地震相干体技术识别低序级断层方法研究

Method study of seismic coherence cube technique to interpretation of low level faults

正确识别低序级断层对于复杂断块油藏的勘探开发有着重要的意义,低序级断层与高序级断层在成因上没有明显区别。本文在介绍地震相干原理的基础上,提出了优化的、抗干扰能力强的相干系数法,分析和总结了相关计算时窗、倾角搜索时窗、相邻计算道数等参数对相干体计算结果的影响,在曲堤油田的实际应用中,识别了一系列正断层和正滑断层成因类型的低序级断层,使得该区的构造刻划更为细致。

Correct identification of the low level faults is helpful for the exploration and development of oil and gas in complicate fault-block reservoirs. Low level faults have the same cause as high level faults, Based on the seismic coherence principle, the authors proposed the coherence algorithm with optimizing and robust to noise, and analyzed several parameters with the influence on the seismic coherence cube calculating result including correlation calculating time window, dip angle searching time window, adjacent calculating trace number, etc, A series of low-level faults were identified as downthrowing faults or slide faults in the practical application of Qudi Oilfield, which makes the structures in the studied area be depicted thoroughly.