摘要
工区构造复杂,断层非常发育,目标层段主要以砂泥岩薄互层为主。为研究目标层段砂体的横向展布情况与储层的有利部位,对该区进行波阻抗反演研究。由于区内复杂的断层地质条件,不利于建立与实际地质情况符合的初始模型。本文讨论了利用VSP资料得到的时深关系准确标定层位,采用加密地震解释层位的方法来控制断层断点,考虑到区内薄互层的匹配因素,适当缩短子波长度的方法来提高波阻抗反演的纵向分辨率。方法使反演结果合理反映砂泥薄互层的情况,取得了较好的应用效果。
The work area possesses complex geological structure and developed faults.The target formation is mainly composed of the thin sand-shale interbed.The study of impendence inversion is implemented to find the sand distribution within the target formation and the vantage reservoir.The complex geophysical condition of the work area is not of benefit to building the initial model which coincides with real geological case.This paper discusses how to calibrate the stratigraphic sequence by the time-depth relationships from VSP data,add the horizons for describing fault location,consider match factors of thin interbed within the work area,and reduce the length of wavelet to improve the resolution of impendence inversion.These methods can make the solution of the inversion really represent the situation of the thin interbed.The application of the methods is effective.
出处
《物探化探计算技术》
CAS
CSCD
2008年第1期52-57,91,共6页
Computing Techniques For Geophysical and Geochemical Exploration
关键词
层位标定
波阻抗反演
子波长度
纵向分辨率
砂泥薄互层
stratigraphic calibration
impendence inversion
length of wavelet
vertical resolution
thin sand-shale interbed
