四川盆地潼南地区位于川中南部平缓构造带,该区须家河组须二段储层具有孔隙度低、渗透率低、非均质性强以及含水饱和度高的特点。寻找具有相对高孔隙度和高渗透率的有利储层对于气藏的有效开发具有重要的意义。通过薄片观察、沉积相和储层精细分析认为,有利储层的发育受主河道发育带、早印支期古地貌、层序界面以及泥岩发育带的控制。主河道发育带砂体粒度粗,结构和成分成熟度较高,原生孔隙发育;下伏早印支期古地貌的起伏,导致须二下亚段在地形高部位和斜坡带形成高能河道,所沉积砂岩孔隙和渗透性发育,而须二上亚段沉积时地形平缓,水动力较弱,砂岩粒度细,物性较差;湖泛面上下的泥岩发育带在深埋受热过程中形成的酸性水溶液,有利于其附近的砂岩溶蚀孔隙形成。利用阵列感应测井和核磁共振实验,较为精确地计算了研究区的束缚水饱和度和可动水饱和度,据此将须二段储层划分为气层、气水同层和水层。储层含气性主要受物性、沉积相和构造起伏的控制,含气性较好的区域基本分布在须二上亚段和须二下亚段上部河道叠置带储层的构造高部位地区。 The Tongnan area in the Sichuan Basin is located in the gentle structural belt in the central and southern Sichuan Basin. The Xujiahe Formation in the Xujiahe Formation in this area has the characteristics of low porosity, low permeability, high heterogeneity and high water saturation. Finding favorable reservoirs with relatively high porosity and high permeability is of great significance to the effective development of gas reservoirs. Through thin-layer observation, sedimentary facies and reservoir fine analysis, the development of favorable reservoirs is controlled by the main channel development zone, the Early Indosinian ancient topography, the sequence boundary and the mudstone development zone. The sand bodies in the main channel development zone are coarse in grain size, high in structure and composition maturity, with primary pore development. The ups and downs of the paleogeomorphology underlying the Early Indosinian have led to the formation of high-energy channels in the upper part of the terrain and in the slope zone Sedimentary sandstone porosity and permeability development, while the second upper sub-segment deposition terrain flat, weak hydrodynamic, fine sandstone granularity, poor physical properties; lake flooding surface mudstone development zone in the process of deep buried heating acid aqueous solution , Is conducive to the formation of sandstone dissolution pores nearby. Using the array induction logging and NMR experiments, the irreducible water saturation and the movable water saturation in the study area are calculated more accurately. Thus, the second member of the Second Member of the Second Member is divided into gas, gas and water layers. The gas-bearing of the reservoir is mainly controlled by physical properties, sedimentary facies and tectonic fluctuations. The regions with good gas-bearing properties are basically distributed in the high-tectonic parts of the Upper Superimposed Reservoirs with Upper S2 and Upper S2 sub-Member .