CHARACTERISTICS OF POOL-FORMING DYNAMICS AND CONDUCTING SYSTEMS IN THE LOWER TERTIARY OF THE TONG-WANG FAULT BELT, THE SOUTH DONGYING SAG, THE BOHAIWAN BASIN

The Tong-Wang fault belt is located at the south slope of Dongying Sag, Jiyang Depression. The vertical characteristics of geotemperature and formation pressure system (T-P system) is shown as overpressure multiple T-P system:normal T-P system in the upper formations and overpressure T-P system in the lower formations. The Lower Tertiary in this area is covered by relatively stronger power environment. Structural and stratigraphic reservoirs in this area are mainly controlled by fluid potential, and are distributed at relatively weaker fluid potential place. Lithological reservoirs, not restricted by fluid potential, exist at both relatively weaker and higher fluid potential places. Sand bodies and faults are main (carrying) beds for lateral and vertical oil-and-gas migration, while unconformity is also important for oil-and-gas lateral migration. Ladder-like migration is the distinct characteristics of oil-and-gas migration in the study area.