Sequence stratigraphic division method

A sequence stratigraphy and normalization technology, applied in the field of seismic data interpretation of seismic exploration, can solve the problem of low precision

Active Publication Date: 2022-03-04
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for sequence stratigraphy division, which is used to solve the problem that the accuracy of sequence division is low in the existing combined logging and seismic data method

Method used

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Examples

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Embodiment Construction

[0039] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0040] This example proposes a sequence stratigraphy division method, the overall process is as follows figure 1 As shown, the following takes a sag in the Yin'e Basin as an example to introduce the implementation steps of this method in detail:

[0041] Step 1, data preparation of seismic data and well logging data, specifically:

[0042] For seismic data, the 3D post-stack seismic data volume of a certain sag in the Yin’e Basin is collected. The sampling rate (i.e. sampling interval) of the data volume is ΔT=2ms, and its frequency is Unit Hz, such as figure 2 shown.

[0043] Perform Fourier transform on the 3D post-stack seismic data volume collected above to obtain the spectral characteristic curve of the data volume, such as image 3 As shown, the frequency band range of the data body is obtained from the curve [f 1 , f 2 ] and m...

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Abstract

The invention relates to a sequence stratigraphic division method, which belongs to the field of seismic exploration seismic data interpretation, and realizes deep fusion of seismic information and logging information, that is, forward modeling is carried out by using a reconstructed wave impedance curve to obtain a seismic synthesis record, and after the seismic synthesis record and well-crossing seismic data are reconstructed, the seismic synthesis record and the well-crossing seismic data are subjected to forward modeling. And a final time-frequency spectrum is obtained through generalized S transformation, sequence stratigraphic division can be performed by using the time-frequency spectrum, the division precision is high, and the time-frequency spectrum can be divided to the fifth level. The sequence stratigraphic division method is high in practicability and can be popularized and applied in the continental lake basin sedimentary environment.

Description

technical field [0001] The invention belongs to the field of seismic data interpretation of seismic exploration, and in particular relates to a sequence stratigraphic division method. Background technique [0002] In recent years, with the deepening of exploration and development of subtle oil and gas reservoirs, sequence stratigraphy has been widely used. The key to sequence stratigraphy analysis is to divide stratigraphic sequence boundaries of different levels and the sedimentary cycles inside them. In actual production, outcrop, core, well logging and other data are generally used to identify stratigraphic sequence boundaries. Among them, the most widely used is the use of drilling and logging data for sequence stratigraphy research, because: drilling and logging data The well data is one of the geological data with the best continuity and the highest resolution at present. Using the lithoelectric change characteristics of well logging curves and coring characteristics,...

Claims

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Application Information

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IPC IPC(8): G01V1/30G01V1/28G01V1/36
CPCG01V1/30G01V1/306G01V1/282G01V1/364G01V2210/21G01V2210/6169G01V2210/6161G01V2210/6226Y02A90/30
Inventor 苏云唐娟孟凡冰郝加良张慧严移胜侯斌张欣
Owner CHINA PETROLEUM & CHEM CORP
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