川中海相碳酸盐岩层系小型走滑断裂地震识别  

Seismic Identification of Small Strike-Slip Faults in Marine Carbonate Strata in Paleouplift Area of Central Sichuan Basin

作　　者：马峰[1,2] 汪泽成 雷明[1,2] 付小东[4] 文龙 刘雄志[1,2] 李文正[4] 周刚[5] Ma Feng;Wang Zecheng;Lei Ming;Fu Xiaodong;Wen Long;Liu Xiongzhi;Li Wenzheng;Zhou Gang(PetroChina Research Institute of Petroleum Exploration&Development-Northwest,Lanzhou 730020,China;Key Laboratory of Reservoir Description,CNPC,Gansu 730020,China;Research Institute of Petroleum Exploration&Development,PetroChina,Beijing 100083,China;PetroChina Hangzhou Research Institute of Geology,Hangzhou 310023,China;Research Institute of Exploration and Development,PetroChina Southwest Oil&Gasfield Company,Chengdu 610041,China)

机构地区：[1]中国石油天然气股份有限公司勘探开发研究院西北分院,甘肃兰州730020 [2]中国石油天然气集团有限公司油藏描述重点实验室,甘肃兰州730020 [3]中国石油天然气股份有限公司勘探开发研究院,北京100083 [4]中国石油天然气股份有限公司杭州地质研究院,浙江杭州310023 [5]中国石油天然气股份有限公司西南油气田公司勘探开发研究院,四川成都610041

出　　处：《地球科学》2023年第6期2204-2220,共17页Earth Science

基　　金：“十三•五”国家油气专项(No.2017ZX05008005);中国石油天然气股份有限公司重点科技项目(No.2018A⁃0105)、基础性与前瞻性项目(No.2021DJ1503).

摘　　要：针对四川盆地川中古隆起高磨三维区震旦系-古生界二叠系海相碳酸盐岩层系不同尺度的断裂,特别是小型走滑断裂在地震资料上难以识别和解释的难点,利用地震数据及其属性携带的断裂结构信息、不连续性变化信息、裂缝带信息,优选应用构造导向滤波技术、本征值相干技术、分频相干与分方位相干技术、最大正/负曲率属性技术、蚂蚁体技术、最大似然断裂识别技术、PADD(poststack amplitude direction decomposition,叠后振幅方位分解)技术,分层系、分方位、分尺度逐级精细识别和描述了地震波同相轴错断型断裂、同相轴挠曲型断裂、裂缝型微小断裂,以及岩溶塌陷体,并应用成像测井裂缝信息定性验证不同尺度断裂方位和断裂密度,井震吻合效果好.集成形成“三分八步”逐级控制下的断裂地震识别技术方法系列.并根据地质模型和断裂模式判别了走滑断裂,进行了分级,总结了川中高磨区6种走滑断裂构造样式.Fault identification of different scales in marine carbonate rock remains a big challenge for geophysicists.In this paper,aiming at identifying and interpreting fault distribution,especially the small strike-slip faults,it presents the implementation of seismic attributes with the information of fault structure and discontinuity change in mapping the fracture zone distribution in the Sinian-Paleozoic-Permian formation,Gaomo area,Sichuan basin.Technologies such as structural steering filtering,eigenvalue coherence,frequency division coherence and azimuth division coherence,maximum positive/negative curvature attribute,ant body attribute,maximum likelihood fracture identification and PADD(poststack amplitude direction decomposition)are used to describe the faults with different layers,azimuth and scale,which are forming in the types of seismic events dislocation,deflection,micro fault and karst collapse body.Also,the imaging logging is applied to verify the fracture orientation and fracture density of different scales qualitatively and show good coincidence with the results predicted with the seismic attribute.Based on the experiment,it summarizes“three classification and eight steps”gradually controlled fault identification techniques which can distinguish the strike-slip fault of different scales effectively and constructes six types of strike-slip fault structural styles in the central uplift of Sichuan basin.

关 键 词：四川盆地 川中古隆起 海相碳酸盐岩 走滑断裂 地震识别 构造. 

分 类 号：P631.4[天文地球—地质矿产勘探]