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通过恢复库车坳陷克拉苏构造带深层和鄂尔多斯盆地伊陕斜坡延长组主要成藏期的过剩压力,结合对研究区低渗透储层的物性演化历史分析,对低渗透致密砂岩储层运移过程中油气可能的动力条件进行评价。结果表明:低渗透致密砂岩储层中油气运移的主要动力具有多样性;库车坳陷克拉苏构造带深层在天然气的成藏时期储层已经致密,天然气运移的主要动力为快速沉积、生烃、构造挤压等多因素作用形成的异常高压;鄂尔多斯盆地伊陕斜坡延长组在早、中期油充注时储层尚未致密,在浮力作用下发生侧向运移,晚期油充注时储层已经致密,油利用先前与油长期接触而具亲油性的残留路径沿优势输导通道侧向运移,毛细管力为主要动力,储层间的过剩压力差也起一定作用,是多期次多动力联合作用的结果。
By restoring the residual pressure in the Kelasu tectonic belt in the Kuqa Depression and the extension of the Yanchang Slope in the Erdos Basin during the main hydrocarbon accumulation period, combined with the historical analysis of the physical evolution of the low permeability reservoirs in the study area, the migration of low permeability tight sandstone reservoirs The possible kinetic conditions for hydrocarbons during the process are evaluated. The results show that the main driving force of hydrocarbon migration in low permeability and tight sandstone reservoirs is diversified. The deep reservoirs of Kelasu structural belt in the Kuqa Depression are dense during gas accumulation and the main driving force for natural gas migration is rapid deposition, Hydrocarbon generation and tectonic extrusion. The Yanchang Slope in Yanchang-Slope area in the Ordos Basin did not have dense reservoirs during early and mid-term oil filling, laterally migrated under buoyancy, The reservoirs are dense and the oil is transported laterally along the long-term contact with the oil and the lipophilic residual path moves laterally along the dominant channel. The capillary force is the main driving force and the excess pressure difference between the reservoirs also plays a role. The result of combined effect of multiple motions.