石油学报 ›› 2019, Vol. 40 ›› Issue (s1): 41-52.DOI: 10.7623/syxb2019S1004

• 地质勘探 • 上一篇    下一篇

珠江口盆地陆丰凹陷古近系与新近系油气富集规律的差异及其主控因素

代一丁1, 牛子铖2, 汪旭东1, 王小龙3, 肖张波1, 张凯迪2, 赵璇2   

  1. 1. 中海石油(中国)有限公司深圳分公司 广东深圳 518000;
    2. 中国石油大学(北京) 地球科学学院 油气资源与探测国家重点实验室 北京 102249;
    3. 中国石油长庆油田公司第四采油厂 宁夏银川 750000
  • 收稿日期:2018-08-01 修回日期:2019-04-22 出版日期:2019-07-25 发布日期:2019-07-15
  • 通讯作者: 牛子铖,男,1989年11月生,2012年获吉林大学资源勘查工程专业学士学位,2018年获中国石油大学(北京)地质资源与地质工程专业博士学位,现为中国石油化工股份有限公司胜利油田管理局博士后,主要从事油气地球化学方面的研究。Email:zichengniu@163.com
  • 作者简介:代一丁,男,1963年7月生,1984年获西南石油学院学士学位,现在为中海石油(中国)有限公司深圳分公司勘探部经理、教授级高级工程师,主要从事石油地质及油气勘探综合研究工作。Email:daiyd@cnooc.com.cn
  • 基金资助:

    中海石油(中国)有限公司综合科研项目(CCL2015SZPS0268)资助。

Differences of hydrocarbon enrichment regularities and their main controlling factors between Paleogene and Neogene in Lufeng sag,Pearl River Mouth Basin

Dai Yiding1, Niu Zicheng2, Wang Xudong1, Wang Xiaolong3, Xiao Zhangbo1, Zhang Kaidi2, Zhao Xuan2   

  1. 1. Shenzhen Branch of CNOOC China Limited, Guangdong Shenzhen 518000, China;
    2. College of Geoscience, China University of Petroleum;State Key Laboratory of Petroleum Resource and Prospecting, Beijing 102249, China;
    3. The Fourth Oil Production Plant, PetroChina Changqing Oilfield Company, Ningxia Yinchuan 750000
  • Received:2018-08-01 Revised:2019-04-22 Online:2019-07-25 Published:2019-07-15

摘要:

珠江口盆地陆丰凹陷同时发育古近系文昌组油藏、恩平组油藏和新近系珠江组油藏,不同层系表现出不同的油气富集规律。在古近纪强烈裂陷阶段形成的文昌组深湖相泥岩具有厚度大、有机质丰度高的特点,是陆丰凹陷油气的主要来源。古近系油藏埋深较大,主要分布在洼陷斜坡和洼中隆起位置;新近系油藏埋深较浅,主要分布在远离洼陷的凸起带。古近系储层主要为湖相三角洲成因,埋深较大,物性相对较差;新近系储层主要为海相沉积,埋深较浅,物性相对较好。新近系圈闭的形成主要受构造控制,发育背斜和断背斜圈闭;古近系圈闭的形成往往受构造和岩性共同控制。包裹体分析表明,不同含油层系具有不同的成藏时间,文昌组、恩平组和珠江组分别在12 Ma、11 Ma和9 Ma成藏。古近系油藏和新近系油藏具有不同的运移输导特征,砂体和断裂的组合构成了多种输导模式。古近系油藏具有近源运聚成藏的特征,以短距离的砂体侧向输导和断裂垂向输导为主;而新近系油藏表现为远源运聚成藏的特征,砂体和控洼断裂构成复合运移通道。不同的油气富集规律导致古近系和新近系油藏具有不同的成藏主控因素。其中,文昌组油藏主要受控于储层发育特征,恩平组油藏主要受控于储-盖组合,而珠江组油藏主要受控于圈闭发育条件。

关键词: 珠江口盆地, 陆丰凹陷, 成藏时间, 输导模式, 主控因素

Abstract:

The reservoirs in Paleogene Wenchang Formation, Enping Formation and Neogene Zhujiang Formation are simultaneously developed in Lufeng sag of Pearl River Mouth Basin, and different layers show different oil and gas enrichment regularities. The deep lacustrine mudstone of Wenchang Formation was formed in the Paleogene intense rift stage, characterized by great thickness and high abundance of organic matter, as the main source of oil and gas in Lufeng sag. The Paleogene reservoir had a deep burial depth, mainly distributed on the slope and in the central uplift of subsag. The Neogene reservoir had a shallow burial depth, mainly distributed in the uplift area away from the subsag. The Paleogene reservoirs were mainly sourced from the lacustrine delta with deep burial depth and relatively poor physical properties. The Neogene reservoirs were dominated by marine sediments with shallow burial depth and relatively good physical properties. The formation of Neogene traps was mainly controlled by geological structures; anticline and fault anticline traps were developed. The formation of Paleogene traps was often controlled by geological structures and lithologies. The fluid inclusion analysis showed that different oil-bearing strata had different accumulation time, and Wenchang Formation, Enping Formation and Zhujiang Formation were formed at 12 Ma, 11 Ma and 9 Ma respectively. The Paleogene and the Neogene reservoirs had different migration and transport characteristics, and the combination of sand bodies and faults constitutes multiple transport modes. The Paleogene reservoirs were characterized by near-source transport and accumulation, especially short-distance sand-body lateral transport and vertical fault transport, while the Neogene reservoirs are characterized by far-source transport and accumulation. The sand body and subsag-controlling fault constitute composite migration channels. The differences in oil and gas enrichment regularities lead to different main controlling factors of hydrocarbon accumulation in the Paleogene and Neogene reservoirs. Thereinto, the reservoirs of Wenchang Formation, Enping Formation and Zhujiang Formation are mainly controlled by reservoir development characteristics, reservoir-cap combination, and trap development conditions, respectively.

Key words: Pearl River Mouth Basin, Lufeng sag, hydrocarbon accumulation time, migration patterns, main controlling factors

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