Journal
JOURNAL OF ASIAN EARTH SCIENCES
Volume 79, Issue -, Pages 468-476Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jseaes.2013.09.034
Keywords
Paleoenvironment; Source rock; Dingqinghu and Niubao Formations; Lunpola Basin; Tibet; Organic geochemistry
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Funding
- Fundamental Research Funds for the Central Universities [2011PY0238]
- National Natural Science Foundation of China [41172129]
- National Petroleum Resources Special Project: Strategic Investigation and Geological Survey on Oil and Gas Resources in Tibet Plateau [1212011221103]
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This paper reports on the depositional paleoenvironment and the potential hydrocarbons of the EoceneOligocene black shales from the Dingqinghu and Niubao Formations in the Lunpola Basin, central Tibet. Nineteen samples from two outcrop profiles were analysed. The contents of the total organic carbon (TOC) and sulphur were measured; other analyses included Rock-Eval pyrolysis, solvent extraction and gas chromatography-mass spectrometer (GC-MS). The results indicated that the shales from the Dingqinghu and Niubao Formations are thermally immature. The pyrolysis data show that the shales contain Type I organic matter and that lacustrine algal are the main organic matter sources. The low pristane to phytane ratios and the high gammacerane indices indicate that the shales were deposited in a reducing, stratified, and hypersaline palaeo-lake, which is consistent with the climate information provided by the development history of palaeo-lakes from the Eocene to the Oligocene epochs. (C) 2013 Published by Elsevier Ltd.
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