水溶气储层基本特征的研究——以渭河盆地固市凹陷临渭区为例

Study of Characteristics of Water-soluble Gas Reservoir——Linwei District of Gushi Sag in Weihe Basin

渭河盆地水溶气研究相对滞后,为揭示水溶气储层基本特征,科学高效开发渭河盆地水溶气资源。依据岩性特征、沉积韵律和旋回、砂地比、孔隙度、含气性的综合分析,张家坡组可划分为上、中、下气组,演化过程为湖泊形成-扩展-委缩的沉积演化过程。该地层为特高孔渗砂岩储层,且孔隙度和渗透率在平面上存在非均质性,纵向上整体呈随深度变浅而减小的趋势,这充分表明上、中段张家坡组为有利储集层。

The study of the water-soluble gas in Weihe Basin is relatively behind. The paper aimed to uncover the characteristics of the water-soluble reservoir, and achieve efficient and scientific pur- poses to develop water-soluble gas resources. On the basis of lithologic properties, sedimentary rhythm and cycle, sandstone in ratio of formation, porosity and gas reservoir attributes of the com- prehensive analysis of Zhangjiapo Formation can be divided into upper, middle and lower. The evo- lution process of Zhangjiapo Formation is the lacustrine facies sedimentary history of formation-exten- sion-shrinkage. The strata is the extra-high permeability and porosity reservoir. Its permeability and porosity have anisotropism in the plane, decreasing overall as depth reduces, which well indicates that the upper and middle section of Zhangjiapo Formation is favorable for accumulation.