FEATURES OF DETERMINING ANISOTROPIC PARAMETERS FROM THE RESULTS OF TRACER STUDIES OF J11 FORMATION ON THE EXAMPLE OF OIL FIELD

Abstract

The relevance of the research lies in the necessity to maintain production at a high level. Maintaining the resource base is an important factor in financing the region's tax base Oil is a non-renewable source of energy, so humanity cannot afford to use it irrationally. It has an important factor of high calorific value and this parameter favorably distinguishes oil from other energy sources. A huge range of products is produced from oil, not to mention the use of petroleum products in internal combustion engines. And the demand for oil, despite developments in renewable energy, continues to rise. Therefore, it is necessary to increase the oil recovery factor. This requires choosing the most effective field development strategy that will reduce residual reserves. The choice of development strategy is based on the results of calculation of hydrodynamic models. Aims: to study tracer research in the J11 formation; determine the parameters of permeability anisotropy from tracer studies; compare the data obtained with the parameters of permeability heterogeneity determined by the method of spatial distribution; assess the feasibility of changing the methodology when changing the stratigraphic horizon. The object is one of the deposits in the Tomsk region. Previously, it has already been subjected to the study of anisotropic characteristics. Upper Jurassic deposits of terrigenous composition are being studied. Methods. Analysis of tracer studies leads to the solution of an important problem of determining the parameters of filtration heterogeneity and to the answer for questions about a unified approach to calculating heterogeneity parameters for different reservoirs and the comparability of the results obtained with the distribution of heterogeneity parameters according to well logging. The technique involves determining the amount of indicator fluid transferred from injection to production wells. In addition, permeability is analyzed and rose diagrams of the distribution of parameters are created. The previously tested method of spatial distribution of parameters according to geophysical surveys of wells is used. Tracer studies are used to verify the reliability of calculations based on log data. As a result of calculations and studies, it was possible, using the analysis of tracer studies, to confirm the anisotropy parameters obtained from the results of well logging. Very close parameter values were obtained. The analysis of tracer studies showed that the use of the technology for determining and accounting for the anisotropy of permeability previously used in the underlying J13 reservoir shows reliable results for the J11 terrigenous reservoir. The obtained data reliably show the direction of permeability heterogeneity, taking into account the distribution of indicator fluid from injection wells to production ones. Also, the values obtained using the analysis of well logging are confirmed by tracer data.

Keywords

• permeability anisotropy
• anisotropy scale
• tracer studies
• spatial distribution method
• heterogeneity of filtration properties