Facies And Reservoir Characteristics Of Shiniulan Group In Southeast Area Of Sichuan

Sichuan Basin is China's major oil and gas basins. Southwestern China is also an important production base of natural gas. Sichuan Basin in the southeast sector of Paleozoic gas exploration for new fields, exploration and research level low, buried deep layer of purpose, multi-phase transformation into a multi-phase possession, a high degree of structural deformation, complex geological structure and a high source rocks Evolution of a mature, and many other features, natural gas distribution and possession of a major tectonic setting, the basin structural framework and fault control. In recent years the research and exploration work shows that the study area has good prospects for natural gas exploration, as the next step in Sichuan Basin natural gas exploration strategy to replace the area. The reservoir in southeast area of Sichuan can be sorted into carbonate and clasolite. These reservoir have characteristics of low porosity and permeability, large transversal change, strong heterogeneity, invisibility,complexity and high difficulty of exploration.The impact of the campaign in Guangxi, Sichuan Basin in the Silurian are more erosion, retaining only the most parts of the Silurian Longmaxi Group(formation), Shiniulan Group (or Xiaoheba Group) and Hanjiadian GroupLate Paleozoic strata directly Coverage in the Silurian strata above. In the region, the Silurian on the Yangtze is a major source rocks, and the Silurian the black shale of Longmaxi Group, Shiniulan Group of limestone (or sandstone of Xiaoheba Group) and shale of Hanjiadian Group , constitutes a good secondary health - Reserve - covered portfolio. Shiniulan Group mainly distributed in the Qianbei and South Sichuan region, mainly limestone and shale. Xiaoheba Group distributed in the southeast region, mainly shale and siltstone folder a small amount of limestone. Shiniulan Group and Xiaoheba Group at the same time-different strata unit.This paper used stratigraphy, sedimentology, reservoir geology, and other multi-disciplinary theories and methods, the focus of the study area the carbonate rocks deposited in a fine research and mapping to identify the micro-type of sequence evolution and its vertical plane of distribution. On this basis, the carbonate reservoir on the type of reservoir space, structural characteristics, physical characteristics, diagenetic evolution sequence, the impact of factors such as reservoir development, analysis of its favourable exploration blocks, the area Silurian exploration Provide a basis for decision-making.According to the core collection, thin, logging and comprehensive analysis of test data, combined with previous research results that Silurian period, the Sichuan Basin in the southeast region-carbonate gentle slope-the delta regressive sedimentary environment; According to the identification sheet, the study area for cracks in Shiniulan Group-porosity reservoir; Deposition phase of analysis, comparison and reservoir characteristics research, the study area purpose of the reservoir, the main focus of the gentle slope in the tidal flat carbonate (lagoon)-bank of the band, the reservoir lithology for the Oolitic limestone, the Health crumbs Limestone, Dolomite gray matte.