岩性油气藏 ›› 2025, Vol. 37 ›› Issue (4): 136–146.doi: 10.12108/yxyqc.20250413

• 地质勘探 • 上一篇    

渤海湾盆地沧东凹陷深凹区古近系孔二段原油充注特征及成藏模式

陈家旭1, 陈长伟2, 刘国全1, 邹磊落1, 董晓伟1, 刘川2, 杨飞1, 钟巍1   

  1. 1. 中国石油大港油田公司 勘探开发研究院, 天津 300280;
    2. 中国石油大港油田公司, 天津 300280
  • 收稿日期:2025-01-17 修回日期:2025-02-21 发布日期:2025-07-05
  • 第一作者:陈家旭（1995-），男，博士，工程师，主要从事油气成藏方面的研究工作。地址：（300280）天津市滨海新区幸福路1278号。Email：chenjxu@petrochina.com.cn。
  • 基金资助:
    国家科技重大专项“渤海湾超级盆地油气富集规律与新领域勘探关键技术”（编号：2024ZD1400100）、中国石油天然气集团有限公司科技项目“陆相页岩油开发优化技术研究与试验”（编号：2023ZZ15YJ03）与中国石油大港油田公司博士后项目“黄骅坳陷深凹区控砂成储与成藏机理研究”（编号：博060）联合资助。

Crude oil filling characteristics and hydrocarbon accumulation model of the second member of Paleogene Kongdian Formation in the deep subsag zone of Cangdong Sag，Bohai Bay Basin

CHEN Jiaxu1, CHEN Changwei2, LIU Guoquan1, ZOU Leiluo1, DONG Xiaowei1, LIU Chuan2, YANG Fei1, ZHONG Wei1   

  1. 1. Exploration and Development Research Institute, PetroChina Dagang Oilfield Company, Tianjin 300280, China;
    2. PetroChina Dagang Oilfield Company, Tianjin 300280, China
  • Received:2025-01-17 Revised:2025-02-21 Published:2025-07-05

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摘要： 随着勘探能力的不断提高，渤海湾盆地沧东凹陷的勘探思路逐步从正向构造单元转向深凹区，下凹找油正在成为未来勘探趋势。通过对沧东凹陷深凹区古近系孔二段烃源岩的生烃演化，原油充注时间、充注强度和充注过程进行研究，探讨了沧东凹陷深凹区油气成藏模式。研究结果表明：①沧东凹陷深凹区孔二段储层原油母质以陆源有机质为主，沉积环境为还原性咸水湖盆，原油来源于孔二段烃源岩。②沧东凹陷深凹区孔二段烃源岩的大量生油期为孔一段沉积末期—东营组沉积期，孔二段储层中的原油发生大规模充注的时间为沙河街组沉积期，储层GOI（含油包裹体丰度指数）值多为60%～90%，压力系数为0.99～1.59。③沧东凹陷深凹区油气系统具有“地层埋藏速度快、烃源岩生烃时间早、原油充注强度大”的特征，在构造稳定和源储互层的背景下，原油以近源充注为主，利于形成大面积岩性油气藏。

关键词: 油源对比, 生烃模拟, 流体包裹体, 压力预测, 源储互层, 孔二段, 古近系, 深凹区, 沧东凹陷, 渤海湾盆地

Abstract: With the continuous improvement of exploration ，the exploration direction of Cangdong Sag in Bohai Bay Basin gradually convert from positive tectonic unit to the deep subsag zone，searching for oil reservoir in the deep subsag zone will be the trend for future exploration and development. Based on analysis of hydrocarbon generation evolution， such as crude oil filling time，filling intensity，and filling process of the source rocks in second member of Paleogene Kongdian Formation （Ek2）in the deep subsag zone of Cangdong Sag， hydrocarbon accumulation model in the deep subsag zone of the Cangdong Sag was discussed. The results show that： （1）The oil samples from the Ek2 reservoir in the subsag zone of Cangdong Sag mainly derived from terrigenous organic matter，deposited under brackish lacustrine with redox condition，and sourced from the Ek2 source rocks.（2）The Ek2 source rocks in the deep subsag zone of Cangdong Sag entered intense oil generation from the late Ek1 sedimentation to the sedimentary period of Dongying Formation.The large-scale crude oil filling period was the sedimentary period of Shahejie Formation. The GOI（oil inclusion abundance index）values of the Ek2 reservoir range from 60% to 90%，and the pressure coefficient of the reservoir was 0.99-1.59.（3）The hydrocarbon system in the deep subsag zone of Cangdong Sag is characterized by fast burial rate，early timings of hydrocarbon generation，and high intensity of crude oil injection. Under the background of stable tectonic and source-reservoir interbedded，crude oil is mainly injected from near source，which is conductive to the formation of large-scale lithologic reservoirs.

Key words: oil-source correlation, hydrocarbon generation simulation, fluid inclusion, pressure prediction, source-reservoir interbedded, the second member of Kongdian Formation, Paleogene, deep subsag zone, Cangdong Sag, Bohai Bay Basin

中图分类号: 

  • TE122.1
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