ASTM-D7708 › Standard Test Method for Microscopical Determination of the Reflectance of Vitrinite Dispersed in Sedimentary Rocks
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Scope
1.1 This test method covers the microscopical determination of the reflectance measured in oil of polished surfaces of vitrinite dispersed in sedimentary rocks. This test method can also be used to determine the reflectance of macerals other than vitrinite dispersed in sedimentary rocks.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Significance and Use
The mean reflectance of the vitrinite maceral in sedimentary rocks as determined by this test method is used as an indicator of thermal maturity, that is, the progressive geochemical alteration of dispersed organic material experienced during diagenesis, catagenesis, and metagenesis. In the case of hydrocarbon source rocks, three major categories of thermal maturity are defined by vitrinite reflectance: immature (Roran ≤ 0.5%), mature (Roran ≈ 0.5-1.35%), and overmature (Roran ≥ 1.35%) with respect to the generation of liquid hydrocarbons. Thermal maturity as determined by the reflectance of vitrinite dispersed in sedimentary rocks is similar to the rank classification of coals as presented in Classification D388 and measured similarly to the reflectance of vitrinite in coal as presented in Test Method D2798. The mean reflectance of the vitrinite maceral in sedimentary rocks correlates with geochemically determined parameters of thermal maturity and can be used to characterize thermal maturation history, to calibrate burial history models, and to better understand the processes of hydrocarbon generation, migration, and accumulation in conventional and unconventional petroleum systems.
Keywords
dispersed organic matter; gas; hydrocarbons; oil; thermal maturity; vitrinite reflectance:; ICS Number Code 91.100.15 (Mineral materials and products)
To find similar documents by ASTM Volume:
05.06 (Gaseous Fuels; Coal and Coke)
To find similar documents by classification:
91.100.15 (Mineral materials and products Including earth, sands, clay, slates, stones, etc.)
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Document Number
ASTM-D7708-23A
Revision Level
2023A EDITION
Status
Current
Modification Type
New
Publication Date
Oct. 3, 2023
Document Type
Test Method
Page Count
11 pages
Committee Number
D05.28