天然气勘探与开发2025，Vol.48Issue(6)：54-63,10.DOI:10.12055/gaskk.issn.1673-3177.2025.06.005
川中茅口组硅质岩测井识别及矿物组分含量定量计算方法
Logging identification and quantitative calculation of mineral comoposition contents for siliceous rocks in Maokou Formation,central Sichuan Basin
摘要
Abstract
The widespread siliceous rocks in the Middle Permian Maokou Formation,central Sichuan Basin,lead to the complexity of reservoir logging responses and the limited adaptability of traditional three-porosity logs to siliceous rock identification and quantitative calculation of reservoir property parameters.It is necessary to address these challenges to achieve the fine characterization of lithology profile and the accurate calculation of physical property parameters,thereby supporting the evaluation for hydrocarbon exploration.The qualitative logging identification chart and optimization-theory-based quantitative calculation methods for siliceous rocks are discussed,based on geological and logging response characteristic analyses.The results are obtained in three aspects.(i)The P-wave to S-wave velocity ratio(Vp/Vs)is an effective indicator for identifying quartz(silica).Its value is correlated to the silica content calculated from lithology scanning logs,with a correlation coefficient up to 0.87,enabling an improved calculation accuracy of mineral composition contents.(ii)Based on acoustic,neutron and density logging results,the Vp/Vs curve is incorporated into an optimization model with constraints to accurately determine the contents of various minerals such as quartz,dolomite,calcite,and mud,compensating the technical limitation due to the lack of lithology scanning logging data.(iii)Through the precise identification and parameter quantitative calculation for siliceous rocks,coupling with the electrical imaging logging data,effective reservoirs can be clarified,avoiding any misinterpretation for tight reservoirs with high sonic transit time,low density,medium-high resistivity but high silica content as effective ones,thereby guiding logging processing and interpretation.In conclusion,the optimization calculation method integrating Vp/Vs provides an available tool for qualitative identification and quantitative parameter calculation of the siliceous rocks in the Maokou Formation.The research findings provide technical supports for logging interpretation and evaluation and seismic prediction of reservoirs in the area.关键词
四川盆地中部地区/二叠系中统茅口组/硅质岩/纵横波速度比/最优化计算/矿物组分含量/测井解释评价Key words
Central Sichuan Basin/Middle Permian Maokou Formation/Siliceous rock/Vp/Vs/Optimization calculation/Mineral composition content/Logging interpretation and evaluation分类
能源科技引用本文复制引用
黄宏,贺洪举,余广艺,赵艾琳,姜艳玲,李灿,郑小川,韩红林..川中茅口组硅质岩测井识别及矿物组分含量定量计算方法[J].天然气勘探与开发,2025,48(6):54-63,10.基金项目
中国石油天然气股份有限公司重大科技专项"复杂碳酸盐岩地球物理评价关键技术研究"(编号:2023ZZ16YJ04). （编号:2023ZZ16YJ04）
