基于叠前弹性反演的含气储层预测技术

发布时间：2018-04-18 10:42

本文选题：叠前弹性反演 + 含气储层　；参考：《地球物理学进展》2016年05期

【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.
[Abstract]:Prestack elastic inversion is the main technique of reservoir prediction in lithologic gas reservoirs at present. Only using P-wave impedance inversion to predict reservoir has some shortcomings in theory and accuracy, and the multiple solution of inversion is even more fatal.Based on the analysis of different lithology and petrophysical parameters of fluid in shear wave logging data, the optimum sensitive elastic parameters can be selected to distinguish lithology from fluid, and elastic parameter bodies reflecting reservoir lithology and gas-bearing property can be obtained by pre-stack inversion.Finally, seismic elastic parameter intersection interpretation is used to predict reservoir and identify fluid.Combining the analysis of log rock physical parameters with high vertical resolution and seismic prestack inversion with high lateral resolution, the accuracy of reservoir prediction is obviously improved by using multiple elastic parameters.The AVO information in seismic data has been fully applied to solve the Zoeppritz equation by using P-wave independent variables.A new approach is explored for effective reservoir prediction and fluid identification.Based on the prestack properties of prestack elastic longitudinal and transverse wave velocity ratio, a five-stage sequence single sand body is described in the target area. On this basis, the proposed horizontal well location and its trajectory are determined.The drilling success rate of pre-stack elastic inversion is more than 10% higher than that of P-wave independent inversion.
【作者单位】：东北石油大学地球科学学院;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;黑龙江省油气藏形成机理与资源评价重点实验室;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;大庆油田钻探工程公司物探一公司;
【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
【分类号】：P631.4;P618.13

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