The Late Palaeozoic sedimentary systems and humic gas pools in the Ordos Basin

The Late Palaeozoic humic gas pools in the Ordos Basin are believed to be the lithologic gas pools within the stratigraphic traps. The distribution of hydrocarbon reservoirs is generally governed by the fluvial and deltaic-depositional systems, especially by those in the second member of the Shanxi Formation and the ninth member of the Lower Shihezi Formation. These fluvial and deltaic depositional systems have been identified as the principal gas beds in the Late Palaeozoic humic gas pools in the Ordos Basin.