Formation interface real-time extraction method based on while-drilling azimuth electromagnetic wave logging data

A technology for logging data and formation interface, which is used in electrical digital data processing, special data processing applications, instruments, etc.

Active Publication Date: 2018-12-07
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

[0003] So far, the dual-interface inversion model has been widely used in the processing of azimuth electromagnetic wave data while drilling, but there are still many problems in the inversion speed of the dual-interface inversion stratigraphic model and the inversion accuracy in thin layers

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  • Formation interface real-time extraction method based on while-drilling azimuth electromagnetic wave logging data
  • Formation interface real-time extraction method based on while-drilling azimuth electromagnetic wave logging data
  • Formation interface real-time extraction method based on while-drilling azimuth electromagnetic wave logging data

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Embodiment Construction

[0059] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0060] combine figure 1 As shown, the real-time extraction method of formation interface based on azimuth electromagnetic wave logging data while drilling includes the following steps:

[0061] s1. Obtain the logging data of pilot wells, including resistivity and geological signal logging data.

[0062] s2. Extract formation resistivity and lithology sequences based on pilot well logging data, such as layer thickness, resistivity and formation lithology.

[0063] s3. Sliding window processing is performed on the actual logging data of highly deviated wells / horizontal wells, and the initial complex formation model is transformed into a series of one-dimensional layered formation models after windowing.

[0064] Through the above design, it is beneficial to simplify the three-dimensional inversion problem into a series of one-dimensional inversi...

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Abstract

The invention discloses a formation interface real-time extraction method based on while-drilling azimuth electromagnetic wave logging data. The formation interface real-time extraction method comprises the steps that s1, sliding windowing is conducted on the logging data of a large-slope well / a horizontal well; s2, if shallow detection geological signals exist, the s3 is executed, and otherwise the s5 is executed; s3, single-interface inversion is conducted through the shallow detection geological signals; s4, the optimal solution of the single-interface inversion is input into the s7 to be used as known constraint; s5, a dual-interface inversion model is established; s6, whether proximity interface information exists or not is judged, if yes, the s7 is executed, and otherwise the s8 is executed; s7, multi-initial-value selection is conducted on far formation interface positions and far surrounding rock resistivity in the model in the s5, and then the s9 is executed; s8, multi-initial-value assignment is conducted on all to-be-inverted parameters in the model in the s7; s9, on the basis of deep detection geological signals, the optimal solution of double-interface inversion is obtained; and s10, real-time imaging processing is conducted on inversion results. According to the formation interface real-time extraction method, fast and accurate interface information can be provided for real-time geological guidance.

Description

technical field [0001] The invention relates to the technical field of petroleum exploration and development, belongs to the category of electric well logging methods, and in particular relates to a real-time extraction method of formation interface based on azimuth electromagnetic wave logging data while drilling. Background technique [0002] During the drilling of deviated wells / horizontal wells, the real-time determination of the distance and orientation of the formation interface is one of the key issues to be solved in geosteering while drilling. transformation is of great significance. Using the azimuth electromagnetic logging tool while drilling, combined with the typical response characteristics of the tool, the position information of the formation interface can be qualitatively judged. However, due to the influence of the downhole formation environment, the response of the azimuth electromagnetic logging is extremely complex, and the inversion speed of the traditi...

Claims

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Application Information

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IPC IPC(8): E21B47/13G06F17/50
CPCG06F30/20E21B47/13
Inventor 王磊范宜仁吴易智操应长邢涛
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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