基于匹配追踪算法的高精度页岩气“甜点”识别

发布时间：2019-04-23 22:34

【摘要】：中国页岩气资源开发近年来已取得了许多阶段性进展,但因勘探开采成本高、风险大,因此在钻井资料较少的情况下,充分利用地震资料的横向变化特征,精确刻画页岩气"甜点"区分布具有重要意义。常规叠后地震反演方法能够识别页岩层,但不能有效区分含气页岩层与非含气页岩层,而基于地震波衰减理论的流体活动因子能够有效表征储集层的渗透性,识别含气页岩储层。提出将流体活动因子与高精度匹配追踪算法相结合,在地震信号时频分解的基础上,建立含气页岩层与地震波衰减的联系,求取流体活动性属性,进而实现高精度页岩气"甜点"识别。该方法不受测井资料及构造解释的影响,能客观反映页岩层的含气性,适用于页岩气勘探初期钻探目标评价。理论模型试算和在中国南方复杂构造区海相页岩气勘探中的实际应用表明了该方法的有效性。
[Abstract]:The development of shale gas resources in China has made a lot of progress in recent years. However, due to the high cost and high risk of exploration and exploitation, the lateral variation characteristics of seismic data are fully utilized in the case of less drilling data. It is of great significance to accurately depict the distribution of desserts in shale gas. The conventional post-stack seismic inversion method can identify shale strata, but can not effectively distinguish gas-bearing shale rocks from non-gas-bearing shale rocks, and the fluid activity factor based on seismic wave attenuation theory can effectively characterize the permeability of reservoir. Identify gas shale reservoirs. Based on the time-frequency decomposition of seismic signal, the relationship between gas-bearing shale and seismic wave attenuation is established by combining fluid activity factor with high-precision matching tracking algorithm, and the fluid activity attribute is obtained. And then achieve high-precision shale gas "dessert" identification. This method is not affected by logging data and structural interpretation, and can objectively reflect the gas bearing of shale rocks. It is suitable for the evaluation of drilling targets in the early stage of shale gas exploration. The experimental calculation of theoretical model and its practical application in marine shale gas exploration in complex tectonic area of southern China show the effectiveness of this method.
【作者单位】：中石油勘探开发研究院油气地球物理研究所廊坊院区;中国石油大学(北京)非常规天然气研究院;
【基金】：中国石油集团公司物探重点实验室新技术新方法项目(2014A-3612)资助
【分类号】：P631.4

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