Pore Types and Pore Texture of Sandstone Reservoir of 2nd Member of Shanxi Formation, Ordos Basin

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  • Langfang Branch of Research Institute of Petroleum Exploration and Development, PetroChina, Langfang 065007, China

Online published: 2008-04-20

Abstract

Based on the identification of cast slice, granularity analysis, mercury penetration curves and physical property statistics, microscopic features such as pore types and structure in the sandstone reservoirs of 2nd member of Shanxi Formation in Ordos basin are studied. The result shows that the gas reservoir spaces of the 2nd member of Shanxi Formation mainly include inter\|granular dissolution pores, survived original inter\|granular pores, debris intragranular dissolution pores, filling ingredient dissolution pores, kaolinite intercrystalline pores and a few of micro\|crevasses. The permeability is correlative with the porosity, but they both are related with the pore structure. Four kinds of reservoirs are identified by the mercury penetration parameters and physical properties of the reservoirs. Class Ⅰ has high permeability, mainly contains inter\|granular dissolution pores, which has good underpropping structure and good communication. Class Ⅱ is a kind of fair quality reservoir, containing inter\|granular dissolution pores, intragranular dissolution pores and kaolinite intercrystalline pores. Class Ⅲ is of lower permeability and contains survived original inter\|granular pores and kaolinite intercrystalline pores. Class Ⅳ only contains isolated micropores. It indicates that quartz\|sandstones with coarse granular texture and pebbled underpropping structure are of high permeability. Sandstone reservoir of pebbled underpropping structure is characterized by double\|peak ggrain distribution, which could accelerate the pore water flowing and conduce to dissolution of filling ingredients, improving the reservoir permeability.

Cite this article

ZHANG Man-Lang, LI Xi-Zhe, XIE Wu-Ren . Pore Types and Pore Texture of Sandstone Reservoir of 2nd Member of Shanxi Formation, Ordos Basin[J]. Natural Gas Geoscience, 2008 , 19(4) : 480 -486 . DOI: 10.11764/j.issn.1672-1926.2008.04.480

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