提高浅层地震成像品质的处理技术——以川中地区沙溪庙组为例  

Processing workflow for improving shallow seismic image quality on GeoEast platform:A case study on Shaximiao Formation in central Sichuan Basin

作　　者：干大勇 高宪伟 朱丹 杨广广 吕龑 韩嵩 GAN Dayong;GAO Xianwei;ZHU Dan;YANG Guangguang;LYU Yan;HAN Song(Research Institute of Exploration and Development,PetroChina Southwest Oil&Gas Field Company,Chengdu,Sichuan 610041,China;GRI,BGP Inc,CNPC,Zhuozhou,Hebei 072750,China;Regional Geological Survey Crew,Sichuan Geologicaland Mineral Bureau,Chengdu,Sichuan 610000,China)

机构地区：[1]中国石油西南油气田公司勘探开发研究院,四川成都610041 [2]东方地球物理公司研究院,河北涿州072751 [3]四川省地质矿产勘查开发局区域地质调查队,四川成都610000

出　　处：《石油地球物理勘探》2020年第S01期56-63,6-7,共10页Oil Geophysical Prospecting

基　　金：国家科技重大专项“致密气有效储层预测技术”(2016ZX05047-002-05)资助

摘　　要：川中地区浅层沙溪庙组河道砂岩较发育,是该区新一轮的勘探开发目标层系。针对川中地区浅层地震资料存在的低分辨率和低信噪比等问题和难点,运用GeoEast软件开展保真、保幅、提高分辨率的数据处理。首先分析原始资料,找出处理难点;再分别对静校正、叠前保幅去噪、叠前时间偏移和道集优化等方面开展处理试验,优选适合研究区特点的处理参数及流程;最后进行全工区资料的批量处理。最终得到一套波组特征清晰、信噪比较高、浅层同相轴连续性好、偏移归位合理的高分辨率地震资料,为后续的河道砂岩储层精细预测及含气性检测奠定了基础。The developed channel sandstone of the Shaximiao Formation in the central Sichuan Basin is a new target of oil exploration and development.To cope with problems and difficulties existing in the shallow seismic data of the central Sichuan Basin,GeoEast software was used to carry out fidelity and amplitude preservation to improve the resolution of the seismic data.After analyzing the original seismic data,difficulties in data processing were found out,then corresponding technical measures were taken,including processing experiments on static corrections,denoising while preserving prestack amplitude,prestack time migration and trace gather optimization,and finally the processing parameters and processes suitable for the characteristics of the study area were summarized for batch processing of all data.Based on the result,high-resolution seismic data were obtained with active characteristics of wave group,high signal-to-noise ratio,continuous shallow events and reasonable migration.They are the basic data for fine prediction of channel sandstone reservoirs and seismic detection of gas-bearing property.

关 键 词：GeoEast 四川盆地 沙溪庙组 处理流程 静校正 

分 类 号：P631.4[天文地球—地质矿产勘探]