Journal of Jilin University(Earth Science Edition) ›› 2020, Vol. 50 ›› Issue (3): 747-756.doi: 10.13278/j.cnki.jjuese.20180307

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Oil Shale Characteristics and Sedimentary Environment of Yan'an Formation in Middle Jurassic in Tanshan Area, Guyuan, Ningxia

Hai Lianfu1, Wang Lei1, Ma Zhijun1, Xu Qinghai2, Song Yang1, Bai Jinhe1   

  1. 1. Ningxia Hui Autonomous Region Mineral and Geological Survey Institute, Yinchuan 750021, China;
    2. Schoolof Earth Sciences, Yangtze University, Wuhan 430100, China
  • Received:2018-11-22 Published:2020-05-29
  • Supported by:
    Supported by Natural Science Foundation of Ningxia Hui Autonomous Region (2018AAC03204), Major (Key) Project in Key R & D Programs of Ningxia Hui Autonomous Region (2018BFG02013) and Geological Prospecting Fund Project of Ningxia Hui Autonomous Region (2017 Geological Prospecting 04)

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Abstract: There are abundant oil shale resources accompanied with coal in Tanshan area. Oil shale are mainly existed in coal-bearing strata of the middle and lower part of Yan'an Formation in Middle Jurassic. Based on the oil shale samples of Yan'an Formation obtained from boreholes, the characteristics and sedimentary environments were studied, and the identification basis of oil shale logging was defined in Tanshan area by low-temperature dry distillation, main element measurement,and drilling logging. The research shows that the oil shale in Tanshan area is mainly black, grayish black and dark gray, with light texture, low density,and low hardness. The oil shale has the characteristics of staggered, shell-like fracture, grease, asphalt luster, and block layer development. The oil-bearing ratio is 3.60%-9.00%, the ash is 42.50%-79.05%, the total sulfur is 0.07%-1.37%, and the calorific value is 11.01 kJ/g (average value), which belongs to medium quality because it is siliceous ash, low sulfur, and associated with coal. The content of SiO2 in oil shale varies greatly from 53.89% to 65.55%, Al2O3 is 17.45%-23.29%, K2O is significantly higher than Na2O, and Fe2O3+MgO value is 12.75%-21.98%, containing many potassium-bearing minerals and magnesium iron components. The Al2O3/(CaO+Na2O) value is 3.09-21.12, which reveals that the stable components in oil shale are high. The logging curves characteristics of oil shale are obviously different from the coal seams and mudstones. The data of gamma, sonic and density of oil shale are between the coal seam and the mudstone, and the resistivity is significantly lower than the coal seam and mudstone. The chemical alteration index of oil shale is 74.87-84.35, Sr/Ba value is 0.33-0.83 with average of 0.61, and Th/U value is 1.00-3.50, indicating that the oil shale sedimentary environment in Tanshan area was a warm, anoxic, and oxygen-poor terrestrial freshwater lake environment.

Key words: oil shale, oil-bearing ratio, sedimentary environments, Yan'an Formation, Tanshan area

CLC Number: 

  • P618.12
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