地震资料信噪比在K油田潜山内幕时深转换中的应用研究  

Application of seismic signal to noise ratio in time-depth conversion in buried hill of K oilfield

作　　者：高文博 刘欢 邬静 薛明星 GAO Wenbo;LIU Huan;WU Jing;XUE Mingxing(Tianjin Branch of CNOOC Ltd,Tianjin 300459,China)

机构地区：[1]中海石油(中国)有限公司天津分公司,天津300459

出　　处：《物探化探计算技术》2018年第5期607-614,共8页Computing Techniques For Geophysical and Geochemical Exploration

基　　金：国家重大专项(2011ZX05023-006-002)

摘　　要：渤海K油田潜山位于L凸起边界断层上升盘,该凸起周边已发现多个大中型油田,且K油田潜山古生界、太古界地层直接与紧邻的LZ凹陷沙三段烃源岩广泛接触,供烃条件好。K油田古潜山具有较好的勘探前景。但渤海K油田古潜山地层钻探程度较低,边界断层两侧地层速度变化快,速度认识不清,造成了时深转换存在多解性而且无井约束与验证的问题。利用正演技术分析不同构造类型,地震覆盖次数的差异。由于覆盖次数与地震资料信噪比存在一定的关系,利用该关系可分析渤海K油田构造高部位信噪比所反映的构造类型,根据分析的构造类型选取合适的时深转换方法。The buried hill of Bohai K oilfield is located on the rising disk of the boundary of L uplift.A number of oil fields have been discovered around the L uplift.Beside the Paleozoic and Archaean strata of K oilfield are directly related to the source rocks of the Sha-3 Member in the LZ depression,which could provide a lot of hydrocarbon sources,so the buried hill of K oilfield has a good prospect of exploration.However,the drilling igneous rock in Bohai K oilfield is low,and the velocity of the strata on both sides of the boundary fault is changing fast.So the time-depth conversion is multiplicity because of the cryptic velocity and no drilled well constraint.We use the geophysical forward calculation to analyze the differences of different structural types and seismic coverages.Because of the relationship between seismic coverages and the signal-to-noise ratio,we could use it to analyze different SNR corresponding to which type of structural.Then we can select suitable time-depth conversion method according to the construction type.

关 键 词：古潜山 盖次数 信噪比 时深转换 

分 类 号：P631.4[天文地球—地质矿产勘探]