东营凹陷超压系统与油气成藏关系  

The Relationship between Overpressure Systems and Hydrocarbon Accumulation in the Dongying Sag

作　　者：高志强[1] Gao Zhiqiang(SINOPEC Shengli Oilfield Company,Dongying,Shandong 257015,China)

机构地区：[1]中国石化胜利油田分公司,山东东营257015

出　　处：《特种油气藏》2024年第5期67-76,共10页Special Oil & Gas Reservoirs

基　　金：中国石化科技攻关项目"济阳坳陷沙四-孔店组成藏条件认识及勘探方向"(P20060-1)。

摘　　要：超压系统在东营凹陷油气运聚过程中具有重要的作用,因对其超压系统缺少动态表征,以“点—线—面”的顺序,探究压力梯度特征及其对油气的控制。研究表明:高、低梯度值区在纵向上相互叠置。平面上,沙四下亚段高梯度值分布在北部深洼带,由北向南逐渐降低;沙四上亚段—沙三下亚段高梯度值围绕各个生烃洼陷展布。压力梯度结构分为5种类型。高压-低梯度区位于洼陷中心,向外依次为高压-高梯度区、过渡-高梯度区、过渡-低梯度区和常压-低梯度区。生、储、盖构成压力梯度的物质基础、边界及结构类型,构造演化控制压力梯度纵向衰减及空间展布。与压力梯度相关的断层控制的油气呈环带状分布,而相关的岩性油藏呈分散状分布。该研究对东营凹陷滚动勘探及甜点预测具有重要的理论意义。The overpressure system plays a crucial role in the process of oil and gas migration and accumulation in Dongying Sag.Due to the lack of dynamic characterization of the overpressure system,this study investigates the pressure gradient characteristics and its control on oil and gas in a sequence of"point-line-surface".The research indicates that the areas with high and low gradient values overlap longitudinally.Planarly,the high gradient value in the lower part of the Fourth Member of Shahejie Formation is distributed in the northern deep sag and gradually diminishes from north to south.The high gradient value ranging from the upper part of the Fourth Member to the lower part of the Third Member of Shahejie Formation is distributed around each hydrocarbon generation sag.There exist five types of pressure gradient structures.The high pressure-low gradient zone is located at the center of the sag,followed outward by the high pressure-high gradient zone,the transition-high gradient zone,the transition-low gradient zone,and the normal pressure-low gradient zone.Source,reservoir and seal formations constitute the material basis,boundaries and structural types of the pressure gradient,with tectonic evolution controlling the vertical attenuation and spatial distribution of the pressure gradient.The oil and gas controlled by faults related to the pressure gradient are distributed in a ring-like pattern,and the related lithologic reservoirs are scattered.This study holds significant theoretical significance for rolling exploration and desert prediction in Dongying Sag.

关 键 词：东营凹陷 超压 压力梯度结构 控制机理 油气分布 

分 类 号：TE122[石油与天然气工程—油气勘探]