Prediction of natural fracture in shale oil reservoir based on R/S analysis and conventional logs

Haoran XU; Wei JU; Xiaobing NIU; Shengbin FENG; Yuan YOU; Hui YANG; Sijia LIU; Wenbo LUAN

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Prediction of natural fracture in shale oil reservoir based on R/S analysis and conventional logs

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Investigation into natural fractures is extremely important for the exploration and development of low-permeability reservoirs.Previous studies have proven that abundant oil resources are present in the Upper Triassic Yanchang Formation Chang 7 oil-bearing layer of the Ordos Basin,which are accumulated in typical low-permeability shale reservoirs.Natural fractures are important storage spaces and flow pathways for shale oil.In this study,characteristics of natural fractures in the Chang 7 oil-bearing layer are first analyzed.The results indicate that most fractures are shear fractures in the Heshui region,which are characterized by high-angle,unfilled,and ENE-WSW-trending strike.Subsequently,natural fracture distributions in the Yanchang Formation Chang 7 oil-bearing layer of the study area are predicted based on the R/S analysis approach.Logs of AC,CAL,ILD,LL8,and DEN are selected and used for fracture prediction in this study,and the R(n)/S(n)curves of each log are calculated.The quadratic derivatives are calculated to identify the concave points in the R(n)/S(n)curve,indicating the location where natural fracture develops.Considering the difference in sensitivity of each log to natural fracture,gray prediction analysis is used to construct a new parameter,fracture prediction indicator K,to quantitatively predict fracture development.In addition,fracture development among different wells is compared.The results show that parameter K responds well to fracture development.Some minor errors may probably be caused by the heterogeneity of the reservoir,limitation of core range and fracture size,dip angle,filling minerals,etc.

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《地球科学前沿：英文版》 |2021年第3期|705-718|共14页
作者
Haoran XU; Wei JU; Xiaobing NIU; Shengbin FENG; Yuan YOU; Hui YANG; Sijia LIU; Wenbo LUAN;
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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;

China;

School of Resources and Geosciences;

China University of Mining and Technology;

Xuzhou 221116;

China;

School of Geosciences;

China University of Petroleum(East China);

Qingdao 266580;

China;

Institute of Exploration and Development;

PetroChina Changqing Oilfield Company;

Xi'an 710018;

China;

School of Computer Science and Technology;

China University of Mining and Technology;

Xuzhou 221116;

China;

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原文格式 PDF
正文语种 chi
中图分类矿床学;
关键词
natural fracture prediction; shale oil reservoir; R/S analysis; Chang 7 oil-bearing layer; Ordos Basin;

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Prediction of natural fracture in shale oil reservoir based on R/S analysis and conventional logs

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