贝尔凹陷断层侧向封闭能力定量研究

Quantitative Research on Lateral Seal Ability of Faults in Beier Depression

通过建立断裂带页岩断层泥比率(SGR)与断裂侧向所能封闭油柱高度函数关系式的方法,开展了断层侧向封闭能力定量评价方法的探讨,并对贝尔凹陷断层侧向封闭能力进行定量研究。结果表明:断裂带SGR与其所能封闭油柱高度具有指数关系,断层侧向封闭能力取决于断面SGR的三维空间分布。利用贝301区块油藏数据所建立的断裂侧向封闭失效包络线函数式预测了呼和16圈闭油水界面为-1 025m,并得到钻井证实。贝尔凹陷断层侧向封闭能力总体上表现为:垂向上南屯组以上断层封闭性较强,平面上贝西南断层封闭性较强。

By establishing functional relation between shale gouge ratio（SGR） value of fault zone and the height of oil column laterally sealed by fault,the discussion on quantitative evaluation method of fault lateral seal ability is carried out and the lateral seal ability of faults in Beier depression is studied quantitatively.The results show that SGR value of fault zone has exponential relation with oil column height which is sealed by it,and fault lateral seal ability depends on 3-dimension distribution of SGR value of fault plane.By using the function formula of lateral seal-failure envelopes of faults established by data of reservoir in Bei 301 block,it is predicted that oil-water contact（OWC） of Huhe 16 trap is-1 025 m,which has been confirmed by drilling.Generally,the lateral seal abilities of faults in Beier depression show that seal ability above Nantun Formation is stronger vertically,and that in the southwest Beier depression is stronger in plane.