石油学报 ›› 2015, Vol. 36 ›› Issue (3): 253-261.DOI: 10.7623/syxb201503001

• 地质勘探 •    下一篇

渤海大中型潜山油气田形成机理与勘探实践

邓运华   

  1. 中国海洋石油总公司 北京 100028
  • 收稿日期:2014-10-20 修回日期:2015-01-22 出版日期:2015-03-25 发布日期:2015-03-11
  • 作者简介:邓运华,男,1963年2月生,1985年获江汉石油学院学士学位,1988年获北京石油勘探开发研究院硕士学位,现任中国海洋石油总公司副总地质师兼中海油研究总院副院长、教授级高级工程师,长期从事海上油气勘探研究和技术管理工作。Email:dengyh@cnooc.com.cn
  • 基金资助:

    国家重大科技专项"近海富烃凹陷资源潜力再评价和新区、新领域勘探方向"(2011ZX05023-001)资助

Formation mechanism and exploration practice of large-medium buried-hill oil fields in Bohai Sea

Deng Yunhua   

  1. China National Offshore Oil Corporation, Beijing 100028, China
  • Received:2014-10-20 Revised:2015-01-22 Online:2015-03-25 Published:2015-03-11

摘要:

渤海潜山油气田的勘探经历了较长的探索过程。20世纪70—90年代,借鉴中国东部陆地油区潜山油气藏勘探经验,在渤海寻找碳酸盐岩潜山大油气田,钻了很多探井,效果很差。在失利后进行了深入的反思分析,认识到渤海有其独特的潜山地质特征,例如渤海油区凸起上的基岩以太古代、元古代及中生代的花岗岩、混合花岗岩为主,下古生界碳酸盐岩较少,最利于形成潜山大油气田的上元古界藻屑白云岩在渤海不发育;渤海油区断层很多,晚期活动非常强,按照常规经验,渤海潜山储层及保存条件都差,不利于形成潜山大油气田。在长期实践中,经过深入分析,发现花岗岩、混合花岗岩与密集的基岩断层耦合也可形成潜山好储层,取心收获率低,测试产量高;利用地球物理信息可准确预测基岩岩性与断层。临近富烃凹陷的低凸起上的残丘潜山被浅湖—半深湖相泥岩覆盖,利于形成潜山油气藏。在一系列创新认识的指导下,再探渤海潜山,发现了2个亿吨级花岗岩潜山油气田,其认识和实践过程在其他探区具有一定借鉴意义。

关键词: 潜山, 花岗岩, 油气田, 形成机理, 勘探实践, 渤海

Abstract:

The buried-hill oil fields in Bohai Sea have experienced a long period of exploration. From 1970s to 1990s, many boreholes were drilled referring to the exploration experiences of buried-oil reservoirs in onshore oil fields of eastern China, but few was successful in discovering large carbonate buried-hill oil and gas fields in Bohai Sea. Due to these failures, geologists reconsidered their strategies and finally recognized that Bohai Sea has unique geological characteristics of buried hill. For example, the bedrocks on the uplifts of Bohai oil province mainly consist of Archean, Proterozoic and Mesozoic granites, migmatitic granites, and less Lower Paleozoic carbonates. However, the Proterozoic algal dolomite best favorable to the formation of large buried-hill oil and gas fields is not developed in Bohai Sea. There are a large number of faults in Bohai oil province with intensive activities in the late period. According to conventional experience, the buried-hill reservoir and preservation conditions are poor in Bohai Sea, which is not beneficial for the formation of large buried-hill oil and gas fields. Through long-term practices and deep analyses, the coupling between granites, migmatitic granites and intensive bedrock faults is also found to be available for the formation of favorable buried-hill reservoirs with low core recovery rate and high test production. Geophysical data can be used for accurately predicting bedrock lithology and faults. The monadnock buried hills on the low uplifts adjacent to hydrocarbon-rich depressions are covered by shallow to semi-deep lacustrine shale, favorable for the formation of buried-hill oil and gas reservoirs. Under the guidance of innovative understandings for the exploration of buried-hills in Bohai Sea, two largest granite buried-hill oil and gas fields with 100 million tons of reserves were discovered in China, and its recognition-practice process is of great reference significance to other exploration areas.

Key words: buried hill, granite, oil and gas fields, formation mechanism, exploration practice, Bohai Sea

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