摘要
致密砂岩气属于典型的非常规油气藏,储层具有低孔、低渗特征,有效砂岩储层薄且含气后与围岩的波阻抗差异小,地震响应弱。研究区成藏主控因素为砂岩厚度、物性及含气性,据此针对性开展地震预测的关键技术研究。首先利用测井资料纵向分辨率高及地震资料横向连续性好的优势,开展地质统计学随机模拟反演,精细雕刻砂岩分布;然后根据纯砂岩纵波阻抗与孔隙度的数学关系,开展两步法定量预测砂岩孔隙度,进而预测有利储层分布规律;最后通过岩石物理分析优选泊松比作为识别气、水的敏感弹性参数,基于保真保幅的地震资料进行叠前弹性反演,预测含气富集区。该方法在苏里格SX区块应用取得了良好的效果,有效指导了井位部署。
Tight sandstone gas is typical unconventional gas in the reservoir with low porosity and low permeability.The effective sandstone reservoir is thin and has a little difference in wave impedance from its surrounding rock after bearing gas,and its seismic response is weak.After analyzing the controlling factors including sandstone thickness,physical properties and gas-bearing property,the key technologies of seismic prediction were studied in the study area.Firstly,taking advantage of high vertical resolution of logging data and good lateral resolution of seismic data,geostatistical random simulation inversion was carried out to finely describe the sandstone distribution,then based on the mathematical relationship between the P-wave impedance and porosity of pure sandstone,two-step quantitative prediction of sandstone porosity and prediction of favorable reservoir distribution laws were carried out,and finally,based on fine petrophysical analysis,Poisson’s ratio was selected as the sensitive elastic parameter to identify gas and water,and prestack elastic inversion was carried out based on fidelity and amplitude preserved seismic data to predict rich gas areas.The application of this method in the Sulige SX block has achieved very good exploration and development effect.Based on the structural background,and comprehensive evaluation of lithology,physical properties and gas bearing property,favorable target zones were selected,and well location were deployed.
作者
汪关妹
张万福
张宏伟
刘良琼
刘贺
周赏
WANG Guanmei;ZHANG Wanfu;ZHANG Hongwei;LIU Liangqiong;LIU He;ZHOU Shang(Geological Research Center,BGP,CNPC,Zhuozhou,Hebei 072751,China)
出处
《石油地球物理勘探》
EI
CSCD
北大核心
2020年第S01期72-79,7,共9页
Oil Geophysical Prospecting
基金
中国石油科学研究与技术开发项目“物探重大技术现场试验与集成配套”子课题“井震联合油气藏描述技术完善与集成应用”(2017D-3503)资助
关键词
致密砂岩气
地震资料
孔隙度
泊松比
叠前反演
tight sandstone gas
seismic data
porosity
Poisson’s ratio
prestack inversion
