Secondary Vugs of Carbonate Rocks: the Role and Methods of Study

There are considered problems of revealing reservoirs while using classical deterministic approaches. In the article there was introduced an example of dissonance of permeability received by dynamic well testing and well logging data and core laboratory research data. We suggest a hypothesis concerning the presence of the tight filtering channels. There were presented the examples of the results of the core computer x-ray tomography. According to the results of the core x-ray tomography there was executed the cavernous voids classification. There was showed the importance of the oriented selection of the core samples for the cavernous voids filtrational characteristics examination. In the article there were performed the results of the reservoir porosity and permeability and filtrational experiments, besides, those results were compared with the results of examinations of the non-oriented samples. It was showed that the oriented samples permeability was significantly higher and water and oil saturation lower than the values reported earlier. There were considered the difficulties of the well launching according to the well logging data interpretation because of the rocks high variability.