碎屑岩泥质分布形式的测井评价研究进展  

Advances in logging evaluation of shale distribution in clastic rocks

作　　者：程超[1] 张亮[1] 李培彦 高妍 叶榆 梁玉楠 曾远芳 李明军 CHENG Chao;ZHANG Liang;LI PeiYan;GAO Yan;YE Yu;LIANG YuNan;ZENG YuanFang;LI MingJun(Southwest Petroleum University,Chengdu 610500,China;Zhanjiang Branch of China National Offshore Oil Corporation,Zhanjiang 524057,China)

机构地区：[1]西南石油大学,成都610500 [2]中海石油有限公司湛江分公司,湛江524057

出　　处：《地球物理学进展》2021年第3期1052-1061,共10页Progress in Geophysics

基　　金：国家自然科学基金(面上项目)“微纳米孔致密岩石导电介电机理及全谱探测理论研究”(60335899)资助。

摘　　要：泥质含量是分析碎屑岩地层沉积环境的重要指标,也是储层测井评价的关键参数,更是岩性和物性精细解释的基础.目前在泥质的测井响应特征认识和泥质含量参数精准计算方法上取得了大量的研究成果,但对于泥质分布形式的研究还不够完善.为了探寻计算泥质分布形式的有效方法,本文通过广泛调研,系统讨论了泥质分布形式与储层参数间的关系.其中不同分布形式泥质对包括孔隙度、渗透率、含水饱和度及束缚水饱和度在内的储层参数造成的影响主要表现在以下几个方面:层状泥质使有效孔隙度降低;结构泥质对有效孔隙度、渗透率影响不大;分散泥质使效孔隙度减小,渗透率变差,束缚水饱和度增加.随后深入分析了不同泥质分布形式对常规测井曲线的影响,其中分散泥质与结构泥质在伽马测井及自然电位测井曲线上表现出明显的特征.并初步探索了在包括电成像测井及核磁共振测井的特殊测井上响应特征;归纳总结了现有的泥质分布形式的计算方法,并对现有计算方法的适用性及优缺点进行了对比分析,最后利用Thomas Stieber交会图优化分析法在南海某油田低阻储层进行了应用并得到了良好的效果.Shale content is not only an important index for analyzing the sedimentary environment of clastic strata, but also a key parameter for well logging evaluation of reservoir, and also the basis for fine interpretation of lithology and physical properties. At present, a lot of research achievements have been made in the understanding of logging response characteristics and the accurate calculation method of mud content parameters, but the research on the distribution form of mud is not perfect. In order to find an effective method to calculate the distribution form of shale, this paper systematically discusses the relationship between the distribution form of shale and reservoir parameters through extensive investigation. The influences of different distribution forms of sludge on reservoir parameters, including porosity, permeability, water saturation and bound water saturation, are mainly manifested in the following aspects: The stratified argility reduces the effective porosity. The structure mud has little influence on the effective porosity and permeability. Dispersing the argility reduces the effective porosity, deteriorates the permeability and increases the bound water saturation. Then, the influence of different types of shale distribution on conventional logging curves is analyzed in depth. The dispersed and structural clays have obvious characteristics in gamma logging and spontaneous potential logging. The response characteristics of special logs including electrical imaging log and nuclear magnetic resonance log are preliminarily explored. The existing methods for calculating the distribution of clay are summarized. The applicability and advantages and disadvantages of the existing calculation methods are compared and analyzed. Finally, the optimization method of Thomas Stieber cross plot is applied to a low-resistivity reservoir in the South China Sea oilfield and good results are obtained.

关 键 词：泥质含量 储层测井评价 泥质分布形式 影响因素 测井响应特征 

分 类 号：P631[天文地球—地质矿产勘探]