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Using rock-eval S4Tpeak as thermal maturity proxy for shales by Bodhisatwa Hazra; Deependra Pratap Singh; Prasenjeet Chakraborty; Pradeep K. Singh; Santi Gopal Sahu; Ashis K. Adak is a Earth and Planetary Sciences article available to read on EtoBox.

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The Rock-Eval pyrolysis-stage derived parameters such as free hydrocarbons (S1), heavier pyrolysishydrocarbons (S2), pyrolyzable carbon (PC) and pyrolysis T max (from S2 curve) have received considerable interest for source-rock screening and thermal maturity assessment. On the other hand, the Rock-Eval oxidationstage S4CO 2 curve, which gives the amount of residual carbon (RC), only recently has received some interest. While the pyrolysis-stage S2 temperature-peak (T max ) is conventionally used as a maturity proxy, in this work we show that the temperature-peak of S4CO 2 curve (S4T max ) can also be used as a thermal maturity proxy for shales. For overmature and low-TOC shale samples, showing asymmetric S2 shape and concomitantly producing doubtful T max , the S4 curves showed symmetric nature and consequently the S4T max was observed to be a reliable thermal maturity estimate. While the S4T max clearly resolved immature and overmature shales, for the early mature and peak mature shales the S4T max showed overlapping values. S4T max of pre-pyrolyzed and pyrolyzed masses showed good positive correlation with differential scanning calorimetry temperature-peak (DSCT peak ), and cons

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Author

Bodhisatwa Hazra; Deependra Pratap Singh; Prasenjeet Chakraborty; Pradeep K. Singh; Santi Gopal Sahu; Ashis K. Adak

Publisher

Elsevier BV

Published

2021

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)