Influence of the local source area on the deposition of Urnensko-Usanovsky zone upper-middle Jurassic sediments

Basement and middle-upper Jurassic deposits were studied on the basis of core data. Investigation of clay minerals was performed according to X-ray diffraction analysis and scanning electronic microscopy. Analysis of reservoir mineral composition was performed and principle of their distribution along the area was defined. Source area and depositional environments for middle-upper Jurassic deposits was defined according to well and seismic data.