莺歌海盆地海底麻坑的形成与泥底辟发育和流体活动的关系*

doi:10.11978/j.issn.1009-5470.2012.05.005

热带海洋学报 ›› 2012, Vol. 31 ›› Issue (5): 26-36.doi: 10.11978/j.issn.1009-5470.2012.05.005cstr: 32234.14.j.issn.1009-5470.2012.05.005

莺歌海盆地海底麻坑的形成与泥底辟发育和流体活动的关系*

邸鹏飞1, 黄华谷2, 黄保家3, 何家雄2, 陈多福1,2

1. 中国科学院边缘海地质重点实验室, 中国科学院南海海洋研究所, 广东广州 510301; 2. 中国科学院边缘海地质重点实验室, 广州地球化学研究所, 广东广州 510640; 3. 中海石油(中国)湛江分公司, 广东湛江 524057

收稿日期:2011-08-30 修回日期:2012-01-10 出版日期:2012-11-01 发布日期:2013-02-06
通讯作者: 陈多福(1962—), 男, 江苏省苏州市人, 研究员, 博士生导师, 主要从事冷泉和天然气水合物研究。E-mail: cdf@gig.ac.cn。
作者简介:邸鹏飞(1982—), 男, 河北省保定市人, 助理研究员, 海洋地质与石油地质方向, 主要从事海底冷泉及天然气水合物研究。
基金资助:
基金项目:中国科学院海洋地质与环境重点实验室开放基金资助项目(MGE2012KG08); 中国科学院知识创新工程青年人才领域前沿项目资助(SQ201110); 国家海洋局海底科学重点实验室开放基金资助(KLSG1204); 国家自然基金项目(91228206)

Seabed pockmark formation associated with mud diapir development and fluid activities in the Yinggehai Basin of the South China Sea

DI Peng-fei1 , HUANG Hua-gu2 , HUANG Bao-jia3 , HE Jia-xiong2 , CHEN Duo-fu1, 2

1.Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301 China; 2.Key Laboratory of Marginal Sea Geology, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, China 510640; 3. China National Offshore Oil Corporation Ltd., Zhanjiang 524057, China

Received:2011-08-30 Revised:2012-01-10 Online:2012-11-01 Published:2013-02-06

摘要/Abstract

摘要： 麻坑作为海底冷泉流体活动的标志, 普遍分布于莺歌海盆地中央坳陷区和莺东斜坡带。莺歌海盆地单个麻坑面积5×8—24×26m², 坑深一般在0.5—6.7m之间, 形状为圆形或椭圆形, 个别为长条状, 最大的面积达300×580m², 坑深为117m。麻坑的形成与泥底辟多期次活动和气藏中天然气等流体的向上运移和喷发有关。麻坑发育区常伴有泥火山形成。地震剖面上有古麻坑(被掩埋的麻坑)的发育, 表明历史时期曾发生过冷泉流体的喷发。在同一渗漏通道内由同一泥底辟形成的2次麻坑表明历史时期发生了2次间歇性的泥底辟上侵活动。依据莺歌海盆地麻坑深度, 估计向上渗漏导致麻坑形成的深部气藏中的游离气层厚约16—94m。

关键词: 麻坑, 泥底辟, 莺歌海盆地, 游离气渗漏

Abstract: Pockmarks, as a sign of gas and fluid seepage on the seafloor, are widely distributed around the center depression and Yingdong Slope area of the Yinggehai Basin. The area of a single pockmark may range from 24×26 to 5×8 m², its depth may be between 0.5 and 6.7 m, and its shape is approximately circular or elliptical, with a few of them being long strips. The largest one is 300×580 m², and its depth is 117 m. The pockmark formation correlates with the multiple-stage activity of mud diapirs and the upward migration and eruption of free gases and fluids from the gas reservoir. The pockmarks are usually accompanied with the formation of mud volcano. Paleo-pockmarks (the buried pockmarks) have been discovered along seismic profiles, which indicates that the free gas and the fluid eruption took place in a historical period. The two times of pockmark activity in an identical seepage channel show that the upward intrusion of mud diapir took place intermittently. According to the depth of pockmarks, it is estimated that a 16- to 94-m-thick free gas layer upward venting in the deep gas reservoir is needed to form a 0.5- to 6.7-m-deep pockmark in the Yinggehai Basin.

Key words: pockmark, mud diapir, Yinggehai Basin, free gas seepage

中图分类号:

P618.13

邸鹏飞,黄华谷,黄保家,何家雄,陈多福,. 莺歌海盆地海底麻坑的形成与泥底辟发育和流体活动的关系*[J]. 热带海洋学报, 2012, 31(5): 26-36.

DI Peng-fei,HUANG Hua-gu,HUANG Bao-jia,HE Jia-xiong,CHEN Duo-fu,. Seabed pockmark formation associated with mud diapir development and fluid activities in the Yinggehai Basin of the South China Sea[J]. Journal of Tropical Oceanography, 2012, 31(5): 26-36.

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莺歌海盆地海底麻坑的形成与泥底辟发育和流体活动的关系*

Seabed pockmark formation associated with mud diapir development and fluid activities in the Yinggehai Basin of the South China Sea

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