摘要
鄂尔多斯盆地古生代中央古隆起形成演化对该地区构造格局和油气勘探具有重要意义。通过对古生代构造背景、地层体残余厚度、奥陶系顶面构造演化等特征分析,刻画中央古隆起在不同沉积期构造演化特点,大体分为3个演化阶段:初始演化阶段:相对独立的中央古隆起形成于中晚寒武世;发育阶段:中央古隆起在早奥陶世马家沟期反映最为明显,为隆升剥蚀过程;调整、消亡阶段:石炭纪-二叠纪山西期古隆起仍有明显的显示,但其形态与位置均发生了较大变化,与马家沟期的中央古隆起有较大差别,为低缓隆起。晚二叠世以来不存在中央古隆起。中央古隆起对油气地质条件的控制作用体现在对沉积格局、残余生烃坳陷、储集条件、盖层圈闭条件及油气运聚等方面。
The tectonic evolution of the Paleozoic Central Paleouplift in Ordos Basin is reconstructed based on the comprehensive analyses of the stratigraphic thickness, tectonic evolution since Ordovician, and Paleozoic tectonic settings. Three major episodes of tectonic evolution can be recognized ： （1）the initiation stage, as demonstrated by the formation of the relatively independent Central Uplift in the Middle Cambrian; （2） the growth stage, the longterm extrusion and rising as exhibited by the occurrence of the Low Ordovician Majiagou Formation; and, （3） the adjustment and decay stage, in which the substantial vatiations of structural and tectonic settings of the Paleouplift that is evidenced by the occurrence of the Carboniferous Benxi Formation and Permian Shanxi Formation. The Cen- tral Paleouplift controls the oil and gas accumulation in the region because it influences the sedimentation proces- ses, formation of depression for hydrocarbon generation and accumulation, formation of caprock and traps, and thus the migration and storage of oil and gas.
出处
《大地构造与成矿学》
EI
CAS
CSCD
北大核心
2011年第2期190-197,共8页
Geotectonica et Metallogenia
基金
国家重点基础研究发展项目(973项目)(2003CB214601)资助
关键词
鄂尔多斯盆地
中央古隆起
形成演化
油气勘探
Ordos Basin
Paleozoic
central paleouplift
formation and tectonic evolution
oil and gas exploration
