裂缝预测技术在玛湖地区页岩油勘探中的应用  

Application of fracture prediction technology in shale-oil exploration in Mahu area

作　　者：叶迪 习宇霄 程志国[1] 陈勇[1] 钦黎明 丁大伟 YE Di;XI Yuxiao;CHENG Zhiguo;CHEN Yong;QIN Liming;DING Dawei(Department of Geophysics,Research Institute of Exploration and Development,Xinjiang Oilfield Company,PetroChina,Urumqi,Xinjiang 830013,China;Research&Development Center,BGP Inc.,CNPC,Zhuozhou,Hebei 072750,China)

机构地区：[1]中国石油新疆油田分公司勘探开发研究院地球物理研究所,新疆乌鲁木齐830013 [2]东方地球物理公司物探技术研究中心,河北涿州072750

出　　处：《石油地球物理勘探》2022年第S01期177-182,15-16,共8页Oil Geophysical Prospecting

基　　金：国家油气重大专项课题“页岩油有效动用关键技术及应用”(2019E-2607)资助

摘　　要：准噶尔盆地玛湖地区二叠系风城组页岩油层发育大量天然裂缝,裂缝的发育程度决定了单井的产量,但是仅凭叠后地震资料难以准确预测裂缝尺度、发育特征和分布规律。为此,依托GeoEast系统总结出一套利用叠前、叠后资料开展地震裂缝预测的技术思路:首先,从单井出发,结合岩心、成像资料确定裂缝发育段;其次,通过叠后资料相干体、曲率属性识别一级和次级大尺度断裂,同时运用五维地震解释技术的振幅各向异性属性识别小尺度微裂缝;最后,充分结合宽方位叠前资料、叠后地震资料信息,预测裂缝密度及方向,明确了风城组页岩油层裂缝分布规律。综合预测出研究区内三个裂缝发育区,该预测结果为玛湖地区页岩油水平井部署提供了支持。A large number of natural fractures are developed in shale-oil reservoir of the Permian Fengcheng Formation in the Mahu area,Junggar Basin.The development degree of fractures determines the production of a single well.However,it is difficult to accurately predict the scale,development characteristics,and distribution law of the fractures only by post-stack seismic data.On the basis of GeoEast software,this paper studies a single well and determines fracture development sections by rock core and imaging data.In addition,making full use of wide-azimuth pre-stack and post-stack seismic data,five-dimensional seismic interpretation technology,the study identifies large-scale faults and small-scale micro-fractures,clarifies fracture distribution law,and predicts fracture strength and direction.Finally,three fracture development areas in the study area are comprehensively predicted.The fracture prediction results provide certain support for the deployment of shale-oil horizontal wells in the Mahu area.

关 键 词：玛湖地区 五维地震解释 曲率 各向异性 裂缝预测 

分 类 号：P631[天文地球—地质矿产勘探]