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川东北地区上三叠统须家河组地层具有较大的勘探开发潜力,但长久以来对该地层的研究甚少,沉积相和储层研究已成为川东北地区须家河组油气开发急需解决的问题之一。通过岩心观察、薄片鉴定及样品分析测试工作,根据岩石特征及测井相分析方法,对川东北地区须家河组沉积相类型、储集空间类型、储层物性特征以及影响储层的因素进行了分析。结果表明,研究区须家河组主要发育辫状河三角洲相沉积,可进一步划分为三角洲平原、三角洲前缘及前三角洲3类亚相;储层低孔低渗,主要孔隙空间为次生孔隙和裂缝,裂缝—孔隙型是主要的储集类型;储层储集性能主要受沉积微相和成岩作用控制。
The Upper Triassic Xujiahe Formation in northeastern Sichuan has great potential for exploration and development, but few studies have been done on this stratum for a long time. Sedimentary facies and reservoir research have become an urgent need to be solved in the Xujiahe Formation in northeastern Sichuan One of the problems. Through the observation of cores, identification of thin sections and sample analysis and testing, according to the characteristics of rocks and logging facies analysis, the sedimentary facies type, reservoir space type, physical property of reservoirs and the factors affecting reservoirs of Xujiahe Formation in northeastern Sichuan are studied Analysis. The results show that the Xujiahe Formation in the study area is mainly composed of braided delta facies, which can be further divided into three types of subfacies: delta plain, delta front and the former delta. The reservoir is characterized by low porosity and permeability and the main pore space is secondary porosity And fissures and fractures - pore types are the main types of reservoirs. Reservoir reservoir performance is mainly controlled by sedimentary microfacies and diagenesis.