论文部分内容阅读
鄂尔多斯盆地南泥湾的主力油层是三叠系延长组长6油层组,通过研究区内大量岩心观察、铸体薄片及物性等资料分析,并对储层岩石学特征、孔渗特征及孔隙类型等进行了深入研究,并分析了影响储层储集性能的主要因素。研究区以内陆淡水湖泊河控三角洲沉积为主,储层岩石类型主要有长石砂岩、岩屑主要为变质岩岩屑,成分成熟度普遍较低,结构成熟度好;成岩作用主要为压实作用、胶结作用和溶解作用,孔隙类型以粒间孔、次生溶孔为主。优质的储层多分布于三角洲前缘水下分流河道和河口坝。沉积作用、成岩作用均对储层物性有重要影响。
The main reservoir of Nanniwan in Ordos Basin is Chang 6 reservoir of Yanchang Formation in Triassic. Based on the analysis of a large number of core observations, thin sections of castings and physical properties in the study area, the reservoir petrology, pore-permeability characteristics and pore types And other in-depth study, and analyzed the main factors that affect reservoir performance. The study area is dominated by river-controlled delta deposits in inland freshwater lakes. The reservoir rock types are mainly feldspar sandstone, and the cuttings are mainly metamorphic rock cuttings with generally low compositional maturity and good structural maturity. Diagenesis is mainly compaction Role, cementation and dissolution, pore type to intergranular pores, secondary dissolution-based. High-quality reservoirs are mostly distributed in the delta front subaqueous distributary channel and estuary dam. Sedimentation and diagenesis have an important impact on reservoir physical properties.