长庆不同类型油藏地质特征及对油藏开发的影响

The Geologigal Characteristics of different Types Reservoir and Its Influence on reservoir in Changqing Oilfield

根据油藏地质特征,按照渗透率的大小,将已开发油藏划分为低渗透、特低渗透、超低渗透和致密油藏四种类型,进一步研究不同类型油藏的地质特征及其变化规律,分析这些地质特征对油藏开发的影响。结果表明从低渗-特低渗-超低渗-致密油储层岩石粒度变细,粉砂和泥质含量增高,岩屑含量和填隙物含量逐渐增加,水敏和速敏矿物含量增高,面孔率越来越低,排驱压力、中值压力越来越大,微观非均质程度越来越强,原始气油比逐渐增大,油藏整体水驱开发效果逐渐变差。

According to the geological characteristics and permeability, the developed reservoir is divided into low permeability, extra-low permeability, ultra-low permeability and dense reservoir four types. In the further, different types of reservoir geological characteristics and their change rule,the influence of the geological characteristics of reservoir development have been studied.Results show that from the low permeability to extra-low permeability to ultra-low permeability to dense oil reservoir, rock granularity increased, the content of silt and mud increases gradually , the content of cuttings and filler increases, water and velocity sensitive mineral increases, face rate become low more and more , expulsion and median pressure is more and more big, the microscopic heterogeneity degree is more and more strong,the original gas-oil ratio increases gradually,reservoir water flooding development effect gradually becomes poor.