Abstract
The source rocks of natural gas of Jingbian gas field in Ordos Basin, China are unclear and the origin of oil-derived gas is controversial. Based on series of experiments on source rock evaluation including TOC, Rock-Eval pyrolysis, carbon isotope composition of kerogen, chloroform bitumen A, maceral compositions, gas chromatograms, we evaluated the hydrocarbon generation potential of the possible source rocks. We also conducted the components and stable carbon isotopes of natural gas and compared geochemical characteristics of natural gas and source rock-adsorbed gas. The results indicate that source rocks from Lower Permian Taiyuan Formation have some hydrocarbon generating capability, but far less than its proximate Carboniferous and Permian coal measures. Oil-derived gas originated from Lower Permian Taiyuan Formation limestone was expulsed to the Majiagou Formation by coal-derived gas generated from the Carboniferous and Permian coal measures. The former two gases mixed in the Majiagou Formation above the gypsum-salt bed. Source rocks from Majiagou Formation above the gypsum-salt bed experienced much more weathering, leaching and oxidation compared with those of under the gypsum-salt bed, suggesting that the latter are comparatively better than the former.
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