Reestablishment of Basin Framework on Member 2 of Kongdian Formation in Kongnan Area, Huanghua Depression

Key words: 
• Member 2 of Kongdian Formation /
• depressional basin /
• basin framework /
• geographical environment

Abstract: Member 2 of Kongdian Formation（Ek2） has been changed by lots of faults, such as Cangdong fault and Xuxi fault, etc. It greatly changed the original basin framework. Black mudstone and oil shale appeared on the uplift, while, stratum rich in gritstone detected in the Sunken area, as the most important characters, become difficult to research. Based on the equitime stratigraphic contrast, and a comprehensive analysis of the thickness, lithofacies, sediment facies, structure and sediment system of Member 2 of Kongdian Formation, conclusions have been made that the lack basin was depress basin, simultaneously, Kongdian uplift belt existed in the center of the basin now was the center of the lack basin and depocenter during the deposition of the Member 2. These conclusions are significant for clearing the basin evolution, its origin, petroleum and natural gas exploration.