| 摘要 |
The present invention is a method of interpreting sampled mud gas compositional and isotopic data from a target area in a drilling operation. The compositional and isotopic data is plotted on a chart. The chart preferably illustrates methane compositional data together with isotopic composition, such as delta<SUP>13</SUP>C<SUB>1</SUB>. From this chart, mixing lines are determined. The mixing lines are determined by finding data points plotted on the chart which approximate a straight line or other trend. The mixing lines are then analyzed to determine reservoir isotopic signature, hydrocarbon communication and any interference to this communication within the target area.
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