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天然气地球科学

• 天然气地质学 • 上一篇    下一篇

渤海海域天然气保存条件与分布特征

滕长宇，邹华耀，郝芳，王应斌，王奇   

  1. 1.中国石油大学(北京)油气资源与探测国家重点实验室，北京 102249；2.中国地质大学(武汉)构造与油气资源教育部重点实验室，湖北 武汉 430074；
    3.中海石油有限公司天津分公司，天津 300452
  • 收稿日期:2014-02-19 修回日期:2014-07-15 出版日期:2015-01-10 发布日期:2015-01-10
  • 作者简介:滕长宇（1985-），男，辽宁大连人，博士研究生，主要从事石油与天然成藏机理研究. E-mail：tengchangyu999@163.com.
  • 基金资助:

    国家自然科学基金(编号:41271265)|国家科技重大专项(编号:2011ZX05023-006-07)联合资助.

Preservation Condition and Occurrence of the Gas Pools in the Bohai Bay Area

TENG Chang-yu，ZOU Hua-yao，HAO Fang，WANG Ying-bin，WANG Qi   

  1. 1.State Key Laboratory of Petroleum Resource and Prospecting,China University of Petroleum,Beijing 102249,China;2.Key Laboratory of Tectonics and Petroleum Resources,Ministry of Education,China University of Geosciences,Wuhan 430074,China;3.Tianjin Branch of CNOOC Limited,Tianjin 300452,China
  • Received:2014-02-19 Revised:2014-07-15 Online:2015-01-10 Published:2015-01-10

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摘要：

渤海海域已发现了一系列的大中型油田，然而天然气的发现率较低。该区发育多套成熟烃源岩，具备形成大中型气田的气源条件，保存条件是该区天然气富集成藏的关键。该区天然气的保存主要受2个因素控制：①新构造运动期断层活动强度与盖层中断裂的发育密度|②盖层的厚度和盖储(排替+剩余)压力差。辽东湾地区新构造运动期断层发育密度小，活动强度弱，油气主要在古近系运聚成藏，又由于古近系气藏的盖储压力差较大、盖层封闭能力强，有利于天然气的保存，目前渤海海域储量最大的2个气田都分布于该区。渤中地区,通源断层活动强烈，大量的油气运移至新近系，使得现今新近系聚集了丰富的原油，但是由于新近系盖层中断层发育密集、盖储压力差小，封闭能力弱，天然气容易发生散失而难以形成商业聚集|然而古近系气藏盖储压力差较大，盖层封闭能力强，有利于天然气保存，目前在该区已发现6个储量数十亿方的天然气田。

关键词: 保存条件, 盖层, 新构造运动, 天然气, 渤海海域

Abstract:

A series of big-medium sized oil fields have been found in the Bohai Bay area,but the proved reserve of gas is very small.It developed multiple sets of mature source rocks,which are abundant enough for the formation of big-medium sized gas fields,thus preservation condition is a vital factor in the gas accumulation.Whether the gas could be preserved or not depends mainly on two key elements.They are(1)faulting intensity during the Neotectonism and density of the secondary faults in cap-rocks;(2)thickness of the cap-rocks and drops of the displacement pressures and overpressures between cap-rocks and reservoirs(DPCR).In the Liaodong Bay province,density and activity intensity of the faults developed during the Neotectonism are very little and DPCRs of the Paleogene reservoirs are very high,so the gas pools are well preserved in the Paleogene.Today,the two biggest gas fields in the Bohai Bay area just occur in the Liaodong Bay province.In contrast,in the Bozhong province,plenty of petroleum has migrated into the Neogene reservoirs through the intense activity faults.However,because of poor sealing property of the Neogene cap-rocks,most of the gas pools have suffered damage,whereas some of the pools in the Paleogene are preserved owing to the excellent Paleogene cap-rocks.So far,6 gas fields with reserves about several billion cubic meters have been found in the Paleogene of the Bozhong province.

Key words: Preserved condition, Cap-rock, Neotectonism, Gas, Bohai Bay area

中图分类号: 

  • TE122.1
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