塔中志留系柯坪塔格组下沥青砂岩段储层特征及其含油气性研究

Research on Reservoir and Its Hydrocarbon-bearing Characteristics in the Lower Bitumen-bearing Sandstone Member of Kepingtage Formation in Tazhong Area

在岩性资料综合分析的基础上,研究塔中地区志留系柯坪塔格组的下沥青砂岩段储层特征。储层岩石类型主要为岩屑石英砂岩,其次为岩屑砂岩和长石岩屑砂岩。储集空间以残余原生粒间孔、粒间溶孔和粒内溶孔为主。储层岩石主要经历了压实作用、胶结作用和溶蚀作用等成岩作用。在沉积相和成岩作用的控制下,储层砂岩为低孔—特低孔、特低渗储层。研究区沉积微相、岩性和物性等对下沥青砂岩段储层含油气性具有控制作用。

Based on the data of rock slice,electron microscope scanning,capillary tube pressure curves,physical property and so on,this paper discussed the reservoir characteristics of the lower bitumen-bearing sandstone member of Kepingtage formation of silurian in Tazhong Area. The reservoir rocks consisted of lithic quartz sandstone,litharenite and feldspathic lithic sandstone. The main reservoir space is residual intergranular pore,intergranular dissolved pores and intragranular dissolved pores. The diagenesis of sandstone is compaction,cementation and dissolution. Under the control of sedimentary facies and diagenesis,the reservoir rocks belong to the ultra low porosity and ultra low permeability reservoir. The hydrocarbon-bearing of the reservoir was controlled by microfacies,lithologies and physical properties.