Based on observation of microscopic feature and statistical analysis of reservoir porosity and permeability characteristics,it is pointed out that gypseous-salt rock in the fourth member of Shahejie Formation influenced the diagenesis of glutenite body and resulted in larger difference between diagenesis feature a-bove and under gypseous-salt rock.

By correlating with Zhaolanzhuang area and combi ning with thermal analog test, it is demonstrated that the Cenozoic H2S gas in Luojia Area is the product of thermal chemical reduction action of the gypsum b ed in S4 interval, H2S gas produced in the gypsum bed migrated upward throug h the paths such as faults, fractures, magma active.

Geological features and mud logging technology for gypsum and salt rock formation;