Rock sample porosity determination method

Abstract

The invention provides a rock sample porosity determination method, and belongs to the oil-gas geology exploration and development field. The method comprises the following steps: determining and calculating to obtain the entity volume of a rock sample, covering the external surface of the rock sample with a film, determining and calculating to obtain the volume of the film covered rock sample, peeling the film from the rock sample, determining and calculating to obtain the volume of the film, calculating to obtain a difference between the volume of the film covered rock sample and the volume of the film in order to obtain the bulk volume of the rock sample, calculating to obtain a difference between the bulk volume of the rock sample and the entity volume of the rock sample in order to obtain the pore volume of the rock sample, and finally calculating to obtain the ratio of the pore volume of the rock sample to the bulk volume of the rock sample in order to obtain the porosity of the rock sample. The rock sample porosity determination method has the advantages of simplification of present rock sample porosity determination methods, analytic period shortening, work efficiency improvement, applied apparatus reduction, analytic precision improvement, and cost reduction.

Description

technical field [0001] The invention belongs to the field of oil and gas geological exploration and development, and in particular relates to a rock sample porosity measurement method. Background technique [0002] To measure the porosity of a rock sample, it is necessary to obtain (measure or calculate) two parameters in the total volume of the rock sample, the solid volume of the rock sample, and the pore volume. At present, according to their working methods, they can be roughly divided into the following three methods: [0003] Gas-liquid method: The buoyancy method is used to determine the total volume of the existing rock sample. On the basis of drying the rock sample, soak the rock sample to be tested in water (or kerosene). In the weight, and determine the specific gravity of water (or kerosene). Take the rock sample out of water (or kerosene), wipe off the water (or kerosene) on the surface of the rock sample, weigh the weight of the rock sample in the air after ...

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Problems solved by technology

It can be seen that there are many operating links, many application equipment, and cumbersome operating procedures.

[0011] (3) As far as the gas method is concerned, in the total volume measurement method proposed by Huang Futang et al., there is a risk that the rubber bushing in the core holder has a dead angle and cannot be attached t

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