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2019 Vol. 25, No. 3
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Yongyan GUO, Mingliang LIANG, Zongxiu WANG, Linyan ZHANG, Huijun LI, Xiaoshi LI. ORGANIC GEOCHEMISTRY AND MINERAL COMPOSITION CHARACTERISTICS IN SHALES OF NIUTITANG FORMATION, NORTHWESTERN HUNAN[J]. Journal of Geomechanics, 2019, 25(3): 392-399. doi: 10.12090/j.issn.1006-6616.2019.25.03.036
Citation: Yongyan GUO, Mingliang LIANG, Zongxiu WANG, Linyan ZHANG, Huijun LI, Xiaoshi LI. ORGANIC GEOCHEMISTRY AND MINERAL COMPOSITION CHARACTERISTICS IN SHALES OF NIUTITANG FORMATION, NORTHWESTERN HUNAN[J]. Journal of Geomechanics, 2019, 25(3): 392-399. doi: 10.12090/j.issn.1006-6616.2019.25.03.036
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ORGANIC GEOCHEMISTRY AND MINERAL COMPOSITION CHARACTERISTICS IN SHALES OF NIUTITANG FORMATION, NORTHWESTERN HUNAN

  • 1.

    Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China

  • 2.

    Beijing Institute of Geo-exploration Technology, Beijing 102218, China

  • 3.

    Key Lab of Shale Oil and Gas Geological Survey, Chinese Academy of Geological Sciences, Beijing 100081, China

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Received Date:  20 January 2018
Revised Date:  02 November 2018
    Abstract
  • The article aims to analyze the organic geochemistry and inorganic mineral characteristics of the Lower Cambrian Niutitang Formation shale in northwestern Hunan Province. The main research methods include carbon-sulfur measurement method, rock pyrolysis method, chloroform asphalt "A" measurement method, clay mineral, and whole rock X-ray diffraction analysis method. The results show that the content of TOC in the Niutitang Formation is high, the content of "A" in chloroform asphalt is low, and the potential of generating hydrocarbon "S1+S2" is low. Most of the vitrinite reflectances Ro range from 2.3% to 3.19%, which have reached the mature stage and mainly generate dry gas. The results of biomarkers show that the n-alkane presents bimodal pattern and the medium-and high-carbon number hydrocarbons with carbon number more than C22 are dominant. With Pr/Ph average value of 0.31, the advantage of phytate is obvious, indicating the strong reduced marine sedimentary environment. The right angle diagram of Pr/nC17 and Ph/nC18 shows that the organic matter types of shale are mainly type Ⅰ and Ⅱ1; The terpene abundance order is pentacyclic triterpeneane > tricyclic terpane > tetracyclic terpene. The ratio of γ-alkane to C30 Hopane is generally greater than 0.3, indicating that its sedimentary parent materials are dominated by plankton and marine autotrophic bacteria, with part of algae; Ts/(Ts+Tm) range from 0.53 to 0.60, which is consistent with the detection results of vitrinite reflectance on maturity. The mass chromatogram of saturated hydrocarbon m/z 217 is C27 > C29 > C28 and the ratio of C27/C29 is more than 1, indicating that its parent materials are dominated by the shallow sea creatures. Pregnane, homo-pregnane, diasterane, and 4-methyl sterane were detected in all samples, indicating that they had undergone microbial degradation. Based on the above analysis results, it is proposed that shales of the Niutitang Formation in the study area have good material conditions for shale gas hydrocarbon accumulation. This research work has laid a good working foundation to carry out the shale gas exploration in the target area.
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