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针对鄂尔多斯盆地钻探中普遍存在储集层流体呈现出的低压异常现象,开展了岩石的加卸载应力试验以及通过地层降温、区域裂缝、天然气动静平衡等原理分析研究,对气藏低压成因提出了新的认识。认为:喜马拉雅构造运动期鄂尔多斯盆地经过强烈、持续不断地整体抬升后,由于风化剥蚀作用导致了地层的卸载、差异回弹、区域裂缝、地温降低而形成的孔隙扩容,由此造成的天然气大面积、分散式的低效充注和缺乏有效聚集是导致地层流体压力降低、能量不足的主要原因。
Aiming at the low pressure anomaly commonly occurring in the drilling fluid in the Ordos Basin, the loading and unloading stress tests of the rock are carried out, as well as the principle analysis of the stratum cooling, the regional cracks and the static and dynamic balance of natural gas. Understanding. It is concluded that the Ordos Basin during the Himalayan tectonic movement is characterized by strong and continuous uplifting of the whole and the pore expansion caused by the unloading of stratum, differential rebound, regional cracks and ground temperature decrease due to weathering and denudation, resulting in large area of natural gas , Distributed inefficient charging and lack of effective accumulation are the main reasons for the decrease of formation fluid pressure and lack of energy.