三维断层组合

本文提出一种以三维断层组合为基础的构造解释方法,要求在符合地质理论、体现空间构图规律、满足地震勘探自身限制的条件下作断层闭合。通过断点的闭合、组合,确定断层的空间形态与交切关系,可以实现准确描述构造的目的。使用该方法研究断层的组合关系,首先要在剖面间作断点闭合,然后确定断点的组合关系,而不用在平面上组合断层。因此,这种方法能有效地减少断层组合过程中的多解性。三维断层闭合是一个反复循环修正的过程。断层闭合网格应由稀到密,首先确定主要断层的分布,然后再研究次级断层的分布。采用工作站解释断层也应遵循这种思路。

Three-dimensional fault drawing.

I present a structure interpretation based on three-dimensional fault draw- ing.It is required that fault closure must be based on geological theory,spacial plotting principle and restrictions in seismic exploration.Geological structure can be well ascertained by analysing the shapes and interrelation of the faults which have been drawn through reasonable fault point closure and fault point correlation.According to this method,the interrelation of fault points is deter- mined by first closing corresponding fault points in intersecting sections,then reasonably correlating the relevant fault points.Fault point correlation is not achieved in base map,so its correctness can be improved greatly. Three-dimensional fault closure is achieved by iteratively revising.The clo- sure grid should be densified gradually.The distribution of major fault system is determined prior to secondary faults.Fault interpretation by workstation also follows this procedure.