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Application of the Wavelet Transform and INPEFA in Sequence Stratigraphy.

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  • 1College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China.

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Summary

Accurate sand body prediction in the Ordos Basin

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Area of Science:

  • Petroleum geology
  • Sequence stratigraphy
  • Sedimentary basin analysis

Background:

  • The Shan 2 Member (S2) strata in the Ordos Basin hinder accurate sand body distribution studies.
  • Inaccurate sand body prediction impacts oil and gas exploration and development.

Purpose of the Study:

  • To improve sand body prediction accuracy by refining stratigraphic division.
  • To accurately characterize the transverse distribution of sand bodies within the S2 Member.

Main Methods:

  • Sequence stratigraphy was applied to divide the S2 Member.
  • Seismic, logging, and core data were integrated.
  • Logging curves were processed using INPEFA and wavelet transform.
  • Maximum entropy spectral analysis and wavelet transform were used for fine-scale division.

Main Results:

  • The S2 Member was divided into 1 long-term, 6 medium-term, and 11 short-term base-level cycles.
  • Fine stratigraphic division enhanced the accuracy of sand body prediction.
  • Seismic interpretation surfaces limited the S2 section range.

Conclusions:

  • Refined stratigraphic division using sequence stratigraphy significantly improves oil and gas reservoir exploration accuracy.
  • Integrated data analysis and advanced signal processing techniques are crucial for precise geological characterization.