济阳坳陷青城凸起成藏模式及勘探方向

Reservoir occurrence model and exploration objectives in Qingcheng uplift of Jiyang Depression

济阳坳陷青城凸起地质条件复杂,油藏类型多样,油气分布复杂,勘探难度较大。虽然历经40多年的勘探,但近几年仍有较大发现。在对青城凸起构造演化、地层特征、圈闭类型和油气运移综合研究的基础上,确定油藏类型及油气空间分布特征,并对不同油藏类型提出针对性的勘探方法和勘探方向,取得了显著效果。研究认为,地层不整合油藏主要分布在北部斜坡带,油气受地层剥蚀线控制;地层超覆油藏主要分布在南部凸起区,上超砂体与不整合面相配套或超覆线与构造线相交控制油气分布;断块油藏受断裂系统控制成藏,在全区分布;潜山油藏沿高青大断层走向分布。

The geological condition is very complex in Qingcheng uplift with many kinds of reservoirs.Thus,the exploration is very difficult due to the complexity of oil and gas distribution.Although the exploration history is more 40 years,the new discovery is still promising in recent years.Based on the comprehensive study of the structure evolution.characterization of formation,and the a-nalysis of trap types and the migration of oil and gas.the type of reservoir and the characteristics of hydrocarbon spatial distribu-tion have been determined herein.Subsequently,the exploration methods and objectives have been launched for different types of reservoirs.The study presents that the stratigraphic unconformity reservoir is distributed in the northern slope belt which is con-trolled by the denudation line of formation with oil and gas,the stratigraphic onlap hydrocarbon reservoirs is distributed in the southern uplift districts controlled by the combination of overlying sands and unconformities or the intersection of onlap and structure lines.all-region distribution fault-block reservoir controlled by fault systems and the buried-hill reservoirs are distribu-ted along Gaoqing big fault.Based on(he study above,the exploration on stratigraphic unconformity reservoir has developed in Qingcheng uplift and the new blocks have been found with high production,moreover.it is a breakthrough of exploration on bur-ied-hill reservoirs.