Morphological filtering-based electrical imaging reservoir fracture and cave body quantitative characterization method and system

A technology based on morphological and quantitative characterization, which is applied in radio wave measurement system, electric/magnetic detection for well logging, re-radiation of sound wave, etc., can solve problems such as application effect limitation, achieve fast calculation speed, High efficiency and simple calculation effect
CN106443802AActive Publication Date: 2017-02-22CHINA PETROLEUM & CHEM CORP +4
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Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
CHINA PETROLEUM & CHEM CORP
Publication Date
2017-02-22

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Abstract

The present invention discloses a morphological filtering-based electrical imaging reservoir fracture and cave body quantitative characterization method and system. The method includes the following steps that: 1) noise suppression and blank band encryption interpolation are performed on original electric imaging logging data to obtain full-coverage rate electrical imaging logging data; 2) structural elements of appropriate shapes and scales are selected, and morphological filtering is performed on the obtained electrical imaging logging data in the step 1), so that fracture and cave pore distribution of different scales can be determined; and 3) the proportion of the porosity of fractures and the proportion of the porosity of corroded caves are calculated according to the fracture and cave pore distribution of different scales, so that a fracture and cave porosity spectrum which can indicate pore throat size and porosity distribution relationships can be obtained. According to the method of the invention, a mathematical morphological filtering method is introduced into imaging logging data processing; based on the filtering and anomaly recognition technologies of conductivity signals of different scales, the signal-to-noise ratio and identifiability of fracture and cave abnormal signals are improved; and exact information such as intuitive fracture and cave shapes and scale distribution can be provided for the processing and interpretation of electrical imaging logging data.
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Description

technical field

[0001] The invention belongs to the technical field of petroleum well logging, and in particular relates to a quantitative characterization method and system for electrical imaging reservoir fracture-cave bodies based on morphological filtering. Background technique

[0002] Electrical imaging logging (taking Schlumberegr's FMI as an example) adopts the shielding principle of lateral logging. During the logging process, 8 plates are pressed against the well wall by means of a hydraulic system. Each plate and plate The 24 small button electrodes emit currents of the same polarity to the formation, and the metal shell on the upper part of the instrument is used as a return electrode. Due to the constant point position on the pole plate, the current emitted from the pole plate plays a role in focusing the current of the small button electrode. The multi-row button-shaped small electrodes on the 8 pole plates are used to transmit current to the wellbore formation...

Claims

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