Well logging method for rapidly determining organic porosity of shale gas reservoir

Abstract

The invention relates to a well logging method for rapidly determining the organic porosity of a shale gas reservoir. The well logging method comprises the steps that well logging lithologic density DEN data of the well shale gas reservoir are obtained, the well logging lithologic density difference coefficient R<den> of the well shale gas reservoir is calculated, the organic porosity scale conversion coefficient K of a work area shale gas reservoir is determined, the dimensionless effect is achieved; and the organic porosity POR<toc> of the well shale gas reservoir is calculated according tothe calculation model POR<toc> =K.R<den>, and the final calculation result is output. According to the well logging method for rapidly determining the organic porosity of the shale gas reservoir, according to relationship derivation between the data obtained by shale core test analysis, the organic porosity of the shale gas reservoir can be quickly determined on a site through site well logging application verification, and the well logging method is low in cost, easy and convenient to operate and relatively wide in application range; and the well logging method is applied to over eighty wells, the average errors does not exceed 10%, the work needs of site rapid evaluation of the shale gas reservoir can be met, and important reference can be provided for shale gas exploration selection areas and reserves evaluation.

Description

[0001] The application field of the invention is shale gas exploration and development, and in particular relates to a logging method for quickly determining the organic porosity of shale gas reservoirs. Background technique [0002] Under certain conditions, the organic matter in the formation shale evolves to form shale gas and organic pores, so that the organic-rich shale is converted into a high-quality shale gas reservoir, and then enriched to form a shale gas reservoir. The organic porosity of shale gas reservoirs is a key parameter to characterize the physical properties, gas-bearing properties, and gas production properties of shale gas reservoirs, and is crucial to the development and evaluation of shale gas reservoirs. [0003] For a long time, the determination of the organic porosity of shale gas reservoirs has mainly depended on the determination of core experiments by special equipment, which is costly and inefficient, and is not suitable for the current logging w...

AI Technical Summary

Problems solved by technology

This method can provide reliable data for the evaluation of shale gas reservoirs, but the calculation of Roa requires a lot of data, and the standardization of these data needs to be done well, so it is relatively difficult to apply in the logging field

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