大芦湖油田构造裂缝组合模式及压裂裂缝的分布

Combination models of structural fissure and the distribution of fissure fractured in Daluhu oil field

系统地阐述了大芦湖油田储层构造裂缝组合特征 ,给出了 3种组合模式 ,分析了现今应力场作用下不同裂缝组合的连通性和压裂裂缝分布 .两组共轭剪裂缝组合模式的连通性差 ;三组裂缝组合模式的连通性稍好 ;而四组及四组以上裂缝组合模式的连通性最好 .构造裂缝在压裂时是否活动取决于地应力差、岩石抗张强度、裂缝面与最大主应力之间夹角 ,裂缝组合及其裂缝与最大主应力的相对方位决定了压裂裂缝的方位和裂缝带宽度 .

This paper explounds the combined characteristics of structural fissures of reservoir in Daluhu oil field, gives three combination models, analyses the continuity of fissure combination and the distribution of fissure fractured. Under the effect of modern stress field, the coutinuity of combination model from two group of conjugate shear fissures is bad, the continuity of combination model from three group of fissure is good, the continiuty of combination model from four group of fissures is the best. The open or seal of structural fissures can be determined by the stress differences, tensile strength of rock and the angle between plane of fissure and maximum principle stress. The relative position among fissure combinations, fissures and maximun principal stress determine the direction of fissure fractured and width of fissure zone.