Abstract:

The distribution of discovered oil and gas pools in Dongying fault-subsided Basin is controlled by regional caprocks. The caprocks are: mudstones of the first member of the Shahejie Formation in intra-part of the basin, the shallower buried mudstones of the Guantao Formation in the west part and wide spread igneous rocks in the south part. The organic coordination of caprocks in the three different horizons has successfully protected oil and gas from escaping,made the basin the richest one among all hydrocarbon-bearing basins within the Bohai Bay petroliferous province and controlled the distribution regularity of oil and Ras pools.