Primary research on lateral accretion with horizontal well core samples;

Based on the study for petrology and geochemistry of sedimentary interbeds such as sandstone, mudstone, silicalite and carbonate rock in volcanic lava, we have considered that Xiong er Group was formed in the tectonic setting of passive continental margin; its paleogeographic environment mainly was conti.

Strength characteristics with genesis and type of the sedimentary weak intercalated layers;