论文详情

高密度地震勘探技术在莺歌海盆地M气田岩性勘探中的应用

石油物探

2019年 58卷第No. 4期

阅读：89

Title

Application of high-density seismic acquisition technology for lithological exploration of M gas field in the Yinggehai Basin

单位

1.中海石油(中国)有限公司湛江分公司,广东湛江524057;2.中海油服物探技术研究所,广东湛江524057

Organization

1.Research Institute of Zhanjiang Branch Company,CNOOC,Zhanjiang 524057,China;2.Research Institute of China Oilfield Services Limited,Zhanjiang 524057,China

摘要

莺歌海盆地东方区M气田高温高压岩性气藏为非经典坡折带重力流沉积体系,砂体展布及接触关系复杂;由于该气藏埋深较大,常规地震采集资料分辨率低,因而砂体边界的准确刻画困难。为提高M气田油藏描述精度,探索海上高密度地震采集技术的应用效果,采用波动方程有限差分法对研究区地质模型进行三维地震正演模拟,论证了高密度地震采集相对于常规地震采集在刻画地下砂体展布方面的优势。实际生产中通过缩小缆间距采集了高密度地震资料,同时,利用新的多次波压制思路及方法、四维空间插值规则化技术及精细的地震速度分析技术,对采集的高密度地震资料进行了针对性高分辨率处理,提高了成果资料的地震分辨率,使得砂体接触关系更加清晰可靠。

Abstract

The high temperature and high pressure lithological gas reservoir of Dongfang District in Yinggehai Basin is a nonclassical slop break belt system of gravity flow deposit,where the distribution and contact relationship of sand bodies are very complicated.Due to the large buried depth of gas reservoirs,the resolution of conventional seismic acquisition data is low,which restricts the characterization of sand bodies.Taking the M gas field in Yinggehai Basin as an example,this paper presented the superiority of high-density seismic acquisition technology over conventional seismic acquisition.First,3D wave equation finite difference was used to model the geological features of the study area.Then,high-density seismic data was collected by reducing the cable spacing.Next,high-resolution processing was carried out,such as novel multiples suppression method,four-dimensional spatial interpolation regularization,and the fine seismic velocity analysis,which characterized the contact relationship of sand bodies more clearly.

关键词：

莺歌海盆地; 高密度地震采集; 高分辨率; 砂体接触关系; 正演模拟; 岩性勘探;

Keywords:

Yinggehai Basin,; high-density seismic acquisition,high resolution,; contact relationship of sand body,; forward modeling,; lithological exploration;

基金项目

国家科技重大专项(2016ZX05024-005)资助。

DOI

10.3969/j.issn.1000-1441.2019.04.014