Sedimentary basin basement top surface form recovery and deep ore body location and prediction new method

Abstract

The present invention discloses a sedimentary basin basement top surface form recovery and deep ore body location and prediction new method. The method comprises the following steps of: the step 1: atypical exploration line profile construction petrography catalog stage; the step 2: a typical exploration line profile voice frequency telluric electromagnetic sounding measurement stage; the step 3:on-surface developed area AMT profile measurement; and the step 4: a deep buried ore and rich and thick ore body location and prediction and key target area delineation stage. The sedimentary basin basement top surface form recovery and deep ore body location and prediction new method belongs to the technical field of mineral resource exploration. The method performs construction petrography catalog, voice frequency telluric electromagnetic sounding measurement and electrical resistivity parameter measurement of the typical exploration line profile system, a priori model formed by employing construction petrography catalog is employed to perform comparison and verification of voice frequency telluric electromagnetic sounding 1D and 2D inversion sections to determine an electrical structure surface between the basin basement structural layer and a cover layer and perform on-surface extension on this basis so as to accurately extract and recover the basin basement top surface form features.

Description

technical field [0001] The invention belongs to the technical field of mineral resource exploration, and specifically refers to a new method for restoring the shape of the basement top surface of a sedimentary basin and predicting the location of deep ore bodies. Background technique [0002] The low-temperature fluid polymetallic deposits in the northwestern margin of the Tarim Basin are one of the important types of deposits. The shape of the top surface of the basement structural layer plays an important role in controlling the distribution of rich ore bodies. The existing geophysical induced polarization method bathymetry detection The depth is usually less than 600m, and the basement structure layer is usually located hundreds of meters to thousands of meters below the surface. It is difficult to detect the morphological characteristics of the top surface of the basement by the induced polarization method. The insignificant differences in magnetic and density parameters...

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Problems solved by technology

[0002] The low-temperature fluid polymetallic deposits in the northwestern margin of the Tarim Basin are one of the important types of deposits. The shape of the top surface of the basement structural layer plays an important role in controlling the distribution of rich ore bodies. The existing geophysical induced polarization method bathymetry detection The depth is usually less than 600m, and the basement structure layer is usually located hundreds of meters to thousands of meters below the surface. It is difficult to detect the morphological characteristics of the top surface of the basement by the induced polarization method. The insignificant difference in magnetic and density parameters between layers makes it difficult to effectively restore the morphology of the top surface of the substrate

The audio-frequency electromagnetic sounding (hereinafter referred to as AMT) method has the advantages of large detection depth, strong resolution, and high production efficiency. There is an obvious difference in resistivity between the basement structure and the cover layer. The use of the AMT method can effectively reflect the formation of the basement structure. However, in the application, there is a lack of comparative research under the constraints of systematic drilling, and it is difficult to accurately determine and quantify the electrical structural plane between the basement and the caprock and the accurate recovery of the top surface of the basement structural layer, resulting in Insufficient research on the important controlling factors of basement top surface shape restricts the prediction of deep mineral resources and the accurate positioning of rich ore bodies of this type of deposit

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