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| Estimation of relative contributions of different hydrocarbon charges to Gasi Oilfield accumulations, Southwestern Qaidam Basin |
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GUI Lili1,2, LIU Keyu1,2,3, WANG Yuxiong4, CHEN Xiaolei5, YUAN Li6, MENG Qingyang1,2, LI Xiuli1,2
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(1.PetroChina Exploration and Development Research Institute, Beijing 100083, China;2.Key Laboratory of Basin Structure and Petroleum Accumulation, CNPC, Beijing 100083, China;3.School of Geosciences in China University of Petroleum, Qingdao 266580, China;4.CNPC Nile Company, Beijing 100034, China;5.Geological Institute of Shengli Oil Production Plant, Shengli Oilfield, SINOPEC, Dongying 257000,China;6.PetroChina Exploration and Development Research Institute, Qinghai Oilfield, Dunhuang 736202, China)
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| Abstract: |
| The Gasi E31 Oilfield, Southwestern Qaidam Basin, is an important petroleum exploration region in the basin. The hydrocarbon charge history of the Gasi Oilfield in the Qaidam Basin, Western China was investigated using a suite of fluid inclusion techniques, including fluid inclusion petrography, fluorescence spectroscopy, FT-IR spectroscopy and microthermometry. The study was facilitated by a detailed reservoir diagenesis investigation using optical microscopy, cathodeluminescence microscopy, SEM and XRD. The results show that the reservoir fluids evolved from alkali to acidic, and then alkalic. There were two episodes of oil charge in N1～ N22, as reflected by three types of hydrocarbon inclusions, occurring around 28 Ma and 8 Ma, respectively. The current accumulations in the oilfield are of similar maturity and API gravity with the current oil accumulation derived from upward migration of palaeo-oil reservoirs in the depth. |
| Key words: diagenetic sequence fluid inclusions spectrographic method hydrocarbon charge history Gasi E31 Oilfield Southwestern Qaidam Basin |
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