During the deposition of Qianjiang-Jinghezhen formations

Qianjiang salt lake tectonically experienced three evolution phases

i.e.

downfaulting

downwarping

and uplifting-erosion-finalization

each with different paleostructural features.Controlled by the paleostructural features

sources

paleoclimates

and water bodies

(fan)deltaic and salt lake depositional systems

as well as four patterns of salt-lake sedimentary fill(fault slope zones

slope break zones

salt lake density flows and southern ramp gypsic salt)

were developed in Qianjiang depression during the deposition of the Qianjiang Formation.In Qiangjiang depression

the paleostructural features of the Qianjiang depression Formation control the patterns of depositional fill;the present tectonic setting controls the hydrocarbon reservoiring;the water media condition have an influence on the extension and distribution of the sandbodies

and the genetic types of sandbodies control the types and sizes of the oil reservoirs.The central part of the depression is favorable for exploration of structural-lithologic reservoirs;the eastern slope zone is favorable for prospecting regional updip pinchout lithologic reservoirs;and the peripheral area of the synclines is favorable for explorations of local updip pinchout lithologic reservoirs.