Analytical Limitations of Conventional Gas Equipment

• TGD records total combustible hydrocarbons without compound specificity
• GC generally analyzes gas-range alkanes (paraffins), which react similarly to subsurface processes. Other two major classes of hydrocarbons (naphthenes and aromatics) not recorded
• Generally poor performance on C5+ at low concentration
• Analysis of inorganic compounds (e.g., CO2, sulfur species, He) requires special equipment
• Difficult to account for drilling additives and/or OBM
• Inflexible to specific needs of individual wells