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群苦恰克构造带位于塔里木盆地西南坳陷麦盖提斜坡上倾部位,石炭系多个层段获商业性油气流及油气显示。分析该构造带4 口井( 西侧群5 井和曲3 井,原油主要来自奥陶系;东侧群4 井和曲1 井,原油主要来自石炭系) 产出的石炭系Ⅲ油组原油,其苯并咔唑绝对浓度和苯并[a] 咔唑/苯并[c] 咔唑的变化规律显示两种来源的原油运聚方向均为从东向西,与该构造带现今东高西低构造格局有矛盾。根据该构造带的演化史,石炭纪早期古巴什托普背斜已具雏形,二叠纪晚期西高东低的构造格局基本定型,晚第三纪受柯坪推覆体的影响才变为东高西低。源于奥陶系的原油运聚应发生在二叠纪晚期( 正是下古生界烃源岩生油高峰期) ,聚集于统一的古巴什托普背斜;晚第三纪构造格局变为东高西低后,发生源于石炭系原油的运聚,同时已聚集的源于奥陶系的原油进行从西向东的调整。因此,群苦恰克构造带的东部是油气勘探的有利地带。图2 表1 参4(王孝陵摘)
Qunchachak tectonic belt is located in the upwelling part of the Maigaiti slope in the southwestern depression of the Tarim Basin. Commercial oil-gas flow and oil and gas show in many layers of the Carboniferous. The results show that Carboniferous Ⅲ oil group crude oil produced from 4 wells in this structure (west side well 5 and Qu 3 well, with crude oil mainly from Ordovician, east side Qun 4 and Qu 1 wells and crude oil mainly from Carboniferous) , The absolute concentration of benzocarbazole and the variation of benzo [a] carbazole / benzo [c] carbazole show that the two sources of crude oil migrate from East to West, West low structure contradictions. According to the evolution history of the tectonic belt, the Early Carboniferous Shishopu anticline has been in embryonic form. The structural pattern of the western Permian and the lower East Permian in the Late Permian has been basically settled. In the Late Tertiary, the influence of the Keping pluton changed to the east High West low. The origin and accumulation of crude oil from the Ordovician should occur in the late Permian (which is the peak period of oil generation in the Lower Paleozoic source rocks) and converge on a uniform Cuban Storpe anticline. The pattern of Late Tertiary changes After the east and west are low, the migration and accumulation originate from the Carboniferous crude oil, and the collected crude oil from Ordovician undergoes the adjustment from west to east. Therefore, the eastern part of the Qunchachak tectonic belt is a favorable area for oil and gas exploration. Figure 2 Table 1 Senate 4 (Wang Xiaoling pick)