Relationships among geochemical indices of coal and carbonaceous materials and implication for hydrocarbon potential evaluation

摘要: A worldwide dataset of organic material from 553 samples belonging to coal and carbonaceous materials was used analyze the evolution hydrogen index (HI) bitumen (BI) with increasing thermal maturity. Basic statistical analyses were applied detect boundary lines HImax BImax in delineating upper lower limits HI BI bands for majority samples. In addition, cross-plots or versus maturity (Ro% T max) also provide criteria defining lines. The constructed are broad at low maturities become narrower maturities. petroleum generation potential is completely exhausted vitrinite reflectance 2.0–2.2% max 510–520°C. An increase implies extra which related changes structure materials. declining means that oil expulsion window starts occur range 0.75–1.05%. can be divided into four different areas based on cross-plot Ro%. highest area located section II Ro = 0.6–1.0% HI > 100. rapidly III Ro > 1.0%. This result accordance curve regression Ro% 80 Ro = 1.02–3.43% (R 2 = 0.72). Overall, total extended up Ro = ~1.25–1.95%. Finally, S1 S2, shale C-shale exhibits a higher slowly decreased slope, compared then sharply increased slope samples, attributable their compositional difference material.