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《Geochimica》 2012-01
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Biological organic source and depositional environment of over-mature source rocks of Longtan Formation in Sichuan basin

ZHU Yang-ming1,GU Sheng-xiao1,LI Ying1,HAO Fang2,ZOU Hua-yao3 and GUO Tong-lou4 1.Department of Earth Sciences,Zhejiang University,Hangzhou 310027,China;2.China University of Geosciences,Wuhan 430074,China;3.College of Earth Sciences,China University of Petroleum,Beijing 102249,China;4.SINOPEC Exploration Southern Company,Chengdu 610041,China  
The source rocks of Longtan Formation in Sichuan basin have vitrinite reflectance values ranging mostly from 2.0% to 3.0% and kerogen H/C atomic ratios mainly in 0.3 to 0.5,suggesting a post-mature level with regard to hydrocarbon-generating.Distribution of their various biomarkers is found to change abnormally and could be limited to geochemical applications.However,their aromatic hydrocarbons,in conjunction with kerogen carbon isotope and element(sulfur and nitrogen) composition,can be used as indicators for organic source and sedimentary environment.Near-marine swamp-lacustrine facies coal-bearing source rocks in the southeastern Sichuan basin show 2,6-/2,10-DMP(dimethylphenanthrene) and 1,7-/1,9-DMP values higher than 0.65 and 3.0 respectively and 4-/1-MDBT(dibenzothiophene) ratios over 15.The kerogens exhibit isotopically heavy δ13C values mostly in excess of –25‰,along with low S/C and N/C atomic ratios(0.003 to 0.056 and 0.012 to 0.025,respectively).The combined data indicate a dominantly terrestrially derived source and oxidizing depositional environment with a type-Ⅲ organic matter.Whereas,the bay-lagoon facies intervals in the northeastern region of this basin display 2,6-/2,10-DMP ratios lower than 0.65,1,7-/1,9-DMP mainly below 3.0 and 4-/1-MDBT mostly under 5.Moreover,carbon isotopes of the kerogens are relatively depleted in 13C with the δ13C values around –27‰,with slightly higher S/C and N/C ratios(0.020 to 0.140 and 0.014 to 0.038,respectively),implying a type-Ⅱ kerogen derived from a predominantly aquatic organic source deposited in a reducing or less oxic condition.These geochemical parameters for source rocks from other parts in this basin are believed to vary between the two regions.
【Fund】: 国家科技重大专项课题专题(2008ZX05005-03-02)
【CateGory Index】: P618.13
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