Method for detecting deep jet-flow sedimentary deposit based on natural gamma-ray spectrum logging

Abstract

The invention provides a method for detecting a deep jet-flow sedimentary deposit based on natural gamma-ray spectrum logging. The method comprises the steps of 1, selecting a drilled well or a drilled hole; 2, calculating the contents of uranium and thorium elements in the stratum; 3, analyzing the contents of uranium and thorium elements, and screening out a high uranium layer section; 4, identifying the vertical distribution of the jet-flow sedimentary deposit; 5, determining the thickness, continuity and uniformity of the jet-flow sedimentary deposit; 6, determining the depth position, the distribution layer position and the thickness change of the jet-flow sedimentary deposit; and 7, determining the spatial form and the metallogenic law of the jet-flow sedimentary deposit, and predicting a favorable exploration area. According to the method, the uranium content and the thorium content in the stratum are obtained by utilizing the characteristics of uranium enrichment and high uranium-thorium ratio of the SEXDEX type ore deposit and combining natural gamma-ray spectrum logging analyzing, and a continuous longitudinal section of the uranium content and the uranium-thorium ratio is established; and the method provided by the invention is a method for rapidly, accurately and economically screening out favorable SEDEX ore deposit exploration targets in the deep stratum.

Description

technical field [0001] The invention belongs to the field of mineral resources exploration; in particular, it relates to a method for detecting deep jet-flow sedimentary deposits based on natural gamma energy spectrum logging. Background technique [0002] With the continuous reduction of surface and shallow solid mineral resources, the exploration of solid mineral resources is gradually advancing to the deep. The rock geochemical method (also known as the primary halo method) is the main method to find solid mineral deposits or ore body exploration at home and abroad. Rock geochemical anomalies between the surrounding rocks, which in turn determine the distribution of ore deposits or ore bodies. [0003] The existing technology is mainly based on rock geochemical methods. Such methods mainly collect samples by selecting spatial locations where hydrothermal uranium deposits may develop, and carry out related mineral identification and elemental analysis; on the basis of the...

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Problems solved by technology

Therefore, this type of technology needs to collect a large number of rock samples, but it is difficult to drill and coring deep formations, and it is difficult to achieve continuous sampling similar to surface or shallow formations

[0006] (2) The experiment is expensive and time-consuming

[0009] As mentioned above, the rock geochemical exploration method has two shortcomings in the exploration of SEDEX deposits in deep formations: 1. The demand for samples is large, and the sampling of deep formations is difficult; 2. The experiment costs are high and time-consuming

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