松辽盆地大情字井地区砂–页复合储层可压性评价

doi:10.13722/j.cnki.jrme.2023.1223

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Abstract The evaluation of reservoir fracturability is an effective method to characterize the difficulty of reservoir effective reconstruction and to judge the“sweet spots”for fracturing. However，the current domestic and foreign evaluation methods for reservoir fracturability do not fully consider the multi-lithology combination stratification. This article takes the sand-shale interbedded reservoir of Qingshankou Formation in Daqingzi area of Songliao Basin as the research object，and carries out X-ray diffraction and mechanical experiments on sandstone and shale at different depths. A new brittleness evaluation method based on the energy evolution and different stages of brittleness sensitivity index in the stress-strain curve is established through fuzzy analytic hierarchy process. The brittleness index of composite rock is analyzed and quantitatively evaluated，and the brittleness index of composite rock is combined with mineral content and cohesive strength to establish a fracturability evaluation system for multi-lithology composite reservoir. Experimental evaluation results show that the uniaxial and triaxial compressive strength of composite rock samples decrease with the decrease of shale interbed thickness，but the brittleness index first decreases and then increases with the decrease of shale interbed thickness，and the fracturability index decreases with the increase of confining pressure. By conducting continuous coring，mechanical experiments and mineral content tests，the curve of fracturability index changing with burial depth is plotted，and the results of on-site microseismic monitoring are compared with the corresponding burial depth reservoir fracturability index，which validates the accuracy and feasibility of this fracturability evaluation method. The research results can provide reference for fracturing transformation of multi-lithology composite layered reservoirs.

Key words： rock mechanics multi-lithologic reservoir brittleness evaluation fracability evaluation composite rock fuzzy analytic hierarchy process

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	Articles by authors
	SUO Yu1
	2
	3
	4
	SU Xianheng1
	HE Wenyuan5
	FU Xiaofei1
	PAN Zhejun1

Cite this article:

SUO Yu1,2,3, et al. Fracability evaluation of sandstone-shale interbedded reservoir in Daqingzijing area，Songliao Basin[J]. , 2024, 43(9): 2140-2151.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2023.1223 OR https://rockmech.whrsm.ac.cn/EN/Y2024/V43/I9/2140

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