Ph.D. Theses

Modeling of petrophysical and reservoir properties of sedimentary rocks in oil-gas deposits (as an example: Peschany-Denis and Bulla-Deniz deposits)

Abbasov Elmaddin Yagub

2507.01 - Geophysics, geophysical methods of reconnaissance of the minerals

Numerous studies show that in the known deposits in the producing structures are still a large number of non-extracted reserves of hydrocarbons. In this regard, it remains highly relevant detailed study of the petrophysical properties of the reservoir-beds, identified and are in the development of oil fields, and the creation of spatial models of oil-and-gas-bearing objects.

Past research in this paper, theoretical generalization and analysis of geophysical data lead to the following conclusions:

On the geomorphologic, geologic-tectonical, lithologic-stratigraphical features SCB can be considered a classic example in the field of hydrocarbon accumulations, which have a great prospects of recoverability of reserves.

According to the study of reservoir rock properties at normal pressure and temperature values for areas of the Apsheron archipelago, the South-Absheron zone, Baku archipelago and the Lower Kura depression zone, carried out a comparative analysis of radioactivity, conductivity coefficient of sandy and aleurite sediments, also the drawn up of the histogram distribution of reservoir properties.

Generalizations results showed that within the studied areas on the component composition and the presence of aleurite sediments clay materials are two-component derivatives. And within the Absheron archipelago and South-Absheron zone, on mineralogical composition of clays predominate in hydromics and hydromycoses montmorillonites.

To account for the above specified, has been calculated the average correcting factor that can be used in the evaluation of oil and gas reserves.

As a result of modeling the spatial distribution of normal and high reservoir pressures and comparative generalizations on the effect of thermo baric to the collecting properties of the rocks, it was established the patterns of changes in temperature and the depth of the reservoir pressure for the Gum-Deniz field and also identified elevated reservoir pressure values within the areas of depression.

It was refined linear dependence of the velocity of longitudinal and transverse waves, respectively, for sandstones, clays and dolomite, which enabled to reveal dependence Vp/Vs=f(H) and (p,)= f(H) for Bulla-Deniz field, also established the existence of extremums values of the elastic parameters at certain depths and related fluid-containing rocks.

Similar studies have been conducted to Baku and Absheron archipelagos. In order to increase the reliability of high-speed models of reservoirs (in Meso-Cenozoic and middle Pliocene sediments) it used the method of approximation of graphic dependence of speed of seismic waves in the reservoir vertically (V=f(H)).

On the basis of calculated regression equations depending of fluid content (kp and kper) of oil and gas reservoirs on the depth, clay and carbonate contents were detected maximum and minimum values of the hydraulic radius, dynamic cross-section of the capillaries and the radius of the pore channel of filtration.

It was proposed a mathematical model for the terrigenous deposits of Gum-Deniz field and also it were produced graphical dependences of the residual water and oil and gas saturation, electro conductivity and phase fluid conductivity. At the same time for forecasting dynamics of productivity of oil and gas reservoirs are simultaneously used GIW materials and data of core tests.

It was conducted facial analysis of Gum-Deniz field and it were produced 3D model, which takes into account the peculiarities of the geological section and the distribution of petrophysical parameters, also to substantiate further opportunities of increasing the efficiency of field development and revaluation of resources.