Shale oil-gas economical and effective layer section evaluation method

A technology for shale oil and gas and effective layers, which is used in earth-moving drilling, wellbore/well components, etc., and can solve the problem of inability to select economical and effective intervals in shale oil and gas layers.

CN104453873AActive Publication Date: 2015-03-25PETROCHINA CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2015-03-25

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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.
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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...

Examples

Embodiment Construction

[0078] Invented evaluation methods for several existing shale oil and gas economically effective intervals:

[0079] 1) When identifying effective fracturing intervals in unconventional shale oil and gas reservoirs, the effective fracturing intervals are determined according to the rock brittleness index of the research interval, that is, according to the mineral composition of the research interval, the quartz, Calcite content multiplied by the sum of the elastic parameters of the corresponding minerals, divided by the sum of quartz, calcite, clay content multiplied by the elastic parameters of the corresponding minerals.

[0080] 2) When studying the identification of effective reservoirs in shale reservoirs, according to the organic carbon content, rock brittleness index and formation pressure coefficient of the research interval, by formulating the discrimination standard and the weight coefficient of each parameter, the organic carbon content, rock brittleness Index, form...