Lithofacies identification method and device for alluvial fan glutenite reservoir

Abstract

The embodiments of the present application provide a lithofacies identification method and device for glutenite reservoirs of diluvial fans. The method includes: determining the sedimentary characteristics of the fan top of the diluvial fan; Lithofacies; according to the core well data in the top of the diluvial fan, the lithofacies sample data is formed; a part of the lithofacies sample data is used to train the samples, and the lithofacies identification model of different lithofacies in the sedimentary microfacies is constructed by using the Bayesian discriminant method; The facies identification model includes the corresponding relationship between specific reservoir parameters and lithofacies; based on the remaining lithofacies sample data, verify whether the lithofacies identification model meets the preset requirements; when the lithofacies identification model meets the preset requirements, obtain Specific reservoir parameter values ​​of the rock in the target layer are substituted into the lithofacies identification model to obtain the lithofacies type of the rock in the target layer. The embodiment of the present application can improve the lithofacies identification accuracy and identification efficiency of the diluvial fan glutenite reservoir, and provide a basis for fine evaluation of the diluvial fan top glutenite reservoir.

Description

technical field [0001] The present application relates to the technical field of oil and gas exploration and development, in particular to a lithofacies identification method and device for diluvial fan glutenite reservoirs. Background technique [0002] Alluvial fans are alluvial fans caused by seasonal rainstorms in arid or semi-arid climates. The flood carried a large amount of debris gushing out of the mountain pass. Due to the slowing down of the slope, the reduction of the flow velocity and the dispersion of the water flow, coupled with evaporation or downward infiltration, the debris material accumulated rapidly, and the sediment was mainly sandy conglomerate supported by gravel. Extremely poor, low roundness, mainly sub-round to sub-angular, complex composition, high impurity content, it is a special type of glutenite reservoir formed in the near-source high-energy environment. [0003] At present, the research on alluvial fans is mainly based on the analysis and di...

AI Technical Summary

Problems solved by technology

However, due to the extremely strong heterogeneity of this type of reservoir, the relationship between sedimentary microfacies and reservoir quality of this type of reservoir is not yet clear. The same type of sedimentary microfacies, the distribution of different lithofacies is uneven, and the reservoir quality often The difference is very large. The traditional sedimentary microfacies research scale is difficult to meet the needs of sandy conglomerate reservoir evaluation. At present, there is an urgent need for a technical solution to accurately identify the spatial distribution of alluvial fan glutenite reservoirs.

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