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Academic Journal of Environment & Earth Science, 2024, 6(2); doi: 10.25236/AJEE.2024.060209.

Fluid inclusion characteristics and significance of the QZ7 Well in eastern Qiangtang Basin

Author(s)

Hong Kuibin1,3,4, Xie Yuan2, Song Chunyan3,4

Corresponding Author:
Hong Kuibin
Affiliation(s)

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

Abstract

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 &gt. 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.

Keywords

Qiangtang Basin, Fluid inclusions, Bagong Formation, Borilla Formation

Cite This Paper

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.

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