Surgil ESIA Report - Volume III - EKN

“O’ZLITINEFTGAZ” PC
PFS “Surgil field complex costruction with valuable
components retrieval”
Palaeocene section - P 1 . The palaeocene deposits are presented in the bottom part by
greenish-grey clay limestone, and in top by brownish marls with the numerous residues of
inoserams, shells of urchins, fish scales and concretions of pyrite. Thickness of the
palaeocene deposits is 10m.
Eocene section - P 2. The deposits are presented by greenish-grey, and in the top part
of the cross-section – by brownish-grey marls, dense, strong with the fauna residues,
phytodetritus and fine-air pyrite. There are interlayers of writing chalk among marls.
Oligocene section - P 3 . The cross-section of Oligocene age is composed of clays of
the sea genesis, bedded conformability on the Eocene deposits. The clays are greenish-grey,
marly in the bottom part of the cross-section with the fauna residues and fish scales, with
inclusions of fine-air pyrite; the clays are green in the top part with tints of blue with
interlayers of siltstones, sands and mudstones, with concretions of pyrite. The clay of
Oligocene are low- permeable (1.5-2.0m/darcy), values of porosity reach 25%.
The start of sediment accumulation was marked by extensive transgression of the sea.
The same conditions, with short-term uplift of separate parts of territory, remained at
accumulation of the Eocene deposits. The high sea regime was stabilized in Oligocene time.
Thickness of the Palaeogene deposits is 548-632m.
Quarternary system-Q.
The Neogene deposits are absent and rocks of quarternary age with washout are
bedded on the chalk and Palaeogene deposits of different ages.
The quarternary deposits are presented by brownish-yellow, quartz-feldspar sands
and loose sandstones, siltstones and grey loams. The sediment accumulation of the
quarternary deposits occurred in alluvial-lake facial conditions with short-term
transgressions of the sea. Thickness of the quarternary deposits fluctuates within 60-186m.
Volume 2. Part 1. EIS Project for Surgil field construction
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