宁镇和茅山地区被褶皱的断层及其与逆冲推覆构造的关系研究

FOLDED FAULT AND ITS RELATIONSHIP TO THE THRUSTED NAPPE STRUCTURE IN NINGZHENG AND MOUSHAN AREAS

黄钟瑾 沈修志 孙岩 杜定金

Huang Zhongjin Shen Xiuzhi Sun Yan Du Dingquan

南京大学

Nanjing University

本文通过对江苏省宁镇、茅山地区的几个实例,阐明沉积岩层断层被褶皱的形态特征、及识别标志,探讨其形成机制及其与逆冲推覆构造的关系。断层褶皱背斜的顶部脱空,与断层面相匹配,形成有利的储油气构造。可成为油气构造圈闭的新类型。

In this paper, several folded faults are analysed in Ningzheng and Moushan Areas, Jiangsu Province, and they can be classified into following types based on their configurations: anticlinal fault, synclinal fault and complex fault. All those faults were formed under the control of folding or continuosly folding with the mechanism of thrust-nappe structures. The principal markers of such faults are of the occurrence of nappe-outlier and nappe-inlier, abrupt turning of fault line, steep flanks at both sides of the fault with small angles at the top of anticlines. The decouples of the fault plane would easily be formed at the top of anticlinal fault during folding and the fault plane can be acted as sealing if oil/gas generation conditions are favourable. So that the top of the anti-clinal fault would be favourable for the preservation of oil/gas accumulation while the type of anticlinal fault can be a new type of oil/gas trap-structure.

https://doi.org/10.11781/sysydz198801024