摘要
塔北隆起西段发育典型的三层构造层:古生界构造层发育寒武—奥陶系潜山;中生界构造层发育披覆背斜,由差异压实作用引起的小型正断层使披覆背斜成为断背斜;位于库木格列姆群(E1-2km)膏盐层之上的新生界构造层以滑脱褶皱和冲断层为特征。本文认为,该区的中生界勘探应当放弃构造勘探的模式,立足于岩性勘探和小型的披覆构造及断背斜勘探。在该区应正确识别地震剖面上因上覆膏盐层影响而造成的大量构造假象,并结合中生界沉积相、沉积微相研究及区域构造应力场、构造变形特征分析,寻找可靠的地层圈闭。
The typical three-layer structural layer has been developed in the west of Tabei uplift: Cambrian-Ordovician buried hill in Paleozoic structural layer; drape anticline in Mesozoic structural layer, minor-scale of normal fault caused by differential compaction made it to be faulted anticline; the slip fold and thrust are characteristics of Cenozoic structural layer above the E1-2km gypsolith layer. The paper considered that the exploration in Mesozoic of the region should give up the mode of structural exploration and make effort to carry out lithologic exploration and exploration of small-scaled drape structure and faulted anticline.It should correctly identify a great amount of false structural images resulted from the influence of overlain gypsolith layer on seismic sections and find out reliable stratigraphic traps in combination with the study of Mesozoic sedimentary facies and microfacies and analysis of regional structural stress field and deformation feature.
出处
《石油地球物理勘探》
EI
CSCD
北大核心
2007年第2期226-229,234,共5页
Oil Geophysical Prospecting
