Preliminary Study on Relations between Methane Carbon Isotopic Fractionation and Accumulation of Natural Gas of Lower Paleozoic in the Center of Ordos Basin, China

Abstract:

Carbon isotopic fractionation frequently occurs during the process of source rocks generating hydrocarbon and its migration through the pore media. Conversely, the recorded isotopic information reflects some physical and chemical characteristics of the rocks, such as porosity, permeability and thermal evolution, etc. In this paper, based on the preliminary analysis of methane carbon isotopic fractionation of Lower Paleozoic in the center of Ordos Basin, China, some reservoir-forming factors like thermal evolution centers, gas pool margins, gas migration directions and the favorable accumulation zones were roughly identified. The results show the hydrocarbon-generating centers located in the Yanan-Jingbian area, the gas migrating direction from southeast to northwest, and the gas reservoir bounded by the lower permeable zone of Wuqi-Suligemiao-Yulin-Jiaxian. Finally, the isotopic results are supported by the otherss special research conclusions of source rock maturity and lithofacies palaeogeography. Therefore, the suggested viewpoints about carbon isotope in this paper have higher reliability.

• Periodical: Applied Mechanics and Materials (Volume 318)
• Pages: 477-481
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.318.477
• Online since: May 2013
• Authors: Yun Feng Zhang
• Keywords: Carbon Isotopic Fractionation, Gas Accumulation, Lower Paleozoic, Ordos Basin

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