| Earth Science |
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| Hydrocarbon charging histories of the Ordovician reservoir in the Tahe oil field, Tarim Basin, China |
| LI Chun-quan, CHEN Hong-han, LI Si-tian, ZHANG Xi-ming, CHEN Han-lin |
| Department of Earth Science, Zhejiang University, Hangzhou 310027, China; Institute of Resources, China University of Geosciences, Wuhan 430074, China; Planning and Designing Institute of Northwest Petroleum Bureau, SINOPEC, Urumqi 830011, China |
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Abstract The Ordovician reservoir of the Tahe oil field went through many tectonic reconstructions, and was characterized by multiple hydrocarbon chargings. The aim of this study was to unravel the complex charging histories. Systematic analysis of fluid inclusions was employed to complete the investigation. Fluorescence observation of oil inclusions under UV light, and microthermometry of both oil and aqueous inclusions in 105 core samples taken from the Ordovician reservoir indicated that the Ordovician reservoir underwent four oil chargings and a gas charging. The hydrocarbon chargings occurred at the late Hercynian, the Indo-Sinian and Yanshan, the early Himalaya, the middle Himalaya, and the late Himalaya, respectively. The critical hydrocarbon charging time was at the late Hercynian.
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Received: 30 September 2003
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