Shale oil-gas economical and effective layer section evaluation method

Abstract

The invention provides a shale oil-gas economical and effective layer section evaluation method. The method comprises the steps of determining evaluation parameters of shale of target layer sections according to obtained logging data and core data, wherein the evaluation parameters include the organic carbon content, the porosity, the formation pressure coefficient, the oil-gas accumulative output impact factor and elastic parameters; subtracting a corresponding cut-off value from each evaluation parameter to obtain a difference value of each evaluation parameter; using points with the difference values, larger than 0, of the evaluation parameters as efficient points; adding the thicknesses of logging points which are continuous efficient points in the target layer sections, and using the added result as the single-layer thickness of the continuous efficient points; determining the shale oil-gas accumulated economical yield minimum thickness; using the layer section with the single-layer thickness of the continuous efficient points larger than or equal to the accumulated economical yield minimum thickness in the target layer section as the shale oil-gas economical and effective layer section. According to the shale oil-gas economical and effective layer section evaluation method, the shale oil-gas economical and effective layer section can be accurately and effectively determined, and therefore the shale oil-gas development benefits are improved.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploration and development, in particular to an evaluation method for economically effective intervals of shale oil and gas. Background technique [0002] With the development of oil and gas exploration and development from conventional oil and gas reservoirs to unconventional oil and gas reservoirs, shale oil and gas has gradually become an important field of oil and gas exploration and development. In recent years, with the successful commercial development of shale oil and gas, shale oil and gas has gradually become a realistic field of oil and gas exploration. During the exploration and development of shale oil and gas, not all shale The rock oil and gas development intervals can be developed economically and effectively. [0003] At present, the research on shale oil and gas mainly focuses on geological characteristics, genetic mechanism, evaluation of planar core area and fracturing te...

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Problems solved by technology

[0004] An embodiment of the present invention provides a method for evaluating economically effective intervals of shale oil and gas to solve the technical problem in the prior art that economically effective intervals cannot be selected in shale oil and gas layers. The method includes:

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