基于构造约束的地震速度建模及在东海气田中的应用  

Applying seismic velocity modeling based on 3D geological modeling to a gas field in the East China Sea

作　　者：王伟 陈易周 刘晓晖 王腊梅 李洋森 焦社保 WANG Wei;CHEN Yizhou;LIU Xiaohui;WANG Lamei;LI Yangsen;JIAO Shebao(Shanghai Branch of CNOOC Ltd.,Shanghai 200335,China)

机构地区：[1]中海石油(中国)有限公司上海分公司,上海200335

出　　处：《上海国土资源》2020年第3期93-96,103,共5页Shanghai Land & Resources

基　　金：国家科技重大专项“东海厚层非均质性大型气田有效开发关键技术”(2016ZX05027-004)。

摘　　要：地震速度研究是地下真实构造解释和储层预测等研究的基础。在海上井少的研究区,地震速度空间规律则显得尤为重要。面对复杂的构造运动及沉积作用影响时,常用的速度研究方法难以实现反映地下复杂的速度规律。本文采用的基于三维地质模型约束下的速度建模技术是一种在真实三维构造格架约束下,它充分结合测井速度和地震速度建立速度场的方法,能够解决研究区地下结构复杂、地层速度横向变化剧烈的问题,该方法应用于东海气田时深转换和反演低频模型中,提高了其构造成图和储层反演精度,在深度预测、井位设计、油藏评价、储层预测等方面具有较好的应用效果。Seismic velocity studies are the basis for interpreting real underground structures and predicting reservoirs.The spatial law of seismic velocity is particularly important in a study area with few offshore wells.In an area with complex tectonic movements and sedimentation,it is difficult for commonly used velocity research methods to reflect complicated underground velocity properties.In this study,a velocity modeling technique based on 3D geological modeling is employed as a method that fully combines logging and seismic velocities to establish a velocity field under the constraint of a real 3D structural lattice.It combines well logging and seismic velocities to establish a velocity field that can solve the problem of lateral velocity variation in the complex underground structure in the research area.This method is applied to time–depth conversion and a low-frequency inversion model of a gas field and is able to improve the accuracy of its structural mapping and reservoir inversions.It also has a good application in depth prediction,well location selection,and reservoir prediction and evaluation.

关 键 词：地震速度 三维地质模型 速度建模 构造成图 深度预测 

分 类 号：P641.46[天文地球—地质矿产勘探]