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Calcareous sandstone identification method and device

A calcareous sandstone and identification method technology, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve problems such as difficult to accurately identify calcareous sandstone

Active Publication Date: 2020-02-04
PETROCHINA CO LTD +1
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The embodiment of the present invention provides a calcareous sandstone identification method and device to solve the problem that the existing methods are difficult to accurately identify calcareous sandstone

Method used

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  • Calcareous sandstone identification method and device
  • Calcareous sandstone identification method and device
  • Calcareous sandstone identification method and device

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Embodiment Construction

[0044] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0045] figure 1 It is a flowchart of a calcareous sandstone identification method provided by an embodiment of the present invention. Such as figure 1 As shown, the method includes:

[0046] S11: Perform sequential Gaussian simulation on the time-domain compressional wave impedance curve of the well point in the target layer in the study area to obtain the compressional wave impedance data.

[0047] S12: Convolute the longitudinal wave impedance data with the seismic wavelet to obtain synthetic seismic data.

[0048] S13: Calculate the correlation coefficient between the synthetic seismic data and the actual seismic data.

[0049] S14: Comparing the correlation coefficient with the first set value.

[0050] When the correlation co...

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Abstract

The invention discloses a calcareous sandstone identification method and device, and belongs to the technical field of geological exploration. The method comprises the steps of: performing sequentialGaussian simulation on a well point time-domain longitudinal-wave impedance curve of a target layer in a research area, so that longitudinal-wave impedance data is obtained; performing convolution onthe longitudinal-wave impedance data and seismic wavelet, so that synthetic seismic data is obtained; calculating a correlation coefficient between the synthetic seismic data and actual seismic data;when the correlation coefficient is less than a first set value, sequentially obtaining the longitudinal-wave impedance data and the synthetic seismic data again till the correlation coefficient is not less than the first set value; and, interpreting an area that the longitudinal-wave impedance in the longitudinal-wave impedance data is not less than a second set value as a calcareous sandstone area. The correlation coefficient can reflect the correlation degree between the synthetic seismic data and the actual seismic data; the greater the correlation degree is, the closer the synthetic seismic data gets to the actual seismic data; and the area that the longitudinal-wave impedance in the longitudinal-wave impedance data is not less than the second set value is interpreted as the calcareous sandstone area.

Description

technical field [0001] The invention relates to the technical field of seismic exploration, in particular to a calcareous sandstone identification method and device. Background technique [0002] Calcareous sandstone refers to tight sandstone containing calcareous cement. Calcareous sandstone is a widely occurring rock type in clastic reservoirs. [0003] The distribution of calcareous sandstone has a great influence on the distribution of remaining oil. In oilfield development, identifying calcareous sandstone and clarifying the distribution of calcareous sandstone are conducive to improving development efficiency and production. [0004] At present, the commonly used methods for identifying calcareous sandstones are well logging identification and interwell modeling identification. This method can identify calcareous sandstones well in areas close to the wells, but it cannot identify calcareous sandstones in areas far away from the wells. The accuracy is low, and the acc...

Claims

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Application Information

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IPC IPC(8): G01V1/50
CPCG01V1/50G01V2210/6169
Inventor 徐立恒黄勇李岩
Owner PETROCHINA CO LTD
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