塔北轮古东碳酸盐岩储层岩石物理响应特征  

Rock physics response characteristics of carbonate reservoir in Lungu East Tabbies district

作　　者：龚洪林[1] 刘伟方[1] 张喜梅[1] 

机构地区：[1]中国石油勘探开发研究院西北分院,兰州730020

出　　处：《地球物理学进展》2014年第1期331-338,共8页Progress in Geophysics

基　　金：中国石油天然气股份有限公司重大专项课题(2008E-0702)"海相碳酸盐岩沉积环境;岩相古地理研究与有利区带优选"资助

摘　　要：塔北轮古东地区奥陶系碳酸盐岩储层类型多,地震响应特征多样,纵横向变化大,埋藏深,储集空间复杂和控制因素多,不易有效进行酸盐岩储层预测.针对塔北轮古东碳酸盐岩储层预测难点,利用岩石物理分析、AVO模型正演、AVO属性反演和叠前联合反演等技术,开展了奥陶系碳酸盐岩储层岩石物理响应特征研究,以便指导奥陶系碳酸盐岩储层预测.研究结果表明塔北轮古东奥陶系碳酸盐岩储层岩石物理响应特征为:低纵、横波阻抗,低纵、横波速度比,低泊松比,低拉梅常数和剪切模量,低拉梅常数乘密度和剪切模量乘密度.AVO属性碳氢指示、泊松比差及流体因子绝对值大.AVO模型正演显示随偏移距增大,含气合成道集振幅变小明显,频率降低,含油、含水合成道集振幅也变小,但不明显;而对于AVO属性P*G和流体因子,含油气后绝对值变大.Ordovician carbonate reservoir in Lungu East Tabei District has various types, various seismic response characteristics, vertical and horizontal changes and buried deep. Reservoir spaces are complex and controlled by many factors that make it difficult to effectively predicting carbonate reservoir. In order to solve the problem of carbonate reservoir prediction in Lungu East TaBei District, rock physics analysis, AVO forward modeling, AVO attribute inversion and prestack joint inversion technologies were used to study rock physics response of Ordovieian carbonate reservoir. This study has great value to guide the Ordovician carbonate reservoir prediction. The results show that rock physics response of carbonate reservoir in Lungu East TaBei district has low longitudinal and transverse wave impedance, low vertical shear velocity ratio, low Poisson＇s ratio, low Lame constants and shear modulus, low Lame constant multiplied by the density and shear modulus multiplied by the density and high absolute value of The AVO attributes hydrocarbon indication, Poisson＇s ratio and fluid factor. AVO forward modeling increased with offset. The amplitude and frequency of gas synthetic gathers decrease significandy. The amplitude of oily, aqueous synthesis gathers also decrease, but not obvious, whereas the absolute value of AVO attributes P ~ G and fluid factor increase once it contains oil and gas.

关 键 词：轮古东地区 碳酸盐岩储层 岩石物理响应特征 叠前弹性参数反演 叠前AVO分析 流体因子 P*G剖面 

分 类 号：P631[天文地球—地质矿产勘探]