基于五相孔隙Xu-Payne优化模型的测井曲线组合校正及应用分析  

Combination correction method of well logs based on Xu-Payne optimized model of five-phase porosity and its application analysis

作　　者：李洋 向雪梅[1] 沈晖 丁蔚楠[2] 魏三妹 朱博华[1] LI Yang;XIANG Xue-mei;SHEN Hui;DING Wei-nan;WEI San-mei;ZHU Bo-hua(Sinopec Geophysical Research Institute,Nanjing 211103,China;Exploration and Development Research Institute of Sinopec Southwest Branch Company,Chengdu 610016,China)

机构地区：[1]中国石化石油物探技术研究院,南京211103 [2]中国石化西南油气分公司勘探开发研究院,成都610016

出　　处：《地球物理学进展》2020年第6期2159-2170,共12页Progress in Geophysics

基　　金：“十三五”国家科技重大专项专题“川西山前带潮坪相白云岩储层地震预测应用研究”(2017ZX05005-004-010)资助。

摘　　要：井眼条件常导致浅侧向曲线畸变失真,而在碳酸盐岩地层中,裂缝发育也会导致横波速度读取困难.为此,探索了一种综合利用五相孔隙Xu-Payne最小二乘优化模型和三项Greenberg-Castagna关系式的测井曲线组合校正法,首次对川西雷口坡组白云岩储层的一口重要探井进行纵波速度、密度和横波速度曲线校正,并提出曲线校正效果的"四方面评价法",即运用实验数据验证法、岩石物理诊断量板法、井径影响交会分析法和纵横波匹配分析法四种方法评价曲线校正的改进质量.结果表明,利用校正后的曲线可有效改进弹性参数对白云岩储层和气层识别的能力.通过敏感性分析,揭示了雷口坡组白云岩储层和含气层的弹性参数响应特征,优选出区分非储层和各类气层敏感性最高的纵横波速度比、泊松比、λ/μ等三个弹性参数或弹性参数组合.Borehole condition always leads to distortion of shallow lateral logs, and for carbonate formation, frature can result the difficulty of shear wave measurement. Therefore, this paper explores a well log correction method combining with Xu-Payne least square optimization model of five-phase porosity and three items of Greenberg-Castagna multiple relation. The P-wave, S-wave and density log of an important exploration well are calibrated for the first time, which is studied for the dolomite reservoir of Leikoupo Formation in Chuanxi area. Then, The "four-sided evaluation method" of well log correction effect is put forward, for example, experimental data validation, rock physical diagnostic template, cross plot analysis of diameter expansion effect, and shear wave matching analysis to evaluate the improved quality of log correction. The results show that the ability of elastic parameters to identify dolomite reservoirs and gas reservoirs can be effectively improved by using the corrected Well logs. Based on sensitivity analysis, the response characteristics of elastic parameters of dolomite reservoirs and gas reservoirs in Leikoupo Formation are revealed. At last, P-S wave velocity ratio, Poisson’s ratio and λ/μ as the most sensitive elastic parameters or combinations of elastic parameters are selected optimally to distinguish non reservoir and various gas reservoirs.

关 键 词：曲线组合校正法 Xu-Payne模型 最小二乘优化 白云岩储层 曲线校正效果评价 岩石物理诊断 敏感弹性参数 

分 类 号：P631[天文地球—地质矿产勘探]