Evolutional History and Gas Exploration Direction of the Nose-Like Structural Belt in the Eastern Part of South Altun Slope, Qaidam Basin
详细信息
- 责任者：Ma Xinmin (Northwest Branch ; Petroleum Exploration and Development Research Institute ; PetroChina ; Lanzhou 730020 ; China) ; Zhao Mingjun
- 刊名：Natural Gas Industry
- 出版年：2013
- 卷期：33(5)
- 关键词：构造鼻 ; structural nose ; 油气勘探 ; petroleum exploration ; 柴达木盆地 ; Qaidam Basin
- 页码：p.19-23
- 图表：illus., 14 refs.
- 分类号：1003
- issnNo：ISSN1000-0976
- isbnNo：CN51-1179/TE
摘要
In 2011,industrial gas flow in the Paleocene-Eocene Lulehe Formation was obtained in the exploratory well Dongping-1 on the Dongping structure drilled by Petrochina Qinghai Oilfield Company,and this verifies the oil/gas potential of the nose-like structural belt in the eastern part of south Altun slope in the Qaidam Basin.In order to identify key target areas for future exploration,the newly processed seismic data and drilling information were used to analyze the geologic structure in this study area.The nose-like structure belt was divided into 4 zones from the orogenic belt to the center of this basin,namely piedmont high fault terrace zone,middle slope zone,low wrench uplift zone and deep depressed zone.Based on the regional geologic data and tectonic stress field variation,the evolution of the nose-like structure zone since the Cenozoic was divided into 3 periods.First,during the Early Himalayan Tectonic Period(from K to the end of N1),the tectonic inversion and right-lateral compress-shear strike slip resulted in the stage-Ⅰ NW-trending fault,which controlled the distribution of deep sags and paleo-uplifts.Second,during the Middle Himalayan Tectonic Period(from N21 to N23),the activity of the Altun fault was transformed into left lateral compress-shear strike slip,resulting in the formation of the stage-Ⅱ NE-trending fault and development of low wrench uplift.Third,during the Late Himalayan Tectonic Period(from the end of N23 to Q),the Altun fault experienced strong overthrusting,leading to the formation of the stage-Ⅲ imbricated thrust in parallel to the piedmont as well as the high fault terrace and middle slope.In the end,the analysis of source-reservoir-cap combination and hydrocarbon accumulation conditions reveal that the high fault terrace zone and low wrench uplift zone are favorable target areas for future exploration.
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