STATISTICAL JUSTIFICATION OF THE CHOICE OF ATTRIBUTIVE PARAMETERS FOR FORECASTING PRE-JURASSIC RESERVOIRS ACCORDING TO SEISMIC DATA

Abstract

The relevance of the research is caused by the need to increase the degree of reliable assessment of the geological structure of complex reservoirs in the presence of a small set of geological and geophysical information, which is ambiguous in predicting and identifying geological objects. In recent decades, companies have widely used various classification algorithms in processing the entire complex of data to reduce the uncertainties of geological interpretation. One of the approaches is application of classification methods to a seismic signal, which divide the object under study into areas that are homogeneous by a number of signs, where geophysical well surveys and core studies are also used, which involves the integration of information. A comprehensive interpretation of seismic and borehole data allows predictingat a qualitative level lithofacies variability in local areas, which contributes to a more rational placement of production wells. The main aim of the research is to consider approaches to analyzing a reliable assessment and forecasting the facies structure when searching for promising objects for the most optimal location of exploration wells when planning drilling, taking into account constantly updated and renewed geological information about the formation. The object of the study is the Paleozoic basement deposits of the southeastern part of the West Siberian Plate, which represent rocks of various material composition, including carbonate differences. Methods include statistical analysis of seismic information and geological and geophysical data. The statistical analysis of the spatial change in the facies environment was performed, on the basis of which reliable zones of the presence of certain facies were identified. The proposed strategy for predicting the prospects of oil and gas potential of the Paleozoic sediments on the example of one of the fields in Western Siberia contributed to the identification of promising zones for future planning of well locations.

Keywords

• seismic facies analysis
• seismic facies map
• well logging
• acoustic impedance
• core laboratory studies
• paleozoic deposits