Conditions of oil and gas preservation in S_(2,3) oil layer in west slope region;

Oil and gas migration property and its function on reservoir forming of S_(2+3) oil layers in west slope region.;

According to characteristics of gas carbon isotope,there must be a great deal of oil-type gas in west slope region,which is distributed in Taikang uplift zone.

The source, accumulation and trap conditions in maturing zone are superior, but relationship between the structure and reservoir in maturing zone is complex, therefore, the ideas and work flow of lithologic exploration in slope area should be adopted for exploration in maturing zone.

Main oil-gas migration pathways of S_(2-3) oil layer in western slope zone and their effect on oil-gas accumulation;

Main controlling factors of gas origin and gas accumulation in western slope zone;

Sectional and micro anatomical study on clival region;

Objective: By providing detailed and relative anatomical date for clival region approach , to raise the removal degre e and improve the post operative result of the petroclival meningioma .

Objective Surgical access to lesions of petroclival region represents a challenge , both because of the depth of the lesion site and the vicinity of complex neurovascular structures.

Objective Surgical access to lesions of petroclival region represents a challenge, both because of the depth of the lesion site and the vicinity of complex neurovascular structures.