成像测井复杂碳酸盐岩非构造裂缝识别问题探讨  

Imaging Log Identification of Non-tectonic Fractures in Complex Carbonate Rock

作　　者：尤征 李曦宁 杜旭东 张胜斌 魏蓓蕾 You Zheng;Li Xining;Du Xudong;Zhang Shengbin;Wei Beilei

机构地区：[1]中油石油集团测井有限公司国际公司

出　　处：《国外测井技术》2024年第4期28-33,2,共7页World Well Logging Technology

摘　　要：构造裂缝因其特征明显,在成像图上较易识别,但非构造裂缝主要是在沉积和成岩过程中形成,特征不明显,在成像图上难以识别。国外某些油田碳酸盐岩地层岩类多样,岩相多变,结构和构造复杂,溶蚀、压实、压溶、白云化、黄铁矿化、胶结等成岩作用强烈,并局地伴有风化、岩溶、滑塌、碎裂、塌积、生物扰动等作用,形成大量非构造裂缝,主要以顺层缝、缝合线、收缩缝、角砾缝和溶蚀缝为主。和构造裂缝相比,非构造裂缝因其形态不规则,延伸范围有限、多较细小,不易识别且极易和不规则层面、泥质条带等其它地质特征混淆。通过精细对比成像图和岩芯照片,参考岩芯描述,结合这些非构造裂缝的成因,甄别了各类非构造裂缝,分析了其特征和识别方法,建立了非构造裂缝成像模式,以期对解决类似复杂碳酸盐岩的裂缝识别问题有所帮助。Tectonic fractures are easy to identify on the imaging log because of their obvious characteristics,but non-tectonic fractures are mainly formed in the process of sedimentation and diagenesis,and their characteristics are not obvious,so it is difficult to identify in the imaging log.The carbonate rocks in some oil fields abroad have diverse rock types,variable lithofacies,complex texture and structure,with strong diagenesis such as dissolution,compaction,pressolution,dolomitization,pyritization and cementation,and local weathering,karst,slump,fragmentation,colluviation and bioturbation.A large number of non-structural fractures are formed,which are mainly composed of bed-parallel fractures,stylolites,shrinkage fractures,breccia fractures and dissolution fractures.Compared with tectonic fractures,non-tectonic fractures are difficult to identify and easily confused with other geological features such as irregular plane and shale flaser because of their irregular shape,limited extension range and small size.Based on the detailed comparison of imaging logs and core photos,referring to the description of the core and combining with the genesis of these non-tectonic fractures,various types of non-tectonic fractures are identified,and their characteristics and identification methods are analyzed,a non-tectonic fracture imaging model is established,in order to help solve the problem of fracture identification of similar complex carbonate rocks.

关 键 词：成像测井 复杂碳酸盐岩 非构造裂缝 顺层缝 缝合线 收缩缝 风化缝 溶蚀缝 

分 类 号：TU7[建筑科学—建筑技术科学]