岩性油气藏 ›› 2023, Vol. 35 ›› Issue (6): 10–17.doi: 10.12108/yxyqc.20230602

• 地质勘探 • 上一篇    下一篇

东非海域大型深水沉积体系及油气成藏特征

史卜庆1, 丁梁波2, 马宏霞2, 孙辉2, 张颖2, 许小勇2, 王红平2, 范国章2   

  1. 1. 中国石油国际勘探开发有限公司, 北京 100034;
    2. 中国石油杭州地质研究院, 杭州 310023
  • 收稿日期:2023-06-19 修回日期:2023-07-20 出版日期:2023-11-01 发布日期:2023-11-07
  • 第一作者:史卜庆(1973—),男,博士,教授级高级工程师,主要从事石油地质及油气勘探方面的研究工作。地址:(100034)北京市海淀区学院路20号。Email:shiboqing@cnpcint.com。
  • 通信作者: 丁梁波(1982-),男,硕士,高级工程师,主要从事地震资料解释及油气勘探目标综合评价方面的研究工作。Email:dinglb_hz@pet-rochina.com.cn
  • 基金资助:
    中国石油天然气股份有限公司基础性前瞻性科技项目“海洋油气勘探关键技术研究”课题“海外深水、超深水油气勘探关键技术研究”(编号:2021DJ2403)资助

Characteristics of hydrocarbon accumulation in deep-water depositional system in offshore East Africa

SHI Buqing1, DING Liangbo2, MA Hongxia2, SUN Hui2, ZHANG Ying2, XU Xiaoyong2, WANG Hongping2, FAN Guozhang2   

  1. 1. China National Oil and Gas Exploration and Development Corporation, Beijing 100034, China;
    2. PetroChina Hangzhou Research Institute of Geology, Hangzhou 310023, China
  • Received:2023-06-19 Revised:2023-07-20 Online:2023-11-01 Published:2023-11-07

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摘要： 基于高品质三维地震和测井、录井等资料,对东非鲁伍马盆地古新统—渐新统深水沉积体系和赞比西坳陷上白垩统深水沉积体系特征进行了分析,并对二者的成藏条件进行了类比研究。研究结果表明:①鲁伍马盆地古新统—渐新统深水沉积体系中发育水道和朵体砂岩等大规模优质储层,等深流的改造作用是优质储层形成的关键因素。②赞比西坳陷上白垩统发育水道、朵体、块体搬运沉积等典型深水沉积,规模巨大的等深流漂积体多为优质储层。③赞比西坳陷主力烃源岩为下白垩统局限海相泥岩,油气生成后运移至邻近的上白垩统深水沉积砂体中,并被高位体系域深海泥岩封盖,深水砂岩上倾尖灭形成了岩性圈闭,具备良好的油气成藏条件,是未来油气勘探的有利区。

关键词: 深水沉积, 重力流, 等深流, 岩性圈闭, 白垩系, 赞比西坳陷, 鲁伍马盆地, 东非海域

Abstract: Using high quality 3D seismic and logging data,Paleocene-Oligocene deep-water depositional system in Rovuma Basin and Upper Cretaceous deep-water depositional system in Zambezi Depression were studied,and the hydrocarbon accumulation conditions of both deep-water depositional systems were compared. The results show that:（1）Channel and lobe sands are large-scale favorable reservoirs in Paleocene-Oligocene deepwater depositional system in Rovuma Basin,and the reconstruction of contour current is the key factor for the formation of high-quality reservoirs.（2）Typical deep-water deposits,such as channels,lobes,block transport deposits,are developed in Upper Cretaceous in Zambezi Depression,while large scale drifts possibly are highquality reservoirs.（3）A large amount of hydrocarbon was potentially accumulated in Upper Cretaceous deepwater sands in Zambezi Depression,which was generated from Lower Cretaceous shale of restricted marine environment. Reservoirs were capped by widely distributed HST shale,and lithologic traps could be assumed by up dip pinch-out. With good conditions for hydrocarbon accumulation,it is a favorable area for next oil and gas exploration.

Key words: deep-water sediments, gravity current, contour current, lithologic trap, Cretaceous, Zambezi Depression, Rovuma Basin, offshore East Africa

中图分类号: 

  • TE121.3
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