SZ油田开发中后期相控储层精细表征研究

SZ油田已进入开发中后期的高含水阶段,为进一步描述储层分布规律,以高分辨率层序地层学理论为基础,采用岩心、测井、地震资料和生产动态资料等方法,对SZ油田东营组下段的层序地层及基准面旋回界面、洪泛面的成因类型进行综合研究,建立了中短期旋回层序地层框架。在此基础上进行短期层序为单元的等时地层对比,同时划分单井沉积微相并描述小层单元内沉积微相特征。应用层序地层学和相控储层建模技术,建立能精细表征储层非均质特征的地质预测模型,并利用油藏数值模拟对油田压力、含水率进行历史拟合,拟合结果与油田实际生产数据吻合较好,表明利用层序地层学及相控地质建模技术可为油田中后期综合调整及挖潜提供可靠的地质依据。

Characterization of facies-constrained reservoir in mid-late life of the SZ oilfield development

The SZ oilfield has entered high water cut stage in its mid-late life of oilfield development. It is necessary to further describe reservoir distribution. This paper comprehensively studies the stratigraphy,base level cycle interface,flooding surface genesis of the lower member of Dongying formation in SZ oilfield by using core,logging,seismic and production performance data,and establishes a sequence stratigraphic framework of medium-short term cycles. Isochronous stratigraphic correlation is conducted for short-term sequences;meanwhile sedimentary microfacies are divided for single well and described for every subunit. A geological prediction model is built by applying sequence stratigraphy and facies-constrained technique to finely characterize reservoir heterogeneity,and history matching is conducted for reservoir pressure and water cut through numerical simulation. The result matches well with actual oilfield production data,manifesting that sequence stratigraphy and facies-constrained modeling technique can be used to provide reliable geological basis for integral adjustment and potential tapping in the mid-late life of oilfield development.