地震资料在断层封闭性评价中的应用与探讨

Evaluation of fault sealing from seismic data and its application.

通过对断裂带填充物中泥质含量的大小与其断层位移和被错断泥岩厚度之间关系的定量描述,发现根据断裂带填充物中泥质含量的大小可判断断层封闭性,并可根据实际地质情况建立由断裂带填充物中泥质含量的大小评价断层封闭性的标准。勘探程度较低地区的断层位移和被错断泥岩厚度可利用地震资料来求取,再利用断裂填充物中泥质含量的大小判断断层的封闭性。通过在盐城凹陷断层封闭性研究中的应用表明,该方法可以用来研究断层封闭性,且与实际地质资料相吻合。

From the quantitative characterization of the relation between mud content with fault displacement and faulted mudstone thickness,it is found that mud content in the infill of fracture belt is an indicator of fault-sealing property.It is possible to establish a practical standard for evaluating fault sealing from the mud content in the infill of fracture belt.In areas of low exploration degree,we can first extract fault displacement and faulted mudstone thickness from seismic data,and then evaluate fault sealing property according to mud content.This method has been applied to the study of sealing property in Yancheng depression.Satisfactory results have been yielded.