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Acoustic Time-difference Discrimination Method for Complex Lithology Natural Gas Formation

A technology of sonic time difference and natural gas layer, which is applied in wellbore/well components, measurement, earth-moving drilling, etc., to improve the discrimination effect and have a good application prospect.

Inactive Publication Date: 2016-07-20
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention aims to solve the technical problem that the natural gas layer cannot be discriminated in the complex lithology stratum, especially the complex lithology clastic rock stratum existing in the above-mentioned prior art, and provides a complex lithology natural gas layer acoustic wave time difference discrimination method, The invention is especially suitable for use in the identification of natural gas layers such as clastic rocks, carbonate rocks, and igneous rocks, has good application prospects, and improves the identification effect of natural gas layers

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  • Acoustic Time-difference Discrimination Method for Complex Lithology Natural Gas Formation
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  • Acoustic Time-difference Discrimination Method for Complex Lithology Natural Gas Formation

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Embodiment 1

[0043] As the best implementation mode of the present invention, it uses formation lithology and mineral composition, porosity, water saturation and formation water resistivity factors to calculate a theoretical value curve of acoustic wave time difference, and compare the theoretical value curve of acoustic wave time difference obtained by calculation with the actual measured value. The gas layer can be identified according to the difference between the two acoustic time-difference curves.

[0044] The specific method of "calculating a theoretical value curve of acoustic time difference by using formation lithology mineral composition, porosity, water saturation and formation water resistivity factors" is as follows:

[0045] a. Experimentally determine rock-electricity parameters

[0046] The cored rock samples were subjected to rock electrical experiments under simulated formation conditions to obtain the rock cementation index m, water saturation index n and coefficients a...

Embodiment 2

[0068] As a verification example of the present invention, with reference to the accompanying drawings in the description:

[0069] figure 1 The cross plot of formation factors and porosity obtained from the results of lithoelectric experiments on clastic rock formations in a certain block. The lithoelectric experiments were carried out under the conditions of simulated formation temperature, formation pressure and formation water salinity, and the cementation index was obtained according to the experimental results. m=1.5 and a=1.2;

[0070] figure 2 It is the intersection graph of resistivity index and water saturation obtained from the rock electric experiment, and the saturation index n=2.9 and b=1.0 are obtained according to the experimental results;

[0071] image 3 The porosity-deep induction resistivity intersection diagram of the natural gas layer and the water layer in this block, and the water saturation SW=55% of the boundary line between the gas layer and the...

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Abstract

The invention discloses a complex lithology natural gas reservoir interval transit time discriminating method, and belongs to the technical field of acoustic logging information application. Formation lithology mineral composition, porosity, water saturation and formation water electrical resistivity factors are utilized to calculate an interval transit time theoretical value curve, the interval transit time theoretical value curve obtained through calculation is compared with an interval transit time curve measured actually, and a natural gas reservoir is discriminated according to the different features of the interval transit time theoretical value curve obtained through the calculation and the interval transit time curve measured actually. The complex lithology natural gas reservoir interval transit time discriminating method is especially suitable for being used in discrimination of natural gas reservoirs of clastic rock, carbonate rock, igneous rock and the like, good in application prospect and capable of improving discriminating effect of the natural gas reservoirs.

Description

technical field [0001] The invention relates to a method for discriminating natural gas layers, and belongs to the technical field of application of acoustic logging data. Background technique [0002] At present, the commonly used logging identification methods for natural gas layers include porosity overlapping method, acoustic-electric intersection method, nuclear magnetic logging detection method, resistivity absolute value and difference method, multi-parameter comprehensive discrimination method and many other methods. [0003] In the method of identifying natural gas layers from acoustic logging data, the intersection or overlap of compensated acoustic time difference and other logging data is generally used for identification. For example, the Chinese patent document with the publication number CN101787884A and the publication date of July 28, 2010 discloses a method for identifying reservoir fluid types based on the difference between acoustic porosity and neutron p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B49/00E21B47/14
Inventor 杨嘉罗利吴胜甘秀娥
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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