论文部分内容阅读
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。
After the filling of oil and gas, due to the mechanical compaction and cementation, the physical properties of the reservoir deteriorate. Therefore, the reservoir characteristics of low porosity and permeability reservoirs do not reflect the characteristics of reservoirs during hydrocarbon accumulation. However, the conventional reservoir evaluation is mainly based on the current static evaluation, and does not take into account the reservoir evolution and reservoir forming conditions after the reservoir was formed. Therefore, the hydrocarbon-bearing property of the reservoir can not be well explained. In view of this, this paper presents a new idea applicable to the dynamic evaluation of low porosity and permeability reservoirs in the oil and gas exploration stage. Based on the recovery of reservoir properties during the hydrocarbon accumulation period, the reservoir criticality properties are taken as the effective reservoirs for the division of oil and gas reservoirs and ineffective Reservoir boundaries, the reservoir is divided into effective and invalid reservoirs: invalid reservoirs, regardless of most of the charging power, oil and gas can not be filled; effective reservoir of oil and gas is also controlled by the charging power. The interpretation map of critical accumulation quantitatively reflects the coupling relationship between reservoir physical properties and critical injection pressure. According to the kinetic equilibrium principle of reservoir formation, this paper explains the oil content of reservoirs in the Chang 6 member of Ansai area by using the interpretation map of critical accumulation. The method of dynamic reservoir evaluation is of great significance to the exploration of tight oil reservoirs.