Abstract
Siliceous rocks occur extensively in sedimentary basins in the northern part of the Pacific Mobile Belt. The Okruzhnoye field consists of such rocks. Its main productive horizon is the Pilengskaya Formation, of Miocene age, ranging from 100 to 500 meters in thickness or more and consisting of thin interbedded pelitomorphic siliceous and clay-siliceous rock with a few thin intercalcations of tuff, sandstone, and aleurolite. The productive beds are covered by argillaceous rock and form a stratigraphic trap about 600 meters thick which is filled with oil almost to the spill point. In this paper, the geochemical composition and physical properties of this reservoir are detailed. (JMT)
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