基于叠前弹性反演的含气储层预测技术  

Gas-bearing prediction of reservoirs based on pre-stack elastic inversion

作　　者：王开燕[1,2,3,4] 林雨佳[1,2,3,4] 黄明威[1,2,3,4] 肖增佳 庞思宇 高宇航[1,2,3,4] 张辉 

机构地区：[1]东北石油大学地球科学学院 [2]非常规油气成藏与开发省部共建国家重点实验室培育基地 [3]黑龙江省油气藏形成机理与资源评价重点实验室 [4]黑龙江省普通高等学校油气藏形成机理与资源评价重点实验室,大庆163318 [5]大庆油田钻探工程公司物探一公司,大庆163357

出　　处：《地球物理学进展》2016年第5期2150-2159,共10页Progress in Geophysics

基　　金：国家杰出青年基金(41125015);国家自然基金(41474040);黑龙江省教育厅科学技术研究基金项目(12511018)共同资助

摘　　要：叠前弹性反演是目前岩性气藏储层预测的主要技术,仅仅使用纵波阻抗反演预测储层在理论和准确性方面都存在着一些不足,反演的多解性更是其致命的缺陷.本文从横波测井资料不同岩性、流体的岩石物理参数分析入手,优选能够区分岩性和流体的最佳敏感弹性参数,通过叠前反演获得反映储层岩性和含气性的弹性参数体,最后进行地震弹性参数交汇解释预测储层和识别流体.将纵向分辨率较高的测井岩石物理参数分析和横向分辨率较高的地震叠前反演结合起来,应用多个弹性参数,明显提高了储层预测的精度.地震数据中的AVO信息得到了充分的应用,采用纵波独立变量求解Zoeppritz方程.为有效储层预测和流体识别探索出了新途径.在靶区利用叠前弹性纵横波速比的属性,刻画出五级层序单砂体,在此基础上确定建议的水平井井位及其轨迹,通过叠前弹性反演比P波数据独立反演钻井成功率提高了10%以上.The pre-stack elastic inversion is a current major technology of lithologic gas reservoirs prediction, but there are some deficiencies only using the P-wave impedance inversion reservoir prediction both in theory and accuracy, the multiplicity of inversion is even more a fatal flaw. In this paper, from the analysis of the different lithology and different petrophysic parameters of the fluid, which comes from the shear wave logging data, optimizing the best sensitive elastic parameters which preferably able to distinguish the lithology and fluid, and obtaining the elastic parameters which reflect the physical properties and gas-beating through the pre-stack inversion. Finally, using the seismic elastic parameters intersection to make the interpretation of reservoir storage and fluid identification. Combining the higher vertical resolution of logging petrophysic parameters analysis and a higher lateral resolution of seismic pre-stack inversion, and applying a plurality of elastic parameters, significantly improve the precision of reservoir prediction. The AVO information of seismic data has been fully applied, using the longitudinal wave independent variables to solve the Zoeppritz equation. Explore a new way for the effective reservoir prediction and fluid identification. Using the attribute of pre-stack elastic P-wave and S-wave velocity ratio in the target area, to depict a single sand body of fifth-order sequence, and determine on the basis of the proposed horizontal well location and trajectory, the improving of drilling success rate of by pre-stack elastic inversion is than lhat of inversion of P-wave data independent inversion over 10%.

关 键 词：叠前弹性反演 含气储层 敏感弹性参数 纵横波速比 水平井井位 

分 类 号：P631[天文地球—地质矿产勘探]