Method for determining quantitative classification of altered pyroclastic glutenite reservoirs

Abstract

The invention relates to a method for determining quantitative classification of altered pyroclastic glutenite reservoirs, which comprises the following steps: 1. Selecting a plurality of wall core orrock core samples in pyroclastic glutenite reservoirs, carrying out research analysis on the plurality of wall core or rock core samples, determining the clay content of the wall core or rock core samples, and distinguishing the value of the clay content; 2, determining the alteration argillization degree of the pyroclastic glutenite reservoir in the wall core or rock core sample, and classifyingthe alteration argillization degree of the pyroclastic glutenite reservoir; 3, determining the effectiveness classification of the pyroclastic glutenite reservoir; performing reservoir classificationthrough the alteration index and the reservoir quality factor, and when PI is larger than or equal to 0.05 and SH is smaller than or equal to 0.00, the reservoir is a first-class reservoir; when PI is smaller than -0.035 and SH is larger than 0.020, the reservoir is a three-class reservoir; and the reservoir between the first-class reservoir and the third-class reservoir is the second-class reservoir. According to the invention, the argillization alteration degree of the pyroclastic glutenite reservoir can be quantitatively described; moreover, a reservoir classification standard is established, and a foundation is laid for subsequent glutenite reservoir well logging evaluation.

Description

technical field [0001] The invention belongs to the technical fields of petroleum engineering and oil and gas field exploration, and in particular relates to a method for determining the quantitative classification of altered volcanic clastic glutenite reservoirs. Background technique [0002] In recent years, many sandy conglomerate reservoirs have been discovered in the Paleogene system in Bohai Oilfield, and tests have confirmed the commercial productivity of glutenite reservoirs, which is one of the important areas of oil and gas exploration. However, due to the influence of structural background, depositional environment and parent rock composition, the reservoir heterogeneity is strong. Especially for pyroclastic-rich glutenite reservoirs, under the influence of parent rock pyroclastic materials, glutenite reservoirs are altered to varying degrees, which further increases the difficulty of reservoir effectiveness evaluation. [0003] At present, the classification and...

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Problems solved by technology

[0004] The purpose of this invention is to provide a method for determining the quantitative classification of altered pyroclastic glutenite reservoirs, so as to solve the problem of evaluating the degree of alteration only by resistivity curves Determination of high and low resistivity curves for quantitative classification of altered pyroclastic glutenite reservoirs, a technical problem with uncertainty

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