Porosity interpretation method and device based on acoustic wave propagation theory

Abstract

The embodiments of the invention provide a porosity interpretation method and device based on an acoustic wave propagation theory. A superposition principle of acoustic wave propagation time proposedby Willie is taken as the guidance, rock core porosity analysis data are taken as the basis, a method of combining theory and practice is adopted, through shale content calculation and the abnormal high-value processing of acoustic interval transit time, an acoustic wave porosity multi-factor correction model is established, a computer programming method is adopted to carry out work, the shale content is corrected point by point, the porosity is interpreted point by point, the porosity distribution condition on a sand body section is finely described, the heterogeneity of the sand body sectionis finely described, and the porosity interpretation precision is remarkably improved.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of porosity logging, and in particular to a porosity interpretation method and device based on the acoustic wave propagation theory. Background technique [0002] Porosity interpretation is an important task in reservoir research. At present, the sonic porosity linear interpretation model is widely used, but the interpretation error is relatively large. For example, Shi Xianda et al. (2017, complex oil and gas reservoirs) applied a linear model to interpret porosity, and Ma Qiang et al. (2015, foreign logging technology) introduced natural gamma amplitude difference to interpret porosity in acoustic porosity interpretation. Although Wang Xianggong and Mao Zhiqiang introduced the correction of shale content in the porosity interpretation, the scale of correction is relatively large, and the correction is carried out according to the interval range of shale content of 5%, 10%, and 15%...

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Problems solved by technology

It is undeniable that the theory of phase-controlled reservoirs does have a good control effect on the physical properties of reservoirs. Under the guidance of the theory of phase-controlled reservoirs, the interpretation accuracy of reservoir physical properties has been significantly improved; however, the target of the theory of phase-controlled reservoirs is Sand body level, cannot describe the heterogeneity inside the sand body finely

For example, in a sedimentary environment with turbulent hydrodynamic conditions, there are several interlayers inside the channel sand body, and the facies-controlled reservoir theory cannot describe the porosity and permeability changes of the reservoir inside the sand body finely.

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