天然气勘探与开发2025，Vol.48Issue(3)：64-75,12.DOI:10.12055/gaskk.issn.1673-3177.2025.03.007
深层页岩气储层杨氏模量、泊松比定量评价
Quantitative evaluation of Young's modulus and Poisson's ratio for deep shale gas reservoirs
摘要
Abstract
Young's modulus and Poisson's ratio are the key parameters that need to be considered in fracturing stimulation of deep shale gas reservoirs.To accurately predict the two parameters,a rock mechanics parameter prediction model was established for the deep shale gas reservoirs of the Upper Ordovician Wufeng Formation and the first member of the Lower Silurian Longmaxi Formation(hereafter referred to as Long 1 Member)in the Lintanchang area,southeastern Sichuan Basin,based on the results of triaxial compressive strength test,and through the Gaussian Process Regression(GPR)method.The Young's modulus and Poisson's ratio obtained from this model were quantitatively evaluated.The research results indicate that,(i)due to the influence of internal stress weak surfaces,the stress-strain curves of deep shale samples exhibit more obvious post-peak fluctuations as temperature and pressure increase;(ii)with relatively short training time and fast prediction speed,the GPR model can mitigate the impact of"vertical anisotropy and transverse isotropy"in shale reservoirs,resulting in all residual distributions exhibiting an approximately symmetric isosceles triangluar pattern;both the prediction accuracy of rock mechanics parameters(Young's modulus and Poisson's ratio)and the confidence level of GPR model exceed 90%,achieving significantly improved prediction precision;and(iii)the predicted curves of single-well rock mechanics parameters(Young's modulus and Poisson's ratio)fit well with the results of rock mechanics test,truly reflecting the rock mechanics properties of deep shale reservoirs in the Wufeng Formation-Long 1 Member.It is concluded that the bottom of layer ③ and layer ② in the Wufeng Formation-Long 1 Member have strong brittleness characteristics and favorable engineering stimulation conditions,making them the primary intervals for future development of deep shale gas in this area.关键词
四川盆地东南部/奥陶系上统五峰组—志留系下统龙马溪组/深层页岩储层/岩石力学参数/杨氏模量/泊松比/高斯过程回归(GPR)Key words
Southeastern Sichuan Basin/Upper Ordovician Wufeng Formation-Lower Silurian Longmaxi Formation/Deep shale reservoir/Rock mechanics parameter/Young's modulus/Poisson's ratio/Gaussian Process Regression引用本文复制引用
冯少柯,熊亮,董晓霞,魏力民..深层页岩气储层杨氏模量、泊松比定量评价[J].天然气勘探与开发,2025,48(3):64-75,12.基金项目
中国石油化工股份有限公司科技攻关项目(编号:P21042-1). （编号:P21042-1）
