含气饱和度半定量预测方法探讨与应用  

Discussion and application of semi-quantitative prediction of gas saturation

作　　者：贺芙邦[1,2] 游俊 邵龙义[1] 

机构地区：[1]中国矿业大学(北京),北京100083 [2]北京阳光杰科科技股份有限公司,北京100192

出　　处：《地球物理学进展》2016年第2期662-667,共6页Progress in Geophysics

基　　金：国家自然科学基金项目(41572090)资助

摘　　要：勘探实践中,与水和油相比,地层岩石孔隙中含气引起的地球物理响应特征更加明显,因此利用各种地震弹性参数较容易判定和识别地层中是否含气.然而这种含气性的判别多是定性的,含气饱和度的半定量化预测一直是个挑战.利用岩心分析、测井和测试资料,从岩石物理模拟与诊断出发,结合Gassmann流体替换理论,分别研究含气砂岩和含气饱和度的敏感弹性参数,建立相应的岩石物理解释图版.在此基础上,通过地震叠前弹性反演技术分含气砂岩和高饱和度含气砂岩两步法递进式实现含气饱和度的半定量预测,取得了较好的应用效果.实例研究表明,在一定地质条件下,这种两步法递进式半定量预测砂岩含气饱和度的方法行之有效,实际生产中可操作性强,具有一定借鉴意义.Contrasted to water and oil, it is known that gas presence in formation can induce more visible geophysical signatures,which can be used to infer easily if there is gas-bearing in the subsurface or not. However,those gas-bearing inferences are mostly qualitative, and quantitative estimation of gas saturation remains a pending challenge in oil and gas industry. A two-step method for gas saturation semi-quantitative estimation is proposed.Combined with Gassmann fluid substitution theory and using data of core analysis,well logging and testing,this method begins with seismic rock physics forward modeling and diagnosis to investigate the sensitive elastic parameters for gas-bearing sand and gas saturation,respectively. Then the rock physics template（ RPT）may be built. Finally, with the guide of rock physics analysis results,the specific sensitive elastic parameters can be inverted for outlining the distributions of gas-bearing sand and high saturation sand sequentially using seismic pre-stack simultaneous inversion technique. The case study result shows that this two-step gas saturation semi-quantitative estimation method is valid,especially workable in routine research project, for the project geological condition and could be introduced to other areas that have the similar geological background.

关 键 词：含气饱和度 岩石物理 流体替换 敏感参数 叠前弹性反演 半定量预测 

分 类 号：P631[天文地球—地质矿产勘探]