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A method for rapid evaluation of oil and water layers using array sensing data

An array sensing, oil and water layer technology, applied in earth-moving drilling, surveying, wellbore/well components, etc., can solve problems such as difficulty in logging interpretation in complex geological blocks, inability to quickly evaluate oil and water layers, and achieve simple calculation. Effect

Active Publication Date: 2016-09-07
PETROCHINA CO LTD
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Problems solved by technology

Rapid evaluation of oil and water layers cannot be achieved in low-resistivity oil layers and new exploration areas, and logging interpretation in complex geological blocks is difficult

Method used

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  • A method for rapid evaluation of oil and water layers using array sensing data
  • A method for rapid evaluation of oil and water layers using array sensing data
  • A method for rapid evaluation of oil and water layers using array sensing data

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Embodiment 1

[0039] Example 1: In the new exploration area, there are no relevant empirical parameters, which will have a certain impact on the calculation accuracy of water saturation. In complex reservoir development areas, the factors affecting resistivity are complex and diverse, including low porosity caused by diagenesis, and fine The influence of lithology, heavy shale content, and the influence caused by mud intrusion are also included. These factors all cause changes in reservoir resistivity, and thus the identification accuracy of oil and gas layers. Therefore, how to eliminate these influences and further improve the calculation accuracy of water saturation cannot be achieved by existing methods.

[0040] The implementation of the present invention comprehensively considers various factors, and gradually strips the main influencing factors from the various factors until the relevant influencing factors are eliminated.

[0041] A method for rapidly evaluating oil and water layer...

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Abstract

The invention discloses a method for rapidly evaluating an oil-water layer through array induction data, and belongs to the technical field of logging evaluation in oil exploration. The method comprises the steps of collecting single well array induction logging data, namely carrying out array induction logging, analyzing the array induction data, selecting a curve which reflects the undistributed stratum electrical resistivity and the flushed zone stratum electrical resistivity, evaluating stratum water characteristics on the whole well section through the provided method according to the selected curve, segmenting the processed well section according to the calculated stratum water characteristic values, determining the stratum water characteristic values of each section, evaluating the water saturation of a whole-well-section reservoir stratum through a formula according to the selected stratum water characteristic values of each well section, calculating and obtaining the water saturation value of each storage stratum single layer or each point, evaluating the oil-water layer with an evaluation standard according to the water saturation values of each layer of the storage stratum, and therefore achieving rapid recognition on the oil-water layer.

Description

technical field [0001] The invention relates to a method for rapidly evaluating an oil-water layer by using array sensing data, and belongs to the technical field of logging evaluation in petroleum exploration. Background technique [0002] At present, Archie's formula and its related change formulas in petroleum logging are commonly used calculation techniques for evaluating reservoir water content. Archie's formula is: Sw=(a×b×Rw / Rt×Φ m ) 1 / n , where: Sw—reservoir water saturation, decimal; Rt—deep detection resistivity, Ω m; Φ—porosity, decimal; Rw—formation water resistivity, Ω m; a, b—lithology coefficient ; m—porosity index; n—saturation index. Archie's formulas can calculate reservoir water saturation, but they require parameters such as porosity, lithoelectric parameters, and formation water resistivity, and can only be processed with the same empirical parameters in one area. However, the actual parameters of individual wells may be different. Therefore, as a key...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B49/00E21B47/00
Inventor 杨克兵周明顺刘欢赵艳红钱铮
Owner PETROCHINA CO LTD
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