Identification of Thermal Maturity Relevant Organic Matter
|April 5, 2015||Filled under Com II||
Carla Araujo, Angeles Borrego, Antonis Bouzinos, Brian Cardott, Humberto Carvajal, Vongani Chabalala, Peter Crosdale, Thomas Demchuk, Cortland Eble, Deolinda Flores, Agnieszka Furmann, Thomas Gentzis, Paula Alexandra Gonçalves, Carsten Guvad, Maria Hamor-Vido, Julian Esteban Jaramillo Zapata, Iwona Jelonek, Michelle Johnston, Tatiana Juliao Lemus, Stavros Kalaitzidis, Wayne Knowles, Jolanta Kus, Zhongsheng Li, Martha Rocio López Cely, Maria Mastalerz, João Graciano Mendonça Filho, Seare Ocubalidet, Richárd Orbán, Walter Pickel, Paddy Ranasinghe, Joana Ribeiro, Jaques Schmidt, Abbas Seyedolali, Neil Sherwood, George Siavalas, Isabel Suárez-Ruiz, Brett Valentine Carlos Vargas Vargas, Nicola Wagner, Ronald Wilkins, Bree Wrolson.
The Identification of Primary Vitrinite WG (now Identification of Thermal Maturity Relevant Organic Matter WG) was created at the Oviedo meeting in 2008 with the aim of providing guidelines for identification and reflectance measurement of the thermal maturity relevant population in dispersed organic matter. Previous results from Commission II regarding the qualification of vitrinite particles for measurement and the reappraisal of vitrinite reflectance measurements for a variety of source rocks have shown that the major problem associated with the measurement of vitrinite reflectance in dispersed organic matter is the identification of the primary vitrinite population. This has proven to be particularly difficult in low maturity organic-rich oil shales (Borrego et al., Int. J. Coal Geol. 68; 2006).
Results of the Identification of Thermal Maturity Relevant Organic Matter working group since 2008 have shown that measurement of reflectance and the differentiation of solid bitumen from vitrinite in shale of all thermal maturities remains an important problem. Resolving this issue is intended to improve interlaboratory reproducibility of reflectance measurements in shale, regardless of whether the reflectance of vitrinite or solid bitumen or another organic matter type is selected as representative of thermal maturity.
Although the success of the ICCP’s dispersed organic matter vitrinite reflectance (DOMVR) accreditation program suggests that most petrographers are following a common methodology, until 2011 there was no standard test method for the reflectance measurement of dispersed vitrinite to guide analysts. This need was addressed by the members of this WG through the creation of ASTM D7708-11 Standard test method for microscopical determination of the reflectance of vitrinite dispersed in sedimentary rocks. This new test method has since been adopted by ICCP members, e.g., within the DOMVR accreditation program, and citation of the test method is now common in peer-reviewed literature. A standing goal of this working group is to update the ASTM test method as the need arises and to improve its precision limits by further round robin interlaboratory studies.
- Call to join the WG (Extract ICCP News 45)
- WG Questionnaire
- WG Report (2009; Extract ICCP News 48)
- WG Report (2009)
- Hackley et al. – (Abstract) New ASTM Standard Test Method for Determination of the Reflectance of Vitrinite Dispersed in Sedimentary Rocks
- Hackley et al. – (Abstract) New ASTM standard test method D7708-11 for determination of the reflectance of vitrinite dispersed in sedimentary rocks
- WG Report (2011; Extract ICCP News 53)
- WG Report (2011)
- Publication of ASTM D7708 Standard Test Method for Microscopical Determination of the Reflectance of Vitrinite Dispersed in Sedimentary Rocks
- Report IPV Hackley 2013
- 1st Interlaboratory Study for ASTM D7708 Test Method for Dispersed Vitrinite Reflectance
- Hackley et al 2015 JMPG
- 2015 WG Report
- 2nd Interlaboratory Study for ASTM D7708 Test Method for Dispersed Vitrinite Reflectance
- Results of 2015-2016 interlaboratory study v2.0
- 2016 WG Report
- Hackley et al 2020 JMPG (non ICCP members please contact Paul Hackley)