富油凹陷油气分布规律与勘探潜力分析:以东濮凹陷为例  

Analysis of oil and gas distribution and exploration potential in oil-rich depression:Taking Dongpu Depression as an example

作　　者：徐田武[1] 张洪安[2] XU Tianwu;ZHANG Hong’an(Exploration and Development Research Institute,Zhongyuan Oilfield Company,SINOPEC,Puyang 457001,China;Zhongyuan Oilfield Company,SINOPEC,Puyang 457001,China)

机构地区：[1]中国石油化工股份有限公司中原油田分公司勘探开发研究院,河南濮阳457001 [2]中国石油化工股份有限公司中原油田分公司,河南濮阳457001

出　　处：《地学前缘》2024年第6期368-380,共13页Earth Science Frontiers

基　　金：新型油气勘探开发国家重大专项“渤海湾盆地含油气系统成藏机理与剩余资源分布(2024ZD14001-001)”;中国石化科技部项目“华北地区战略选区研究(P22064)”“东濮凹陷薄互层页岩油地质评价与关键技术(P23227)”。

摘　　要：渤海湾盆地各大油田均进行了长期的精细勘探,但最新资源评价仍表明富油气凹陷剩余资源潜力大,剩余资源丰度高,仍将是勘探开发坚持的长期阵地。如何深化富油气凹陷的油气富集规律,将对下一步油气勘探具有重要的指导意义。本文从烃源岩角度入手,明晰东濮凹陷古近系湖相泥岩和上古生界煤系源岩成烃特征,然后结合典型油气藏解剖和油气藏评价单元,建立源藏对应关系,结合其他成藏要素,建立油气成藏模式并明晰剩余油气富集规律。研究表明:东濮凹陷古近系富油气凹陷具有近源聚集、连续成藏和断超控富的特征,油气主要来自TOC含量大于1.0%的优质烃源岩,富油气区之所以富集油气主要是由于富油气区具有多套优质源岩、多含油气系统和多期油气成藏的“三多”特征。东濮凹陷上古生界煤成气主要分布在煤系源岩热演化程度R_(o)大于1.3%的区域,存在源内和源外两种成藏模式。上述成果认识,不仅将为常规油气藏的勘探提供技术支撑,也将为薄层致密油、页岩油的勘探提供技术支撑。The major oil fields in the Bohai Bay Basin have undergone long-term detailed exploration,yet the latest resource assessments still indicate a large potential for remaining resources in oil-rich depressions with high resource abundance.These areas will continue to be a long-term focus for exploration and development.Deepening the understanding of hydrocarbon accumulation patterns in oil-rich depressions is crucial for guiding future oil and gas exploration.This paper begins from the perspective of source rocks,clarifying the hydrocarbon generation characteristics of the Paleogene lacustrine shales in the Dongpu Depression and the coal-bearing source rocks of the Upper Paleozoic.It then integrates typical oil and gas reservoir analyses and reservoir evaluation units to establish a correspondence between source and reservoir.By combining this with other accumulation factors,it aims to develop hydrocarbon accumulation models and clarify the patterns of remaining oil and gas enrichment.The research indicates that the oil-rich depression in the Dongpu Depression is characterized by“proximity to source aggregation,continuous accumulation,and fault-controlled richness”.The hydrocarbons primarily originate from high-quality source rocks with TOC greater than 1.0%.The richness of oil and gas in the oil-rich zones is mainly due to the presence of multiple sets of high-quality source rocks,multiple oil and gas systems,and multiple stages of hydrocarbon accumulation,referred to as the“three multiplicities”.In the Dongpu Depression,coalbed methane is primarily distributed in areas where the thermal maturity level of coal-bearing source rocks(Ro)exceeds 1.3%,exhibiting both in-source and out-of-source accumulation modes.The findings of this study not only provide technical support for the exploration of conventional oil and gas reservoirs but also for the exploration of thin-layer tight oil and shale oil.

关 键 词：东濮凹陷 富油凹陷 煤成气 成藏模式 富集规律 

分 类 号：P618.130.2[天文地球—矿床学]