测井技术2026，Vol.50Issue(1)：61-74,14.DOI:10.16489/j.issn.1004-1338.2026.01.006
川东北凉高山组砂-页互层型储层可压性测井评价方法
Fracturability Logging Evaluation of Sand-Shale Interlayer Reservoirs of Lianggaoshan Formation in Northeastern Sichuan Basin
摘要
Abstract
The Lianggaoshan formation sand-shale interbedded shale oil reservoirs in the Pingchang area,northeastern Sichuan basin are abundant in oil and gas resources.However,such reservoirs feature developed sand-shale interbeds,complex lithologic associations,and strong differences in interlayer rock mechanical properties and in-situ stress,making the existing fracability evaluation methods ineffective in guiding the fracturing interval selection and process design.Based on triaxial rock compression tests,Brazilian disc tests,differential strain tests and other laboratory experiments,this paper systematically analyzes the characteristics of rock mechanical properties,brittleness index,differential coefficient of two horizontal principal stresses,and equivalentizes the reservoir as a vertical transverse isotropy(VTI)medium.A fracability evaluation index tailored to the sand-shale interbedded shale oil reservoirs in the study area is established using the support vector regression algorithm,and the production performances of intervals with different fracability levels are compared.The results show that:① The elastic modulus of the Lianggaoshan formation sand-shale interbedded shale oil reservoirs in the study area ranges from 10 to 35 GPa,and the Poisson's ratio ranges from 0.14 to 0.30.Both the elastic modulus and Poisson's ratio parallel to the bedding direction are larger than those perpendicular to the bedding direction,indicating significant anisotropy.The elastic modulus and Poisson's ratio perpendicular to the bedding direction are the dominant factors affecting reservoir fracability.② Sandstone intervals with low minimum horizontal principal stress and high differential coefficient of two horizontal principal stresses,as well as sand-shale transition zones adjacent to shale intervals,exhibit superior fracability.The large differential coefficient of two horizontal principal stresses strengthens the cross-layer propagation capacity of artificial fractures,which effectively connects the sand-shale interbeds.③ High tensile strength raises the initiation pressure for reservoir stimulation,prevents fracturing fluid leakage,reduces energy loss during fracture cross-layer propagation,and keeps fractures more prone to staying open during propagation after fracturing,which is conducive to the formation of stable flow conduction channels.④ Sandstone intervals and sand-shale transition zones with high brittleness index,large differential coefficient of two horizontal principal stresses,high tensile strength and low minimum horizontal principal stress present high fracability indexes,favorable fracturing effects and high oil and gas production rates.Case verification demonstrates that the established log-based fracability evaluation method accurately characterizes the propagation potential of hydraulic fractures,and is highly consistent with the fracturing monitoring data in the post-fracturing flowback and production stage.The research results provide a basis and guidance for the design of differentiated fracturing schemes and the optimization of fracturing intervals in the development of sand-shale interbedded shale oil reservoirs.关键词
测井评价/地质力学/可压性评价/砂-页互层型页岩油储层/四川盆地/凉高山组Key words
log evaluation/geomechanical parameter/compressibility evaluation/sand-shale interlayer reservoir/Sichuan basin/Lianggaoshan formation分类
天文与地球科学引用本文复制引用
宫铭,刘岩,何建华,邓虎成,李可赛,张建良..川东北凉高山组砂-页互层型储层可压性测井评价方法[J].测井技术,2026,50(1):61-74,14.基金项目
国家自然科学基金项目"多尺度裂缝性储层中随钻方位电磁波测井响应机理研究"(42404144) （42404144）
国家科技重大专项项目"深层页岩气开发机理与开发关键技术"(2025ZD1404100) （2025ZD1404100）
国家重大专项青年科学家课题"地下水多点协同监测及迁移影响机理"(2025ZD140107) （2025ZD140107）
