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运用铸体薄片镜下观察、物性分析、扫描电镜及X-衍射等分析手段,对四川盆地中西部须家河组的储层特征、沉积作用和成岩作用进行了研究。结果表明,研究区须家河组储层孔隙类型以残余原生粒间孔和粒内溶孔为主,平均孔隙度为5.83%,平均渗透率为0.283×10-3μm2,为低孔-低渗型储层;控制储层发育的主要因素是沉积作用和成岩作用。三角洲前缘河口坝和水下分流河道沉积微相是储层发育的有利相带。压实作用是导致储层孔隙损失的主要因素,溶蚀作用是对储层发育贡献最大的建设性成岩作用,早期绿泥石环边胶结作用有利于保护剩余原生粒间孔隙。
The characteristics of the reservoirs, sedimentation and diagenesis of the Xujiahe Formation in central and western Sichuan Basin were studied by means of microscopic observations of casting thin films, physical properties analysis, scanning electron microscopy and X-ray diffraction analysis. The results show that the pore types of the Xujiahe formation in the study area are dominated by residual primary intergranular pores and intragranular dissolved pores, with an average porosity of 5.83% and an average permeability of 0.283 × 10-3μm2, with low porosity and low permeability Type reservoirs; the main factors controlling reservoir development are sedimentation and diagenesis. The delta front mouth mouth dam and underwater distributary channel sedimentary microfacies are favorable facies belts of reservoir development. Compaction is the main factor leading to the loss of reservoir porosity. Dissolution is the most important constructive diagenesis for reservoir development. Early chlorite edge-to-edge cementation helps to protect the remaining primary intergranular pores.