A system is an organic integer with a certain function

which consists of several factors to be related to and interacting on each other. Systematology is a science studying the common characteristics

nature

principle and regularity of objective reality system. Complying with systematology idea

reservoiring theory system has been studied to have different levels and structures. Petroleum system refers to the geological factors and geological processes which are necessary for oil and gas migration and accumulation. Various exploration stages

research aims and recognitions would have different requirements to theoretical system. Development of reservoiring theory should have be based on theory of petroleum system

be guided by theory of composite hydrocarbon accumulation zone

and reflect the evolution of reservoiring theory to be from materials description-mechanism analysis-regularity summarization. Presently

a further study of dynamic reservoiring processes need the reservoiring theory regarding the migration pathway system as key factor so as to predict effectively oil and gas reservoirs.