基于钙质校正的砂砾岩储层岩性识别方法  

Lithologic Identification Method for Glutenite Reservoirs Based on Calcium Correction

作　　者：王英伟[1] 赵军[2] 卢海胜 李维 覃建华[1] 朱键[1] 钱根宝[1] WANG Yingwei;ZHAO Jun;LU Haisheng;LI Wei;QIN Jianhua;ZHU Jian;QIAN Genbao(Research Institute of Exploration and Development,Xinjiang Oilfield Company,CNPC,Karamay,Xinjiang 834000,China;School of Geoscience and Technology,Southwest Petroleum University,Chengdu,Sichuan 610500,China)

机构地区：[1]中国石油新疆油田公司勘探开发研究院,新疆克拉玛依834000 [2]西南石油大学地球科学与技术学院,四川成都610500

出　　处：《测井技术》2020年第4期372-376,共5页Well Logging Technology

基　　金：国家“十三五”重大专项子课题(2016ZX05002-002-009)“准噶尔盆地碎屑岩层系油气富集规律与勘探评价”。

摘　　要：X区块百口泉组砂砾岩储层常规测井资料受储层钙质含量影响而导致测井岩性识别精度低。以归位后岩心分析的钙质含量数据为基础,分析钙质含量对储层电阻率、密度值的影响。运用归一化处理分析深侧向电阻率与体积密度比值和钙质含量与孔隙度比值之间的关系,建立储层钙质含量计算模型,采用电阻率对数增大率法消除钙质含量对储层电阻率的影响;选取对岩性较为敏感的电阻率、密度、伽马等曲线,运用C4.5决策树算法建立决策树岩性识别模型,对实际资料进行判别分析。结果表明,所建立的决策树模型能够较好地识别研究区储层岩性,识别结果与岩心描述吻合度达到83%以上。Conventional logging data of glutenite reservoir in X area Baikouquan formation are influenced by calcium content,which leads to a low accuracy of lithology identification.Based on the calcium content data from core analysis,the influence of calcium content on the resistivity and the density values of the reservoir is analyzed.The relationship between the ratio of deep lateral resistivity to density and the raito of calcium content to porosity is analyzed by using normalization treatment,and a calculation model for the calcium content of the reservoir is established.The effect of calcium content on reservoir resistivity is eliminated by using resistivity logarithm increasing rate method.On this basis,curves such as resistivity,density and gamma,which are sensitive to lithology,are selected to establish the lithologic identification model of decision tree by selecting sample data and applying C4.5 decision tree algorithm.The results show that the established decision tree model can better identify the reservoir lithology in the studied area,and the agreement of the identification results and core description is more than 83%.

关 键 词：岩性识别 钙质含量 电阻率测井 密度测井 校正模型 决策树算法 

分 类 号：P631.84文献标识码:A[天文地球—地质矿产勘探]