埕北断坡区油气成藏组合特征及分布规律

根据生、储、盖的基本特征，埕北断坡区主要划分为下部组合（中生界及其以下地层储、盖组合）、中部组合（沙河街组及东营组储、盖组合）和上部组合（馆陶组及明化镇组储、盖组合）等3类油气成藏组合，以及由这3类油气成藏组合派生的下部-中部和中部-上部油气成藏组合。各个油气成藏组合具有不同的油气成藏特征。由于构造运动的影响，埕北断坡区由北向南地层、沉积产生差异，生、储、盖的发育也出现差异：导致下部及下部-中部油气成藏组合主要分布在邻近凹陷的地区，即第一、第二台阶区；中部油气成藏组合主要分布在第二、第三台阶区；而上部及中部-上部油气成藏组合则主要分布在第三台阶区、南部斜坡区。

Characteristics and Distribution Regularities of the Oil-Gas Reservoir-Forming Assemblages in the Chengbei Fault-Ramp

Based on the basic characteristics of the source,reservoir and cap rocks,three types of oil-gas reservoir-forming assemblages,called the lower,middle and upper assemblages respectively,as well as two derived,called the lower-middle and the middle-upper assemblages respectively,have been divided in the Chengbei fault-ramp.Different oil-gas reservoir-forming assemblages are of different cha-racteristics.Tectonic activities led to the difference of the strata and sedimentation and to the difference of the source,reservoir and cap rocks from north to south of the fault-ramp.So the lower and the lower-middle oil-gas reservoir-forming assemblages are mainly distributed at adjacent sag areas,i.e.,the first and the second step regions.The middle oil-gas reservoir-forming assemblage is mainly distributed in the second and the third step regions.However,the upper and the middle-upper oil-gas reservoir-forming assemblages are distributed in the third step region and in the southern slope area.