摘要
准噶尔盆地非构造油气藏发现早、类型多、规模大、分布广、差异大,占已探明石油地质储量的76.1%,一直是新疆石油勘探开发的主要对象。已发现的非构造油气藏储集体成因类型主要包括4类:一是西北缘同生断阶陡坡带洪积扇砾岩、砂砾岩为储集层的断层-岩性及岩性-地层油气藏;二是准东断地近岸三角洲水下扇、浊积扇砂砾岩、砂岩为储集层的构造-岩性及岩性-地层油气藏;三是腹部古凸起控制的侏罗系-白垩系缓坡带河流-三角洲砂岩为储集层的构造-岩性及岩性-地层油气藏;四是海西运动期基底潜山风化壳油气藏。它们以上三叠统白碱滩组(黄山街组)盆地级区域盖层为界,划分为上、下两大成藏组合。下组合油气来源为自源、近源,其非构造油气藏形成主要是储集体岩相、物性、辅导体系3因素控制;上组合油气来源主要为二叠系远源及二叠系和侏罗系烃源的混源,其非构造油气藏的形成,主要受输导体系、构造背景、储集体岩相、圈闭及物性5因素控制。
Junggar basin is characterized by early discovery, multiple types, large scale, wide distribution and big differences of oil-gas reservoirs, accounting for 76.1% of proved OOIP. It has been playing a major target for petroleum exploration and development in Xinjiang region. For discovered non-structural reservoirs, their origin types mainly include： the fractured-lithologic and lithologic-stratigraphic reservoirs dominated by torrential fanglomerate and glutenite of steep slope in depositional fault bench in northwestern margin of Junggar basin, the structural-lithologic and lithologic-stratigraphic reservoirs by delta submarine fan, turbidite fan glutenite and sandstone in nearshore fault slope in Zhundong （east Junggar） area, the structural-lithologic and lithologic-stratigraphic reservoirs by fluvial-delta sandstone in Jurassic-Cretaceous gentle slope controlled by paleo-swell in hinterland of Junggar basin, and the buried-hill-weathered-crust reservoirs of Hercynian episode in basement of Junggar basin. The basin-scale regional cap rocks of Baijiantan formation （Huangshanjie formation） of Upper Triassic are their boundaries, and upper and lower reservoir assemblages can be divided. The lower assemblage contains hydrocarbon from self source and adjacent source, and its main factors of forming non-structural reservoir are lithofacies, petrophysical property and transport system. The upper assemblage has hydrocarbon sources mainly from Permian remote source and PermianJurassic mixed source, its primary control factors of shaping non-structural reservoir are transport system, tectonic setting, lithofacies, trap and petrophysical property.
出处
《新疆石油地质》
CAS
CSCD
北大核心
2005年第5期481-484,共4页
Xinjiang Petroleum Geology
