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转换波地震勘探技术在四川盆地震旦系储层预测中的应用
Application of converted wave seismic exploration technology in the prediction of Sinian reservoir in the Sichuan Basin
杨海涛1,2,3 赵 岩4 曹琳昱1 王鸿燕1 王 静1 王 栋1
点击:136次 下载:17次
DOI:10.12055/gaskk.issn.1673-3177.2017.03.009
作者单位:1.中国石油川庆钻探工程公司地球物理勘探公司 2.成都理工大学 3.中国石油山地地震技术试验基地 4.中国石油西气东输管道公司
中文关键字:四川盆地 晚震旦纪 转换波 静校正 高分辨 各向异性 多波储层预测
英文关键字:Sichuan Basin; Sinian; Converted wave static correction; High resolution; Anisotropy; Multiwave; Reservoir prediction
中文摘要:

 四川盆地川中地区震旦系灯影组地质背景复杂,储层具有较强非均质性,导致其反射特征多变;并存在低速硅质白云岩,其纵波阻抗与储层接近,利用单一纵波无法准确区分硅质白云岩与储层。因此储层预测难度较大。而多波技术在储层预测、流体识别、裂缝检测方面都具有独特优势。因此在纵波处理的基础上,针对该区转换波资料处理的难点,采用了改进的转换波静校正技术、转换波高分辨处理技术和转换波各项异性叠前时间偏移等关键技术,解决了该区转换波深层成像问题,获得了高质量的转换波地震资料;同时通过多波的层位标定和层位匹配,消除了纵波和转换波的旅行时差,将转换波压缩至纵波时间域,二者波组对应关系较好,结合测井数据的统计和实际纵波和转换波剖面的对比分析,利用横波阻抗能够有效区分低速的硅质云岩和储层,提高了该区储层预测的精度。




英文摘要:The Sinian Dengying Formation in central Sichuan Basin is geologically complex and its reservoir is of strong heterogeneity, so its reflection characteristic is diverse. Besides, there is low-velocity siliceous dolomite whose P-wave impedance is close to that of the reservoir, so siliceous dolomite and reservoir cannot be distinguished only by using the P-wave impedance. These situations bring challenges to the reservoir prediction. The multiwave technology is particularly advantageous in terms of reservoir prediction, fluid identification and fracture detection. In this paper, a series of key technologies (e.g. converted wave static correction technology, converted wave high resolution processing technology, and converted wave anisotropy pre-stack time migration technology) were adopted to deal with the difficulties of converted wave data processing in this area. Based on P-wave processing, and by using the key technologies, deep layer imaging of converted wave in this area is achieved, and high-quality seismic data of converted wave is obtained. By virtue of multiwave horizon calibration and matching, the travel time difference between P-wave and converted wave is eliminated. Converted wave is compressed in the time domain of P-wave, and both wave groups are in good corresponding relationship. According to the statistics of well logging data and the profile comparison between actual P-wave and converted wave, S-wave impedance is effective to distinguish the siliceous dolomite from the reservoir and conducive to improve the reservoir prediction accuracy.
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国内统一连续出版物号:CN51-1159/TE |国内发行代码: |国际标准出版物号:ISSN1673-3177 |国际发行代码:
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