乍得B区岩性油藏特征及成藏条件分析

文章摘要

乍得B区岩性油藏特征及成藏条件分析

Analysis on lithological reservoir features and formation conditions in B block ,Chad

投稿时间：2018-03-21 修订日期：2018-03-21

DOI：

中文关键词: 乍得 Bongor盆地 B区块岩性油藏特征成藏条件

英文关键词: Chad Bongor basin B block Lithological reservoir features Reservoir formation conditions

基金项目:国家科技重大专项课题“海外重点风险项目勘探综合配套技术”(2011ZX05029-001),课题主持人：窦立荣

作者	单位	邮编
华夏^*	中国石油长城钻探工程有限公司	124010

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中文摘要:

针对乍得B区块开发程度逐步提高的现状,为尽快在Bongor盆地其它地区获得勘探发现以实现产量接替,综合利用地球物理、钻录井、岩心分析、测试和开发动态资料对B油藏特征进行详细解剖,以油气成藏理论为指导分析其成藏必要条件。研究结果表明：B区块储层为盆地北斜坡带单向扇三角洲沉积体系,物性受沉积条件影响表现为近源端好,远源部位差的特点,油藏内部油水分布差异化明显,且以岩性油藏为主,自凹陷向凸起含油程度降低,结合地化资料和盆地分析研究成果认为该区块是以下成藏组合为主要含油层系的油藏,裂陷期的沉积演化形成了油气成藏的物质基础,后期区域构造反转促进油气的运移,并改造了油藏形态。该研究揭示了乍得Bongor盆地北部斜坡带多个凹陷的形成发育规律,可对盆地内其它类似的油藏勘探提供借鉴。

英文摘要:

Aiming at the problem about gradually improving level of exploitation in B block, Bongor basin. We use seismic,drilling,logging,core analysis ,test and exploitation data to study reservoir features in detail and analyze necessary reservoir formation conditions of B reservoir for exploration breakthrough in other areas to replace production, based on reservoir formation theories.The study results show that the reservoir rock of B block is fan delta depositional system with single direction in northern ramp region.Physical property manifests good near provenance,the distribution of oil and water has distinct difference in reservoir internal,and the main reservoir type is lithological reservoir,the oiliness level reduces from sag to heave,the result of basin analysis make clear that the main oil-bearing series of B block is lower reservoir composition formation,the material basis of reservoir formation shaped up on account of sedimentary evolution in rifting period, late tectonic inversion accelerated HC migration and transformed reservoir pattern.These research results reveal forming and growth rule of many sags in northern ramp region, Bongor basin,they can draw lessons to exploration of other similar reservoirs intra-basin.

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