西部山前带黄土砾石区静校正方法  

Research on the static correction method for the loess and gravel area in western foothill belt

作　　者：崔庆辉[1] 尚新民[1] 腾厚华 金昌昆 赵胜天[1] 宋桂桥[2] CUI Qinghui;SHANG Xinmin;TENG Houhua;JIN Changkun;ZHAO Shengtian;SONG Guiqiao(Geophysical Research Institute,Shengli Oilfield Branch Co.,Sinopec,Dongying,Shandong 257022,China;Exploration&Development Affairs Department,Sinopec,Beijing 100728,China)

机构地区：[1]中国石油化工股份有限公司胜利油田分公司物探研究院,山东东营257022 [2]中国石油化工股份有限公司油田勘探开发事业部,北京100728

出　　处：《石油地球物理勘探》2021年第2期226-233,I0007,共9页Oil Geophysical Prospecting

基　　金：胜利油田地震成像联合实验室及中国石油化工股份有限公司科技攻关项目“准噶尔南缘山前带地震技术攻关”(PE19007-5)资助。

摘　　要：准噶尔盆地南缘山前带的近地表呈黄土、砾石二元结构且变化剧烈,常规的近地表建模及静校正效果差强人意。为了构建精准的山前带近地表结构模型,以便做好激发井深设计及静校正处理,首先基于微测井测量数据细究山前带近地表特性,厘清近地表黄土层和砾石层的速度、时深关系等;其次通过地质统计学方法求证了黄土与砾石厚度具有良好的空间自相关性,并优选克里金插值法建立黄土和砾石厚度模型,利用黄土底界和砾石底界与地表的相似系数对该厚度模型进行校正,以提高建模精度;最后提出分层时深曲线静校正方法并应用于实际地震资料,所得结果表明该方法的处理效果和效率均优于常规方法。In the study area located in the foothill belt in the southern edge of the Junggar Basin,the nearsurface structure is the mixture of loess and gravel which changes drastically.Therefore,conventional near-surface modeling and static correction is less effective.In order to build a model of the nearsurface structure for shot depth design and static correction,first we studied the characteristics of the near-surface zone in the foothill belt based on the uphole data,and summarized the near-surface velocity and time-depth relation.Then we proved the loess layer and the gravel layer have a good spatial autocorrelation in thickness by geostatistics,modeled the thickness of loess and gravel by selecting a best Kriging interpolation,and correct the model by the similarity coefficient of the bottom of loess or gravel and the surface to improve the modeling accuracy.Finally,we proposed a layered time-depth curve static correction and applied it to real data.The efficiency and effect of this static correction method are better than conventional methods.

关 键 词：山前带 黄土砾石区 近地表建模 时深关系曲线 静校正 

分 类 号：P631[天文地球—地质矿产勘探]