The occurrence of bisnorhopane,trisnorhopane and 25-norhopanes as free hydrocarbons in some Australian shales |
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| Authors: | Rohinton Noble Robert Alexander Robert Ian Kagi |
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| Institution: | Petroleum Geochemistry Group, School of Applied Chemistry, WA Institute of Technology, Kent Street, Bentley 6102, Western Australia |
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| Abstract: | The triterpenoid hydrocarbons of some West Australian shales have been examined by GC-MS. In addition to the common 17α(H),21β(H)-hopanes, 17β(H),21β(H)-hopanes and 17β(H),21α(H)-moretanes, 28,30-bisnorhopane, 25,28,30-trisnorhopane and 25-norhopanes were identified in the organic extracts. In contrast, pyrolysates of the solvent-extracted sediments contained only the common hopane and moretane series, indicating that 28,30-bisnorhopane, 25,28,30-trisnorhopane and 25-norhopanes are not bonded to kerogen, but rather are present in the sediments as free hydrocarbons. |
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| Keywords: | 28 30-bisnorhopane 25 28 30-trisnorhopane 25-norhopanes hydrocarbons in shales triterpane biomarkers |
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