Before obtaining the license for geological studying South-Khoreyver area, many small structures were mapped based on seismic profiling. Several unsuccessful exploration wells were drilled, despite the fact of series oil discovery are surrounding the area. After obtaining a license, causes of unsuccessful drilling have been analyzed, geological conception to oil-gas perspectives rectification was performed for the area, high-priority geological objects pointed. Hydrocarbons perspectives relate to carbonates of Lower-Permian-Carboniferous, Upper Devonian and Silurian age. The oil traps in the Permian-Carboniferous sediments confine to biogerm generation. In addition the oil reservoirs presence can be attributed of this object’s absolute depth situation compared with an ancient paleo-rising, existed to the North. These conditions are typical for the north-western part of the area. Oil reservoirs in the Upper Devonian sediments formed in repeat-form formations over the Fransian-Famenian reefs, which mapped as atoll occupies the central and western parts of the area. The traps in Silurian sediments were formed in places where different capacity Silurian reservoirs go under the surface of the pre-Upper Fransian erosion, result is the forming of different types of traps: stratigraphical - when high-capacity Lower Silurian reservoirs go directly to the erosion surface, lithological - if an Upper Silurian false-covering formation is between Lower Silurian reservoir and pre-Upper Fransian erosion surface, tectonic – this case are on the Eastern part of the area where a complex system of faults are spreading. In the most promising West part of the area 3D seismic was performed, traps emplacements were clarified, allowing to prepare for drilling the whole chain of geological objects. The analysis contributed to increase the success rate of drilling and new oil-production object acquiring.
References
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