卡拉套走滑断层的识别标志及解释技术  

Identification marks and interpretation techniques of the Karatau strike-slip fault

作　　者：尹继全[1,2] 衣英杰[2] 盛善波 

机构地区：[1]中国地质大学(北京)能源学院,北京10083 [2]中国石油勘探开发研究院,北京10083 [3]中国石油海外勘探开发公司,北京100037

出　　处：《地球物理学进展》2015年第5期2270-2275,共6页Progress in Geophysics

基　　金：国家科技重大专项(2011ZX05029-002);中国石油重大科技项目(2013D-0901)联合资助

摘　　要：卡拉套(Karatau)走滑断层是中亚地区南图尔盖盆地的控盆断层,对盆地油气的运移、聚集和圈闭形成有重要的控制作用.走滑断层的结构识别和准确解释是研究断层相关圈闭的基础.本文利用三维地震资料,通过对走滑断层剖面地质特征的分析,识别了包括花状构造、海豚效应、丝带效应、断层两盘差异化的地层产状等走滑断层典型标志.针对走滑断裂带资料成像差的特点,采用构造导向滤波技术有效的提高了断面之间的地层连续性,突出了主干断层和羽状断层的清晰度.以构造导向滤波数据体为基础的相干体断层属性清楚的表征了走滑断裂带的平面发育特征;相干体属性和构造导向滤波数据体的融合体切片将断面属性和地层属性融合,有利于分析断块结构.卡拉套走滑断裂纵向上为双层花状构造,平面上主干断层多段式分布、分支羽状断层呈雁形排列.Karatau fault is one of the most important strike-slip faults in central Asia which controlled the formation of the South Turgay Basin as well as the migration and accumulation of the hydrocarbons generated in this basin.It is very essential to interpret the configuration of strike-slip fault for evaluation of fault-related traps.The typical marks of strike-slip faults,such as,steep fault plane,flower structure,dolphin effect,ribbon effect,have been identified in the seismic profiles.The strike-slip fault system is quite complicated.The fault system interpretation is based on 3dseismic data acquired in recent years after 2006.Firstly,the fault configuration and features were carefully researched by seismic sections one by one in order to have a geological view of the Karatau fault zone.Secondly,a structure oriented filtering process was carried out to eliminate the noise and make the fault plane clear.Also,the coherence cube was calculated on the 3D data filtered by structure-oriented filter which are very helpful to present the plane character of the faults system.The Karatau fault has two layers of flower structures,and its main fault are separated into several segments,and each segments is connected with several minor derived echelon pattern faults.

关 键 词：南图尔盖盆地 走滑断层 花状构造 构造导向滤波 相干体 融合属性 

分 类 号：P542[天文地球—构造地质学] P631[天文地球—地质学]