摘要
对挠曲作用的形变响应和地震响应进行了分析,探讨了挠曲作用的构造单元、动力学背景和响应沉积层序等。分析结果表明,挠曲作用诱发的挠曲滑动主要发生在2种界面上,一是大的岩性界面,二是因挠曲作用而形成的挠曲滑动界面,从而形成了响应于挠曲构造活动的独特的地震特征。对刚性地层和塑性地层而言,挠曲作用会形成不同的响应:刚性岩层发生诸如层内断裂之类的脆性形变,并认为挠曲作用可为层内断裂的一种新成因;塑性岩层则以颈缩、塑性流动、蠕变、揉皱等形变为主。所有这些形变特征,组成了一个由裂隙、层内断裂、错滑面等组成的彼此连通的空间立体网络,为流体的流动、物化反应和水岩反应提供了一个便捷畅通的网络体系,该体系不同于通常意义上由断层、渗透砂体和不整合面组成的输导体系。
The deforming responses and seismic responses of the flexing were analyzed, and the tectonic units, dynamic context and the sedimentary sequences were studied. The results show that the flexural-slipping induced by flexing occurrs on li- thological interface and flexural-slipping interface formed by flexing. These two different genetic horizons exhibit unique seismic response. High-competent strata and ductile strata can exhibit different strain characteristics under the same flexural stress, the former is dominated with the brittle strain such as the fault and fracture, the latter correspond to necking, ductile flow, plastic creep, crumpling etc. All these characteristics strain constitute the cubic, large-scale, interconnected meshwork including intra-bed faults or fractures, opened fissures, slipping surface, and detached fissures. This meshwork make the fluid flow, physieo-chemical action, water-rock action more practical. The meshwork is quite different from the conventionally transport systems which consist of faults, permeable sandstone strata and unconformities.
出处
《中国石油大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2008年第5期22-27,共6页
Journal of China University of Petroleum(Edition of Natural Science)
基金
国家自然科学基金项目(40572067)
关键词
挠曲作用
挠曲作用带
扭弯挠曲带
形变
构造层序
输导体系
flexing
flexing zone
winding flexural zone
deformation
tectonic sequence
transport system
