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- Title
黔北凤冈地区海相牛蹄塘组页岩气成藏地质特征及评价.
- Authors
张大权; 邹妞妞; 杜威; 赵福平; 陈祎; 石富伦; 王奕松; 林瑞钦
- Abstract
On the basis of characteristics of shale reservoir formation, such as lithology and mineral composition, organic geochemistry, reservoir characteristics, gas-bearing characteristics, combined with structural style and burial depth, faults and fractures, top and floor cap rocks, reservoir pressure, a comprehensive characterization of the Niutitang shale is performed. The results indicate the Niutitang shale has high TOC, high RO, brittle mineral contents and methane sorption capacity. The main pores of shale minerals include mud particle pores, bedding cracks, interlayer cracks, which are large in number and mainly primary, and have a significant impact on the porosity and permeability of the reservoir. The total gas content of shale has a significant positive correlation with porosity, specific surface area and TOC, and is inversely proportional to clay mineral content. So the contribution of porosity and specific surface area to gas content of shale is greater than that of clay mineral content. From the perspective of preservation conditions, the gentle anticline and saddle structural strata sandwiched by the anticline in the study area is relatively slow, the burial depth of Niutitang Formation is moderate, and it has good roof and floor caprock, which is conducive to the preservation of shale gas. But poor sealing, strike slip and high angle fracture fault are not conducive to preservation, which will destroy the preservation of shale. In addition, reservoir pressure does not play a decisive role in preservation conditions, and there is also industrial value of shale gas accumulation in low-pressure and atmospheric pressure formations. Finally, a valuation index system of preservation conditions is put forward and the comprehensive favorable areas for shale accumulation in the study area are optimized.
- Subjects
GUIZHOU Sheng (China); CAP rock; OIL shales; ORGANIC geochemistry; SHALE gas reservoirs; CLAY minerals; ATMOSPHERIC pressure; SHALE gas
- Publication
Natural Gas Geoscience, 2022, Vol 33, Issue 6, p886
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2021.12.012