Abstract
The organic matter abundance, type and maturity have been studied along with their generative potential in coals, carbonaceous mudstones and mudstones from Carboniferous-Permian in Ordos Basin, revealing that the coal-bearing source rocks in the study area have the stronger generative potential. The source rocks are typically humic gas source rocks with the main source rock dominated by the coals. There are significant diversities in the generative potential in different lithological source rocks. The generative potential decreases in the following order: coals, carbonaceous mudstones, mudstones. The desmocollinite in vitrinite group shows a positive correlation with hydrogen index (IH) or S1 + S2 values, indicating the desmocollinite in coal may be the major contributor to hydrocarbon generation. On the whole, the hydrogen index and S1 + S2 values both exhibit a good relationship with the desmocollinite in carbonaceous mudstones or mudstones, whereas they have a poor correlation with the pristane/phytane ratios. The hydrogen index and S1 + S2 values in coal with the increased pristane/phytane ratios in coal both increase at first and then decrease, whereas they both have a poor correlation with the desmocollinite. These results show that the generative potential in coal is mainly related with the sedimentary environment, while the hydrocarbon generation matter is the main factor influencing the generative potential in carbonaceous mudstones or mudstones.
Highlights
IntroductionIts Upper-Paleozoic has considerable amounts of natural gas
These results show that the generative potential in coal is mainly related with the sedimentary environment, while the hydrocarbon generation matter is the main factor influencing the generative potential in carbonaceous mudstones or mudstones
According to the evaluation criteria of coal-measure source rocks raised by Liu et al (1987) [24], the coal bed in the study area are fair to good source rocks, whereas the carbonaceous mudstones and mudstones belong to the worse source rocks
Summary
Its Upper-Paleozoic has considerable amounts of natural gas. Xu et al (2009) [7] confirmed that the coal bed from Upper-Paleozoic was the main gas source in the study area, based on researching the hydrocarbon generation capacity of source rocks in Hangjinqi block. According to the evaluation on the organic matter abundance, type, maturity and hydrocarbon generation capacity, the similar conclusion was carried out by Ji et al (2013) [8]. The reasons why the main source rock in the study area is coal and the coal can generate hydrocarbon are few reported in the domestic and overseas literature
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