Relation between n -alkane distributions and effective coalification temperatures in some Permian shales

Details Relation between n -alkane distributions and effective coalification temperatures in some Permian shales Relation between n -alkane distributions and effective coalification temperatures in some Permian shales

Sep 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975gecoa..39.1237m&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 39, Issue 9, pp.1237-1243

Mathematics

Logic

Scientific paper

In Permian shales of the Sydney Basin, Australia, n -alkane distributions have been compared with effective coalification temperatures (ECTs) estimated from vitrinite reflectivities. The upper, non-marine part of the section shows evidence of progressive cracking (shift of n -alkane maximum toward shorter chains and tendency to eliminate longer chains) as depth and ECT increase; but this trend is not maintained in the underlying marine section. All samples show lack of a maximum in the longer-chain n -alkane distribution. Possible reasons discussed are (i) a cracking rate of long chains greater than their formation rate; (ii) a need for higher temperatures than the rock has so far undergone to produce a new crop of long chains; or (iii) exhaustion of the straight-chain generating potential of the kerogen. Pyrolysis experiments may be effective in testing these possibilities. The linking of ECTs to alteration stages of sediment hydrocarbons opens the possibility of comparing these stages among formations which differ in age and organic and inorganic composition, and among basins of diverse geological history.

Affiliated with

Also associated with

No associations

Rating

Relation between n -alkane distributions and effective coalification temperatures in some Permian shales does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Relation between n -alkane distributions and effective coalification temperatures in some Permian shales, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Relation between n -alkane distributions and effective coalification temperatures in some Permian shales will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-911063