塔里木盆地塔北隆起雅克拉断凸带形成时代的厘定

Definition of the era for the formation of Yakela fault block with the uprise of the north Tarim in Tarim Basin

经过地震剖面的解释及演化剖面的制作,通过对雅克拉断凸的构造演化过程与区域构造演化相结合,重新分析雅克拉断凸的构造特征并且厘定了构造演化序列。雅克拉断凸在印支晚期最终定型。喜山早期断凸顶部形成构造反转,断凸核部新生界内发育正断层,反转构造的时代沿着走向方向呈西老东新特征。喜山晚期形成的库车褶皱冲断作用影响,雅克拉断凸整体向北倾斜。印支期前塔里木北部覆盖碳酸盐岩,印支期雅克拉断凸形成后,核部地区剥蚀量大,古生界沉积地层被剥蚀至基底出露,而断凸南北坡还残留碳酸盐岩地层,由断凸向南北向逐渐加厚。雅克拉断凸北坡和南坡具有形同的演化过程,同样是缝洞型油藏的分布区。在一定油气地质条件下也可形成塔河型油气藏。

with explanations on seismic section and production of evolution profile, the combination of structure evolutionprocess and regional structure evolution process of Yakela fault block, this paper analyzes the structure characteristics of Yakela faultblock and determines the structure evaluation sequence. The rudiment of Yakela fault block was finalized in the end of Indosinianperiod.The top of the fault block in early Himalayan constitutes reversal; normal fault develops inside the cenozoic erathem offault core part; and the Formation characteristics of inverted structure that the west is new and the east is old along the trend. In lateHimalayan, the Kuche fold-thrust effect is formed, and the whole Yakela fault block inclines the north. Before Indosinian period, thewhole north of Tarim was covered by carbonate rocks; in Indosinian period, the core of Yakela fault block was corroded too serious toout to expose base, and the south-north slope of the fault had still remained carbonate rocks which became More thick from the southto the north. The north slope and the south slope of Yakela fault block have the same evaluation process and also are the distributionareas of fractured-vuggy reservoir. In certain oil-gas geological condition, it can form to be the oil and gas reservoir of Tahe type.