东濮凹陷古近系页岩油富集地质条件与勘探前景  

Geological characteristics and exploration prospects of Paleogene continental shale oil accumulation in Dongpu Sag,Bohai Bay Basin

作　　者：李浩[1] 王保华[1] 陆建林[1] 鹿坤[2] 王苗[1] 周燕[2] 赵琳洁 LI Hao;WANG Baohua;LU Jianlin;LU Kun;WANG Miao;ZHOU Yan;ZHAO Linjie(Research Institute of Wuxi Petroleum Geology, Research Institute of Exploration and Development, SINOPEC ,Wuxi 214126, China;Research Institute of Exploration and Development, Zhongyuan Oilfield Company, SINOPEC, Puyang 457001, China)

机构地区：[1]中国石化石油勘探开发研究院无锡石油地质研究所,江苏无锡214126 [2]中国石化中原油田分公司勘探开发科学研究院,河南濮阳457001

出　　处：《中国石油大学学报（自然科学版）》2021年第3期33-41,共9页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家科技重大专项(2017ZX05049-001-006);中国石化科技部项目(P15094)。

摘　　要：针对东濮凹陷古近系沙河街组三段泥页岩层系,根据页岩含油性、页岩油可动性以及多尺度微观储层表征等多种试验技术手段,地质分析、试验测试与盆地模拟相结合,从资源丰度、储渗性、流动性、保存以及可压性等方面分析陆相页岩油富集主控因素,落实东濮凹陷页岩油形成有利地质条件与勘探潜力。结果表明陆相页岩油富集应具备5个关键因素,其中资源丰度是基础,泥页岩地层储渗性是关键,页岩油流动性是高产的保障,顶底板发育与超压的存在是富集的保存条件,高脆性矿物与低黏土矿物质量分数是可压的基础;东濮凹陷沙三段中下亚段内斜坡及洼陷带富有机质纹层状碳酸盐岩及混合细粒沉积岩等优势岩相较发育,以中高演化程度为主,可动油资源丰度较高,且具备稳定分布的膏盐或泥岩顶底板,纯泥页岩型、夹层型以及盐间高温高压致密型3种页岩油类型均具备油气富集的有利地质条件,其中文东内斜坡带、濮卫次洼、柳屯洼陷、海通集洼陷为页岩油富集的有利区带,页岩油勘探潜力较大。This study addresses the main controlling factors of continental shale oil enrichment,and clarify the favorable geological conditions and exploration potentials of shale oil formation in the Dongpu Depression.A variety of experimental techniques are considered,including shale oiliness,shale oil mobility,and multi-scale micro-reservoir characterization,combining geological analysis,experimental testing and basin simulation to analyze resource abundance,storage and permeability,fluidity,preservation and compressibility.Our analyses have shown that the enrichment of continental shale oil should have five key factors.Among them,resource abundance is the foundation,shale formation reservoir permeability is the key,shale oil fluidity is the guarantee of high production,roof and floor development and overpressure is the preservation condition for enrichment,and the high brittle mineral content and low clay mineral content are the basis for compressibility.Dominant rocks such as organic-rich laminar carbonates and mixed fine-grained sedimentary rocks in the inner slopes and sags of Es3 Formation in the Dongpu Sag are relatively developed.The shale oil in this area is dominated by a medium-to-high degree of evolution,and movable oil resources are relatively abundant.The area has stable distribution of gypsum salt or mudstone roof and floor.The three types of shale oil,pure mud shale type,interbedded type,and inter-salt tight type all have favorable geological conditions for enrichment.The middle and lower Es3 Formation of the Wendong inner slope zone,Puwei subsag,and Liutun subsag in Dongpu Sag have favorable conditions for enrichment of continental shale oil.

关 键 词：陆相页岩油 富集要素 优势岩相 储渗性 流动性 东濮凹陷 

分 类 号：P631.81[天文地球—地质矿产勘探]