Analysis of main controls of stratigraphic reservoirs in Xingouzui Formation of Jiangling Sag based on a multivariate statistical method

Stratigraphic reservoirs are important areas for future oil and gas exploration in the Jiangling Sag of Jianghan Basin, but their hydrocarbon accumulation controls have not been systematically studied. Based on a multivariate statistical method, some key controls of stratigraphic reservoir formation were analyzed. It was proposed that reservoir conditions were the key factors for reservoir formation in stratigraphic reservoirs in the Paleogene Xingouzui Formation in the Jiangling Sag. When the Xingouzui Formation was deposited, the Jiangling Sag was a salt lake basin. The anhydrite cement content played a major role in controlling sandstone densification in stratigraphic reservoirs in the Xingouzui Formation. The anhydrite cement content of 7.5% is a critical value of reservoir physical properties. When the content is less than 7.5%, the physical properties are good. When the content is more than 7.5%, the reservoir physical properties are obviously deteriorated, and the logging interpretation indicates no petroleum resource. The relationship between paleo water depth and anhydrite content can be used to classify the distribution of favorable reservoirs.