西安石油大学学报(自然科学版)2012,Vol.27Issue(5):27-31,5.
尼日尔三角洲盆地海陆过渡区油气成藏规律
Study on hydrocarbon accumulation of the sea-onshore transitional zone in Niger Delta Basin
摘要
Abstract
According to the comprehensive analysis of regional hydrocarbon geological features,hydrocarbon accumulation law and main control factors of hydrocarbon accumulation in the sea-onshore transitional zone,it is held that Niger Delta Basin is a typical pas-sive continental margin basin, which was developing with the disintegration of the ancient Gondwana continent and the expansion of the Atlantic. Its development includes two main evolution periods,the rifting period from the late stage of early Cretaceous to Santo stage of late Cretaceous and the following drifting period since Campanian of late Cretaceous. Cenozoic delta is the main part of the basin,and its biggest depositional thickness is about 12 km. The deposit includes three diachronic lithostratigraphic units of Akata Formation, Agbada Formation and Benin Formation, Akata Formation in the lower is mainly the prodelta of continental shelf and continental slope and the thick shallow-deep marine mud shale,which is the main hydrocarbon source rock in the studied area, Agbada Formation in the middle mainly includes the delta front sand and submarine fan sandbodies, which is the regional reservoir. Benin Formation on the top is the continental fluvial deposit and swamp depositi which is the main regional cap rock. The plastic mudstone layer in Akata Formation is characterized flow structure, which will cause that overlying strata, such as Agbada Formation, developed gravity structures. And the structural style presents obvious zonality,and large extensional tectonics developed in land and shallow sea zone. Regional growth faults developed in the studied area, by which the tectonic framework and the trap style controlled are main control factors of the hydrocarbon accumulation.关键词
尼日尔三角洲盆地/海陆过渡区/油气成藏/伸展构造/生长断层Key words
Niger Delta Basin/sea-land transitional zone/hydrocarbon accumulation/extension tectonic/growth fault分类
能源科技引用本文复制引用
刘喜玲,于水,陶维祥,韩文明,范洪耀..尼日尔三角洲盆地海陆过渡区油气成藏规律[J].西安石油大学学报(自然科学版),2012,27(5):27-31,5.基金项目
国家科技重大专项项目(编号:2011ZX05030-003) (编号:2011ZX05030-003)