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Genetic Types and Sources of Natural Gas in Linxing Area, the Eastern Margin of Ordos Basin, China(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2018年第02期
Page:
203-214
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Genetic Types and Sources of Natural Gas in Linxing Area, the Eastern Margin of Ordos Basin, China
Author(s):
ZHENG Ding-ye JIANG Fu-jie LIU Tie-shu PANG Xiong-qi CHEN Xiao-zhi SHAO Xin-he LI Long-long HUYAN Yu-ying
1. College of Geosciences, China University of Petroleum, Beijing 102249, China; 2. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petrolum, Beijing 102249, China; 3. CNOOC Research Institute, Beijing 100028, China
Keywords:
geochemistry tight sandstone gas hydrocarbon generation kinetics genetic type gas source analysis gas generation contribution rate Ordos Basin
PACS:
TE122.1;P618.130.1
DOI:
-
Abstract:
The exploration level of tight sandstone gas is low in Linxing area, the eastern margin of Ordos Basin, China, and the cognitions of geochemical characteristics and source rocks of natural gas are relatively limited. The natural gas components and carbon isotope characteristics were analyzed; the hydrocarbon generating intensities of coal rock, carbonaceous mudstone and dark mudstone were calculated by using the experiment of hydrocarbon generation kinetics; combined with the hydrocarbon generation potential of three source rocks, the calculation model for natural gas generation contribution rate of source rocks was established. The results show that the main parent material types of source rocks are Ⅲ-type and Ⅱ2-type kerogens, the organic matter has high abundance, and the source rocks are mostly in the stage of thermal maturation; the carbon isotope values of natural gas are relatively heavy, and show the characteristics of coaltype gas; the carbon isotope values of natural gas have no differentiation in the process of vertical migration, and also no inversion in the change of plane ratio, indicating the characteristics of near source and continuous injection; the natural gas mainly derives from the coal rocks of Benxi Formation-Taiyuan Formation, and the gas generation contribution rates are 43.3% and 43.8%, respectively; the natural gas has a good vertical matching relationship with source rocks, and the effective source rocks control the exploration of favorable areas of natural gas in Linxing area.

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Last Update: 2018-04-19