地质科技情报2017，Vol.36Issue(5)：102-111,10.DOI:10.19509/j.cnki.dzkq.2017.0514
西非下刚果盆地Madingo组烃源岩地球物理综合评价
Geophysical Comprehensive Evaluation of Hydrocarbon Source Rocks of the Madingo Formation in the Lower Congo Basin, West Africa
摘要
Abstract
The marine hydrocarbon source rocks of the Madingo Formation in the Lower Congo Basin develop in the period of rapid rise in sea level.The deposition rate of this formation is extremely slow,and the sedimentary thickness is thin,corresponding with a long span of the deposition time.Madingo Formation belongs to a typical condensed section.In order to evaluate the quality of Madingo source rocks in vertical and horizontal directions,we used delta lgR technology and GR curve cycle analysis method successively,combining the methods of seismic facies and geochemistry.By using the delta lgR method,we analysed the acoustic and resistivity log and geochemistry of hydrocarbon source rocks TOC values by multiple linear regression model,and then obtained the calculation model of Madingo source rock TOC.Addionanally,by means of GR curve cycle analysis method,we evaluated the source rocks of the Lower Congo Basin under the framework of sequence stratigraphy theory,through the transgressive/regressive cycle division and the recognition of condensed section.The delta lgR analysisshows that the middle and upper section of the Madingo Formation is an organic enrichment section.The GR curve cycle analysis shows that the development stage of the hydrocarbon source rocks of Madingo Formation in the Lower Congo Basin correspondswell to organic blooming period and the maximum flooding period,with three sections of the rich organic silicon mixed fine-grained facies,belonging to rich organic section.The seismic facies and geochemistry research reveals that the thickness of effective source rock is 200-600 m,and most typical types of the kerogen are type Ⅰ and Ⅱ1,tending to generate oil.Overall,the Madingo Formation in the Lower Congo Basin developed good or excellent hydrocarbon source rocks.关键词
下刚果盆地/Madingo组/烃源岩评价/ΔlgR技术分析/GR曲线旋回分析法Key words
Lower Congo Basin/Madingo Formation/evaluation of hydrocarbon source rock/delta lgR technology/GR curve cycle analysis method分类
地质学引用本文复制引用
黄兴,杨香华,朱红涛,邓运华,康洪全,王波,黄众,张璐..西非下刚果盆地Madingo组烃源岩地球物理综合评价[J].地质科技情报,2017,36(5):102-111,10.基金项目
“十三五”国家油气专项子课题“西非—南美海域重点区油气地质评价及关键技术”(2016ZX05032-001) （2016ZX05032-001）
