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Origin and quantitative source assessment of deep oils in the Tazhong Uplift,Tarim Basin
Institution:1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China;2. Institute of Earth Sciences, The Hebrew University, Jerusalem 91904, Israel;3. Tarim Oilfield Company, PetroChina, Korla, Xinjiang 841000, China;1. Key Lab of Petroleum Geochemistry, CNPC, Beijing 100083, China;2. State Key Lab for Enhancing Oil Recovery, Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China;3. School of Energy Resource, China University of Geosciences, Beijing 100083, China;4. Department of Geoscience, University of Calgary, 2500 University Drive NW, Calgary AB T2N 1N4, Canada;1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Changping District, Beijing 102249, PR China;2. College of Geoscience, China University of Petroleum, Changping District, Beijing 102249, PR China;1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Changping District, Beijing, 102249, China;2. College of Geosciences, China University of Petroleum, Beijing, 102249, China;3. Research Institute of Exploration and Development, Tarim Oilfield Company, PetroChina, Korla, Xinjiang, 841000, China;1. PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China;2. PetroChina Tarim Oilfield Company, Korla, Xinjiang 841000, China;1. Key Lab of Petroleum Resources Research, Institute of Geology and Geophysics, CAS, Beijing 100029, China;2. Key Lab of Exploration Technologies for Oil and Gas Resources of Ministry of Education, Yangtze University, Wuhan 430100, China;3. Institute of Earth Sciences, Hebrew University, Jerusalem 91904, Israel;4. Liverpool University, Department of Earth, Ocean and Ecological Sciences, Liverpool, Merseyside L69 3GP, UK;1. Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China;2. Colorado School of Mines, Golden, CO 80401, USA;3. China University of Petroleum (Beijing), Beijing 102249, China;4. Research Institute of Petroleum Exploration and Development, Tarim Oilfield Company, PetroChina, Korla 841000, China
Abstract:A large amount of deep oil has been discovered in the Tazhong Uplift, Tarim Basin whereas the oil source is still controversial. An integrated geochemical approach was utilized to unravel the characteristics, origin and alteration of the deep oils. This study showed that the Lower Cambrian oil from well ZS1C (
></figure><sub>1x</sub>) was featured by small or trace amounts of biomarkers, unusually high concentration of dibenzothiophenes (DBTs), high δ<sup>34</sup>S of DBTs and high δ<sup>13</sup>C value of <em>n</em>-alkanes. These suggest a close genetic relationship with the Cambrian source rocks and TSR alteration. On the contrary, the Middle Cambrian oils from well ZS1 (<figure class=></figure><sub>2a</sub>) were characterized by low δ<sup>13</sup>C of <em>n</em>-alkanes and relatively high δ<sup>34</sup>S of individual sulfur compounds and a general “V” shape of steranes, indicating a good genetic affinity with the Middle–Upper Ordovician source rocks. The middle Cambrian salt rock separating the oils was suggested to be one of the factors responsible for the differentiation. It was suggested that most of the deep oils in the Tazhong Uplift were mixed source based on biomarkers and carbon isotope, which contain TSR altered oil in varied degree. The percentage of the oils contributed by the Cambrian–Lower Ordovician was in the range of 19–100% (average 57%) controlled by several geological and geochemical events. Significant variations in the δ<sup>34</sup>S values for individual compounds in the oils were observed suggesting a combination of different extent of TSR and thermal maturation alterations. The unusually high DBTs concentrations in the Tazhong-4 oilfield suggested as a result of mixing with the ZS1C oil (<figure class=></figure><sub>1x</sub>) and Lower Ordovician oils based on δ<sup>34</sup>S values of DBT. This study will enhance our understanding of both deep and shallow oil sources in the Tazhong Uplift and clarify the formation mechanisms of the unusually high DBTs oils in the region.</td>
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Keywords:Biomarker  Dibenzothiophene  Compound specific carbon/sulfur isotope  Mixed source oil  Quantitative assessment  TSR
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