老油田储层物性参数变化规律研究

VARIATION LAW OF PARAMETERS OF RESERVOIR PHYSICAL PROPERTY IN OLD OILFIELD

以小集油田为例,研究了老油田注水前后,储层孔渗参数变化的不同特征与剩余油的合理开采的关系。在比较小集油田水淹前后取芯井孔隙度与渗透率参数变化的基础上,提出其储层物性参数的空间变化特征有3种类型,即孔隙度与渗透率主频分布变窄型、孔隙度与渗透率向高值收敛增大型和孔隙度与渗透率数值均匀增大型;探讨了沉积韵律、含水特征与3种孔渗参数变化类型的相关关系;根据油田注水后,注入水的冲刷作用对孔渗变化的影响,讨论了油藏物性参数的时间变化特征。研究表明,确定不同的孔渗参数变化类型,并有针对性地设计注采方案,是合理挖潜剩余油的有效途径。

Old oilfield is taken as an example to study different variation characteristics of reservoir permeability and porosity parameters which are closed to rational exploitation of remaining oil around water injection in old oil fields.On the comparing of coring parametric variation around water injection,three types about the special variation on parameters of reservoir physical property are presented,i.e.,the main frequency gets narrower,the main frequency aggrandizement and constringency to its high value region,both of them aggrandizement evenly.The relationship among sedimentary rhythm,containing water characteristics and three types of reservoir parameter variations are discussed.According to the change of porosity and permeability,which is affected by practice of water injection,the temporal variation of parameters of reservoir physical property is discussed.The research shows that the effective ways of reasonable tapping the remaining oil potential are to determine different types of reservoir parameters and design pertinence scheme for injection and production.