准噶尔盆地北三台地区不整合与油气成藏

Unconformities and Hydrocarbon Accumulation in Beisantai Area,Junggar Basin

准噶尔盆地北三台地区发育多个不整合面,根据其成因机制、剖面形态等,可划分为削截不整合、超覆不整合、断褶不整合和平行不整合4种类型。风化剥蚀程度的不均一性使不整合具有典型的层状结构,包括底砾岩及水进砂体、风化粘土层及半风化淋滤带。不整合的类型控制着不整合面的倾角与交汇程度,进而控制了油气的运移及成藏模式。

There exist multiple unconformities developed in Beisantai area of Junggar basin.They can be divided into truncation unconfor-mity,onlap unconformity,fault-fold unconformity and parallel unconformity in terms of their forming mechanisms and sec tion configura-tions.They are of typical laminar textures due to uneven weathering and denudation processes,including basal con glomerate,transgres-sive sand body,weathered claystone and semi-weathering leached zone.It is such unconformable types that control the dips and inter-secting extent of unconformities,followed by controlling the hydrocarbon migration and patterns of hydro carbon accumulation here.