Asked 15th Dec, 2015

Is there a possibility to estimate organic matter maturity level?

I need to estimate LOM value to calculate TOC using Δ log R method

All Answers (3)

15th Dec, 2015
Rafik Karaman
Al-Quds University
Dear Mohamed,
Attached please find a publication entitled " Accurate, Direct Total Organic Carbon (TOC) Log from a New Advanced Geochemical Spectroscopy Tool: Comparison with Conventional Approaches for TOC Estimation" that covers the answer to your question.
I have copied equation 5 (see below) that depicts the correlation between the parameters of concern.
TOC = (Δ log R) × 10(2.297 – 0.1688LOM)  (5)
where LOM is the level of organic maturity (Hood et al., 1975). The LOM can be determined from a variety of measurements including
vitrinite reflectance, Tmax, or Rock Eval if the type of organic matter is known. Therefore, if two formations have the same Δ log R values but
different LOM values, estimated TOC will be different. However, in over-mature shale reservoirs with LOM values greater than 10.5, the limit
of calibration of maturity to TOC is reached. In these formations, a LOM value of 10.5 should be used (Passey et al., 2010).
Hoping this will be helpful,
2 Recommendations
16th Dec, 2015
Mohamed Mehdi Kadri
Université Kasdi Merbah Ouargla
Dear Rafik,
Many thanks for your interested answer and paper, so as i have a shale in dry gas phase(over mature) i will use LOM value 10.5?
4th Jan, 2016
Abdul Ghafoor
Institute of soil and environment sciences, university of agriculture, faislabad
Very good reply.

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