The results showed that EOMs A and B represent free oil in the open and closed pores,respectively,while the EOM-C represents adsorbed ***,NMR T_(1)-T_(2)map is used to determine the T_(2-cutoff)values that indicate the pore size ranges of different oil *** oil resides mainly in larger pore space(T_(2)>0.5 ms),while the adsorbed oil in smaller pore space(0.2 msoil(F/A)>0.5 and T_(2-cutoff)>1.0 ms suggest that the free oil in connected pores has the highest *** work can provide a reference for evaluating the shale oil potential and prospectivity in other regions.

关键词： Qingshankou Formation Sequential extraction NMR T_(1)-T_(2) Free and adsorbed oil shale oil mobility

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