Ch.9 Diagenesis , Catagenesis , & Metagenesis

Ch.9 Diagenesis, Catagenesis, &Metagenesis http://dnr.louisiana.gov/assets/TAD/education/BGBB/3/transformation.html

http://www.ems.psu.edu/~pisupati/ACSOutreach/Petroleum_2.htmlhttp://www.ems.psu.edu/~pisupati/ACSOutreach/Petroleum_2.html

http://aapgbull.geoscienceworld.org/cgi/content-nw/full/92/8/1077/FG3http://aapgbull.geoscienceworld.org/cgi/content-nw/full/92/8/1077/FG3 The changes in H/C and O/C atomic ratios for the pyrolysis of the Cameo coal from the Twin Arrow 4-14 C&K well as shown on a Van Krevelen diagram indicate that the simulated maturation of the coal follows the natural evolution trend for type III kerogen. The two faint dotted lines running from about 1.7 and 0.7 on the y axis to 0.18 and 0.14 on the x axis represent the stage boundaries of organic matter transformation from diagenesis to catagenesis and from catagenesis to metagenesis, respectively

Types of Kerogen

https://spec2000.net/11-vshtoc.htm

http://www.chemterra.com/resource-play-consulting/

https://www.spec2000.net/17-specshoil.htm http://spe-sc.ft.ugm.ac.id/w/wp-content/uploads/210.jpg

Diagenesis • H보다 O가 주로 감소 (C=O 제거를 통해) • Ro ≤ 0.5% • Magnetic susceptibility χ ≤5*10-9 emu CGS/ g OC • Catagenesis • H, H/C 급격히 감소탄화수소(석유) 발생 • 잔류 C=O 제거 • Main oil generation zone/Beginning of cracking zone (wet gas) • Aliphatic 감소, aromatic (napthene ring) 증가  aromatization • Ro≒ 0.5-2% • χ ≒50-60*10-9emu CGS/ g OC • Metagenesis • H 감소 둔화, H/C ≤ 0.5 • Aliphatic, C=O 사라짐 • Ro≥ 2% • χ최대치에 도달한 후 다시 감소 • Dry gas zone

Ch.9 Diagenesis , Catagenesis , & Metagenesis