石油与天然气地质 ›› 2025, Vol. 46 ›› Issue (4): 1152-1168.doi: 10.11743/ogg20250409

• 油气地质 • 上一篇    下一篇

渤海湾盆地东濮凹陷全油气系统特征及其成藏模式

徐田武1(), 李素梅2,3, 陈湘飞4, 马学峰5, 邓硕5, 张莹莹1   

  1. 1.中国石化 中原油田分公司 勘探开发研究院,河南 濮阳 457001
    2.中国石油大学(北京) 资源与工程国家重点实验室,北京 102249
    3.中国石油大学 地球科学学院,北京 102249
    4.中国石油 东方地球物理公司研究院库尔勒分院,新疆 库尔勒 841000
    5.中国石油 华北油田分公司 勘探开发研究院,河北 任丘 062552
  • 收稿日期:2025-05-06 修回日期:2025-06-19 出版日期:2025-08-30 发布日期:2025-09-06
  • 第一作者简介:徐田武(1981—),男,正高级工程师,地质学。E-mail: 359329306@qq.com
  • 基金项目:
    全油气系统理论与非常规油气成藏机制(2021DJ0101);国家自然科学基金项目(42073064);新型油气勘探开发国家科技重大专项(2024ZD1400100)

Characteristics and hydrocarbon accumulation models of the whole petroleum system in the Dongpu Sag, Bohai Bay Basin

Tianwu XU1(), Sumei LI2,3, Xiangfei CHEN4, Xuefeng MA5, Shuo DENG5, Yingying ZHANG1   

  1. 1.Exploration and Development Research Institute,Zhongyuan Oilfield Company,SINOPEC,Puyang,Henan 457001,China
    2.State Key Laboratory of Petroleum Resources and Engineering,China University of Petroleum (Beijing),Beijing 102249,China
    3.College of Geosciences,China University of Petroleum,Beijing 102249,China
    4.Korla Branch of Geophysical Research Institute,BGP Inc. ,CNPC,Korla,Xinjiang 841000,China
    5.Research Institute of Exploration and Development,Huabei Oilfield Company,PetroChina,Renqiu,Hebei 062552,China
  • Received:2025-05-06 Revised:2025-06-19 Online:2025-08-30 Published:2025-09-06

摘要:

渤海湾盆地东濮凹陷作为典型的古近系-新近系盐湖相富油气凹陷,目前油气勘探工作正处于颈瓶期。综合运用地质与地球化学研究方法,系统解析了该区油气的生成条件、成因机制与成藏差异特征。研究结果表明: 该凹陷发育5套烃源岩与4套膏盐岩层系,具有多断裂-多隆起-多洼陷的构造格局。储集层非均质性显著、油气性质及其成因类型多样,构成中、浅层常规油气藏类型完整、深层致密油气与页岩油气成藏条件优越的大型全油气系统。区内油气性质与空间分布受9个洼陷控制,形成了北部盐湖相、中间过渡相和南部淡水湖相3大类共9个小类油气,发育11种成藏模式;其中,含盐区中央隆起带或洼中隆构造带是油气最富集区,且多为常规油气藏。基于全油气系统理论,建立了受不同类型动力场控制的油气成藏综合模式,明确了常规油气、致密油气和页岩油气的有利分布区,为研究区下一步油气勘探部署提供了科学依据。

关键词: 页岩油气, 致密油气, 常规油气藏, 油气成因, 全油气系统, 成藏模式, 东濮凹陷, 渤海湾盆地

Abstract:

The Dongpu Sag represents a typical sedimentary sag of the saline lake facies. Presently, the hydrocarbon exploration in this sag is in a period of stagnation. By combining geological and geochemical methods, we systematically analyze the generation conditions, genetic mechanisms, and differential accumulation characteristics of hydrocarbons in this sag. The results indicate that the Dongpu Sag contains five suites of source rock sequences and four suites of evaporite sequences, exhibiting a structural framework characterized by multiple faults, uplifts, and sub-sags. The reservoirs in the sag feature significant heterogeneity and diverse hydrocarbon properties and genetic types, forming a large-scale whole petroleum system consisting of complete medium and shallow conventional hydrocarbon reservoirs, along with deep tight and shale hydrocarbon reservoirs with excellent accumulation conditions. Further investigation reveals that the properties and spatial distribution of hydrocarbons in the Dongpu Sag are governed by nine sub-sags, resulting in nine hydrocarbon types in three categories of sedimentary facies: saline, transitional, and freshwater facies in the northern, central, and southern parts, respectively. Accordingly, 11 hydrocarbon accumulation models are identified. The central uplift zone, or the intra-sub-sag uplift tectonic zone, in the salt-bearing area serves as the most hydrocarbon-enriched area, with conventional hydrocarbon reservoirs predominating. Based on the theory of the whole petroleum system, we establish a comprehensive hydrocarbon accumulation model subjected to varying dynamic fields and determine play fairways of conventional, tight, and shale hydrocarbons, thus laying a scientific basis for the future emplacement of hydrocarbon exploratory wells in the study area.

Key words: shale oil and gas, tight oil and gas, conventional hydrocarbon reservoir, hydrocarbon genesis, whole petroleum system, accumulation model, Dongpu Sag, Bohai Bay Basin

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