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Kvasov I.E.,Moscow Institute of Physics and Technology | Leviant V.B.,Central Geophysical Expedition CGE | Petrov I.B.,Moscow Institute of Physics and Technology
76th European Association of Geoscientists and Engineers Conference and Exhibition 2014: Experience the Energy - Incorporating SPE EUROPEC 2014 | Year: 2014

The work investigates seismic response from a formation with vertical fluid-saturated fractures the size of a few meters -meso-fractures -by employing the grid-characteristic method of 2D numerical modeling. The composition is determined of the response energy recorded on receiver's horizontal and vertical components, and the impact is also determined that the seismic response experiences when the fracturing parameters vary. It has been established that the front of scattered converted waves recorded on receiver's horizontal component is most intense and robust element of the response from a zone of meso-fractures in a reservoir. Analysis of wave processes confirms abnormally high attenuation of S-waves inside a fractured reservoir. This explains why a front of scattered converted waves emerges from only first few fracture rows; consequently, such front is little contingent on the reservoir thickness, which makes it possible to detect fracturing in thin formations. Validation is provided for direct 3C-recorded seismic responses as a tool for mapping fractured zones in a flat-layered section. Source


Leviant V.B.,Central Geophysical Expedition CGE | Petrov I.B.,Moscow Institute of Physics and Technology | Kvasov I.E.,Moscow Institute of Physics and Technology | Muratov M.V.,Moscow Institute of Physics and Technology
76th European Association of Geoscientists and Engineers Conference and Exhibition 2014: Experience the Energy - Incorporating SPE EUROPEC 2014 | Year: 2014

Modeled were oriented vertical macro-fracture systems (potential fluid conduits), with fractures being the length of seismic wave and fracture thicknesses by a factor of 104-5 smaller than the wave length. The numerical 2D-modeling was performed using grid characteristic method with boundary conditions (contact conditions) accurately specified on the surface of each fracture, and with the results displayed as seismograms of vertical and horizontal components on the day surface. It was established that the principal elements of seismic response were fronts of scattered P-, S-and converted waves on Z and on X components respectively. The scattered converted wave front was noticed to be the dominant element of seismic response when the macro-fracture system is fluid-saturated, as it is much stronger on horizontal X component than the scattered P-wave front on vertical Z component. In widely-spread multi-layered sections with horizontal boundaries and fluid-saturated fractures, the identification of scattered converted wave front becomes far more advantageous as an indicator of macro-fracture system presence in productive formations. The article shows that these wave fronts are formed with sufficient robustness to realistic seismic acquisition conditions. Amplitude anomalies produced by scattered converted wave fronts on X-component seismograms can be used for detecting such fracture systems. Source


Voykov G.G.,Venineft LLC | Zhukova O.S.,Venineft LLC | Arapova A.I.,CGE JSC | Gritsenko A.M.,CGE JSC | And 3 more authors.
4th International Conference and Exhibition: New Discoveries through Integration of Geosciences, Saint Petersburg 2010 | Year: 2010

This work describes refinement of geological structure of the group of traps on the shelf of the Sakhalin island. The integrated interpretation of seismic and well logging data technology presented includes: detail analysis of tectonic faults system, rock physics analysis, up-to-date AVA seismic inversion software implementation, technology of reservoir properties, reservoirs presence and pore saturation prediction. Subsequent well logging data is well correlated with the predicted values. Source


Loginov D.V.,Central Geophysical Expedition CGE | Lavrik A.S.,Central Geophysical Expedition CGE
4th International Conference and Exhibition: New Discoveries through Integration of Geosciences, Saint Petersburg 2010 | Year: 2010

In this article we represent new technology which can improve performance of the reservoir properties prediction based on the seismic and well data, while using neural networks as prediction mechanism. This technology contains three main steps . 1-st step - Statistical or neural model based attributes selection and transformation. 2-nd step - Formal (algorithmic) or informal (geological) clustering of the source area. 3- rd step - Special (modular) learning of the set of neural networks and construction of the cooperative network to predict reservoir properties. Especially this work represent the use of modular, cooperative neural networks to improve generalization accuracy of quantitative interwell reservoir properties approximation using seismic attributes, well data and formal and informal data clustering techniques. There is also the real sample to show modular neural networks improved performance. Source


Inyushkina A.A.,Central Geophysical Expedition CGE | Yalikov M.U.,Central Geophysical Expedition CGE | Tsareva S.A.,Central Geophysical Expedition CGE | Kim N.P.,Central Geophysical Expedition CGE | And 2 more authors.
4th International Conference and Exhibition: New Discoveries through Integration of Geosciences, Saint Petersburg 2010 | Year: 2010

This paper presents the results of the analysis of tectonic faults in the western part of the Samotlor field based on 3D seismic data. Most faults are characterized by the same type of deformations and similar orientation, generating the basic south east - north west oriented spread system. The slopes of the local structures are controlled by these faults. Identified faults ranging made it possible to divide the field into two blocks with different strain state. Thus, upper Jurassic and lower Cretaceous faults are located in the southern part. In the north western part of the area only the Prejurassic and Middle Jurassic faults are identified. This conclusion is also confirmed by paleotectonic reconstructions, that reveal the existence of relatively differently directed vertical movements of the southern and northern blocks. It is found out that there is a submeridional seam zone within the area. The eastern group of the uplifts tends in its tectonic regimen to the Samotlor field, the final development stage of which was over in the alpine phase. The primary phase of the western group uplifts formation refers to the Early Cretaceous. Thus, the seismic data show the leading role of faults in the formation of structures. Source

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