Analysis on the Pros and Cons Responding to Students Competency Disparity;

The first reason for that is the type of depositional organic matter and process of hydrocarbon generation;the second one is the differential gathering and gravitational differentiation.

The regular distribution of oil,gas and water due to gravitational differentiation tends to the fact that a gas reservoir forms in structural trap at higher part,while an oil reservoir in structural trap at lower part.

It is pointed out that different types of migration and accumulation pathways and the natural gas gravitational differentiation during the migration process are the fundamental reasons for the difference of CO2 content between the two gas pools.

Basing on the Systematic change of chemical compositions, rare earth elements,trace elements in mylonite series with S～C double-layered angles and stress differences of Hehe-Yindian right-lateral ductile shear zone in Xincheng-Huangpi fault zone, this article has carried out a thorough research on the dynamic differentiation of right-lateral ductile shea

In the process of the gravitative differentiation, the masses, of the earth and the energy of rotation grther in to the earth core at the same time.