基于构造-流体耦合约束的变速成图方法及其在东海A气田挖潜阶段的成功应用  

Variable velocity mapping based on structure-fluid coupling constraints and its successful application in A Gas Field in the East China Sea

作　　者：涂齐催 娄敏 毛云新 王伟 黄鑫 李炳颖 王腊梅 陈易周 TU Qicui;LOU Min;MAO Yunxin;WANG Wei;HUANG Xin;LI Bingying;WANG Lamei;CHEN Yizhou(Shanghai Branch of CNOOC(China)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：《海洋地质前沿》2022年第12期56-63,共8页Marine Geology Frontiers

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);中海石油(中国)有限公司综合科研项目“西湖凹陷在生产油气田中后期综合调整关键技术研究与实践”(CNOOC-KJ 135 ZDXM 39 SH03)。

摘　　要：时深转换是构造解释关键步骤之一,时深转换方法主要包括常速成图与变速成图两大类。常速成图操作简单,应用普遍,但不适合速度场横向变化剧烈的工区。建立一种适应速度场横向变化且符合工区地质及油气藏特征的时深转换方法,是本研究探讨的重点。迭代变速成图技术基于叠加速度反演,综合了流体检测成果,通过不断优化速度场开展变速成图,能较准确地预测地下复杂构造的深度,该方法刻画的构造油气藏含气范围与流体检测分布一致,实现了同一油气藏的分布在不同地震信息维度下的耦合。利用迭代变速成图技术,较好解决了A气田钻前构造气藏面积与“亮点”展布范围之间的矛盾,统一了地质油藏认识,扩大了地质储量,有效推动了A气田的挖潜与调整,实现了增储上产。Time-depth conversion is one of the key steps in structural interpretation.It includes mainly two categories:constant-velocity mapping and variable-velocity mapping.The constant-velocity mapping is not suitable for a work area whose lateral velocity field changes intensely.The key point of this paper is to establish a time-depth conversion method that is suitable for the field with variation of lateral velocity and in accordance to the geological characteristics,for which an iterative variable velocity mapping technique was developed based on the inversion of superposition velocity,and the results of hydrocarbon detection were integrated.The iterative mapping technique was applied to the mapping of various complex underground structures,and the results are consistent with the distribution of hydrocarbon and geological implications.In addition,by using the iterative mapping technique,the controversy between structural gas reservoir area,"bright spot"area in the A Gas Field was well solved,and the geological reserves were expanded,and the construction and development of A Gas Field was effectively promoted.

关 键 词：速度建模 烃类检测 变速成图 时深转换 深度预测 

分 类 号：P744.4[天文地球—海洋科学] P618.13