Aromatic hydrocarbons can diffuse from the reservoir into the sealing formation, producing a halo effect that indicates proximity to pay. Alkanes are less water soluble than aromatic hydrocarbons and therefore do not produce the same halo effect around a reservoir.
During drilling operations, advanced warning of approaching the oil reservoir can be crucial in deciding where to set casing or adjusting drilling parameters like ROP, mud weight and ECD.
Aromatic hydrocarbons can also indicate the near miss of a reservoir when the halo effect is observed but no pay encountered. This information can then be used for future well planning.
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