东辛油田地震勘探历程——一个复杂断块构造的三维地震解释实例

东辛油田是一个典型的断块复杂构造。在这个油田上,地震精查的方法在搞清断裂系统方面,取得了较好的成效。本文简述了在该油田早期所采用的一套三维地震解释（立体归位）方法,其中有些方法对当前搞三维地震勘探,及断层面的地质解释方面都还有着参考价值。近年来,又用数字地震方法,在此浅层的复杂构造的下面,发现了比较简单的深层构造,在几张附图中展示了深浅层构造之间的关系。

A CASE HISTORY OF SEISMIC SURVEY ON DONG-XING OIL FIELD -A PEACTICAL EXAMPLE OF 3-D SEISMIC INTERPRETATION ON A COMPLEX FAULT BLOCK STRUCTURE

Dong-Xing Oil Field is a typical complex structure cut by many faults. In this oil field, a precise seismic survey proved to be quite effective. Some techniques of early 3-D seismic interpretation （stereo-migration） are described in this paper. Essen-tially they are;1) A strict three-dimensional network of profiles.2) The recognition and the utilization of some abnormal events.3) The closure check of fault planes.4) The determination of spatial position of every reflection event by the △ti diagram.5) The 3-D migration by direct correlation, i.e., laterally rearranging all the reflection events from a series of 2-D migrated depth sections for forming a new series of 3-D migrated depth sections.These techniques are valuable to the 3-D seismic prospecting and to the geological interpretation of fault planes.In recent years, a simpler structure was found below this complex shallow struc-ture, by use of the digital seismic data. Several figures are presented showing the typical geological relationship between the shallow structure and the deep one.