鄂尔多斯盆地安塞地区长6段低孔渗储层动态评价  

Dynamic evaluation for low-porosity and low-permeability reservoir of the Chang 6 member in the Ansai area,Ordos Basin

作　　者：刘静静[1] 刘震[1] 潘高峰[1] 黄艳辉[1] 

机构地区：[1]中国石油大学油气资源与探测国家重点实验室

出　　处：《地质科学》2014年第1期131-146,共16页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：国家科技重大专项"岩性地层油气藏成藏规律;关键技术及目标评价"(编号:2008ZX05001-003-03-2)资助

摘　　要：油气充注后,由于机械压实、胶结交代作用导致储层物性变差,因此,低孔渗储层现今的储层特征并不能反映成藏期的储层特征。而常规储层评价主要以现今静态评价为主,并未考虑到成藏后储层的演化过程及成藏条件,因此不能很好地解释储层的含油气性。鉴于此,本文提出了适用于油气勘探阶段的低孔渗储层动态评价的新思路,在成藏期储层物性恢复的基础上,将储层临界物性作为划分油气充注有效储层和无效储层的界限,把储层划分为有效储层与无效储层:无效储层无论大多的充注动力,油气也不能充注;有效储层的含油气性还受控于充注动力。临界成藏解释图版定量地反映了储层物性与临界注入压力之间的耦合关系。根据成藏动力学平衡原理,本文利用临界成藏解释图版很好地解释了安塞地区长6段储层的含油性。该储层动态评价方法对指导致密油储层勘探具有重要意义。For the reason that the mechanical hydrocarbon charging, lead to deterioration low-porosity and low-permeability reservoir hydrocarbon accumulating. Conventional compaction, cementation and metasomatism after of reservoir properties, the present characteristics of can not reflect the characteristics of reservoir when reservoir evaluation mainly assesses the static characteristics of reservoir, and does not consider the evolvement of reservoir and the conditionof hydrocarbon accumulation. Therefore, the evaluation method can not explain the hydrocarbon potential of the low porosity-permeability reservoirs very well. In view of this, the paper proposed a new idea for dynamic evaluation of low-porosity and low-permeability reservoir. Based on the recovery of reservoir properties when hydrocarbon accumulating, through the critical properties of reservoir, the reservoir when hydrocarbon charging can be divided into effective reservoir and invalid reservoir. Hydrocarbon can not be charged into the invalid reservoir, no matter how much the charging pressure is. And if hydrocarbon can be charged into the effective reservoir, it is controlled by the charging pressure. The hydrocarbon accumulation is controlled by the reservoir properties and the charging pressure, and the interpretation plate of critical accumulation can quantitatively reflect the relationship between the reservoir properties and critical injection pressure. According to the principle of dynamic equilibrium in the progress of hydrocarbon accumulation, through the interpretation plate, this paper explained the hydrocarbon potential of the low-porosity and low-permeability reservoir in Chang 6 member,Ansai Oilfield. The dynamic reservoir evaluation method has important significance in guiding the exploration of tight oil and gas reservoirs.

关 键 词：安塞地区 低孔渗储层 临界物性 储层动态评价 

分 类 号：P618.13[天文地球—矿床学]