Method for analyzing cycle strata based on lithology midpoint sinusoidal interpolation model

An interpolation model and lithology technology, applied in the field of sedimentary stratigraphy, can solve problems such as multi-interference peak spectrum, increase the difficulty of identifying target astronomical signals in the formation, achieve the effect of solving a large number of interference signals and improving the simulation matching effect

Active Publication Date: 2021-06-29
LANZHOU UNIVERSITY
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Problems solved by technology

The existing lithological cycle analysis method is based on the collection of rectangular wave sequences, and then conducts research methods such as spectrum analysis, dynamic Fourier analysis, and astronomical tuning analysis, so as to establish an astronomical time scale and accurately calibrate the time of the earth's evolution history However, there are two problems in the existing boundary models of lithological cycles: 1. In the process of spectrum analysis, the rectangular wave sequence will generate more interference peaks in the frequency domain, which greatly increases the ability to identify target astronomical signals in the formation. Second, the paleoenvironment and paleoclimate changes in the sedimentary period are continuous wave-like change patterns, and the existing flat-abrupt rectangular wave sequences cannot better simulate the fluctuation characteristics of the original sedimentary signal over time

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  • Method for analyzing cycle strata based on lithology midpoint sinusoidal interpolation model
  • Method for analyzing cycle strata based on lithology midpoint sinusoidal interpolation model
  • Method for analyzing cycle strata based on lithology midpoint sinusoidal interpolation model

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Embodiment 1

[0026] A 1300cm-thick siliceous-shale cycle formation that has been confirmed to contain astronomical signals of slope and precession period was selected, and the SiO 2 The siliceous rock unit with higher content is assigned a value of 1, and the SiO 2 The mudstone unit with low content is assigned a value of -1, and the bottom layer of the cycle strata is taken as the initial horizon, and the middle points of 11 lithological units are selected upwards in turn, and the distance from each middle point to the initial horizon is used as the distance from each middle point to the initial horizon. X coordinate, assign the value of the lithological unit where the middle point is located as the Y coordinate of each middle point, and establish the coordinate points (5.1, 1), (14.1, -1), (22, 1), (30.5, -1) of each middle point ), (40.6, 1), (47, -1), (49, 1), (55.2, -1), (63, 1), (67.2, -1), (76.3, 1); Uniform and uniform interpolation between coordinate points, such as coordinate po...

Embodiment 2

[0031] Select a synthetic slope-precession theoretical model sequence that contains slope and precession period astronomical signals. The theoretical model sequence contains two columns of XY data. The X value of the first column of data is the time from 0 to 3000kyr at an interval of 1kyr. The Y value of the second column of data is the slope-precession change value per 1kyr. The slope-precession value is in Fluctuation changes between -4 and 5; the theoretical model sequence sequence is converted into a ternary cycle sequence, and the steps include: the second column of data Y≤0 is assigned a value of 1, 0f (t)=Acosωt Gradually increase, (Xn, 2), (Xn+0.1, 2+(cos(π*0.1 / 0.1 / N+π)+1) / 2), (Xn+0.2, 2+(cos(π*0.2 / 0.1 / N+π)+1) / 2), (Xn+0.3,2+(cos(π*0.3 / 0.1 / N+π)+1) / 2), ..., (Xm,3), get Such as Figure 8 Shown sine wave sequence, spectrum analysis and Fourier transform analysis are carried out to described sine wave sequence, obtain as Figure 10 The spectrum analysis diagram of the s...

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Abstract

The invention belongs to the field of sedimentary stratigraphy, and relates to a method for analyzing cycle strata based on a lithological midpoint sinusoidal interpolation model. The method for analyzing the cyclic strata based on the sinusoidal interpolation model of the lithological midpoint in the present invention calibrates the middle points of different lithological units on the section of the cyclic stratum, and uses the middle points of different lithological units to indicate the periodic fluctuation of the original depositional signal Features; the method for analyzing cycle strata based on the lithology midpoint sinusoidal interpolation model in the present invention avoids the boundary problem of different lithology units, thus it is not necessary to discuss the material transfer and compaction of lithology boundaries in the diagenesis process, and can It effectively solves the problem of a large number of interference signals generated by the rectangular wave sequence established based on the lithological boundary model, highlights the target astronomical signals in the frequency domain, and improves the simulation matching effect of the original sediment and astronomical signals.

Description

technical field [0001] The invention belongs to the field of sedimentary stratigraphy and relates to a method for analyzing cycle strata based on a lithological midpoint sinusoidal interpolation model. Background technique [0002] Lithological cycle is a phenomenon in which different lithological units are deposited alternately and repeatedly in sedimentary strata; lithological cycle is the most intuitive form of cycle stratigraphy on geological sections, and it is also an important paleoclimate substitute indicator in cycle stratigraphy research; Compared with the cycle changes of other paleoclimate indicators (such as magnetic susceptibility, oxygen isotope, etc.) The thickness change of lithological units is used as a paleoclimate indicator to establish a stratigraphic sequence of lithological changes, which is a very convenient and effective method for cycle stratigraphic analysis; compared with other paleoclimate indicators (such as magnetic susceptibility, oxygen isot...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/00
CPCG06F2218/02G06F2218/08
Inventor 姚旭李素
Owner LANZHOU UNIVERSITY
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