Volume 23 Issue 6
Dec.  2017
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CHEN Jing, WU Wei, WANG Juan, et al., 2017. MICROSCOPIC PORE CHARACTERISTICS AND INFLUENCE FACTORS ANALYSIS OF SHALES IN PERMIAN, YANLONG AREA, SOUTHERN NORTH CHINA BASIN. Journal of Geomechanics, 23 (6): 829-837.
Citation: CHEN Jing, WU Wei, WANG Juan, et al., 2017. MICROSCOPIC PORE CHARACTERISTICS AND INFLUENCE FACTORS ANALYSIS OF SHALES IN PERMIAN, YANLONG AREA, SOUTHERN NORTH CHINA BASIN. Journal of Geomechanics, 23 (6): 829-837.

MICROSCOPIC PORE CHARACTERISTICS AND INFLUENCE FACTORS ANALYSIS OF SHALES IN PERMIAN, YANLONG AREA, SOUTHERN NORTH CHINA BASIN

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  • Received: 2017-03-31
  • Published: 2017-12-01
  • Using argon ion polishing and field emission environmental scanning electron microscopy imaging testing technique, the interactive marine-continental facies and continental facies shale samples from Permian drilled in ZK1614 well in Yanlong area of southern North China Basin are scanned, and the SE and BSE information are obtained as well. Combining X-ray spectrum information with gray level recognition function of JMicroVision software, qualitative analysis and quantitative representation of the mineral composition and the characteristics of micro pores of shale samples are made, and the genesis of pore system are discussed. The research shows that the pores of shale samples are mainly inorganic mineral pores, and the pore types include intragranular pores, intergranular pores, and a small amount of organic matter pores and micro fissures. The surface porosities of samples from Permian are between 0.92%~5.53%, and surface porosities are positively correlated with the number of pores in general. With different sizes of pores, there is a two-segment linear relationship between the logarithmic index of pore area and the logarithmic index of pore number of unit area in different pore diameter interval between 50~2000 nm, and when the pore diameter is small, they are negatively correlated, when the pore diameter is large, they are positively correlated. Different minerals result in different control effects on the development of pores.Brittle minerals mainly influence the development of micro fissures and inhibit the development of pores; clay minerals, due to the actions of tectonic stress, phase transformation and dehydration of minerals, result in plenty of pores, which promote the development of pores. Besides, the differential expansion and differential dissolution of minerals could also produce pores. During the Yanshan and the Himalayan periods, large scale fractures were formed in the study area. The development of fractures increased the penetrability of the roc kstratum, which promoted the dissolution of minerals by organic acids and formation water, and it also promoted the development of pores correspondingly. Moreover, with the increase of burial depth, the pore volume decreased with the increase of compaction.

     

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