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泌阳凹陷赵凹油田安棚区深层系主要指埋深大于 30 0 0m的核三下段 ,属扇三角洲沉积。岩芯描述和常规薄片、铸体薄片、扫描电镜、X衍射分析及压汞资料研究表明 ,安棚深层系的岩石类型主要为岩屑砂岩、长石岩屑砂岩和岩屑长石砂岩。快速堆积 ,颗粒大小混杂 ,分选差 ,成分成熟度和结构成熟度低 ,是导致深层系砂岩低渗的基础条件 ;砂岩储层以扇三角洲前缘的水道砂和河口坝砂物性最好 ,席状砂次之 ;储层孔隙类型以次生溶孔和残余粒间孔为主 ,孔隙小 ,具两种孔隙介质 ,喉道细小且不均匀 ,孔喉分布状况差 ,结构复杂 ,为典型的特低孔特低渗储层 ;成岩作用 ,特别是压实作用和晚期碳酸盐胶结充填作用是影响储层微观非均质性和导致储层致密低渗的主要因素。
The deep shelf of the Anpeng area, Zhaoou Oilfield, Biyang Depression mainly refers to the lower third of the Nanshan Member, which has a buried depth greater than 300 m, and belongs to fan delta deposition. Core description and conventional thin slices, cast thin slices, scanning electron microscopy, X-ray diffraction and mercury intrusion data show that the rock types of the Anpeng deep system are mainly lithic sandstone, feldspar lithic sandstone and lithic feldspar sandstone. Rapid accumulation, mixed particle size, poor sorting, low compositional maturity and low structural maturity are the basic conditions leading to the low permeability of sandstones in the deep strata. The sandstone and estuarine sand of sandstone reservoirs in the fan delta front have the best physical properties, The pore types of reservoir are dominated by secondary and residual intergranular pores with small pores and two types of pore media with small and uneven throats and poor distribution of pore throats and complex structures, Of ultra-low porosity and permeability reservoir. Diagenesis, especially compaction and late carbonate cementation and filling are the main factors that affect the micro-heterogeneity of reservoir and the low permeability of reservoir.