塔里木盆地乌什凹陷—温宿凸起油气运聚过程模拟实验研究

Experimental study of the oil and gas migration and accumulation process of Wushi Sag-Wensu Uplift in Talimu Basin

为了研究乌什凹陷—温宿凸起构造的油气运聚过程,预测有利的油气分布区,本文以过乌参1井剖面为地质模型,并结合该区的地质特征建立油气运移过程物理模拟的二维实验模型.模拟实验揭示:温宿凸起是油气运聚的目标指向区,断层在油气运聚过程中起着重要的作用;在驱动力相同的情况下,高渗透性砂岩层易于成为油气运移的运载层及有利储集层;泄压区是油气运移的指向区,在温宿凸起北部边界出现的变质岩分布带,有可能成为油气运移的屏障,寻找油气时应该避开,有断层沟通的潜山及砂体才是最有利的油气聚集区.

In order to investigate the hydrocarbon migration and accumulation process of Wushi Sag-Wensu Uplift in Talimu Basin and to predict the favorable distribution area of oil and gas,a two-dimensional experimental model of hydrocarbon migration and accumulation is built up.The establishment of the model is based on the geological model of the section through Wucan-1 well and the geological features of the area.The simulation results indicate that,Wensu Uplift is the directional area of hydrocarbon migration and accumulation;faults have the significant function in the process of hydrocarbon migration and accumulation;under the condition of the same drive force,the sandstone layers with high permeability become easily the carrying layers and the favorable reservoirs of oil and gas migration;the pressure releasing zones are the directional area of oil and gas migration;the metamorphic rock distribution belt on the northern border of Wensu Uplift become probably the barrier for hydrocarbon migration and accumulation,and the buried hills or sandstones connected by faults are the most favorable hydrocarbon accumulation areas.