Academic Journal of Environment & Earth Science, 2024, 6(2); doi: 10.25236/AJEE.2024.060209.
Hong Kuibin1,3,4, Xie Yuan2, Song Chunyan3,4
1Chengdu University of Technology, Chengdu, 610059, China
2China Geological Survey Military-civilian Integration Geological Survey Center, Chengdu, 610036, China
3Chengdu Center, China Geological Survey (Geosciences Innovation Center of Southwest China), Chengdu, 610218, China
4Key Laboratory for Sedimentary Basin and Oil and Gas Resources, Ministry of Natural Resources, Chengdu, 610218, China
The Upper Triassic is one of the most important oil and gas exploration targets in the Qiangtang Basin, and it is also the main target of the upcoming oil and gas battle in the Qiangtang Basin, but the oil and gas charging period and accumulation process of the target layers are still unclear. Therefore, in this paper, the upper Triassic Bagong Formation and Borilla Formation of Qiangzi 7 well with good oil and gas display were studied, and the fluid inclusion measurement and microfluorescence were carried out. The results show that the host minerals of Bagong Formation and Borilla formation contain two kinds of quartz and calcite, and five kinds of fluorescence are orange yellow, yellow green, green, light blue and blue, showing the characteristics of hydrocarbon charging at different mature stages. The homogenization temperature ranged from 23.4 ℃ to 343.4℃, and the three phases of oil and gas charging fluid were divided into 30~70℃, 110~120℃, 140~180℃ and the first phase >. Hydrothermal fluid activity at 210°C. Combined with the buried history, it is inferred that the area experienced three stages of oil and gas charging and accumulation in the Middle Jurassic Batong (about 165Ma), Oligocene to early Miocene (about 30-20Ma) and early Pliocene (about 5Ma). The multi-stage oil and gas charging and accumulation of Qiangzi 7 well further indicates that the Upper Triassic oil and gas target layer in the Qiangtang Basin has a very broad oil and gas exploration prospect.
Qiangtang Basin, Fluid inclusions, Bagong Formation, Borilla Formation
Hong Kuibin, Xie Yuan, Song Chunyan. Fluid inclusion characteristics and significance of the QZ7 Well in eastern Qiangtang Basin. Academic Journal of Environment & Earth Science (2024), Vol. 6, Issue 2: 66-72. https://doi.org/10.25236/AJEE.2024.060209.
[1] Ou Guangxi, Li Linqiang, Sun Yumei. Theory and practice of fluid inclusions in sedimentary basins [J]. Bulletin of Mineralogy, Petrology and Geochemistry,2006(01):1-11.
[2] You Bing, Ni Zhiyong, Wang Xuejun, et al. Fluid inclusion characteristics and hydrocarbon accumulation periods of the third member of Shahejie Formation in Dongying Sag [J]. Chinese Journal of Geochemistry, 2018, 43 (4): 72-72.
[3] Lu Huanzhang, Fan Hongrui, Ni Pei. Fluid inclusion [M]. Beijing: Science Press, 2004:72-268.
[4] Cheng Kezhang, Cui Junping, Meng Zhangyong, et al. Fluid inclusion characteristics and hydrocarbon accumulation periods of Yan 'an Formation in Wuqi Area, Ordos Basin [J/OL]. Geology of China :1-19.
[5] Zheng Hui, BAI Yubin, HAO Xiaorong, Cao Qing, Liu Peng. Fluid inclusion characteristics and accumulation time of Chang 9 reservoir in Ansai Area, Ordos Basin [J]. Lithologic Reservoirs, 2013,25(06):79-83.
[6] Zhang Wenhuai, Chen Ziying. Geology of Fluid inclusions [P]. Wuhan: China University of Geosciences Press. 1993.
[7] Li Xiaojia, Deng Bin, Liu Shugen, et al. Multi-phase fluid activity of Wufeng-Longmaxi Formation in west Nanning area, Sichuan [J]. Lithologic Reservoirs,2021,33(06):135-144.
[8] Feng Jierui, Leng Jigao, Zhu Li et al. Lithologic Reservoirs,2011,23(05):38-42. Application of fluid inclusion to determine gas accumulation periods of Xujiahe Formation in Hexingchang area [J]. Lithologic Reservoirs, 2011, 23(05):38-42.
[9] Wang Jian, Song Chunyan, Fu Xiugen, et al. Scientific drilling project of Well Qiangke 1 in Xizang Plateau [M]. Beijing: Science Press, 2009,202:1-483.
[10] Wu Xinhe, Wang Chengshan, Hu Jianhong, et al. Mesozoic petroleum system in Qiangtang Basin [J]. Xinjiang Petroleum Geology,2004(05):474-478.
[11] Song Chun-Yan, WANG Jian, FU Xiu-gen, Chen Wen-bin, XIE Shan-ke, HE Li. Source rock characteristics and significance of Upper Triassic Bagong Formation in eastern Qiangtang Basin [J]. Journal of Northeast Petroleum University,2018,42(05):104-114+11-12.
[12] Song Chunyan, Wang Jian, Fu Xiugen, et al. Tectonic characteristics of the Bolzanglongba anticline and its petroleum geological significance in Qiangtang Basin [J]. Geotectonica et Metallogenia, 2012,36(01):8-15.
[13] Li Bo, Cui Junping, Li Ying et al. Hydrocarbon accumulation stages of Yanchang Formation in Wuqi area, Yishan Slope [J]. Lithologic Reservoirs,2021,33(06):21-28.
[14] Liu Wei, Liu Ruidong. Fluid inclusion characteristics and accumulation periods of Majiagou Formation in southern Ordos Basin [J]. China Petroleum and Chemical Standards and Quality, 2013, 33(24):145.
[15] Robert, H.Goldstein, T.James, Reynolds. Systematics of Fluid Inclusions Indiagenetic Minerals [M]. 1994.69-85.
[16] Wang Jian, Tan Fuwen, Li Yalin, et al. Potential analysis of hydrocarbon resources in key sedimentary basins of Xizang Plateau [M]. Beijing: Geological Publishing House, 2004:160-188.
[17] Wang Jian, Ding Jun, Wang Chengshan. Investigation and evaluation of strategic constituency of oil and gas resources in Xizang Plateau [M]. Beijing: Geological Publishing House,2009:228-232.
[18] Shi Yafeng, Tang Maocang, Ma Yuzhen. Study on the relationship between the second-stage uplift of the Xizang Plateau and the Asian monsoon [J]. Science in China (Series D: Earth Sciences), 1998(03):263-271.