红柳泉-跃进地区下干柴沟组下段（E3^1）Ⅰ和Ⅱ砂层组的储层特征及其影响因素浅析

Reservoir Characteristics of Sand Beds Ⅰ and Ⅱ in Lower Member of Xiaganchaigou Formation,Hongliuquan-Yuejin Area and Influence Factors

通过岩心观察、薄片鉴定、测井和录井分析,认为柴达木盆地西南红柳泉—跃进地区下干柴沟组下段(E13)Ⅰ和Ⅱ砂层组的岩石成分成熟度和结构成熟度都较低,物性都较差。红柳泉地区以岩屑长石砂岩、长石岩屑砂岩为主,发育次生孔隙,物性较差,多数属于特低孔特低渗—低孔低渗储层;而跃进地区以长石岩屑砂岩、岩屑砂岩为主,发育原生孔隙,物性相对较好,但仍以低孔低渗储层为主。影响研究区物性的因素有沉积环境、岩石类型、填隙物成分及含量、成岩改造程度。

Results of the core observation, slice identification and logging data analysis suggest that detrital rocks in sand beds Ⅰ and Ⅱ in lower member of Ganchaigou Formation, southwestern Hongliuquan Yuejin Area are char acterized by low maturity of rock composition and structure, with poor physical property. Debris feldspar and feldspar-debris sandstones are predominate in the Hongliuquan area, with secondary porosity and poor physical property, most of which belongs to super low porosity and super low permeability reservoiclow porosity and low permeability reservoirs; while feldspar-debris and lithic sandstones are dominate in the Yuejin area, with original pore and good physical property, but which still is low porosity and low permeability reservoirs. The physical property of reservoir in this study is controlled by sedimentary environment, type rocks, composition and content of fillings, as well as degree of diagenetic reconstruction.