| 西藏措勤盆地保吉地区上二叠统—下三叠统木纠错组显微荧光特征及油气勘探建议 |
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| 关键词:Upper Permian–Lower Triassic Mujiucuo Formation micro-fluorescence oil-gas exploration Coqen Basin |
| 基金项目:国家自然科学基金项目(编号: 41472030);科技基础性工作专项(编号: 2015FY310100);中国地质调查局基础性公益性矿产地质调查项目(编号: DD20160120-02; DD20160120-04; DD20160126);中国地质科学院基本科研业务费项目(编号: J1607) |
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| The Micro-fluorescence Characteristics of the Upper Permian–Lower Triassic Mujiucuo Formation and Suggestions for Oil-gas Exploration in Baoji Area of Coqen Basin, Tibet |
| Dolomite is the main lithologic facies of the Mujiucuo Formation at the Baoji Area, Bange County, Tibet, and the Mujiucuo Fm is exposed more than 870 meters in thickness without top and bottom. Totally 95 pieces of rock slices were investigated, the phenomenon of organic contamination was found in 22 pieces of the rock slices under the transmitted light, therefore, the author conducted microscopic fluorescence analysis on the 22 rock slices and confirmed their oiliness. Based on the above result, the author calculated the thickness of the oil-bearing layers to be about 114 m. The main fluorescent colors of the Mujiucuo Fm are yellow-green and green, minor portion are yellow or yellow-orange, and yellow-green is the most common color. Fluorescent color indicates that the types of asphalt in the rocks are mainly oily asphalt and colloidal asphalt. These bitumen distribute in the gaps, cracks or diffuse in the whole slice. Karst caves and needle holes can be seen in the outcrops. Structural crack, network-like intercrystalline pore and intergranular dissolution pore can be seen in the rock slices. According to preliminary statistics, the largest plane porosity can up to 22.7%, the minimum plane porosity is 11.8% and the average is 16.23%, therefore, the dolomite has a good porosity and connectivity. The Mujiucuo Formation in the Coqen Basin is well preserved because it is covered by Triassic, Jurassic, and Cretaceous strata in vast area. Based on the analysis of the stratigraphic distribution and structure of the study area, an oil-gas exploration model for the Mujiucuo Formation is proposed too. |
| HE Ji-fu,JI Zhan-sheng,WU Gui-chun,LIU Jing-yan,SUN Qian,SHI Qiu-yuan,LI Hao,LIU Zhen-yu,GUO An-chen,HOU Zhao-shuo,LI Dong-ze.2018.The Micro-fluorescence Characteristics of the Upper Permian–Lower Triassic Mujiucuo Formation and Suggestions for Oil-gas Exploration in Baoji Area of Coqen Basin, Tibet[J].Acta Geoscientica Sinica,39(4):463-473. |
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