鄂尔多斯盆地3条油藏大剖面对风险勘探的意义

鄂尔多斯盆地大致经历了6个演化阶段,主要发育3套烃源岩、2条不整合面及多套储盖组合,形成以下古生界奥陶系气藏、上古生界石炭-二叠系气藏、中生界三叠系-侏罗系油藏为代表的3大含油气系统.深入分析盆地内部3条油气藏连井剖面(吴忠-米脂;固原-宜川;包头-澄城)可知:烃源岩控制油气藏的规模与展布;中生界油藏位于生烃坳陷内部或...

The significance of three reservoir profiles to risk exploration in Ordos Basin

The Ordos Basin went through six main stages of geological evolution, developed three sets of soure rocks, two unconformities, several sets of reservoirs and caprocks, and had three typical petroleum systems, i.e. Lower Paleozoic Ordovician gas reservoirs, Upper Paleozoic Carboniferous-Permian gas reservoirs, and Mesozoic Triassic-Jurassic oil reservoirs. Three well profiles of oil and gas reservoirs in the basin are analyzed, which are the Wuzhong-Mizhi profile, Guyuan-Yichuan profile, and Baotou-Chengcheng profile. The size and distribution of the oil and gas reservoirs are controlled by the spatial distribution of soure rocks. Mesozoic oil reservoirs are located inside or near hydrocarbon depressions, where oil and gas had a short secondary migration. Paleozoic gas in the basin, after having a large-scale short migration in the range of source rocks, eventually gathered in the effective traps of the Ordovician weathering crust, and in the low permeability effective sand traps inside or near Carboniferous-Permian source rocks. The future risk exploration targets are: (1) for Mesozoic oil exploration, it will extend northward and explore unconventional reservoirs in source rocks; (2) for Upper Paleozoic gas exploration, it will extend southward and explore marine clastic gas reserviors; (3) for Lower Paleozoic gas exploration, it will search for lithologic-structural traps of carbonate weathering crust in the north-central and southeastern Yishan slope and those of carbonate reef flat.