Abstract
The redistribution and primary migration of hydrocarbons has been investigated within two mudstone-sandstone sequences and a clayey dolomite core sample collected from Biyang Basin, China. Migration within these cores is controlled by internal properties of the bitumen such as molecular polarity and size, as well as other factors such as organic matter content in the source rock. As a result of the geochromatographic separations, a wide range of geochemical parameters, including sterane and terpane parameters, are affected to different extents. The degree of geochromatographic effects on the geochemical parameters decreases with the quality of source rocks from which the bitumens migrate.
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