准噶尔盆地西北缘乌夏断裂带构造特征与油气成藏模式

在分析准噶尔盆地乌夏地区构造特征、沉积类型和成藏过程的基础上,以油气源、油气运移方向、运移过程和成藏期等因素为背景,将研究区的成藏模式划分为近源侧向砂体-不整合输导早期成藏模式、近源垂向断层输导多期成藏模式、远源混向"Z"字型输导多期成藏模式和远源混向阶梯状输导晚期成藏模式4种类型.乌夏断裂带构造活动的复杂性导致油气成藏具有明显的分段性、多期次和多类型的成藏特点.研究认为,断裂发育和不整合面是形成不同油气藏模式的主要控制因素.

Study on the structural features and hydrocarbon accumulation modes of Wuxia fault belt in the northwest margin of Junggar Basin

Based on the analysis of structural features,sedimentary types and pool forming process in Wuxia area,according to hydrocarbon sources,migration direction and migration process and hydrocarbon pool forming stages,the pool forming modes are classified into four types,that is,① early near-source pool forming mode with lateral sand-body--unconformity migration system;② multi-stage near-source pool forming mode with vertical fault migration system;③ multi-stage far-source pool forming mode with mult-directional "z" type migration system;④ late far-source pool forming mode with lateral and vertical stepladder type migration system.Because of the complexity of the structure activity in Wuxia fault belt,the formation of the hydrocarbon pools has the characteristics of multiple stages and multiple types.It is held that the developed faults and unconformities are the main factors controlling the hydrocarbon pool forming in this area.