摘要
文中详细分析了现有恢复古构造方法的工作原理以及影响恢复精度的因素,在此基础上提出了在平衡剖面控制下直接编制古构造等值线图的方法。研究认为:命名为"某段沉积前"的构造图,反映的并非某一时刻的地表形态,而是该段地层沉积后底界面的构造起伏,是整个时段内变形叠加的结果;地层倾斜、井斜、差异剥蚀、断层水平位移是影响古构造恢复精度的最主要因素,沉积压实影响相对较小,古水深影响最小,几乎可以忽略;平衡剖面控制法读取的厚度是在地层拉平、断层水平位移恢复的基础上进行的,同时兼顾了差异剥蚀、沉积压实的影响,可以准确标定古断层的位置,更能准确反映地质历史时期构造的三维形态。
This paper analyzes in detail the working principles, working process, insufficiency and influenee factors of paleostructure restoration accuracy and puts forward to the method of drawing paleostructure contour map under the control of balanced section. The study suggesls that the structure map ealled for ＂before deposition of one member＂ is the reflection of the structural rolling shape of botto,n surface after the member deposition and it is not one time＇s surface eonfigu ration. It is the superimposing result of all deformalions during the whole time. Dipping strata, well defleetion, difference denudation and horizontal shift of taults are the dominant influence factors of paleostructure restoration accuracy. The influence of sedimentary compaction is relatively small and the influence of paleo-bathymetry is the least which can be ignored. Thickness value can be read with the balanced section eontrol method based on stratum lapping, horizontal shift of fauhs restoration and the influence of difference denudation and compaction. It can exactly demarcate the location of paleofaults and more accurately express 3-D structural configuration in the period of geologic history.
出处
《断块油气田》
CAS
2013年第6期681-685,共5页
Fault-Block Oil & Gas Field
基金
"十二五"国家科技重大专项课题"东濮凹陷油气富集规律与增储领域"(2011ZX05006-004)
关键词
古构造恢复
地质意义
影响因素
平衡剖面控制法
restoration of paleostructure
geological significance
influence factor
balanced section control method
