Method for screening carbonate rock hydrothermal fluid U-Pb dating sample

Abstract

The invention belongs to the field of oil-gas exploration, and discloses a method for screening a carbonate rock hydrothermal fluid U-Pb dating sample. The method comprises the following steps: collecting a hydrothermal dolomite sample; selecting samples with relatively developed dolomite and calcite in the collected hydrothermal dolomite samples, determining the positions of grinding sheets on the samples, and respectively grinding a first sheet, a second sheet and a third sheet; determining the crystallization degree and the crystal form of the dolomite and the calcite of the first slice and the contact mode of the matrix surrounding rock; determining an annulus structure formed inside the second sheet of dolomite and calcite under the influence of the heated liquid fluid; based on the steps, positions where the dolomite and the calcite develop well are marked on the third slice, the U-Pb content in the dolomite and the calcite at the marked positions is analyzed, and a sample with the high U and Pb content is selected as the carbonate rock hydrothermal fluid U-Pb dating sample. According to the method, the rock sample which is related to the carbonate rock hydrothermal fluid activity and is relatively high in U-Pb content can be screened at high quality.

Description

technical field [0001] The invention belongs to the field of oil and gas exploration, and more specifically relates to a method for screening carbonate hydrothermal fluid U-Pb dating samples. Background technique [0002] The research on hydrothermal dolomite abroad began in the 1980s, and the attention and research on hydrothermal dolomitization and the resulting hydrothermal dolomite reservoirs have been increasing day by day, gradually becoming a new upsurge (Cervato, 1990 ; Qing and Mountjoy, 1992, 1994; Machel, 2004; Lavoie et al., 2005; Davies and Smith, 2006; Hendry et al., 2015; Barale et al., 2016; Ramkumar et al., 2019). More and more research examples have proved that hydrothermal dolomites related to tectonic activities are ubiquitous in the stratigraphic records of many regions of the world, such as the Devonian Jean Marie Formation in the Western Canadian Sedimentary Basin (Wendte et al. , 2006), the Swan Hill Formation (Davies and Wendte, 2005) and the Missis...

AI Technical Summary

Problems solved by technology

[0005] CN108956747A discloses a water vapor-assisted laser ablation non-matrix matching accessory mineral U-Pb dating method, which introduces carrier gas and water vapor into the laser ablation pool together, thereby eliminating the matrix effect during U-Pb age analysis between different accessory minerals, It solves the bottleneck problem that the U-Pb age analysis of specific accessory minerals cannot be performed due to the lack of suitable standard samples, which belongs to the transformation of dating instruments

[0006] Most of the current methods are the improvement of dating instruments or the use of zircon samples to explore clastic rock dating methods, but no targeted sample selection work has been proposed for carbonate rock dating. Therefore, it is urgent to propose a selection method. A method for U-Pb dating samples of hydrothermal fluids suitable for carbonate rocks

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