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→Correlation processes
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| Use samples that have suffered as little postgenetic transformation as possible
| Use samples that have suffered as little postgenetic transformation as possible
| Postgenetic transformations—especially biodegradation, cracking, and gas stripping of oils—can make positive correlations very difficult. Also, all oil–source rock correlations are complicated by the fact that significant compositional changes occur as the oil is expelled from the source rock and migrates.
| Postgenetic transformations—especially biodegradation, cracking, and [ http://www.gazprominfo.com/terms/topping-gas/ gas stripping] of oils—can make positive correlations very difficult. Also, all oil–source rock correlations are complicated by the fact that significant compositional changes occur as the oil is expelled from the source rock and migrates.
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| Use source rock samples that are mature, not postmature
| Use source rock samples that are mature, not postmature