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A method and device for identifying gas layers using longitudinal waves and Stoneley waves

A technology of longitudinal waves and gas layers, applied in earthwork drilling, measurement, boreholes/well components, etc., can solve the problems of lost gas layers, low sensitivity, and different attenuation, so as to reduce manpower and material resources and improve gas production efficiency , The effect of reducing the number of gas testing operations

Active Publication Date: 2021-03-16
北京吉奥特能源科技有限责任公司
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Problems solved by technology

However, complex phenomena such as simultaneous attenuation of longitudinal waves and Stoneley waves, separate attenuation, and different attenuation sizes may occur in natural gas layers, resulting in low sensitivity of existing methods and possible gas layer leakage

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  • A method and device for identifying gas layers using longitudinal waves and Stoneley waves
  • A method and device for identifying gas layers using longitudinal waves and Stoneley waves
  • A method and device for identifying gas layers using longitudinal waves and Stoneley waves

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Embodiment Construction

[0041] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the protection of the present invention. scope.

[0042] Such as figure 1 As shown, the embodiment of the present invention provides a method for identifying gas layers using longitudinal waves and Stoneley waves, and the method may include the following steps:

[0043] Step 1: Analyze the velocity of the array acoustic wave data to obtain the filtered longitudinal wave waveform and Stoneley wave wave...

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Abstract

The invention discloses a method and device for recognizing a gas layer by using a longitudinal wave and a stoneley wave. The method comprises the steps of S1: acquiring a longitudinal wave waveform and a stoneley wave waveform after wave filtering, a head wave arrival time curve of the longitudinal wave, and a head wave arrival time curve of the stoneley wave; S2: respectively conducting Fouriertransformation to the longitudinal wave and the stoneley wave; S3: acquiring amplitudes in a preset time window length of the longitudinal wave and the stoneley wave; S4: transforming the amplitude ofthe longitudinal wave into a longitudinal wave energy, and transforming the amplitude of the stoneley wave into a stoneley wave energy; S5: acquiring a recognition curve of the gas layer according tothe longitudinal wave energy and the stoneley wave energy. According to the method, by using the longitudinal wave energy of an array acoustic wave and the stoneley wave energy, an indicative curve of stratum gas content is calculated, response characteristics of natural gas to the longitudinal wave attenuation and the stoneley wave attenuation are amplified, the influence of only the longitudinal wave attenuation response or the stoneley wave attenuation response in some gas layers is eliminated, sensitivity can be effectively improved, and the position of a gas-bearing stratum is accuratelyjudged.

Description

technical field [0001] The invention relates to the technical field of geophysical well logging, in particular to a method and a device for identifying gas layers by using longitudinal waves and Stoneley waves. Background technique [0002] In formations such as dolomite and limestone, due to the high resistivity of the rock skeleton, the background value of the conventional resistivity curve obtained from well logging is relatively high. At this time, if the formation contains natural gas, the conventional resistivity curve is often difficult to reflect the Changes in natural gas content; in addition, because dolomite and limestone reservoirs generally have complex pore structures, the excavation effect of neutron logging and the cycle jumping phenomenon of acoustic logging curves in gas-bearing formations are not obvious. Conventional logging identification of high-resistivity gas layers is difficult. [0003] In the prior art, since array acoustic logging may attenuate t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B47/14E21B49/00
CPCE21B47/14E21B49/00
Inventor 龙耀萍包亮何志昂任威龙
Owner 北京吉奥特能源科技有限责任公司
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