东营凹陷不同沉积层序的输导体系结构特征

针对东营凹陷的地质特征,利用输导体系综合研究方法,分析了盆地输导体系的构成,发现东营凹陷不同沉积层序在输导体系结构特征上存在差异性:①深部沉积层序(Ek-Es4)输导特征主要表现为砂体侧向复式输导.边缘带输导体系要素主要为砂体,且以侧向输导为主,在深部层序中属于主要输导体系.洼槽带输导体系要素单一,为断裂垂向单一输导,在深部层序中属于次要输导体系.②中浅部沉积层序(Es3-Ed)的砂体、断裂在盆地中都十分发育,输导体系类型多样,包括断裂-不整合型、砂体-断阶型、网毯式-断裂型、简单砂体-断裂型、阶梯型及不整合型输导体系,输导特征主要表现为砂体-断裂多向复式输导.③从深部沉积层序到中浅部沉积层序,输导方向变多,输导特征总体上由简单输导向复式输导逐渐变化.

Characteristics of the passage systems in different sequences in Dongying Depression

According to the geological characteristics of Dongying Depression,its hydrocarbon passage system is analyzed using the comprehensive study method of passage system.It is found that the passage systems of different sequences have difference:(1) The passage systems of deep depositional sequences(Ek-Es4)are characterized by the complex hydrocarbon conduction in the sides of sandbodies.In their marginal zone,the essential element of the passage systems is the lateral conduction of sand-bodies,which is also the main passage form in the deep depositional sequences.In their depression zone,the essential element of the passage systems is the vertical conduction of faults,which is the secondary passage form in the deep depositional sequences.(2) In medium-shallow depositional sequences(Es3-Ed),sand-bodies and faults are all very developed,and therefore the types of passage system are diverse,including fault-unconformity type,sand-body-fault-step type,net carpet-fault type,simple sand-body-fault type,ladder type and unconformity type passage systems.The passage systems of the medium-shallow depositional sequences are characterized by the complex hydrocarbon conduction of sand-body-fault.(3) From the deep depositional sequences to the medium-shallow depositional sequences,conducting direction varies continuously,and the conducting character varies from simple conduction to complex conduction.