准噶尔盆地中部1区块侏罗系三工河组油气输导特征分析

Characteristics of hydrocarbon pathway system of Sangonghe formation in block of Z1,Junggar basin

分析准噶尔盆地中部1区块侏罗系三工河组油藏输导格架构成及输导特征对油气分布的控制机制.研究区内砂岩输导层包括J1s12输导层及J1b1输导层,对2套输导层的分布及成因类型进行综合评价,认为J1s12砂体为区内主要输导层;将区内断裂体系划分为深层油源断裂与浅层层间断裂,前者是油气垂向输导的最主要通道,后者是油气向圈闭聚集的重要通道.结果表明:现今构造格局不是准中1区块岩性油气藏成藏控制因素,成藏期主要输导层J1s12古构造脊控制油气运移方向,油源断裂沟通的圈闭及输导层古构造脊上与层间断层沟通的圈闭是油气聚集的主要场所.

The framework of hydrocarbon pathway system and its control mechanisms of the distribution of oil pool are probed in this paper.Analyses demonstrate that there are two carriers in Lower Jurassic J1s12 and J1b1,we point out that the sand of J1s12 is the dominant carrier based on evaluations of its distribution and genetic type.Faults in work area can be divided into two kinds: direct oil source faults and indirect faults,the former is mainly vertical pathway of oil migration,while the latter is essential pathway if it is linked up with the carrier.Analyses also demonstrate the feature of current structure is not the dominant factor that controls accumulating of hydrocarbon in lithologic traps,palaeo tectonic framework of upper major carrier J1s12 during the particular period of petroleum accumulation dominated the orientation of oil and gas migration,traps that connected with hydrocarbon kitchen directly by faults or traps within palaeo tectonic eminence that link up with indirect faults and carriers were principal hydrocarbon formation zone.