利用全波属性参数识别川西深层致密气藏  

Identification of deep tight gas reservoirs in western Sichuan Depression by full-wave attributes

作　　者：徐天吉[1,2] 程冰洁[1,3] 蔡希源[4] 唐建明[2] 

机构地区：[1]成都理工大学油气藏地质及开发工程国家重点实验室,四川成都610059 [2]中国石化西南油气分公司勘探开发研究院德阳分院,四川德阳618000 [3]成都理工大学地球物理学院,四川成都610059 [4]中国石油化工股份有限公司,北京100728

出　　处：《石油地球物理勘探》2011年第5期749-756,836+663-664,共8页Oil Geophysical Prospecting

基　　金：国家科技重大专项(2008ZX05002-004-003);中国石化科研项目(P09076)联合资助

摘　　要：四川新场地区须家河组气藏构造复杂、储层埋深大(约5000m)、物性差、非均质性和隐蔽性强,气藏存在纵波"杂乱弱反射"、横波连续强反射,纵、横波均为"杂乱弱反射"和纵、横波都为连续反射等地震响应特征。本文基于四川新场地区三维三分量地震资料,采用吸收及速度发散分析,双相介质吸收预测,多尺度吸收属性提取,频变特性分析,弹性阻抗系数反演,纵、横波叠前联合反演,纵、横波叠后联合反演等技术,开展了全波属性研究。全波属性含气性检测方法综合利用了纵、横波属性及纵、横波联合直接计算与间接衍生的多波属性,基于全波敏感性分析、多体交会解释,充分地发挥了全波属性信息量大、地质信息丰富的优势,可为隐蔽性强、常规方法难以奏效的非常规油气藏预测提供新的思路。Gas reservoirs in Xinchang Gas field,Western Sichuan Depression have some tough geologic conditions with complex structure,deep burying(about 5000m),strong anisotropy and strong concealment.For seismic response,sometimes P wave reflection is disordered and weak,and sometimes both P wave and S wave reflection are disordered and weak.Thank to 3D3C seismic data in the area,we utilize full-wave attributes to identify deep tight gas reservoirs by using some techniques including analysis of absorption and velocity dispersion,absorption prediction of tow-phase media,extraction of multi-scale absorption,analysis of frequency-dependent characters,elastic impedance coefficient inversion,pre-stack P and S wave joint inversion,post-stack P and S wave joint inversion.Full-wave attributes gas detection are carried out by P and S wave attributes and multi-wave attributes.With the help of interactive interpretation of multi-data and more geophysical and geological information,this technique provides a new way for unconventional gas reservoir detection.

关 键 词：川西 全波属性 深层致密储层 含气性识别 

分 类 号：P631[天文地球—地质矿产勘探]