Therefore, the iC4/nC4 ratio shows an increasing trend in migration direction, with the increase of migration distance, R 3 increases and R 4 decreases, making the migration index (ΔR 3 ) show an increasing trend as shown in eq 5 . 5 where R 3 = iC 4 /nC 4 and R 4 = iC 4 /nC 3 .
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Gas-Water Distribution and Gas Reservoirs Accumulation Properties of Upper Paleozoic Sequence in the Western Yishan Slope, Ordos Basin, NW China.
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