«Oilfield engineering»

Construction of a detailed three-dimensional lithological-facial model based on the geological and geophysical data integration on the example of the Bobrikovsky deposits of the Batyrbayskoe field in the Perm region

UDC: 550.8.072:553.98(470.53)
DOI: 10.33285/0207-2351-2022-11(647)-5-14

Authors:

¹ LUKOIL-Engineering Limited PermNIPIneft Branch Office in Perm, Perm, Russia

Keywords: oil and gas potential, field, oil, facies, terrigenous reservoir, permeability, porosity, lithofacies model, core, 3D seismic survey, seismic forecast, paleochannels, reservoir properties, sedimentation environments, Visean terrigenous oil- and gas-bearing complex, variogram, stochastics

Annotation:

A continuous process of improving the efficiency of hydrocarbon fields’ development requires a high quality geological basis. The reliability of a geological model depends both on the completeness, quality and consistency of the initial geological-geophysical information and on the degree of knowledge of a reservoir geological structure.

All large fields in the Perm region are mature and drilled by a dense grid of wells. But even in case of a sufficient amount of well data, the distribution of properties in the inter-well space can lead to a different interpretation of the geological situation. This is especially true for laterally unstable continental deposits, in particular, of alluvial genesis.

One of the most effective measures for reducing uncertainties in the inter-well space is the dynamic interpretation of 3D seismic data, the results of which can be used for prediction of the effective thicknesses, facies zoning, and distribution of reservoir properties. But it should be taken into account that the forecasts, based on the results of 3D seismic survey data interpretation, have a number of limitations, since the seismic surveys have a relatively low vertical resolution. Therefore, to build a conceptual geological model, it is necessary to use a complete set of integrated geological and geophysical information, including core study data, genetic analysis of well logging data and seismic forecasts.

This article discusses the results of building a three-dimensional geological model of the Bobrikovsky deposits of the Batyrbayskoe field in the Perm territory using a full set of geological-geophysical information. Bobrikovsky deposits are one of the most attractive objects for development on the territory of the Volga-Ural oil- and gas-bearing province. Genetically, the Bobrikovsky horizon in the area under study is mainly represented by continental deposits. Reservoirs of the Bobrikovsky age have increased values of porosity and permeability properties and effective thicknesses relative to other terrigenous objects of the Volga-Ural region (VUR). The main role in the generation of highly permeable reservoir rocks of the Bobrikovsky age was played by the activity of paleo-rivers. It is during the Bobrikovsky time that the area of the alluvial-deltaic plain within the studied region reached its maximum size. At the Batyrbayskoe deposit as well as at most VUR deposits, two cyclites are distinguished in the bobrikovsky horizon.

The results of the study of the Visean terrigenous sequence, including the bobrikovsky deposits, are presented in the works of V.I. Pakhomov, I.V. Pakhomov and E.K. Stashkova. According to 3D seismic survey data, considerable contribution to prediction of facial zones and effective thicknesses in Bobrikovsky deposits of the Perm Pre-Kama region was made by S.V. Ladeyshchikov and I.S. Putilov.

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