石油学报 ›› 2016, Vol. 37 ›› Issue (11): 1370-1380,1434.DOI: 10.7623/syxb201611005

• 地质勘探 • 上一篇    下一篇

渤海海域基底“改造型火山机构”特征及油气成藏意义

叶涛, 韦阿娟, 祝春荣, 王粤川, 高坤顺, 曾金昌   

  1. 中海石油(中国)有限公司天津分公司 天津 300452
  • 收稿日期:2016-03-10 修回日期:2016-09-02 出版日期:2016-11-25 发布日期:2016-12-10
  • 通讯作者: 叶涛,男,1987年9月生,2010年获长江大学学士学位,2013年获中国石油大学(华东)硕士学位,现为中海石油(中国)有限公司天津分公司工程师,主要从事油气勘探综合研究。Email:yetao2@cnooc.com.cn
  • 作者简介:叶涛,男,1987年9月生,2010年获长江大学学士学位,2013年获中国石油大学(华东)硕士学位,现为中海石油(中国)有限公司天津分公司工程师,主要从事油气勘探综合研究。Email:yetao2@cnooc.com.cn
  • 基金资助:

    国家重大科技专项“渤海大中型油气田地质特征”(2011ZX05023-006-002)资助。

Characteristics and hydrocarbon accumulation significance of reformed volcanic edifice in the basement of Bohai Sea

Ye Tao, Wei Ajuan, Zhu Chunrong, Wang Yuechuan, Gao Kunshun, Zeng Jinchang   

  1. Tianjin Branch, CNOOC China Limited, Tianjin 300452, China
  • Received:2016-03-10 Revised:2016-09-02 Online:2016-11-25 Published:2016-12-10

摘要:

定义渤海海域中生代义县组沉积期侵位定型的完整火山机构遭受改造后的残留体为基底“改造型火山机构”。以研究区大量的钻井、地震、测井以及薄片资料为基础,探讨了基底“改造型火山机构”特征及其控油气作用。结果表明,基底“改造型火山机构”主要受岩浆性质、古地貌以及后期改造共同控制,后期断裂切割与差异剥蚀是火山机构改造的主要形式;研究区火山岩发育强与弱两种喷发模式,均属于“反序式”喷发,其中爆发相与中、酸性溢流相为优质储集相带;风化、旋回、期次界面控制优质岩相的垂向展布,各级次界面与残存优质岩相耦合是油气富集的关键。在风化壳或喷发界面150 m以内,同时优质岩相残存的火山机构中寻找期次界面是此类火山岩勘探的重点。

关键词: 渤海海域, 中生界, 改造型火山机构, 火山岩相, 风化界面, 油气富集

Abstract:

The residual body of the reformed intact volcanic edifice that was finally formed after emplacement during the depositional stage of Yixian Formation in Mesozoic in the Bohai Sea is defined as a basement reformed volcanic edifice. Based on plenty of drilling, seismic, well logging and thin section data in the study area, this paper discusses the characteristics and oil-gas control effect of the basement reformed volcanic edifice. The results indicate that the basement reformed volcanic edifice is mainly controlled by magmatic property, ancient landform and later reformation, and late fault cut and differential erosion are the main forms of volcanic edifice reformation; volcanic rocks in the study area show strong and weak eruption patterns, belonging to inverted-sequence eruptions, in which explosive facies and intermediate-acidic or acidic effusive facies constitute the excellent reservoir facies belt; weathering, cycles and stage boundaries control the vertical distribution of high-quality lithofacies, and the coupling between each boundary at different levels and residual high-quality lithofacies is the key to oil and gas enrichment. During exploration of these volcanic rocks, a key task is to find the stage boundaries in the volcanic edifice with residual high-quality lithofacies within 150 m from the weathering crust or eruption surface.

Key words: Bohai Sea, Mesozoic, reformed volcanic edifice, volcanic facies, weathering surface, oil and gas enrichment

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