| 柴西南昆北断阶带油气运移特点 |
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| 关键词:migration of petroleum unconformity fault sealing effective transporting beds Qaidam Basin |
| 基金项目:中石油青海油田公司与中国石油大学(北京)联合研究项目“柴西南区典型油气输导体系分析及预测研究”(编号: QHKT/JL-03-013) |
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| 摘要: |
| Migration of Petroleum in Kunbei Faulted Terrace of Qaidam Basin |
| In Kunbei area of southwestern Qaidam Basin, new oilfields were discovered recently in the unconformity of the basement. The problem as to where and how the petroleum migrates from the sources into Kunbei area is analyzed in this paper based on the analysis of the characteristics of transportation beds and the occurrence of the oil shows. It is concluded that the unconformity transportation beds in Kunbei area are composed of two parts: Paleogene bottom gravel bed and weathering layer of the basement, and there exist two types of transportation of unconformity: single channel and double channels. The petroleum migrates along the structure ridges of the unconformity transportation beds to the high places; however, the migration routes would be disturbed and changed by some non-sealing faults, and this depends on the angle of the directions between the faults and the main stress. Most NNE- and NE-trending faults are laterally sealed and vertically unsealed, along which the petroleum would migrate vertically and in parallel form. Since the thinning and shortening of the sandstone beds in the Paleogene, their role of transportation has been limited to the area where faults are developed and where the sandstones are adjoining and connected with the unconformity. |
| GAO Xian-zhi,SUN Lei,WANG Li-qun,CAI Mo-lun,ZHANG Guo-qing,JIANG Zhi-li.2014.Migration of Petroleum in Kunbei Faulted Terrace of Qaidam Basin[J].Acta Geoscientica Sinica,35(1):93-100. |
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