叠前地震保真高分辨率处理技术在西南某地页岩气微幅裂缝中的应用实践  

Application of prestack seismic fidelity and high-resolution processing technology in micro-fractures of shale gas in southwest China

作　　者：徐明华 付建元 何良盛 XU Minghua;FU Jianyuan;HE Liangsheng(PetroChina Chuanqing Drilling Engineering Company Geological Exploration and Development Research Institute,Chengdu 610056,China)

机构地区：[1]中国石油川庆钻探工程公司地质勘探开发研究院,成都610056

出　　处：《物探化探计算技术》2023年第6期747-756,共10页Computing Techniques For Geophysical and Geochemical Exploration

基　　金：中国石油天然气集团有限公司科学研究与技术开发项目(2021DJ4204)。

摘　　要：研究区页岩气地质条件复杂,具有非均质性很强,储层薄且横向分布不稳定等特征。常规地震处理方法得到的结果分辨率低,无法识别薄层、地层尖灭点、微幅裂缝。为了解决这些问题,这里利用保真高分辨率地震处理技术对研究区页岩气的地震资料进行处理,该技术将叠前谱蓝化校正、AVA振幅校准、道集剩余噪音衰减、剩余时差校正、叠前剩余多次波压制和高精度井震标定定量质控等方法有序结合,能够有效提高复杂地震资料的分辨率、信噪比和保真度。处理结果证明,该方法能够提高该地区地震资料的分辨率、井震相关系数。同时,增强了薄层的可解释性、同相轴的连续性、尖灭点的准确性、断层检测的可靠性。Weiyuan shale gas has complex geological conditions,strong heterogeneity,thin reservoirs,and unstable lateral distribution.The results obtained by conventional seismic processing methods have low resolution and cannot identify thin layers,formation pinch-out points,and micro-fractures.In order to solve these problems,this paper uses high-fidelity,high-resolution seismic processing technology to process the seismic data of Weiyuan shale gas.The orderly combination of methods such as correction,pre-stack residual multiple suppression,and high-precision well seismic calibration quantitative quality control can effectively improve the resolution,signal-to-noise ratio,and fidelity of complex seismic data.The processing results prove that this method can improve seismic data's resolution and well-seismic correlation coefficient in this area.At the same time,the interpretability of thin layers,the continuity of events,the accuracy of pinch-out points,and the reliability of fault detection are enhanced.

关 键 词：页岩气 薄储层 高分辨率 高保真度 谱蓝化校正 振幅校准 定量质控 

分 类 号：P631.4[天文地球—地质矿产勘探]