乍得Bongor反转裂谷盆地中生界剥蚀厚度恢复及勘探启示
Mesozoic erosion thickness restoration and its implication to exploration in Bongor inverted rift basin, Chad
余朝华 1肖坤叶 1肖高杰 2张桂林 1袁志云 1胡瑛 1杜业波1
作者信息
- 1. 中国石油勘探开发研究院，北京100083
- 2. 中国石油勘探开发研究院，北京100083; 中国地质大学 北京 地球科学与资源学院，北京100083
- 折叠
摘要
综合利用泥岩声波时差法、镜质组反射率（Ro）法和地层对比法对Bongor盆地中生界剥蚀厚度进行了恢复，恢复结果表明Bongor盆地中生界的剥蚀厚度在1000～2000m之间，呈现出南北大、中间小的特征。快速而剧烈的抬升剥蚀使得该盆地下成藏组合P组砂体的储集能力得以保存；反转期的挤压应力导致了盆地地层的褶皱变形，形成了一系列断背斜、断鼻构造，为油气成藏提供了良好的圈闭条件；反转引起的断层活化为Bongor盆地中油气的运移提供了通道。
Abstract
Mesozoic erosion thickness of Bongor Basin was restored using mudstone acoustic time difference method, vitrinite relfectance (Ro) method, and stratigraphic correlation method. Result showed that the erosion thickness ranged from 1000 to 2000 m, thick in northern and southern slope while thin in central sag. The quick but intense uplift preserved the good reservoir quality of the P Formation sand body in the lower play. The compressive stress during inversion folded the strata and contributed to the formation of a lot of faulted anticlines and noses which were excellent traps for hydrocarbon accumulation. The fault reactivation triggered by inversion promoted the hydrocarbon migration in Bongor Basin.
关键词
反转盆地/剥蚀厚度/油气聚集/Bongor盆地/乍得Key words
inverted basin/erosion thickness/hydrocarbon accumulation/Bongor Basin/Chad引用本文复制引用
基金项目
国家重大科技专项项目(2011ZX05029-001)
中国石油勘探开发研究院项目(2012Y-056)
出版年
2013
NETL
NSTL
维普
万方数据