碳酸盐岩储层岩电参数影响因素及计算方法  

The Influencing Factors and Calculation Methods of Rock Electrical Parameters of Carbonate Reservoirs

作　　者：吴国海 王坤 封立香 孙俏 李永贵 杨宁 杨爰齐 孙利国 WU Guohai;WANG Kun;FENG Lixiang;SUN Qiao;LI Yonggui;YANG ning;YANG Yuanqi;SUN Liguo(China National Logging Corporation,Beijing 100101,China;Geological Research Institute,China National Logging Corporation,Xi'an,Shaanxi 710077,China;Well Logging Key Laboratory,China National Petroleum Corporation,Xi'an,Shaanxi 710077,China)

机构地区：[1]中国石油集团测井有限公司国际公司,北京100101 [2]中国石油集团测井有限公司地质研究院,陕西西安710077 [3]中国石油天然气集团有限公司测井重点实验室,陕西西安710077

出　　处：《测井技术》2024年第5期613-622,共10页Well Logging Technology

基　　金：中国石油天然气集团有限公司关键核心技术攻关项目“海外碳酸盐岩复杂油气层测井评价关键技术研究”(2021DJ3402)。

摘　　要：碳酸盐岩储层孔隙结构复杂程度远超碎屑岩储层,其岩电参数中的胶结指数m和饱和度指数n变化范围大,很难得到精确值,采用固定的岩电参数来计算储层的饱和度,无法达到精细评价要求。为了解决该问题,在对常规物性、铸体薄片、压汞曲线等资料详细分析及微观特征对比的基础上,得出储层样品分类研究的必要性,结合岩心照片特征,将储层按照孔隙空间分为基质孔隙、孔隙-裂缝、孔隙-孔洞这3种类型,总结处于孔隙度渗透率关系图及岩电关系图中不同位置所代表的储层类型,得出不同储层类型样品点的微观孔隙及渗滤特征差异。在各类孔隙类型导电特征认识的基础上,利用碳酸盐岩储层的三孔隙导电模型,分析各类孔隙类型的导电特征、孔隙特征变化及裂缝倾角变化对于m值的影响,验证了m值与储层的孔隙结构密切相关。依据样品点的储层分类,得到各类储层的岩电参数变化范围、影响因素及变化规律,并通过拟合方式得到每一种类型储层的m值,并给出m值的调整方法。在对饱和度指数n分析过程中,认识到n值与孔隙结构无关,但与储层的润湿特征密切相关,并得到n值的估算方法,为碳酸盐岩储层测井解释及饱和度的精细评价奠定基础。The pore structure of carbonate reservoir is much more complex than that of clastic reservoir,and its rock electrical parameters m and n vary widely,which is difficult to obtain accurately,and the fixed rock electrical parameters are used to calculate the saturation of the reservoir,which cannot meet the requirements of fine evaluation.In order to solve this problem,based on the detailed analysis of conventional physical properties,cast thin sections,mercury intrusion curves and other data and the comparison of microscopic characteristics,the necessity of reservoir sample classification research is obtained,combined with the characteristics of core photos,the reservoir is divided into three types according to the pore space:matrix pores,pores-fractures,and pores-pores,and the reservoir types represented by different positions in the porosity-permeability relationship diagram and rock-electricity relationship diagram are summarized,and the differences in microscopic pore characteristics and percolation characteristics of sample points of different reservoir types are obtained.On the basis of the understanding of the conductive characteristics of various pore types,the conductive characteristics of various pore types are analyzed by using the three-pore conductivity model of carbonate reservoirs,and the influence of pore characteristics and fracture inclination changes on the m value of cementation index is analyzed,which confirmed that the m value is closely related to the pore structure of the reservoir.According to the reservoir classification of the sample points,the variation range,influencing factors and variation laws of rock and electrical parameters of various reservoirs are obtained,and the m value of each type of reservoir is obtained by fitting,and the adjustment method of the m value is given.In the process of analyzing the saturation index n,it is realized that the n value has nothing to do with the pore structure,but is closely related to the wetting characteristics of the reservoir,and the estimatio

关 键 词：碳酸盐岩储层 岩电参数 影响因素 计算方法 胶结指数 饱和度 

分 类 号：P631.84[天文地球—地质矿产勘探]