Method for analyzing cycle stratum based on lithology midpoint sine interpolation model

An interpolation model and lithology technology, applied in the field of sedimentary stratigraphy, can solve the problems of increasing the difficulty of identifying target astronomical signals in the formation, multiple interference peak spectra, etc., and achieve the effect of improving the simulation matching effect and solving a large number of interference signals

Active Publication Date: 2019-09-20
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 stratum based on lithology midpoint sine interpolation model
  • Method for analyzing cycle stratum based on lithology midpoint sine interpolation model
  • Method for analyzing cycle stratum based on lithology midpoint sine 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, 0 f(t)=Acos ωt 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 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 ...

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Abstract

The invention belongs to the field of sedimentary stratigraphy, and relates to a method for analyzing a cycle stratum based on a lithology midpoint sine interpolation model. According to the method for analyzing the cycle stratum based on the lithology midpoint sine interpolation model, middle point locations of different lithology units on a cycle stratum section are calibrated, and periodic fluctuation characteristics of original deposition signals are indicated through the middle point locations of the different lithology units. The method for analyzing the cycle stratum based on the lithology midpoint sine interpolation model avoids the boundary problem of different lithologic units, therefore, the material transfer and compaction effects of the lithologic boundary in the diagenetic process do not need to be discussed, the problem that a large number of interference signals are generated by the rectangular wave sequence established based on the lithologic boundary model can be effectively solved, the target astronomical signal in the frequency domain is highlighted, and the simulation anastomosis effect on the original deposition and the astronomical signal is improved.

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 Applications(China)
IPC IPC(8): G06K9/00
CPCG06F2218/02G06F2218/08
Inventor 姚旭李素
Owner LANZHOU UNIVERSITY
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