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Method for determining air layer using acoustic wave split-double pole transverse wave well-logging data

A logging data and dipole technology, applied in low-resistivity gas layers, low permeability, and low-porosity fields, can solve problems such as high requirements for reservoir physical properties, limited application range, and no obvious effect, and achieve enhanced geological solutions Ability to problem, effect of improving ability

Active Publication Date: 2008-10-29
BC P INC CHINA NAT PETROLEUM CORP +1
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AI Technical Summary

Problems solved by technology

NMR logging has high requirements on reservoir physical properties, which limits its application range
Logging acquisition technologies such as full wave train and dipole shear wave have provided rich information, but they have not really explored the effective information behind these data. Therefore, the full wave train, Dipole shear wave basic logging data has not achieved obvious results

Method used

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  • Method for determining air layer using acoustic wave split-double pole transverse wave well-logging data
  • Method for determining air layer using acoustic wave split-double pole transverse wave well-logging data
  • Method for determining air layer using acoustic wave split-double pole transverse wave well-logging data

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Embodiment Construction

[0020] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0021] 1. Calculating the time difference of compressional and shear waves under different saturations through gas-bearing reservoir cores

[0022] Firstly, the gas-bearing reservoir cores in the study area were selected for petrophysical property experiments. Carry out basic pretreatments such as washing oil and salt on the core, and measure basic parameters such as porosity and permeability. However, pressurize and saturate the core for displacement experiments under gas-water two-phase conditions. According to the industry standard "SY / T 6351-1998 Laboratory Determination Method for Acoustic Characteristics of Rocks", the velocity of compressional and transverse waves ( The reciprocal of the speed is the time difference).

[0023] The formula for calculating the velocity of longitudinal and shear waves is:

[0024] ...

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Abstract

A method of utilizing full wave column and dipolar lateral wave well-logging data to confirm gas layer includes setting up lateral-longitudinal wave conversion cross map of various gas saturation degree at gas reservoir in exploration area according to known rock physical character, utilizing acoustic wave data lateral wave time difference to confirm longitudinal wave time difference at various gas saturation degree, measuring longitudinal wave time difference and using various gas saturation degrees in said cross map to confirm gas situation in reservoir.

Description

technical field [0001] The invention relates to a method for determining low-porosity, low-permeability and low-resistance gas layers by using transverse and longitudinal wave time-difference logging data in the exploration and development of clastic rock conventional and unconventional gas reservoirs. technical background [0002] With the deepening of gas field exploration and development, the problem of determining difficult gas layers in clastic rocks has become more and more serious, and the focus is on the determination and identification of gas layers with low porosity, low permeability and low resistance. The basic method of logging to identify gas layers is based on the changes in electrical and radioactive characteristics of gas-bearing reservoirs. Conventional typical gas-bearing reservoirs show logging characteristics such as increased resistivity, increased acoustic transit time, decreased neutron porosity and increased density porosity, and the combination of n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/40G01V1/48G01V1/50
Inventor 令狐松王敬农王黎胡学红罗艳颖李新王长江
Owner BC P INC CHINA NAT PETROLEUM CORP
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