HYDROCARBON ACCUMULATION PATTERN AND TYPE IN THE SOUTHERN JUNGGAR FORELAND BASIN
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摘要: 以准南前陆盆地的烃源岩演化和油气成藏期次为依据,划分出中二叠统、中下侏罗统、下白垩统和下第三系安集海河组等4套含油气系统.通过对区域构造演化特征、构造类型和油藏特征的分析,认为该区油气藏类型主要为压扭背斜油气藏和背斜—岩性油气藏,其次为断层遮挡背斜油气藏.综合准南前陆盆地构造特征、油气成藏条件及主控因素等,建立了该区中、东、西段3个油气聚集区带的成藏模式:西段油气成藏多为逆冲断裂带—不整合面单向充注型;中部地区多为断层封闭—多向充注型;东段地区多为逆冲背斜带单向充注和断层遮挡单向充注型.Abstract: There are 4 sets of petroleum systems in the southern Junggar Foreland Basin:Middle Permian,Middle-Lower Jurassic,Lower Cretaceous and Anjihaihe Formation of Lower Tertiary,defined by source rock evolution and reservoir forming period.Regional tectonic evolution characteristics,tectonic types and reservoir features indicate that,main reservoir types in this region include compaction-wrench anticline and anticline-lithologic ones,and fault-screened anticlinal ones take the second position.Based on studies of tectonic characteristics,reservoir forming condition and main controlling factors,accumulation patterns of 3 accumulation zones are set up:accumulations in the west are characterized by thrust rupture belt and unconformities with one-way injection;accumulations in the center are characterized by fault-screened hydrocarbon accumulation with multi-direction injection;and accumulations in the east are characterized by thrust anticline and fault-screened hydrocarbon accumulation with one-way injection.
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