基于地层元素测井的鄂西宜昌地区下寒武统水井沱组页岩储层参数评价  

The evaluation for parameters of shale reservoir within the Lower Cambrian Shuijingtuo Formation in the Yichang area of the western Hubei based on the stratigraphic element logging

作　　者：童广勤 陈林 李培军 秦维秉 韩晓影 苗凤彬 TONG Guang-qin;CHEN Lin;LI Pei-jun;QIN Wei-bing;HAN Xiao-ying;MIAO Feng-bin(Hubei Key Laboratory of Operation Safety of High Dam and Large Reservoir,Yichang Hubei 443133,China;River Basin Hub Operation Management Center,China Three Gorges Corporation,Yichang Hubei 443133,China;Wuhan Center,China Geological Survey(Central South China Innovation Center for Geosciences),Wuhan 430205,China;Technology Innovation Center for Shale Oil and Gas Accumulation Theory and Engineering in Southern Complex Structural Area,China Geological Survey,Wuhan Hubei 430205,China;Shale Gas Research Center for Southern Complex Structural Area,China Geological Survey,Wuhan Hubei 430205,China;College of Mining Engineering,North China University of Science and Technology,Tangshan Hebei 063210,China)

机构地区：[1]高坝大库运行安全湖北省重点实验室,湖北宜昌443133 [2]中国长江三峡集团有限公司流域枢纽运行管理中心,湖北宜昌443133 [3]中国地质调查局武汉地质调查中心(中南地质科技创新中心),武汉430205 [4]南方复杂构造区页岩油气成藏理论与工程技术创新中心,武汉430205 [5]南方复杂构造区页岩气研究中心,武汉430205 [6]华北理工大学矿业工程学院,河北唐山063210

出　　处：《矿物岩石地球化学通报》2024年第3期553-562,共10页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：中国长江三峡集团有限公司科技计划项目(0799276);湖北省自然科学基金资助项目(2021CFB293);国家自然科学基金资助项目(42302134);中国地质调查局武汉地质调查中心潜龙计划青年人才项目(QL2022-04)。

摘　　要：鄂西宜昌地区下寒武统水井沱组页岩是近年来我国南方页岩气勘探的重点层位之一。为解决实验室储层测试资料相对有限的约束,本研究基于地层元素测井资料建立一套鄂西宜昌地区下寒武统水井沱组页岩储层参数解释方法,进而为储层评价提供依据。基于地层元素测井数据和实验室测试X射线衍射数据,建立了储层矿物组分类型及含量元素测井解释模型,误差性分析结果显示解释的岩石矿物含量与岩心测试矿物含量具有良好的相关性(黏土矿物R为0.7813,碳酸盐矿物R为0.7859,硅质矿物R为0.738),利用元素开展的矿物含量解释具有较高的准确度。基于矿物组分解释开展了水井沱组岩相类型划分,总体上岩相组合变化与相对海平面变化具有良好相关性,高灰质含量页岩类型对应于水体相对较浅环境。利用矿物组分解释模型,建立水井沱组页岩脆性矿物组分指数计算方法,对水井沱组页岩脆性进行了综合评价,结果与页岩弹性参数脆性评价结果具有良好一致性。总体上基于地层元素测井解释的矿物组分结果可为鄂西宜昌地区下寒武统水井沱组页岩储层岩相划分、储层甜点识别、压裂段优选等提供参照,对区域内储层评价与勘探开发具有良好指导意义。The shale of the Lower Cambrian Shuijingtuo Formation in the Yichang area of the western Hubei is one of key layers for the shale gas exploration in South China in recent years.In order to solve the constraint of relatively limited laboratory testing data of the shale reservoir,in this study,we have established a set of methods for interpreting parameters of the shale reservoir in the Lower Cambrian Shuijingtuo Formation in the Yichang area of the western Hubei based on the stratigraphic element logging data,thereby to provide a basis for the reservoir evaluation.Based on stratigraphic element logging data and laboratory testing X-ray diffraction data,we have established an interpretation model of the stratigraphic element logging data for classifying mineral composition types and contents of the reservoir.The deviation analysis results show that there are good correlations between interpreted mineral contents of the rock and tested mineral contents of the core(with R of 0.7813 for clay minerals,R of 0.7859 for carbonate minerals,and R of 0.738 for siliceous minerals).The interpreted mineral content by using the stratigraphic element logging data has relatively high accuracy.Based on the interpretation of mineral compositions,the classification of types of lithofacies in the Shuijingtuo Formation has been carried out.Overall,there is a good correlation between the change of lithofacies associations and that of relative sea level.The type of shale with high carbonate content was formed in a relatively shallow water environment.Using the interpretation model of mineral compositions,we have established a method for calculating the brittle mineral component index of shale in the Shuijingtuo Formation,and have comprehensively evaluated the brittleness of shale in the Shuijingtuo Formation.The comprehensively evaluated results are consistent with the evaluation results of shale brittleness by using elastic parameters.Overall,the interpreted mineral composition results based on the stratigraphic element logging interpre

关 键 词：页岩储层 元素俘获能谱测井 储层评价 宜昌地区 

分 类 号：P534.41[天文地球—古生物学与地层学]