Research BEKTAS Kazakhstan Oilfield Reservoir Characteristics

Aiming at these problems appears in the exploration and development of the M-0-2layer of the KZ BEKTAS field’s cretaceous system, lower cretaceous series and upper UR group, such as:M-0-2layer is or is not existing western oil ring, oil and gas and water of reservoirs in the longitudinal and plane is how to distribute, gas cap string and some high water of producing wells in the production process is how to deal with, the thesis conducts systematic study on the reservoir from many more perspective such as the formation, sedimentary facies, reservoir distribution, reservoir characteristics, structure and production dynamics.Guided by the depositional cycle theory, it makes a detailed division and correlation of strata on the research areas. Among these areas, M-0-2is divided into two small layers, between which exists stable Mudstone interlayer maker bed, and it has little change on the formation thickness on the whole and distributes stably. On the basis of the single well stratigraphic division and comparison, combined with the three-dimensional earthquake interpretation, it builds the top surface and bottom structure of the mainly target stratum. The structure configuration shows as anticline that the top of the flat is gradually steep towards to the four-wings, and the northeast wing of the anticline develops two groups of8normal faults. The research on the sedimentary facies is based on the classification of the single well facies. And combined with the characteristics of the seismic facies, it is studied that the target strata of the research area is meandering river sedimentation and the river bed subfacies controls the development of the high quality reservoir. The characteristics study of reservoir based on the core analysis shows that the reservoir physical property is better when the space mainly includes residual intergranular pore and intergranular dissolved pore. According to the detailed research on the layer, construction, sedimentation and reservoir characteristics, and synthesized with the analysis of the single well production formation testing, it is considered that the two up and down small layers of M-0-2have different oil-gas interface and oil-water interface. Because of this, the two layers of M-0-2are two independent reservoirs, and both of their reservoir types are gas-cap oil ring edge water reservoir. The thesis calculated reserves of the two oil reservoirs, the calculation results show that M-0-21oil reservoir’s reserve is much more than M-0-22oil reservoir’s. Combining with the oilfield’s current development, the calculation shows that the western oil ring has a great potential for exploration and the reserve produced degree of M-0-22oil reservoir is very low. In the end, the thesis briefly analyses the problems of the oilfield in development process and put forward some suggestions in scientific development perspective. The study achievements are useful for the oilfield in its exploration and development and it provides technical support for the oilfield to successfully completing production goals.