Oil and gas potential and new exploration targets in Ferganskaya Dolina

Ferganskaya Dolina is an old oil province in Middle Asia,and now still highly prospective in spite of long-term exploration and development.New exploration targets include nonstructural(concealed) oil and gas pools,rolling exploration of the interior of the old oil fields and drilling of the deeper levels of the Mesozoic and Palaeozoic strata.The previous drlling targets were once concentrated to the anticline traps,and little has been done for the research and drilling in the non-anticline traps in this basin.The detailed study of the data on the drilling and producing test of the interior of the old oil fields shows that the lower walls of major thrust faults and flanks of anticlines in the old oil fields are expected to have more potential in oil and gas resources.The Palaeozoic and Mesozoic strata in the basin occur not only as reservoir rocks but also as source rocks,and thus are favourable for the oil and gas accumulation both in local uplifted and marginal areas of the basin.