FORMATIVE LAWS OF DEEP NATURAL GAS RESERVOIR IN DU-QIAO-BAI AREAS, DONGPU DEPRESSION OF BOHAI BAY BASIN

The three petroliferous structures,i.e.,Qiaokou Baimiao and Duzhai in Du-Qiao-Bai areas,Dongpu depression constitute an enrichment area of deep natural gas with a significant resources background. On the basis of detailed structural explanation and new insights into sedimeutary facies of reservoirs,the paper analyzes the deep oil/gas reservoirs in Du-Qiao-Bai areas,in terms of formative conditions and constraints of oil/gas reservoirs,progressively the laws of oil/gas reservoirs are derived. Duzhai area with a deep sag background and simple structure is a large lithologic gas-bearing zone;and structurally-lithologically controlled gas condensate reservoirs are developed in Qiaokou area;and Baimiao area is characterized by the development of lithologically-structurally controlled gas reservoirs with oil rings,whose reservoir formative conditions are rather complex.