The biological and hydrothermal environmental process of fluidization zones of oil-and-gas bearing rock in the seismic field of the North-Taz Basin
  • Article Type: Research Article
  • Eurasian Journal of Biosciences, 2020 - Volume 14 Issue 1, pp. 835-842
  • Published Online: 15 Apr 2020
  • Open Access Full Text (PDF)

Abstract

The article reflects the study results of oil and gas bearing rocks of the North-Taz Basin. The interconnection of oil seismology and hydrothermal processes is pointed by the example of local and integral seismic effects. We determined that the fluidization processes are associated with the activation of abdominal faults and are secondary to the previously formed classical zones of epigenesis. Based on paragenetic mineral associations and epigenetic changes in the rocks of the study area, new types of hydrothermal-metasomatic formations are identified - mudstones and fluidisites. The lithogeochemical anomalies of potassium, phosphorus, iron, fluorine, and arsenic confirm the presence of vertical migration and are linked to the morphological features of the reflecting horizons of the study area. The results of determining the petrochemical modules for the Turonian-Maastrian reserves confirm that the lithogeochemical anomalies of the selected group of elements are associated with the Late Cretaceous stage of activation of deep-seated processes. According to the results of X-ray diffraction analysis, three main complexes of clay minerals of the sedimentary section were identified: montmorillonite-kaolinite, hydromicaceous-chlorite, hydromicaceous-chlorite-zeolite. It was established that the presence of montmorillonite is a distinctive feature of these reserves and its presence leads both to high reliability of tires and to a significant deterioration in the reservoir properties of sand varieties. Zeolites are defined as indicators of diagenetic transformation of rocks. For micaceous mineral, the most common polytypic varieties were identified, characterizing the presence of a hydrothermal process. According to electron microscopic studies of the composition of the rocks, their pore space, and the analysis of the geological characteristics of the study area, six types of integral fluidization zones and three local levels were established. The mineral composition of the fluidization zones was characterized as a result of hydrothermal-metasomatic transformations of the corresponding rock complexes. Assumptions are made about the forms of bodies of hydrothermally transformed rocks, defined in the field of seismic waves, as the results of the development of fluid zones of a certain mineral type and similar to primary halos of ore reserves. The characteristics of the zones of colmatation of two types are given that affect the flow rate of wells and form a new type of metasomatic traps for oil and gas reserves.

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