LITHOSPHERE, 2003, No. 19, p. 61

Interdome uplifts of the turtleback type occur in synclines of intersalt and subsalt deposits and are rootless structures. These look like anticlines in supersalt Carboniferous, Lower Permian and Triassic, sometimes, Devonian deposits and flatten out upward and downward the sequence of supersalt deposits. There are no salt massifs in their cores, however, a thickness of the supersalt complex lower part which was deposited in primary compensation synclines is greatly increased. A thickness of the upper part of a supersalt complex of Triassic and, sometimes, Lower Permian deposits is increased considerably on their limbs in the secondary compensation synclines leant against salt massifs of surrounding cryptodiapirs. Their formation started in the Carboniferous and was mainly completed in the Permian and Triassic.

These structures show no promise for oil and gas presence, as supersalt deposits did not subsided into the major oil and gas generation zone, and there were no conditions favourable for the vertical migration from underlying deposits to the uplifts, as supersalt deposits are screened by thick clayey-halite substrata. Besides, intersalt deposits in the central part of the trough, where interdome uplifts are widespread, do not contain commercial oil pools, as there were no conditions favourable for the hydrocarbon generation, emigration and migration for long distances, since these were poorly heated and generated an immature viscous oil, are composed of depression clays and do not have oil reservoirs.

---