南土尔盖盆地成藏组合划分及资源潜力分析

Play division and analysis of resource potential of South Turgay Basin

南土尔盖盆地是哈萨克斯坦国家的主要含油气盆地之一,在哈萨克斯坦所有的沉积盆地中面积位居第四。该盆地勘探始于20世纪60年代,至今已有近50年的勘探开发历史,在此期间一系列油田相继被发现,盆地整体处于勘探程度较高的阶段。其探明石油地质储量和可采储量分别占哈萨克斯坦全国储量的4.7%和5.6%。目前盆地已发现油气主要集中在盆地南部的Aryskum坳陷,纵向上已发现含油层系主要集中在Pz、J和K,经过研究,把纵向上已发现的5套含油层系,根据成藏条件划分出3套成藏组合,并且以K1—J3含油层系最为重要,是油气储量集中带。USGS评估的待发现可采资源极为可观,本次计算待发现资源量为1 530百万桶,因此仍具有较大勘探潜力。

South Turgay Basin has been one of the primary hydrocarbon-bearing basins in Kazakhstan, and the fourth large sedimentary basin in Kazakhstan as well. Oil exploration and exploitation in this basin began in 1960s, and then a plenty of oil fields have been found and declared during the last 50 years. Basin as a whole is at a higher degree of exploration stage. Proved and recoverable oil reserves of the basin amount for 4.7% and 5.6% of total reserves in Kazakhstan respectively. Oil discovered in these oil fields mostly located in southern Aryskum depression, and most of the hydrocarbon-bearing series vertically located in Pz, j and K strata. Five oil series have been identified and divided into three oil plays in the basin, especially K1-J3 is the most important hydrocarbon-bearing series. According to the USGS＇ s assessment, the recoverable reserve is extraordinary rich. In this article the reassessed undiscovered resources have reached 1530 MMB, which shows the basin has good exploration potential.