GEOLOGICAL MODELLING OF VIKULOVSKAYA SUITE PRODUCTION DEPOSITS

Abstract

The relevance. The tasks of researching, exploring, assessing oil and gas, designing, field developing are solved on the basis of geological models. Along with the fact that modern geological modelling allows obtaining three-dimensional descriptions of deposit, studying the character and variability of parameters of the formation and fluids saturated it, it allows as well estimating the uncertainties that inevitably arise in geological modelling of the formation. Thus, the accuracy of the solution of any geological problem is mainly determined by the adequacy of the three-dimensional model of the object. It is necessary to involve in addition to empirical data all kinds of indirect information in geological model. It is necessary to study sedimentation in time and space for detailed prediction of the size and shape of the reservoir, the distribution of zones of improved reservoir and correct construction of the geological model. The main aim of the research is to improve the methods of geological three-dimensional modelling taking into account the conditions of sedimentation. This is caused by the fact that the lithofacial characteristics of production deposits are the main factors of heterogeneity of reservoir and oil-saturation of reservoirs. The technique that takes into account the facial structure of deposits allows constructing a discrete-continuous three-dimensional geological model, which describes correctly the geological object under study and has significantly higher prognostic properties. Objects: vikulovskaya suite production deposits of Em-Egovskii licensed precinct. Methods: detail well correlation, improved electrometric method of facial diagnostic, deterministic and stochastic methods of double dimensional and three-dimensional geological modelling. Results. The authors have constructed the facial model by the core and GRW data, based on the improved technique of V.S. Muromtsev. The facial model includes the following facies groups: far beach area, transition beach area and pre-frontal beach area. A detailed correlation was carried out with the data of the new 192 wells. Three sedimentation cycles were distinguished within the formation VK1, according to the results of correlation. This cycles are characterized by a good consistency in the area. Based on more accurate seismic data and new wells data using sedimentation conditions the authors developed the refined model of vikulovskaya suite production deposits of Em-Egovskoe field. The geological structure of vikulovskaya suite production deposits has changed greatly according to the constructed model. External testing confirmed high accuracy and high prognostic properties of the developed geological model. The area of the deposits, oil-saturated thickness of the deposit and geological reserves have decreased according to the updated structure. The refinement and detailing of the formation structure will improve the efficiency of additional exploration of poorly studied parts and development. The proposed model of VK deposits is used to create a hydrodynamic model and to justify the most effective geological and technical measures.

Keywords

• seismic data
• core
• geophysical well research data
• well correlation
• conceptual model
• geological model
• vikulovskaya suite
• deposit