浅析低渗透砂岩储层特征与形成机理

Characteristics and formation mechanism of low permeability sandstone reservoirs

综合利用岩心、薄片等资料,对低渗透砂岩储层的特征与形成机理进行了研究。低渗透砂岩储层具有成分和结构成熟度低、孔隙结构差、物性差、压力敏感性强、裂缝发育和非均质性强的特点。在概括沉积、成岩和构造作用对其控制的基础上,通过分析储层的形成机理,认为:沉积作用是形成低渗透砂岩储层的最基本因素;成岩作用对其影响具有双重性;构造作用形成的裂缝可作为裂缝性低渗透砂岩储层的主要渗流通道。

The cores and thin sections were applied to study the characteristics and formation mechanism of low permeability sandstone reservoirs.The low permeability sandstone reservoirs are characterized by low compositional and textural maturity,localized pore radius,poor reservoir properties,high pressure-sensitivity,probably well-developed fracture systems and strong heterogeneity.By analyzing the formation mechanism,this paper suggested that the genesis of low permeability sandstone reservoirs is intently related to sedimentation,diagenesis and tectonism that have occurred.Sedimentation is thought to be the most fundamental factor for the formation of low permeability sandstone reservoirs,diagenesis has dual effects on the physical properties,and the fractures formed by tectonism served as the main flowing path.