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Formation of inter-salt overpressure fractures and their significances to shale oil and gas: A case study of the third member of Paleogene Shahejie Formation in dongpu sag, Bohai Bay Basin

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Petroleum Exploration and Development 2020年第3期47卷 560-571页

作者： LIU Weibin ZHOU Xingui XU Xingyou ZHANG Shiqi Oil&Gas Survey China Geological SurveyBeijing 100029China China University of Petroleum Qingdao 266580China

Taking the inter-salt organic-rich shales in the third member of Paleogene Shahejie Formation(Es3)of dongpu sag in Bohai Bay Basin as an example,the origin of overpressure,development characteristics,formation and evolution mechanism,formation stages and geological significance on shale oil and gas of overpressure fractures in the inter-salt shale reservoir were investigated by means of thin section identification,scanning electron microscopy observation,analysis of fluid inclusions,logging data analysis,and formation pressure *** results show that overpressure is universal in the salt-lake basin of dongpu sag,and under-compaction caused by the sealing of salt-gypsum layer,pressurization due to hydrocarbon generation,transformation and dehydration of clay minerals,and fault sealing are the 4 main factors leading to the occurrence of *** overpressure fractures are small in scale,with an average length of 356.2μm and an average underground opening of 11.6μ*** they are densely developed,with an average surface density of 0.76 cm/***,they are often accompanied by oil and gas charging,and thus high in *** fractures were mainly formed during two periods of large-scale oil and gas charging,approximately 25-30 Ma ago and 0-5 Ma ***-salt overpressure fractures play dual roles as the storage space and migration paths of shale oil and *** contribute 22.3%to the porosity of shale reservoir and 51.4%to the *** can connect fracture systems of multiple scales,greatly improving the quality of shale *** the development of shale oil and gas,inter-salt overpressure fractures can affect the extension and morphology of hydraulic fractures,giving rise to complex and highly permeable volumetric fracture networks,improving hydraulic fracturing effect and enhancing shale oil and gas productivity.

关键词： shale reservoir inter-salt overpressure overpressure fracture fractures formation and evolution Bohai Bay Basin dongpu sag Paleogene Shahejie Formation

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Present Geothermal Fields of the dongpu sag in the Bohai Bay Basin

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Acta Geologica Sinica(English Edition) 2014年第3期88卷 915-930页

作者： ZUO Yinhui QIU Nansheng HAO Qingqing ZHANG Yunxian PANG Xiongqi LI Zhongchao GAO Xia College of Energy Resources Chengdu University of Technology Research Institute of Exploration and Development Zhongyuan Oilfield SINOPEC State Key Laboratory of Petroleum Resource and Prospecting China University of Petroleum Research Center for Basin and Reservoir China University of Petroleum Institute of Mineral Resource Research China Metallurgical Geology Bureau

The dongpu sag is located in the south of the Bohai Bay basin,China,and has abundant oil and gas *** date,there has been no systematic documentation of its geothermal *** study measured the rock thermal conductivity of 324 cores from 47 wells,and calculated rock thermal conductivity for different *** geothermal gradient and terrestrial heat flow were calculated for 192 wells on basis of 892 formation-testing data from 523 *** results show that the dongpu sag is characterized by a medium-temperature geothermal field between stable and active tectonic areas,with an average geothermal gradient of 32.0℃/km and terrestrial heat flow of 65.6 mW/*** geothermal fields in the dongpu sag is significantly controlled by the Changyuan,Yellow River,and Lanliao basement *** developed in the Paleogene and the Dongying movement occurred at the Dongying Formation depositional *** geothermal fields distribution has a similar characteristic to the tectonic framework of the dongpu sag,namely two subsags,one uplift,one steep slope and one gentle *** oil and gas distribution is closely associated with the present geothermal *** work may provide constraints for reconstructing the thermal history and modeling source rock maturation evolution in the dongpu sag.

关键词： dongpu sag Bohai Bay basin present geothermal field thermal conductivity terrestrialheat flow

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