摘要
露头观测可以帮助我们了解构造裂缝的分布特征,也可以直观分析其发育与其他构造的关系。通过扬子地块钱塘坳陷中、下泥盆统的两处实测剖面,对厚层-块状砂岩中构造裂缝的产状、性质和分形分布特征进行分析,发现研究区地层陡倾,褶皱变形强烈,砂岩中均发育大量的构造裂缝;主要构造裂缝是在局部应力场作用下发育的、并与地层面斜交的剪切裂缝,其发育受到地层面的限制;还发育少量与层面大致平行的裂缝,其延伸相对较长,将厚层切割为较薄的岩层。统计表明厚度较大的岩层中也发育了大量的构造裂缝,其分维数较大。这一认识为构造裂缝的地震解释及地震反演提供了重要的线索。
Outcrop analogue study can significantly improve the understanding of fracture distribution and the relationship between development of fractures and impact factors. In this paper, we mainly investigate the constraints of bed thickness （BT） on the fractal dimension （FD） of oblique structural fractures in Fuyang, Zhejiang province. The primary fracture sets are oblique relative to the bedding, although one nearly parallel set is also present. The parallel fractures cut thick strata into small pieces and form a dense net work of fractures in the thick Strata. The oblique fractures, which result from the local stress, are inferred to form during folding. In the literatures, it is often reported that the relationship between FD of extensional structural fractures and BT is linear. However, in the study area correlations between FD of shear structural fractures and BT are rather poorly linear. The fractal dimension is also very high in thick layers. The recognition of this region provides an important clue for seismic interpretation and seismic inversion.
出处
《大地构造与成矿学》
EI
CAS
CSCD
北大核心
2013年第3期384-392,共9页
Geotectonica et Metallogenia
基金
国家"十二五"重大科技专项(编号:2011ZX05003-002)
国家"十二五"重大科技专项(编号:2011ZX05009-001)
云南省应用基础研究计划项目(编号:2011FB025)
云南省级人培项目(编号:KKSY201321058)联合资助
关键词
地层厚度
构造裂缝
与层面斜交
分形几何学
分维数
bed thickness
structural fractures
oblique to bedding surface
fractal geometry
fractal dimension
