双河南块核三段Ⅲ油组隔夹层识别及特征研究

Identification and characterization study of interlayers in coreⅢoil formation of Shuanghe south block

双河油田南块油藏内部发育不同类型的隔夹层,影响油水运动及后期剩余油开采。为了进一步提高开发效率,对双河南块核三段Ⅲ油组隔夹层进行了识别并研究了隔夹层分布特征。通过测井曲线特征、交会图法及Fisher判别分析法对隔夹层进行识别,依据识别结果,绘制联井剖面图与平面图,得出隔夹层分布特征。结果表明,研究区发育泥质、物性、钙质3种隔夹层;泥质隔夹层分布广泛,多分布于主河道、河侧及远端河道砂体分叉处和边缘地区,以及分流河道间湾等水动力条件弱、距物源远的地区;钙质隔夹层分布于断层附近及水动力强的近物源区;物性隔夹层发育较少且分布零散。研究可为后期剩余油开发与挖潜提供依据。

Different types of interlayers developed in the south block reservoir of Shuanghe Oilfield affect the movement of oil and water and the later recovery of residual oil,in order to further improve the development efficiency.The interlayers in coreⅢoil formation of Shuanghe south block were identified and the distribution characteristics of the interlayers were studied.Through logging characteristics,crossplot and Fisher discriminant analysis method,the interlayer was identified.According to the identification results,the well profile and plan were drawn,and the distribution characteristics of interlayers were obtained.The results showed that three types of silty,physical properties,and calcium were developed in the study area.The silty interlayers are widely distributed in the bifurcation and marginal areas of the sand bodies of the main channel,the river side and the remote channel,as well as the areas with weak hydrodynamic conditions and far from the source of the material.Calcareous interlayers are distributed near faults and near source areas with strong hydrodynamics.Physical interlayers are less developed and scattered.This study provides a basis for the remaining oil development and potential exploitation in the later period.