天然气勘探与开发2026，Vol.49Issue(5)：76-84,9.DOI:10.12055/gaskk.issn.1673-3177.20260031
陆相页岩气储层测井评价关键技术及其应用
Key logging evaluation technologies and their application to continental shale gas reservoirs
摘要
Abstract
To address the technical challenges posed by complex lithology of the continental shale gas reservoirs in the fifth member of the Upper Triassic Xujiahe Formation(Xu-5 Member)in the core area of the Tianfu Gasfield,central-western Sichuan Basin,and the absence of logging data such as density,a study was conducted on key logging evaluation technologies.The clay-corrected exponential formula was used to calculate the porosity.The resistivity(Rt)-acoustic transit time(AC)baseline overlap method was adopted to evaluate the total organic carbon(TOC).The density curve was reconstructed through curve fitting and calibrated with the Langmuir adsorption isotherm,to determine the gas content.The brittleness index was analyzed based on rock mineral composition.Finally,a comprehensive reservoir quality parameter(RQ)model was established,integrating porosity,TOC,and gas content as core parameters.The following results are obtained.(ⅰ)The clay-corrected exponential method effectively eliminates porosity calculation errors induced by lithological variations,achieving higher accuracy than the linear method and yielding porosity values that closely match core measurements.(ⅱ)TOC values calculated by the Rt-AC baseline overlap method are generally consistent with core measurements,effectively compensating for the insufficiency of logging data.(ⅲ)Using RQ as a quantitative evaluation index,the reservoirs are classified into three categories:Class Ⅰ(RQ≥0.75),Class Ⅱ(0.70＜RQ＜0.75),and Class Ⅲ(RQ≤0.70).(ⅳ)The application of this model in Well D interpreted 23.1 m of effective reservoirs,from which a gas production rate of 8.62×104 m3/d was yielded in subsequent fracturing testing,showing a good correlation between the reservoir classification and tested production performance.It is concluded that the established logging evaluation model exhibits high stability and reliability,and thus provides effective technical support for the exploration and evaluation of continental shale gas reservoirs in this area.关键词
四川盆地天府气田/三叠系上统须家河组/陆相页岩气/测井评价/孔隙度计算/总有机碳含量/储层综合品质Key words
Tianfu Gasfield of the Sichuan Basin/Upper Triassic Xujiahe Formation/Continental shale gas/Logging evaluation/Porosity calculation/TOC/Comprehensive reservoir quality分类
能源科技引用本文复制引用
杨强,高义兵,谢冰,贾敏,袁纯..陆相页岩气储层测井评价关键技术及其应用[J].天然气勘探与开发,2026,49(5):76-84,9.基金项目
新型油气勘探开发国家科技重大专项"四川盆地全油气系统与新领域勘探技术"(编号:2025ZD1400400),中国石油西南油气田公司2022年勘探配套研究项目"川中—川西地区致密气老井测井评价研究"[西南司计(2022)257号]. （编号:2025ZD1400400）
