Natural fractures within unconventional reservoirs of Linxing Block,eastern Ordos Basin,central China

Wei Ju; Jian Shen; Chao Li; Kun Yu; Hui Yang

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Natural fractures within unconventional reservoirs of Linxing Block,eastern Ordos Basin,central China

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Unconventional reservoirs are generally characterized by low matrix porosity and permeability,in which natural fractures are important factors for gas production.In this study,we analyzed characteristics of natural fractures,and their influencing factors based on observations from outcrops,cores and image logs.The orientations of natural fractures were mainly in the∼N-S,WNW-ESE and NE-SW directions with relatively high fracture dip angles.Fracture densities were calculated based on fracture measurements within cores,indicating that natural fractures were not well-developed in the Benxi-Upper Shihezi Formations of Linxing Block.The majority of natural fractures were open fractures and unfilled.According to the characteristics of fracture sets and tectonic evolution of the study area,natural fractures in the Linxing Block were mainly formed in the Yanshanian and Himalayan periods.The lithology and layer thickness influenced the development of natural fractures,and more natural fractures were generated in carbonate rocks and thin layers in the study area.In addition,in the Linxing Block,natural fractures with∼N-S-trending strikes contributed little to the overall subsurface fluid flow under the present-day stress state.These study results provide a geological basis for gas exploration and development in the Linxing unconventional reservoirs of Ordos Basin.

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《地球科学前沿：英文版》 |2020年第4期|P.770-782|共13页
作者
Wei Ju; Jian Shen; Chao Li; Kun Yu; Hui Yang;
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作者单位

Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process Ministry of Education China University of Mining and Technology Xuzhou 221008 ChinaSchool of Resources and Geosciences China University of Mining and Technology Xuzhou 221116 China;

Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process Ministry of Education China University of Mining and Technology Xuzhou 221008 ChinaSchool of Resources and Geosciences China University of Mining and Technology Xuzhou 221116 China;

School of Resources and Geosciences China University of Mining and Technology Xuzhou 221116 China;

Key Laboratory of Computational Geodynamics College of Earth and Planetary Sciences University of Chinese Academy of Sciences Beijing 100049 China;

School of Resources and Geosciences China University of Mining and Technology Xuzhou 221116 China;

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正文语种 chi
中图分类骨科学（运动系疾病、矫形外科学）;
关键词
natural fracture; unconventional reservoir; Linxing region; influencing factors; Ordos Basin;

机译：自然骨折;非传统水库;林兴地区;影响因素;鄂尔多斯盆地;

Natural fractures within unconventional reservoirs of Linxing Block,eastern Ordos Basin,central China

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