Shallow stratum boundary division method based on sediment quality factor and echo loss level curve peak and valley

Abstract

The invention provides a shallow stratum boundary division method based on the sediment quality factor and the echo loss level curve peak and valley. The method comprises the steps of (1) eliminatingmultiples from sea surface and the shallow stratum boundary in original shallow stratum profile data by combining a predictive deconvolution method and a feedback loop method; (2) performing submarineline tracking to align the shallow stratum profile data with borehole data; (3) identifying plain peaks of the shallow stratum boundary by using the echo loss level curve peak and valley, and extracting stable peaks of in the stratum boundary according to the stability of the stratum trend; (4) calculating a control peak of the stratum boundary by combining with the sediment quality factor on thebasis of the stable peaks of the stratum boundary; (5) based on the control peak of the stratum boundary, searching for the plain peaks satisfying requirements, that is, obtaining a high-reliabilityshallow stratum boundary; and (6) assessing the precision of the stratum boundary division method by the use of borehole sampling data. The method in the invention not only can realize the automationand intelligentization of stratum boundary division, but also can accurately classify the shallow stratum boundaries and achieve the precision of the same magnitude with the borehole sampling data.

Description

technical field [0001] The invention relates to the field of marine geological engineering, in particular to the stratum boundary division of seabed shallow formation or deep formation region. Background technique [0002] Due to the increasing demand for marine renewable energy, raw material extraction and related infrastructure, human activities on the offshore seabed will increase significantly, and accurate seabed maps will become necessary for this purpose (Walree et al., 2006 ; Saleh and Rabah, 2016). These applications require detailed information about the topography of the seabed and the substratum structure of the shallow seabed. With the development of underwater acoustic technology, the shallow formation profiler (shallow section) is an effective remote sensing acoustic detection equipment. Compared with the traditional drilling sampling method, using shallow section to obtain shallow formation bottom structure can greatly save time and cost and cost of capital...

AI Technical Summary

Problems solved by technology

[0005] (1) At present, the manual division method of layer boundaries in shallow formation images is inefficient, the degree of automation is not high, and the division of layer boundaries is relatively subjective;

[0006] (2) It is difficult for general image processing technology to achieve accurate and continuous division of layer boundaries, and when one method is used alone, it is easy to misjudge layer boundaries or miss the identification of real layer boundaries

[0007] (3) In the process of identifying layer boundaries, it takes too long, resulting in a great waste of time and resources

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