新疆塔里木盆地托甫台地区碳酸盐岩储层缝洞测井评价  

Well Logging Evaluation of Fractures and Vugs of Carbonate Reservoirs in Tuofutai Area of Tarim Basin,Xinjiang,China

作　　者：陈雨霖[1] 唐军[2] Chen Yulin;Tang Jun(College of Earth Science,Yangtze University,Wuhan Hubei 430100,China;College of Geophysics and Petroleum Resources,Yangtze University,Wuhan Hubei 430100,China)

机构地区：[1]长江大学地球科学学院,湖北武汉430100 [2]长江大学地球物理与石油资源学院,湖北武汉430100

出　　处：《工程地球物理学报》2022年第5期689-698,共10页Chinese Journal of Engineering Geophysics

基　　金：中国石油科技创新基金项目(编号:2020D-5007-0306)。

摘　　要：新疆塔里木盆地托甫台地区奥陶系地层孔隙结构的随机性导致储层非均质性较强,所以利用测井技术进行孔隙、裂缝和溶洞发育特征及组合状况的评价成为储层评价中的一个关键问题。根据岩心照片、铸体薄片等信息将碳酸盐岩有效储渗空间划分为裂缝和孔洞两大类型。按照受溶蚀及构造应力改造强度,将裂缝型储层划分为组合缝洞型和溶蚀缝洞型。此外,电阻率成像测井解释中除了利用图像定性识别孔隙类型之外,根据阿尔奇公式反演孔隙度谱也可以实现裂缝、孔洞两大类储层的识别。本研究建立了简单的孔洞—裂缝理论模型,分析了裂缝对导电效率的影响,引入裂缝孔隙度、深电阻率减小幅度等基于常规测井计算的裂缝参数,建立了基于测井特征参数组合与缝洞型以及孔洞型储层的细分图版。将平均有效孔隙度和累计孔隙有效厚度结合,针对上述储层类型分别制定了储层等级划分的测井标准,丰富了碳酸盐岩储层有效性的测井评价方法。The randomness of pore structure causes the heterogeneity of carbonate reservoir of the Ordovician strata in Tuofutai area of Tarim Basin,Xinjiang.Therefore,using well logging method to evaluate the pores,fractures,caves and their combination has become a key problem in reservoir evaluation.The effective storage and seepage space of carbonate rock is classified into two types,fractures and vugs,according to rock electron microscope scanning,casting thin sections and other information.At the same time,the fracture-type reservoirs are further divided to composite fissure-vug type and dissolution fissure-vug type.In addition to the qualitative identification of pore types,image logging can also identify fractures and pores by using the porosity spectrum inversed by Archie formula.In this study,a simplified cave-fracture theoretical model is established to analyze the effect of fractures on conductive efficiency.Then the fracture porosity,deep-resistivity reduction and other fracture parameters computed by conventional well logs are introduced,and the dividing plates of fracture-vug type and pore-vug type reservoir are constructed by the combination of well logging parameters.Combining the cumulative effective pore thickness and average effective porosity,we build well logging classification standards for the above reservoirs and enrich the well logging evaluation method of the carbonate reservoir.

关 键 词：碳酸盐岩储层 裂缝和溶洞 测井识别 分类 

分 类 号：P631.8[天文地球—地质矿产勘探]