基于微观渗流特征的低渗气藏储层分类研究

海上某凹陷低渗气藏开发目前处于探索实践阶段，其微观孔隙结构、渗流特征尚未进行系统研究。此文通过恒速压汞、核磁共振、岩心驱替等实验手段，系统研究了储层微观孔隙结构特征、可动水饱和度及相应的产水机理、气水渗流规律等，并建立了以“渗透率、孔隙度、主流喉道半径、含气饱和度、可动水饱和度”五特征参数为基础的低渗储层分类图版，为海上低渗气藏有效开发模式实践、选井选层提供了评价基础。

Classification of Gas Reservoir with Low Permeability Based on Micro-flow Characteristics

Because the development of gas reservoir with low permeability in one offshore sag is still in the stage of practical exploration at present, the micro-pore structure, micro-flow characteristics have not been systematically studied. Based on the experimental data from constant rate mercury injection, nuclear magnetic resonance image, core displacement test, the authors studied the micropore structure characteristics, movable water saturation and the corresponding mechanism of water generated and the law of gaswater seepage flow, and established a chart for the classification of low permeability reservoir by taking into consideration of five characteristic parameters i.e. permeability, porosity, dominant throat radius, gas saturation, movable water saturation. This provides a useful reference for the efficient development of offshore and for the selection of well and layer.