Abstract
In this paper is presented hydro-geodynamics and geodynamics in the South Urals. Seismicity and geodynamics induced by hydrocarbon production by summarizing the published case studies are considered. Changes in hydro-and gas dynamics affect changes in the geodynamics of the crust. Natural and technogenic changes in bowels of the Earth are usually entail tectonic movements and deformations of earth’s surface, which is one of the important factors determining environmental changes and requiring mandatory consideration in engineering-geological surveys and exploitation of deposits. The approach is based on identified changes in hydrogeodinamics, stress-deformation state and seismic activity in areas of mineral resources of oil and gas fields. Negative geodynamic processes occurring on the territory of the Eastern Orenburg Region are identified. The analysis of the geodynamic state of the subsurface of the Eastern Orenburg Region is carried out. Based on the analysis, conclusions are made about possible causes of the geodynamic processes. An effective method for observing geodynamic processes using a seismological network is proposed and justified. A method of organizing a geodynamic polygon on a mineral field under development using a network of seismic stations has been developed.
Highlights
Geodynamics of the Southern Cis-Urals region are poorly understood, since the region is located inside the platform, and platform territories are considered to be geodynamically low-active and low-seismic
The approach is based on identified changes in hydrogeodinamics, stress-deformation state and seismic activity in areas of mineral resources of oil and gas fields
Negative geodynamic processes occurring on the territory of the Eastern Orenburg Region are identified
Summary
Geodynamics of the Southern Cis-Urals region are poorly understood, since the region is located inside the platform, and platform territories are considered to be geodynamically low-active and low-seismic. The basis for identifying reasons for increase in seismic activity during hydrocarbon production is based on the results of studies of hydro-gas-dynamic, geodynamic and geophysical processes and water systems dynamics in the regions of developed hydrocarbon fields. Decrease in pressure in a water system that unites formation waters and surrounding aquifers of a hydrocarbon field, violates natural geodynamic state of the host rocks during hydrocarbons withdrawal and its increase during water injection. It destabilize dynamic balance between water and a solid part of the Earth's crust [8]
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