Abstract: Sulige Gas Field is the largest gas field with reserves in place of 533.652 billion cubic meters and gas-bearing area of 4054.6 square kilometers in Ordos Basin. It is a low-efficiency gas field with low reserves abundance. The forming mechanism of low-efficiency gas reservoir in Sulige Gas Field was researched. The geological factors resulting in low-efficiency gas reservoirs in Sulige Gas Field include the strong anisotropies in the reservoir, low height of gas column resulted from very gentle structures, poor connectivity and low energy induced by ultra-low pressure in gas pay zones.

Key words: Ordos Basin, Sulige Gas Field, low-efficiency gas reservoir, anisotropy, ultra-low pressure, connectivity

摘要： 鄂尔多斯盆地苏里格气田是一个地质储量为5336.52×10⁸m³、含气面积为4054.6km²的大气田,同时也是一个低丰度储量、开发难度大的气田。对该气田低效形成机理的研究结果表明,储集体内部非均质性强,平缓构造背景导致气柱高度小,因而气层连通性变差,异常低压使天然气穿透流动能量不足,这些是导致气藏低效的主要因素。

关键词: 鄂尔多斯盆地, 苏里格气田, 低效气藏, 非均质性, 低压异常, 连通性