Kenderlyk Fm

Period:

Carboniferous, Permian

Age Interval:

latest Carboniferous-earliest Permian

Province:
Zaisan (Zaysan) Basin - East, Zaisan (Zaysan) Basin - Central

Type Locality and Naming

Synonym: Kenerlyk Fm, Kenerlykskaya; C3kn

Lithology and Thickness

In borehole Sarybulak C-1, it is described as ca. 400 m of Fine-grained rocks prevailing – mainly calcareous and silicic, bituminiferous aleurolite (siltstone) and claystone. Sandstone and limestone are in subordinate volume. Reference hole has horizons with deep bitumen in the form of felicic crack filling and impregnation of porous sandstone.

In Well X-II, Primanrack Depression, it is " 400 m-thick, mainly composed of mudstones and siltstones. Sandstones are of subordinate importance. The lower and middle units of the formation contain multiple oil shale layers. Oil shows were observed at the depths of 3935–4143 m." and in Kenderlyk Trough (southern margin) it is " 160–520 m-thick, composed of sandstones, siltstones, mudstones and oil shales. Tuff and tuffaceous sandstones and mudstones are of subordinate importance. The formation is intruded by two diabase dikes. Each dike is 12 and 20 m thick and spans over 2 and 12 km, respectively." (Nurbekova et al., 2023)

Lithology Pattern:

Claystone

Relationships and Distribution

Lower contact

Overlies the Akansai Fm

Upper contact

Overlain by the Karaungur Fm

Regional extent

Originally throughout the entire basin; but later tectonics and erosion during uplifts implies that the main surface exposures of the Late Carboniferous-Permian succession is a 2-km-thick succession in the Kenderlyk Trough in the southern part o the Zaisan (Zaysan) basin (Nurbekova et al., 2023).

GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[83.93,48.26],[84.45,48.03],[84.98,47.95],[85.39,47.97],[85.51,47.51],[85.46,47.38],[85.22,47.33],[84.8,47.34],[84.32,47.42],[84.01,47.58],[83.87,47.54],[83.83,47.42],[83.99,47.29],[84.57,47.2],[84.65,47.05],[84.4,47.04],[84.02,47.13],[83.8,47.23],[83.53,47.36],[83.36,47.5],[83.16,47.41],[82.79,47.61],[82.38,47.83],[82.2,48.07],[82.3,48.19],[82.33,48.36],[82.44,48.4],[82.71,48.35],[82.84,48.41],[82.91,48.64],[83.19,48.7],[83.56,48.55],[83.93,48.26]]]]}}

Fossils

Age

latest Carboniferous-earliest Permian (Gzhelian-Asselian?)

Age Span:

Beginning stage:

Gzhelian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

303.68

Ending stage:

Asselian

Fraction up in the ending stage:

1.0

Ending date (Ma):

293.52

Depositional setting

"Based on sedimentary characteristics, the Kenderlyk Formation is considered to be shallow-marine, freshwater and/or brackish-lagoonal, or lacustrine" (Nurbekova et al., 2023).

Depositional pattern:

Additional Information

Sandstone and jointy aleurolite have heighted resistance (up to 300 micro-roentgen per hou) and porosity (up to 15.5%).

Compiler:

Information provided by Nariman Jamikeshev from Kazakh-language sources and from other publications (e.g., Nurbekova et al., 2023. High-quality source rocks in an unexplored basin: The upper Carboniferous-Permian succession in the Zaysan Basin (Kazakhstan). Internat. Jour. Coal Geology, 272, article 104264.