Abstract
This paper discusses the productive beds of the Urna and Ust‐Tegus oil fields (West Siberia, Russian) and permeability and capacity properties that are influenced by geodynamic processes. Strong tectonic processes, accompanied by periodic magma intrusions, produced numerous fractures and faults in the Jurassic sediments, which act as conduits for groundwater flows, and thus led to the hydrothermal alteration of rocks and changes in the pore space. The data presented in the paper testify to the manifestation of these processes in the modern hydrogeochemical and geothermal conditions of the Jurassic‐Cretaceous sediments within the two oil fields and their vicinity. The petrophysical studies of the core samples and the hydrodynamic studies in the wells confirm that the reservoir properties of the productive strata are considerably heterogeneous. Despite the significant effect of the geodynamic factors, the analysis of the tracer data has not revealed any apparent spatial consistency of the presence (or absence) of a hydrodynamic connection between the wells and the locations of fractured and dynamically stressed zones. In our study, we have proposed and tested a method based on the analysis of morphotectonic features detectable in the depth maps of reference surfaces. This method is a useful additional tool for discovering and analyzing the relationships between the tectonic and hydrodynamic conditions of oil and gas fields.
Highlights
Geodynamic processes are among the most im‐ portant natural processes influencing the structure and properties of sedimentary strata
In West Siberia, the Urna and Ust‐Tegus oil fields are typical cases showing the significant influence of geodynamic factors on the structure and properties of productive sediments, as well as the problems expe‐ rienced during the field exploration and development, and the problem solving approaches
The exploitation of these oil deposits and the effectiveness of enhanced oil recovery (EOR) techniques are considerably in‐ fluenced by faults and fractures detected by geological and geophysical studies [Vashchenko et al, 2005; Kur‐ chikov et al, 2013; Prokhorov et al, 2012; Khasanov et al, 2004]
Summary
Geodynamic processes are among the most im‐ portant natural processes influencing the structure and properties of sedimentary strata. In West Siberia, the Urna and Ust‐Tegus oil fields are typical cases showing the significant influence of geodynamic factors on the structure and properties of productive sediments, as well as the problems expe‐ rienced during the field exploration and development, and the problem solving approaches. The exploitation of these oil deposits and the effectiveness of enhanced oil recovery (EOR) techniques are considerably in‐ fluenced by faults and fractures detected by geological and geophysical studies [Vashchenko et al, 2005; Kur‐ chikov et al, 2013; Prokhorov et al, 2012; Khasanov et al, 2004]. A challenging task is to analyze and predict the spatial patterns of changes in hydrodynamic pro‐ perties of the productive sediments, which is of im‐ portance for both theoretical modeling of the relation‐ ships between geodynamic and hydrodynamic condi‐ tions and technologies aimed at the efficient develop‐ ment of the oil and gas fields in West Siberia
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