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Method for recovering non-uniform erosion thickness through utilizing cycle analysis method

A technology of denudation thickness and analysis method, which is applied in the field of geological exploration, can solve problems such as large errors, inability to restore denudation thickness, and limited application range, etc., and achieve the effects of low cost, reduced oil and gas exploration risks, and wide application range

Inactive Publication Date: 2017-03-22
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

[0005] Aiming at the above-mentioned technical problems that the existing methods for recovering unconformity denudation thickness have large errors, limited scope of application, and cannot restore denudation thicknesses of different layers, the present invention proposes a method for recovering unconformity denudation thickness by using cycle analysis method The method can effectively restore the sedimentation-denudation state of the study area in the entire geological history period, and can restore the denudation thickness of different denudation strata, and the method has high accuracy and wide application range

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  • Method for recovering non-uniform erosion thickness through utilizing cycle analysis method
  • Method for recovering non-uniform erosion thickness through utilizing cycle analysis method
  • Method for recovering non-uniform erosion thickness through utilizing cycle analysis method

Examples

Experimental program
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Effect test

Embodiment 1

[0073] In the Longfengshan area of ​​the Changling fault depression in the Songliao Basin, a typical well B202 was selected. This well is located in the southeast gentle slope of the Longfengshan area. The Cretaceous strata drilled by the well are Mingshui Formation, Sifangtai Formation, Nenjiang Formation, Yaojia Formation, Qingshankou Formation, Quantou Formation, Denglouku Formation, Yingcheng Formation, Shahezi Formation (not penetrated).

[0074] To restore the unconformity denudation thickness of Well B202, the steps are as follows:

[0075] S1 deposition rate curve drawing:

[0076] Combining the stratum stratification data, stratum chronology and mud logging data of Well B202, the decompaction correction is carried out through the empirical formula method, the compaction coefficient is calculated by formula (6), and the original thickness of the formation before compaction is calculated by formula (4) , according to the stratigraphic chronology to determine the start ...

Embodiment 2

[0093] The difference from Example 1 is that this example uses the mudstone sonic transit time method to verify the accuracy of the obtained unconformity denudation thickness. Except for the method verification step, the other steps and the data results obtained are the same as in Example 1. Since the mudstone sonic transit time method is a commonly used method to restore the denuded thickness of unconformity, it will not be described here. The unconformity denudation thickness of the Denglouku Formation in Well B202 calculated in this example is 379.69m, and the result calculated by the mudstone sonic time difference method is 408.19m, and the error rate of the two is 6.98%, less than 10%. It can be seen that this implementation The method of recovering the denudation thickness of unconformity provided by the cycle analysis method is reliable and effective.

Embodiment 3

[0095] Restoring the unconformity denudation thickness of Well B204 in the Longfengshan area of ​​the Changling Fault Depression in the Songliao Basin. Except for the method verification steps, the rest of the steps are the same as in Example 1. The calculated unconformity denudation thickness of Well B204 is 418.09m. This example The accuracy of the obtained unconformity denudation thickness was verified by inclusion homogeneous temperature method. Since the inclusion uniform temperature method is a commonly used method to restore the thickness of unconformity denudation, it will not be repeated here. The result calculated by the method of uniform temperature of the first type of inclusion is 388.58m, with an error rate of 7.60%; the result calculated by the method of uniform temperature of the second type of inclusion is 446.15m, with an error rate of 6.29%. It can be seen that the method for recovering the denudation thickness of unconformity provided by the cycle analysis ...

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Abstract

The invention provides a method for recovering non-uniform erosion thickness through utilizing a cycle analysis method and belongs to the technical field of geological exploration. The method provided by the invention comprises the following steps: calculating a compaction coefficient and an original thickness of a stratum before compaction through decompaction correction; calculating an average stratum deposition speed of each deposition period and drawing a deposition rate curve; determining a missed curve section according to the deposition rate curve; reckoning a period corresponding to the missed curve section and transverse coordinates corresponding to a wave peak and a wave trough of the missed curve section; carrying out frequency-divisional processing on the deposition rate curve to obtain a low-frequency wavelet and a high-frequency wavelet, reckoning longitudinal coordinates corresponding to the wave peak and the wave trough of the missed curve section; and recovering the complete deposition rate curve according to frequency spectrum analysis, and calculating the non-uniform erosion thickness through complete deposition rate curve integral. According to the method provided by the invention, a stratum deposition-erosion state of a whole geological historical period can be effectively recovered, the erosion thickness of different erosion stratum layers is recovered, and the method is high in accuracy and wide in applicable range.

Description

technical field [0001] The invention belongs to the technical field of geological exploration, and in particular relates to a method for recovering unconformity denudation thickness by using a cycle analysis method. Background technique [0002] Restoring the denuded thickness of unconformities is an important part of basin structural evolution analysis and hydrocarbon accumulation research, and the accuracy of the results has an important impact on the evaluation of source rock thermal evolution, reservoir development and transformation, hydrocarbon migration and accumulation and preservation conditions. [0003] At present, there are many methods for recovering the denudation thickness of unconformities, including the mudstone acoustic time difference method, the vitrinite reflectivity method, the inclusion uniform temperature method, and the seismic trend analysis method based on seismic interpretation, the adjacent layer thickness ratio method, and the reference layer thi...

Claims

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Application Information

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IPC IPC(8): G01V1/50G01N33/24
CPCG01N33/24G01V1/50G01V2210/614
Inventor 蒋有录范婕刘景东崔小君张惠
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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