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Stratum division method based on multiple logging curves

A logging curve and stratum technology, applied in surveying, earthwork drilling, wellbore/well components, etc., can solve the problems of ambiguity of stratum boundary depth, strong human factors, incomplete response information, etc. Visible, fast-to-compute effects

Inactive Publication Date: 2021-01-12
JILIN UNIV
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Problems solved by technology

[0006] Disadvantages of this method: (1) Only the acoustic wave and density data in the logging curve are used, and the response information is not comprehensive; (2) After combining with seismic data, the resolution of the formation is not significantly improved, and the depth of the formation boundary is blurred. Some thin layers at the location may still be controversial; (3) The basis for stratigraphic division is not obvious
like image 3 As shown, there is obviously a relatively large waveform above T2K1, and the boundary of the formation is taken directly below this waveform, while the boundary of the T3b formation is taken directly above the waveform, which is self-contradictory. Therefore, the layering method is artificial. stronger

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  • Stratum division method based on multiple logging curves
  • Stratum division method based on multiple logging curves
  • Stratum division method based on multiple logging curves

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Embodiment 1

[0052] The overall process of the present invention is as figure 1 shown.

[0053] Implementation example of logging curve stratigraphic division in a certain block of Xinjiang Oilfield figure 2 shown.

[0054] The stratification in this well has been controversial. According to the division method of well-seismic combination, since the base value of the acoustic time difference (acoustic time difference corresponds to the thickest curve) has almost no change, the place where the shaking occurs is the mudstone section, and it is difficult to stratify the 3050m-3120m. There are mudstones between 3080 meters and the strata below 3080 meters are often divided into the same interval. Not only that, it is also difficult to distinguish the formation above 3050 meters through the acoustic time difference. For example, the acoustic time difference of the formation at 3010 meters to 3020 meters is almost the same as that of the formation below 3050 meters. divided into the same s...

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Abstract

The invention relates to a stratum division method based on multiple logging curves. The method adopts a difference value between neutron porosity and density porosity to represent shale content, builds correlation with natural gamma-ray logging data representing radioactivity intensity, and can divide a stratum through the difference of the correlation. According to the division method, various logging curves are comprehensively utilized, so that the accuracy is higher than that of a well-to-seismic combination mode; the shale content of the stratum with complex mother rock components can becalculated by comprehensively utilizing compensated neutron logging information and compensated density logging information; the method for dividing the stratum by utilizing the correlation differencebetween the radioactive intensity and the shale content between different stratum is provided, and the dispute of stratum division is eliminated; and the method is simple in related parameters, concise in using steps, rapid in calculation and obvious in effect.

Description

Technical field: [0001] The present invention relates to a kind of well logging data such as natural gamma ray logging data, compensated neutron porosity logging data and compensated density porosity logging data, etc., and the natural gamma ray logging data indicates that the shale content is inaccurate Moreover, the conventional well-seismic combination method is a method for accurately dividing strata that are controversial in stratum division. Background technique: [0002] Stratigraphic division refers to the division of rock strata in the stratigraphic section of an area and the establishment of stratigraphic sequences, which is a very important basic work for geological research. Generally, for the stratigraphic section of an area, the rock stratigraphy is firstly divided according to the lithology and lithofacies characteristics, and then the biostratigraphic division is carried out according to the systematically collected fossils, and then the chronostratigraphic s...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00E21B47/00G06F17/10
CPCE21B47/00E21B49/00G06F17/10
Inventor 齐兴华王祝文韩锐羿崔裔瞳
Owner JILIN UNIV