基于双γ模型的叠前多波反演技术预测苏里格含气储层  

Prediction of Sulige gas reservoir with multi-wave pre-stack inversion based on dual γ models

作　　者：赵万金[1] 张巧凤[1] 张建新[1] 李海亮[1] 孙辉[1] 

机构地区：[1]中国石油勘探开发研究院西北分院

出　　处：《岩性油气藏》2011年第6期97-101,共5页Lithologic Reservoirs

基　　金：中国石油天然气集团公司科学研究与技术开发项目(编号:2008A-1803)"储层及流体地球物理识别技术"资助

摘　　要：鄂尔多斯盆地苏里格气田盒8段主要发育河流相储层,砂体纵向叠置、横向变化快、非均质性强,常规反演方法无法有效区分致密砂岩和含气砂岩。该文利用基于双γ模型和模拟退火的叠前多波反演方法进行储层预测。此方法利用时间走时和振幅能量计算各自纵波、横波速度比(γ)模型,然后通过模拟退火方法求取最佳γ数据体,使纵波、横波反射层位匹配最佳;在此基础上利用纵波截距、梯度及横波梯度数据直接反演纵波、横波速度等参数。模拟退火反演采用区间四分法确定临界温度,准确、稳定地对目标函数全局寻优求解。实际资料的反演证明了该方法的有效性和适用性。The He 8 member of Shihezi Formation in Sulige Gas Field of Ordos Basin mainly developed fluvial facies reservoir which is characterized by strong heterogeneity and vertically superimposed sand bodies with fast lateral variation. So, conventional inversion can not be used to distinguish the tight sand from gas-bearing sandstone effectively. The pre-stack multi-wave inversion based on dual γ model and simulated annealing was applied to carry out the reservoir prediction. The method makes use of time-travel and amplitude energy to calculate each ratio（γ） of P-wave velocity and S-wave velocity, and then estimate the best γ by simulated annealing, making the P-wave and S-wave match the best, finally, carry out the P-wave and S-wave velocity inversion with P-wave intercept, gradient and S-wave gradient. Simulate annealing method, which uses interval quartation to determine critical temperature, can be used to obtain global optimum value for object function accurately and steadily. The actual data inversion result proves the validity and applicability of this method.

关 键 词：双γ模型 模拟退火 叠前多波反演 区间四分法 苏里格气田 

分 类 号：P315.31[天文地球—地震学]