Abstract:

The high conductivity of high conductive mudstone is mainly caused by sali-nity difference, and has less relation with the chemical composition and claymineral of mudstones.The deposition of the mudstone is not a simpleprocess of the lake enlargement, but a process of enlarging-contracting andreenlarg-recontracting.In the meantime, the depth of water and the nature ofmediums were changed correspondingly.This shows the control actions of ancientclimate and direct runoff under the stable structural background.