陕甘宁盆地南部侏罗系储层特征及控制因素

陕甘宁盆地南部侏罗系属河流—湖沼相沉积，储层岩石以石英砂岩、岩屑砂岩及次岩屑长石砂岩为主，孔隙类型为次生溶孔—粒间孔网络结构，根据毛管压力曲线可划分出３种储集层类型．指出储层的发育分布、结构和物性明显受沉积环境的控制，同时也受成岩作用改造的影响，有机酸的溶解作用改善了储层的储集性能，曲流河边滩相砂体是最有利的勘探区块．

Feature of Jurassic Reservoirs in South Shaanganning Basin and lts Controlling Factors

The jurassic reservoirs in south Shaanganning Basin are mainly quartzose sandstone, lithic sandstone and lithic feldspathic sandstone in which secondary pores are well developed. According to capillary pressure curves ,the reservoirs can be classified into three types.It is pointed out that the development distribution,texture and properties of the reservoirs are obviously controlled by the initial sedimentary environment,also intensely influenced by diagenesis. The corrosion of organic acid fluid improves the properties of the reservoirs. The meander bar is beneficial target stratum for oil exploration.