Print this pageAbstract: Distribution of Hydrocarbon Resources in the Main Oil-Gas-Bearing Complex, Dnieper-Donets Depression
LAZARUK, YAROSLAV
The main oil-and-gas-bearing sequence of Lower Carboniferous contains about 75% of the oil and gas reserves. Their spatial distribution essentially depends on structural and lithologic factors. Carboniferous sandstones are the formations of alluvial plains, coastal plains and submarine fans.
With the sandstones of coastal plains are the largest hydrocarbon fields by reserves, and the reservoirs show lateral continuity. The pools are located in the thick persistent laterally sandstone beds with high filter-capacity properties. Practically all the largest hydrocarbon accumulations are located in anticlinal traps; the role of lithologic seals in their forming is small (Glynsk-Rozbyshivka field C1V1). The pools, which are connected with the sandstones of submarine fans, are also mainly anticlinal; the bed-reservoirs in them often have a tendency to show changes to clay rocks (Yablunivka field, C1T). The most complex structures have the traps connected with alluvial facies. They are lens-like, in plan view, with complicated configuration; not always are they connected with anticlinal highs (Southern Opanasivka field, C1S). The filter-capacity properties of sandstones are very changeable. Hydrocarbon reserves in these traps are, as a rule, not large.
As a whole, sandstones of coastal plains represent 52% of prospected hydrocarbon reserves of Lower Carboniferous and they show good lateral continuity; submarine fans, 43%; and alluvial plains, only 5%.
AAPG Search and Discovery Article #90942©1997 AAPG International Conference and Exhibition, Vienna, Austria