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| Response of Raman spectroscopy characteristic of gas washing in Lunnan low-uplift |
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WU Nan1,2,CAI Zhong-xian2,3,YANG Hai-jun4,LIU Xian-feng1
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(1. College of Geosciences, Yangtze University, Jingzhou 434023, China;2. MOE Laboratory of Tectonics and Petroleum Resources, China University of Geosciences, Wuhan 430074, China;3. Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China;4. Research Institute of Exploration and Development, Tarim Corporation, PetroChina, Korla 841000, China)
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| Abstract: |
| The response of Raman spectroscopy characteristic of gas washing in Lunnan area was discussed by analyzing the homogenization temperature and the inclusion composition. The results show that since the Himalaya movement，the original accumulation in Lunnan area has experienced an intense invasion by the dry gas，triggering a deep revolution process of phase fractionation. The calculation results of relative depletion of n-alkanes of the oil show that the intensity of the gas washing decreases westward and the boundary of phase fractionation locates along the well LG 17 and LG100. The inclusion samples with high homogenization temperature locating in ihe eastern slope, east of the horst belt and the middle platform show an extreme priority of methane on composition, which indicates an injection by a mount of dry gas. The samples in the western slope that is far away from the gas source sag such as well LG40 and LG42 not only display a M double peak" shape of the indication of the wet gas, but also show an extreme priority of methane, which proves a dry gas invasion happened in the western slope, and the analyzing of laser Raman spectrum has extended the region of gas washing effectively. |
| Key words: Lunnan low-uplift gas washing Raman spectrum inclusion composition |
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