| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 6434907 | Marine and Petroleum Geology | 2015 | 7 Pages |
â¢Diamondoids in source rock are generated in maturity range of 0.8-1.7% EasyRo.â¢Extract is the dominant contributor of diamondoids in source rock.â¢Diamondoid indices can be used to evaluate the maturity of highly mature source rock.
Thermal maturation-related variations in the abundance and distribution of diamondoids in source rocks were investigated by thermal simulation experiments on extracts and kerogen obtained from a same marine shale, and by quantitative analysis of diamondoids within pyrolysates using highly sensitive and selective gas chromatography-triple quadrupole mass spectrometry (GC-MS-MS). The results indicate that diamondoids within the marine shale are generated mainly during 0.8%-1.7% EasyRo, generally deriving from extractable organic matter within source rocks, and are destroyed after 1.7% EasyRo to be entirely removed by ca. 3.0% EasyRo. Ternary plots of the relative distribution of diamondoids and bivariate diagrams for diamondoid parameters (e.g., DMA/MD vs. DMAI-1, and DMA/MD vs. TMAI-1) show systematic changes in diamondoids with increasing thermal maturity (expressed as EasyRo).
