The article analyzed the background for oil and gas accumulation in Es4 sub-salt reservoir by the tests of geochemistry targets and organic inclusion homogenization temperature,combined with the study of the reservoir capability controls of sedimentary facies,diagenetic facies and high-pressure sealed boxes.

Features and Exploration Trends of Hydrocarbon Accumulation Assemblage of the subsalt strata in Marginal Caspian Basin of Kazakhstan;

Prediction for under-salt reservoir of Ordovician in East Ordos basin;

Impact of gypsum layer on seismic reflection feature of subsalt layer in Tahe area.;

Hydrocarbon resources in the pre-salt is very rich,and eighty-five percent of oil and gas proven reserves is distributed in the presalt in PreCaspian Basin.

Accordingly,the filled stratigraphy including the pre-salt sequence,the intra-salt sequence and the post-salt seq.

New formula of drilling mud density of the control wellbore closed rate in salt bed.;

Application of ternary copolymer salt-resisting fluid loss reducer in salt bed of Carboniferous system in Tahe oilfield.;

The components of amphoteric polymer salt tolerance mud have been introduced, and the field operation technology drilling through thick salt bed by using amphoteric polymer mud system has been summarized.