Lower Cretaceous Megionsky and Sortymsky Formations in Western Siberia: Features of Subsurface Geology
The detailed correlation of logs from the wells drilled both on the arched uplifts and in the troughs between them was carried out using the procedures of sequential paleoprofiling and transformation of thickness of separate rock members to a single thickness. As a result, it is found that formation of the Lower Cretaceous sequence (Megionsky and Sortymsky formations) occurred in accordance with two possible scenarios, namely: resulting from variable-speed downwarping and multispeed subsidence