地震资料面元小网格化叠前偏移  

PRE-STACK TIME MIGRATION （PSTM） OF SEISMIC DATA WITH SMALL GRID BIN

作　　者：卢福珍[1] 

机构地区：[1]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712

出　　处：《大庆石油地质与开发》2009年第3期130-133,共4页Petroleum Geology & Oilfield Development in Daqing

基　　金：国家重点基础研究发展计划（973）项目“火山岩储层及其油气藏识别与评价技术研究”（2009CB219307）.

摘　　要：大庆长垣南部油田主力油层葡萄花油层发育在三角洲前缘，储层薄、小断层发育。井间河道砂体的边界识别、连通性研究，小断层识别和延伸方向的确定是目前制约油田高效开发的主要地质问题。提出并实现了一种面元小网格化叠前时间偏移技术，以提高常规面元地震资料的空间分辨能力，用于油田开发阶段精细刻画小断层、微幅度构造、砂体边界。首先分析了小面元偏移的技术优势和理论依据，给出技术实现过程，应用于大庆长垣南部1340km^2的三维地震资料重新处理，与正常面元偏移结果相比，大幅度地提高了成果剖面的横向分辨率。在杏六东Ⅰ区块（4．6km^2）解释应用中，与原来依据钻井解释结果相比，核销2条断层、新增2条断层，2条较大断层延伸变长、走向发生变化，消除多个由钻井资料确认的孤立断点，葡一油层组反射特征横向变化合理，提高了砂体研究能力。Putaohua oil reservoirs are the major oil pay zone in the southern part of Daqing Placanticline, which is formed in the delta front, featured by thin beds and abundant minor faults. Delineation and connectivity studies of inter-well channel sand bodies, minor faults identification and striking direction determination are key geologic factors that restrain efficiency of oilfield development. A new PSTM processing approach of seismic data with small grid bin has been proposed and developed to promote the spatial resolution of seismic data with regular bin, which can be applied to accurate depiction of minor faults, microtectonics and sand body boundaries. The advantages and philosophy of the new approach have been explained and expounded as well as how this approach is fulfilled. The approach has been practiced in the re-processing of 3D seismic data covering an area of 1340m^2 in the southern part of Daqing Placanticline, the result of which has been compared with regular bin PSTM results, indicating that the horizontal resolution has been enhanced significantly. The application of the approach in the interpretation of Block Xing-6-E1 （ 4.6 km^2 ） shows that comparing with precious logging interpretation results, 2 faults are eliminated, 2 faults are newly-found, the extension range and striking direction of 2 major faults are changed and several isolated fault points previously defined by drilling data have .been erased, moreover, the horizontal reflectance signature of Pu-1 oil layer is more reasonable which means better understandings on sand bodies can be obtained.

关 键 词：网格面元 叠前偏移 空间分辨率 微幅度构造 断层 储层砂体 

分 类 号：P631.4[天文地球—地质矿产勘探]