Method and device for predicting recoverable reserves of tight oil areas to be evaluated

Abstract

The embodiment of the invention provides a method and device for predicting the recoverable reserve of tight oil in a to-be-valuated region. According to the method provided by the embodiment of the invention, the single-well recoverable reserve of the tight oil is reasonably predicted by utilizing production situations of producing wells already put into operation in the adjacent regions of the to-be-valuated region and by combining with the change of geological factors simultaneously and main controlling factors of the to-be-valuated region are optimally selected by utilizing correlation analysis to ensure that the inapplicability problem of using same geological parameters to predict the single-well EUR (Estimated Ultimate Recovery) of the tight oil in previous geological prediction models is avoided; moreover, the coefficients of the geological parameters in the EUR prediction models are confirmed by utilizing a multiple regression method to ensure that the defect of large error of artificially and subjectively confirming the similarity coefficient is overcome; and therefore, the method has the advantages that the evaluation result is more accurate and more reliable and basis is provided for the later economic evaluation of the tight oil block.

Description

technical field [0001] The present application relates to the technical field of tight oil development, in particular to a method and device for predicting the recoverable reserves of tight oil areas to be evaluated. Background technique [0002] The potential of tight oil resources is huge, and it is still in the early stage of exploration, which will be an important growth point of future oil production. At present, the evaluation system of recoverable reserves of tight oil is still based on conventional oil and gas evaluation. At present, the main techniques involved in the evaluation of tight oil reserves include: volumetric method, probability statistics method, analogy method, well spacing extrapolation method, production decline method, etc. in: [0003] ① Volumetric method, based on well logging and seismic data to describe the spatial distribution of underground tight oil in the area to be evaluated, calculate the volume of tight oil layers, and estimate tight oil...

AI Technical Summary

Problems solved by technology

However, in the exploration process of new tight oil blocks, there is no development well and production history data, so this method can only be applied to the evaluation of developed tight oil blocks, and cannot predict tight oil blocks in the exploration stage

[0013] In summary, due to the significant differences between tight oil resources and conventional oil and gas resources in terms of geological conditions and development methods, it is difficult to obtain more accurate tight oil reserves with existing technical solutions.

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