At present, hydrocarbon reserves in carbonate sediments are the source of growth and maintenance of oil production levels. Carbonate deposits development is characterized by high geological and technological risks of well drilling, related to poor reservoir properties and complex geological structure. Petroleum engineers making prompt decisions on drilling wells need express estimation tools that would help them rate geological and technological factors when identifying high-risk areas. The article discusses the use of an integral map of drilling risks for the Middle Carboniferous carbonate strata (reservoir С2ks-pd) of the Arlanskoe field. The reservoir С2ks-pd is defined by poor PVT characteristics, high lateral and areal heterogeneity, and void morpholoical variability. The development of the integral map of drilling risks was based on fuzzy logic methods, which allowsed finding unrevealed dependencies between successful drilling and different affecting factors. Preliminarily to form the list of geological and technological data, on which integral map development will be based. According to the obtained integral risk map, С2ks-pd reservoir was ranked into 4 categories based on desirability degree: high, moderate, low and critical. The approach proposed in the article allowed adjusting drilling targets for wells previously placed in areas with low and critical desirability and highlight dangerous areas to perform additional research for prevention negative results prevention.
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