«Geology, geophysics and development of oil and gas fields»

Methodology and results of determination of fluid contacts of the Morskoye-West-Rakushechnoye field under conditions of geological uncertainty

UDC: 622.276.5/6
DOI: -

Authors:

¹ National University of Oil and Gas "Gubkin University", Moscow, Russia
² Sergo Ordzhonikidze Russian State University for Geological Prospecting, Moscow, Russia

Keywords: fluid contact identification, petroleum reserves estimation, oil field development plan, North Caspian, offshore field, geology, formation testing, well logging, pressure gradients, oil-water contact

Annotation:

The article provides a substantiation of probable oil-water contact in conditions of geological uncertainty – the absence of penetration of the aquifer in the Aptian stage (K1a) in exploration and appraisal wells 1-M and 1-WR, as well as the absence of the testing data of the Aptian stage (K1a) of the Morskoye-West-Rakushechnoye field, which determine the boundaries in the geological and hydrodynamic model for subsequent quantitative assessment of geological reserves and development design.

In the course of the work methods for identifying fluid contacts were applied, including interpretation of geophysical well surveys, petrophysical core studies and analysis of formation tester data, which made it possible to determine fluid contacts in several variants.

Based on the analysis of complex data for determining fluid contacts, as well as the unity of oil properties, the presence of a hydrodynamic connection between the Aptian stage and the Neocomian superstage (K1nc) was confirmed. With a single aquifer in wells 1-M and 1- WR, the probable water-oil contact is at absolute elevations of 1365,7 and 1363 m, respectively, which allows the field to be transferred to the large category. At the same time recoverable oil reserves increase twofold to 64 million tons. The specified depth marks are recommended for acceptance for calculating reserves in the geological and hydrodynamic model of the field.

However, taking into account the general pressure gradient of the aquifer within the license area, the method of extrapolating the pressure gradients for oil of the Aptian stage (K1a) to the pressure gradient for water in the Neocomian superstage (K1nc) was applied. As a result of calculations, it was shown that the probable water-oil contact in wells 1-M and 1-WR is at absolute elevations of 1378,5 and 1376 m, respectively. The presence of the noted contacts at the indicated depths leads to an increase in oil reserves.

Based on the obtained results, recommendations were given on the location of the project appraisal well to check the established options for oil-water contacts.

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