Shale reservoir brittle mineral logging quantitative characterization method

Abstract

The invention discloses a shale reservoir brittle mineral logging quantitative characterization method. The method comprises the following steps: 1, in the same shale oil and gas exploration and development area, selecting coring wells to constitute a sample collection and observation point, and collecting a shale sample; 2, testing the contents of quartz, feldspar and carbonate minerals in the sample respectively, and analyzing to acquire mineral content indexes; 3, acquiring mineral index data for reflecting shale reservoir brittleness; 4, analyzing according to a sample result to obtain index data for reflecting shale brittle mineral features and the environment, and screening typical parameter quantitative indexes of characterizing shale brittle mineral and typical electric property indexes; 5, distinguishing and evaluating shale reservoir brittleness to obtain the shale reservoir brittleness and a flat distribution feature. The method has the characteristics that predict accuracy and exploration and development success rate of a block shale brittle reservoir are improved and the exploration and development cost is low; the method can be widely applied to the fields of exploration evaluation and development design of oil and gas in shale reservoirs.

Description

technical field [0001] The invention relates to the fields of oil and gas exploration evaluation and development design of shale reservoirs, in particular to a quantitative characterization method for brittle mineral logging of shale reservoirs. Background technique [0002] Shale is a kind of clastic sedimentary rock. It is a rock formed by clastics through long and complicated deposition and diagenesis. It mainly contains silicon, calcium, clay and iron oxide. The rock is composed of clastics and interstitials. constitute. In addition to quartz and feldspar, clasts also include muscovite, heavy minerals, and rock debris. The interstitial material includes two components of cement and debris matrix. Common cements are siliceous and carbonate cements. The matrix component mainly refers to the finer clay or silty matter deposited simultaneously with clastics. A shale reservoir is a rock formation that can store and infiltrate fluids, that is, a reservoir, a rock formation...

AI Technical Summary

Problems solved by technology

Current research methods cannot study the type and content of brittle minerals in non-coring shale reservoirs vertically, and cannot effectively predict the plane distribution of brittle mineral types and content in shale reservoirs, which is not conducive to shale oil and gas exploration and the program design and operation of the evaluation process

[0005] Therefore, the present invention aims at the problems of low prediction accuracy, low exploration and development success rate and high exploration and development cost of shale brittle reservoirs in favorable blocks existing in existing methods, and provides a shale reservoir brittle mineral logging quantitative Characterization method

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