Multi-scale information integration tight formation brittleness index measuring method

Abstract

The invention discloses a multi-scale information integration tight formation brittleness index measuring method. The connotation of a brittleness index is clear based on rock mechanic and acoustic analysis, and the brittleness index is redefined and a brittleness index calculation model based on acoustic logging data is established; on the basis, rock composition and mineral content are obtained in combination with X ray diffraction experiments; the brittle mineral type of a researched target region is obtained based on single factor analysis and a new brittleness index calculation formula is established. Through the analysis, a formation composition profile is obtained by processing routine logging data so as to achieve refined modeling and continuous processing of the brittleness index. According to the measuring method disclosed by the invention, the brittleness index measurement can be achieved in wells in shortage of special logging data such as array acoustic wave so as to avoid measurement errors caused by transverse wave prediction and the like, exploration cost can be saved and the explanation precision can be improved; therefore, the measuring method has significance on fracturing transformation and sweet point searching in a tight formation.

Description

technical field [0001] The invention belongs to the field of unconventional oil and gas exploration and development, in particular to a method for calculating the brittleness index of tight formations based on rock physics, geochemistry, mineralogy and logging data. Background technique [0002] Brittleness is an important parameter in formation drillability analysis, fracturing layer selection, sweet spot prediction and operation parameter optimization, and is an important content in the evaluation of the "seven properties" of tight oil and gas reservoirs, which has attracted more and more attention from academia and industry. Scholars at home and abroad have done a lot of research work on rock brittleness and made some progress, but there are still big differences in the precise definition and calculation methods of rock brittleness. Different definitions and methods make geologists lack an overall grasp of rock brittleness, and mechanically applying related models in appl...

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Problems solved by technology

The application of rock mineral content and acoustic parameters to calculate the brittleness index is widely used in the industry, but its applicable conditions, as well as the calibration and comparison of these parameters, are rarely studied at home and abroad

In this way, the brittleness index calculation models are varied, and the calculation results are also very different, making it difficult to truly describe the real brittleness information of tight formations

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