断陷盆地中浅层油气成藏特征及有利区预测:以渤南洼陷沙二段为例  

Hydrocarbon Accumulation Characteristics and Prospectivity Prediction on Medium-Shallow Sequences in Rift Basins:Case Study on the 2nd Member of Shahejie Formation in Bonan Sag

作　　者：刘鹏[1,2] 杜鹏伟[3] LIU Peng;DU Pengwei(Research Institute of Petroleum Exploration and Development,Shengli Oilfield Company,SINOPEC,Dongying,Shandong 257000,China;Working Stations for Postdoctors,Dongying,Shandong 257000,China;No.7 Oil Production Plant of PetroChina Changqing Oilfield Branch,Xi'an,Shaanxi 710200,China)

机构地区：[1]中国石化胜利油田分公司勘探开发研究院,山东东营257000 [2]中国石化胜利油田分公司博士后流动工作站,山东东营257000 [3]中国石油长庆油田分公司第七采油厂,陕西西安710200

出　　处：《现代地质》2020年第4期849-857,共9页Geoscience

基　　金：中国石化胜利油田博士后科技攻关项目“渤南洼陷沙三段常规页岩油聚集机理”(YKB1803);中国石化科技攻关项目“济阳坳陷页岩油可动性主控因素与甜点评价”(P19017-6)。

摘　　要：断陷盆地中浅层圈闭往往覆盖在烃源岩之上,具有多源供烃特征。为深化断陷盆地中浅层油气成藏特征认识及明确有利勘探方向,以渤南洼陷沙二段(简称为Es2)为例,依据钻井、测井、地震及分析化验等资料开展了研究。结果表明:渤南洼陷沙四上亚段(简称为Es4s)、沙三段(简称为Es3)和沙一段(简称为Es1)3套烃源岩分别在馆陶组沉积晚期和明化镇组沉积晚期为沙二段油气成藏提供了油气来源;断裂体系沟通油源,为油气纵向运移的通道,是油气成藏的必要条件之一;储集层物性决定含油性,是含油程度高低的关键;渤南洼陷沙二段存在“两期成藏、多源供烃”油气运聚规律,不同成藏期次下形成的单源油和混源油油藏聚集在多类型圈闭中;“多源供烃”成藏模式及其成藏主控因素共同指示出渤南洼陷沙二段下一步的有利勘探方向为中部滩坝砂岩、南部扇三角洲前缘以及西南部多类型储层发育区,各区带油气勘探重点不一,勘探风险各异。The medium-shallow traps of rift basin often covered source rocks,and the reservoir has the characteristics of multi-sourced hydrocarbons.To deepen the understanding of hydrocarbon accumulation characteristics and delineate favorable exploration targets on medium-shallow sequences in rift basins,we took the 2nd member of the Shahejie Formation in the Bonan sag as an example.Based on data of drilling,logging,seismic and other analyses,we demonstrate that three source rock suites(Es4s,Es3,Es1)in the Bonan sag may have provided the oil and gas for hydrocarbon accumulation in Es2,during the deposition of Upper Guantao Formation and Upper Minghuazhen Formation.Fault system is likely a key condition for hydrocarbon accumulation,which connects oil sources and provides a vertical channel for oil and gas migration.Physical properties of the reservoir determines the oil-bearing properties,which in turn determines the degree of oil endowment.Oil and gas migration and accumulation regularity of“two-stage reservoir-forming and multi-sourced hydrocarbon”exists in the 2nd member of Shahejie Formation,and the single-sourced oil and mixed-source oil reservoirs were formed in different types of traps with the different hydrocarbon migration and accumulation regularities.The model of“multi-sourced hydrocarbon”and its major controlling factors indicate the favorable exploration direction of Es2 in Bonan sag,The favorable exploration direction is likely the central beach-bar sandstone,the southern fan delta-front edge and the southwestern multi-type reservoir development zone.The focus of oil and gas exploration in each area is likely different,and so is the risk of exploration.

关 键 词：断陷盆地中浅层 成藏特征 多源供烃 有利区预测 渤南洼陷 沙二段 

分 类 号：TE122[石油与天然气工程—油气勘探]