基于地震层位约束的速度建模技术在普光气田的应用  

Application of Velocity Modeling Technology Based on Seismic Horizon Constraint in Puguang Gas Filed

作　　者：聂法健[1] 

机构地区：[1]中国石化中原油田分公司勘探开发研究院,河南郑州450000

出　　处：《非常规油气》2017年第2期1-7,共7页Unconventional Oil & Gas

基　　金：国家重大专项课题"深层礁滩相高含硫气藏稳产技术"(2016ZX05017001)资助

摘　　要：普光气田区内海相碳酸盐岩储层构造复杂,速度建模和偏移成像存在极大困难。本文采用基于地震层位约束的网格层析速度建模技术,通过拾取速度纵向变化明显的典型地震层位,从浅至深逐层约束网格层析反演,解决纵、横向构造变化对速度反演的影响,满足复杂构造速度反演精度,为逆时偏移提供精确的深度域速度模型。通过工区实际资料应用,该技术在普光气田实施良好,精确的深度域速度模型和逆时偏移成像的实施改善了负向构造影响的问题,对低信噪比地区构造成像有明显提升,解决了盐下构造成像畸变的问题,获得较好的成像效果。The complex underground structure of Pugang gas filed brings great difficulties to velocity modeling and imaging. This article utilized grid tomography velocity modeling technology based on seismic horizon constraint, which selected typical seismic horizons where has obviously velocity change to restrict velocity inversion from shallow to deep. Velocity modeling based on seismic horizon constraint solved velocity inversion unreliability caused by complex structural and lateral velocity change, and contributes to accurate depth velocity model which helps to improve the quality of reversion time migration. And the real data application proposed that this technology is successfully used in Pugang gas filed, accurate velocity model in depth domain and reverse time migration method improved negative structure and low SNR region imaging quality, solved imaging distortion under salt layer to obtain good im- aging results.

关 键 词：普光气田 速度建模 网格层析 地震层位约束 逆时偏移 

分 类 号：P631.4[天文地球—地质矿产勘探]