柴达木盆地北缘油气分布规律研究

STUDY ON THE DISTRIBUTION RULES OF-HYDROCARBON IN THE NORTHERN MARGIN OF THE QAIDAM BASIN

该文以柴达木盆地北缘多年的勘探成果及取得的地质认识为基础,较深入地剖析了该区油气成藏的主要控制因素,并系统地分析了油气的分布规律,这对该区的油气勘探具有重要的借鉴意义。作者指出,柴达木盆地北缘油气分布主要遵循4条规律:有效烃源岩的分布是决定油气发现的先决条件;烃源岩的热演化程度决定油气田的资源类型;始新世末的早期喜马拉雅运动形成的古圈闭与生烃史的匹配关系好;喜马拉雅运动第Ⅲ幕以来形成的浅层滑脱断层对原生油藏具有较大的破坏作用。

Based on the exploration results and geological cognition obtained in the northern margin of the Qaidam Basin, the major controlling factors of hydrocarbon accumulation in this area were discussed in depth and the distribution rules of hydrocarbon were analyzed systematically. This has an important significance for reference in the petroleum exploration of this area. It was pointed out that the distribution of hydrocarbon in the northern margin of the Qaidam Basin mainly follows four rules. The distribution of effective surce rocks is the precondition to the discovery of hydrocarbon, the thermal evolutionary degree of source rocks determines the resource types of oil and gas fields, the paleotraps formed by the Early Himalayan movement at the end of the Eocene match well with hydrocarbongenerating history, and the shallow strike faults formed since the third episode of the Himalayan movement have greater katogene to primary oil pools.