春风油田沙湾组储层特征及储集性能分析

春风油田位于准噶尔盆地西部车排子凸起的东北部,主要发育扇三角洲前缘水下分流河道与辫状河三角洲前缘水下分流河道微相。在地层精细划分对比及沉积微相研究基础之上,通过岩心、薄片观察,结合扫描电镜、X-衍射分析、压汞曲线等实验数据,对春风油田沙湾组一段1砂组展开储层特征及主控因素研究。研究结果表明:沙湾组一段1砂组N_1s_1~1层主要为棕褐色含砾不等粒砂岩,经鉴定认为属于岩屑质长石砂岩,目的层自下而上呈现出底砾岩→粗砂岩+含砾砂岩→细砂岩+泥质粉砂岩三层结构;储集空间主要为原生粒间孔,大孔粗喉型及大孔中喉型为目的层油气主要富集型孔隙结构;常见碳酸盐胶结,不同井区不同相带下碳酸盐含量差异较大,为影响储层物性的主控因素。

The analysis on the Reservoir characteristics and Reservoir performance analysis in Chunfeng Oilfield

The Chunfeng Oilfield is locates in the northeast of the Chepaizi Uplift, the western margin of the Junggar Basin, the main Sedimentary microfacies are fan detla front underwater distributary channel and braided river delta front underwater distributary channel. Base on the contrast of stratigraphic subdivision and the research of sedimentary microfacies, through observing the core, thin sections, combined with the experimental datas of scanning electron microscopy, X-difraction analysis and mercury curve, carried out the research of the reservoir characteristics and the main controlling factors of N1s11 layer in Chunfeng Oilfield. The results show that N1s11 brown conglomeratic sandstone reservoirs are mainly identified lithic arkose, the layer from bottom to top presents three layers structure: the basal conglomerate grit, conglomeratic sandstone and fine sandstone, fine sandstone and argillaceous siltstone. Reservoir spaces are mainly primary intergranular pore, large pore coarse throat type and large pore medium throat type are the main pore structures for storing oil and gas. carbonate cementation, which is common and the carbonate content under different wells and phases are different, is the main control factor of reservoir property.