冀中坳陷文安斜坡二叠系剩余压力与油气成藏关系研究  

Research on the relationship between Permian residual pressure and accumulation in Wen’an Slope of Jizhong Depression

作　　者：赵莹彬 韩向义 于函 潘清华 淡伟宁[1] 窦连彬[1] 古强 刘丹丹[1] 罗静[1] ZHAO Yingbin;HAN Xiangyi;YU Han;PAN Qinghua;DAN Weining;DOU Lianbin;GU Qiang;LIU Dandan;LUO Jing(Exploration&Development Research Institute of Huabei Oilfield Company,PetroChina,Renqiu 062552,China)

机构地区：[1]中国石油天然气股份有限公司华北油田分公司勘探开发研究院,河北任丘062552

出　　处：《石油地质与工程》2025年第2期28-38,共11页Petroleum Geology and Engineering

基　　金：中国石油天然气股份有限公司华北油田分公司科研项目“冀中探区天然气成藏机制及高效发现动用关键技术研究”(1623KQ100002002)。

摘　　要：冀中坳陷文安斜坡仅S20井、W23井和W53井等少数井在二叠系上石盒子组钻遇气藏,气藏分布及成藏规律不明。基于前人研究成果,从成藏动力学角度出发,分析上石盒子组压力结构及其剩余压力发育特征,并分析其与油气成藏关系。结果表明,纵向上,气藏的发育和富集程度受控于压力结构类型,天然气在突变型压力结构内部相对低压区带富集程度最高;过渡型压力结构为顶面弱突变特征,在有利构造背景下的圈闭中亦可成藏,其富集程度次之;渐变型压力结构天然气可以突破其顶界面向上运移,保存条件差,不利于气藏形成。平面上,气藏分布与剩余压力的变化趋势密切相关,首先太原组与上石盒子组的源储压差为油气二次运移提供动力,压差值越大动力越充足,与断层相匹配有利于纵向输导成藏;其次气藏分布于上石盒子组有利构造背景下由高势区向低势区运移路径上的圈闭中,即剩余压力高值背景下的相对低值区。该研究对文安斜坡上石盒子组有利勘探靶区优选具有一定的指导作用。In Wen’an Slope of the Jizhong Depression,only a few wells such as Well S20,Well W23 and Well W53 have encountered gas reservoirs in the upper Shihezi Formation of the Permian System.The distribution of the gas reservoirs and the laws of reservoir formation remain unclear.Based on previous research results,from the perspective of reservoir-forming dynamics,the pressure structure and the development characteristics of residual pressure in the upper Shihezi Formation,and explores the relationship with hydrocarbon accumulation were analyzed.The results indicate that vertically,the development and enrichment degree of gas reservoirs are controlled by the type of pressure structure,and natural gas has the highest enrichment degree in the relatively low-pressure zone within the abrupt pressure structure.The transitional pressure structure features a weak abrupt change at the top surface.In the traps under favorable tectonic backgrounds,hydrocarbon accumulation can also occur,but the degree of its enrichment ranks second.For the gradually changing pressure structure,natural gas can migrate upward through its top interface.With poor preservation conditions,it is not conducive to the formation of gas reservoirs.On the plane,the distribution of gas reservoirs is closely related to the trend of residual pressure changes.Firstly,the pressure difference between the source rock in the Taiyuan Formation and the reservoir rock in the upper Shihezi Formation provides the driving force for the secondary migration.The larger the pressure difference,the more sufficient the driving force.When it matches with the faults,it is conducive to vertical transportation and reservoir formation.Secondly,the gas reservoirs are distributed in the traps on the migration path from the high potential area to the low potential area under the favorable tectonic background of the upper Shihezi Formation,that is,in the relatively low value areas against the background of high residual pressure values.This study provides a good guidance for selecting

关 键 词：文安斜坡 上石盒子组 压力结构类型 剩余压力 富集成藏 

分 类 号：TE122[石油与天然气工程—油气勘探]