OVT域叠前裂缝预测技术--以塔里木盆地塔中ZG地区奥陶系碳酸盐岩为例  

Fracture detection with prestack seismic data in OVT domain: A case study of the Ordovician carbonate reservoir in ZG area of Tazhong district in Tarim Basin

作　　者：党青宁[1] 崔永福[1] 陈猛[1] 赵锐锐[1] 刘伟明[2] 李勇军[1] 

机构地区：[1]中国石油塔里木油田公司勘探开发研究院,新疆库尔勒841000 [2]中国石油勘探开发研究院西北分院,甘肃兰州730020

出　　处：《物探与化探》2016年第2期398-404,共7页Geophysical and Geochemical Exploration

基　　金：塔里木油田勘探开发研究院自研课题(2015-1221)

摘　　要：以塔里木盆地塔中ZG地区全方位高密度地震资料为基础,采用叠前纵波方位各向异性技术开展基于OVT域的裂缝预测研究。OVT域地震数据偏移后保留了方位角和偏移距信息,能快速灵活地进行方位角和偏移距分选,避免了常规方法耗时冗长的弊端,很适合进行分方位裂缝预测。通过对该地区奥陶系鹰山组灰岩储层不同偏移距、不同方位角及不同域的数据体进行试验,优选出100~5 500 m偏移距和6个方位角的数据来计算纵波相对波阻抗的差异,裂缝方向和密度的预测结果与实钻吻合程度较高,能够为该井区储层缝洞连通性研究、井位部署、水平井轨迹设计提供重要依据。Based on the full azimuthal and high density seismic data in ZG area of Tazhong district in Tarim Basin,the authors detected fractures through the P-wave azimuthal anisotropy with prestack seismic data in OVT domain.After migration in OVT domain,the seismic data which possess azimuth and offset information,are suitable for fast prediction of fractures and hence avoid waste of time.The authors examined different offset ranges and azimuths and the alterable seismic domain and then chose the offset in the range of 100 ~ 5500 m and 6 azimuth to predict the fracture.To analyze the relative impendence inversion of every azimuthal datum,the authors determined the fracture orientation and fracture density of carbonate reservoirs in Yingshan Formation. The results are largely consistent with the practical drill hole and can guide the study of well deployment,connectivity of cave-fracture and design of horizontal well.

关 键 词：塔里木盆地 奥陶系碳酸盐岩 OVT域处理 方位各向异性 裂缝预测 

分 类 号：P631.4[天文地球—地质矿产勘探]