Известия Томского политехнического университета: Инжиниринг георесурсов (Dec 2019)

CORRELATION ANALYSIS OF THE MAIN BOUNDARIES OF A SEDIMENTARY COVER OF THE NORTH-USTYURT REGION

  • Auez E. Abetov,
  • Yuriy A. Volozh,
  • Akmaral T. Niyazova

DOI
https://doi.org/10.18799/24131830/2019/12/2418
Journal volume & issue
Vol. 330, no. 12
pp. 179 – 188

Abstract

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The relevance of the research is caused by the need to increase the resource base of the Republic of Kazakhstan for discovery of new oil and gas fields in the North-Ustyurt region. The main aim of the research is to determine the correlation of structural elements of major geostuctures of North Ustyurt region. Object: surface of the basement and Paleozoic, pre-Jurassic surface and Crateceous base of the North Ustyurt region. Methods: conversion to digital format a series of structural maps: by the surface of the basement, Paleozoic, pre-Jurassic surface and Crateceous base of the North-Ustyurt region using Didger, Surfer, ArcGIS, Geosoft software tools; quantitative correlation analysis of the main geological boundaries in the COSCAD 3D software package. Results. The authors have singled out three groups of geostructures in the Ustyurt region by the nature of correlation of the surface of the basement and paleozoic, the bottom of the Jurassic and Cretaceous sediments. The first group includes mobile fold systems and «mobile corners», in which the correlation coefficients are weak, either do not appear at all (South Emba uplift, Aral-Kyzylkum arch, Central Ustyurt dislocation system, Mountain Mangyshlak). The second group is formed by internal mobile groups, isolated as large positive structures characterized by extremely high values of correlation coefficients by surface of the basement and paleozoic, the bottom of the Jurassic and Cretaceous sediments (Buzachi uplift, Aktumsuk high, Kuanish-Koskala arch, Baychagyr-Yarkimbay high). The third group of geostructures is formed by tectonic elements of the inner areas of the North-Ustyurt region (North-Ustyurt depression systems, Chelkar and Barsakelmess depressions), characterized by prolonged and inherited subsidence in the Phanerozoic and high correlation surface of the basement and Paleozoic, the bottom of the Jurassic and Cretaceous sediments.

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