Due to the curve of the stone floor. Make a curved shape upside down, or hump khlaikratha. Oil and natural gas are moved together in an arc above the bottom pan with stones texture off.
Due to the curvature of the stone floor. The curved shape resembles an inverted wok or cambered. Oil and natural gas will flow together into the arc in the bottom of the pan. The rock texture is covered.
Caused by the curve of rock. The curved shape like Pan upside down or bump. Oil and gas will move in gathered in the arc bottom pans on top. The rock texture cover.