东濮凹陷文留地区咸化湖盆沙三段油源特征及成藏模式  

Crude oil and source rock characteristics and hydrocarbon accumulation model of third member of Shahejie Formation in saline lacustrine basin in Wenliu area, Dongpu Sag

作　　者：李才俊 胡涛[1,2] 庞雄奇[1,2] 肖惠译 胡耀 陈雨萱 郑定业 徐田武[4] 姜福杰[1,2] LI Caijun;HU Tao;PANG Xiongqi;XIAO Huiyi;HU Yao;CHEN Yuxuan;ZHENG Dingye;XU Tianwu;JIANG Fujie(State Key Laboratory of Petroleum Resources and Engineering,China University of Petroleum(Beijing),Beijing,102249,China;College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China;Sinopec Petroleum Exploration and Development Research Institute,Beijing 102206,China;Zhongyuan Oilfield Exploration and Development Research Institute,Puyang,Henan 45700,China)

机构地区：[1]中国石油大学(北京)油气资源与工程全国重点实验室,北京102249 [2]中国石油大学(北京)地球科学学院,北京102249 [3]中国石化石油勘探开发研究院,北京102206 [4]中国石化中原油田分公司勘探开发研究院,河南濮阳457001

出　　处：《中国海上油气》2025年第1期79-91,共13页China Offshore Oil and Gas

基　　金：国家自然科学基金面上项目“陆相页岩油含气性演化特征与成因机制及可动油评价方法(编号:41872148)”;中国石化科技专项研究项目“东濮凹陷油气富集规律及增储区带研究(编号:P15022)”部分研究成果。

摘　　要：中国广泛发育的陆相咸化湖盆已成为油气产能的主要贡献领域之一,但对含盐层系的油气成藏机理及模式研究相对薄弱。以东濮凹陷文留地区沙三段为研究对象,通过开展原油和烃源岩的色谱-质谱、单体烃碳同位素及流体包裹体等地化分析,对文留地区的沙三段的油-源特征及成藏模式进行了详细研究。结果表明:(1)文留地区沙河街组发育沙三上亚段、沙三中亚段、沙三下—沙四上亚段等多套优质烃源岩,烃源岩TOC为0.50%~6.79%、类型以Ⅱ型为主、现今正处于高—过成熟阶段,生烃潜力大;(2)沙三段原油组分主要以饱和烃为主,CPI接近于1.0,Pr/Ph为0.13~0.63,伽马蜡烷指数为0.50~1.00,单体碳同位素为-32‰~-28‰,油源主要来自沙三中亚段和沙三下—沙四上烃源岩;(3)文留地区沙三段油气成藏期主要为东营组沉积中晚期(31.0~22.0 Ma)和明化镇组沉积末期—现今(6.2~0 Ma),其中东营组沉积中晚期主要在隆起区富集形成构造、岩性类油气藏,明化镇组沉积末期—现今主要在斜坡带及近洼位置富集形成致密油气藏;(4)文留地区沙三段油气从浅到深呈现出常规-非常规有序分布的特征,常规油气藏主要形成并分布在浅层的构造隆起区,非常规油气藏主要形成并分布在斜坡带—洼陷中心的区域。研究结果对文留地区油气发现和勘探部署具有指导意义。The widely developed continental saline lacustrine basins in China have already become a major contributor to petroleum production, but the research on the mechanisms and model of hydrocarbon accumulation in salt-bearing strata is relatively weak. In this paper, the third member of Shahejie Formation (E2s3) in Wenliu area, Dongpu Sag was taken as the research object, and the crude oil and source rock characteristics and hydrocarbon accumulation model of E2s3 in Wenliu area were investigated through analyses of chromatography-mass spectrometry, individual hydrocarbon and carbon isotopes, and fluid inclusions of crude oil and source rocks. The results show that: ① Multiple sets of high-quality source rocks are developed in the E2s3 in Wenliu area such as the upper segment of E2s3 (E2s3u), middle segment of E2s3 (E2s3m) , and lower segment of E2s3 (E2s3l) to upper segment of E2s4 (E2s4u), with total organic carbon (TOC) of source rocks ranging from 0. 50% to 6. 79%, and they are dominated by type Ⅱ. The source rocks are currently mature and highly mature, with great hydrocarbon generation potential. ② The components of crude oil in E2s3 are mainly saturated hydrocarbons. The carbon preference index (CPI) is close to 1. 0, Pr/Ph ranges from 13 to 0. 63, the gammacerane index is 0. 50-1. 00, and the individual carbon isotopes are from −32‰ to −28‰. The crude oil and source rocks mainly come from the source rocks in E2s3m and E2s3l-E2s3u. The reservoirs of E2s3 in Wenliu area are primarily formed in the middle-late Dongying Period (31. 0-22. 0 Ma) and the late Minghuazhen to present period (6. 2-0 Ma). In the middle-late Dongying Period, hydrocarbons were mainly accumulated in the uplift area to form structural and lithological reservoirs, while in the late Minghuazhen to present period, hydrocarbons were primarily accumulated in slope zones and areas near the sag to form tight reservoirs. ④ The reservoirs of E2s3 in Wenliu area exhibit conventional and unconventional orderly distribution from shallow t

关 键 词：东濮凹陷 咸化湖盆 沙河街组 油源特征 成藏模式 文留地区 

分 类 号：TE122.1[石油与天然气工程—油气勘探]