地学前缘 ›› 2018, Vol. 25 ›› Issue (2): 246-253.DOI: 10.13745/j.esf.yx.2017-12-27

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鄂尔多斯盆地伊陕斜坡上的低幅度构造特征及成因探讨

王建民,张三   

  1. 西安石油大学 地球科学与工程学院, 陕西 西安 710065
  • 出版日期:2018-03-15 发布日期:2018-03-15
  • 作者简介:王建民(1962—),男,博士,教授,主要从事沉积、储层、油气成藏及开发地质等方面的教学与科研工作。E-mail:wangjm@xsyu.edu.cn
  • 基金资助:
    This work was carried out in the Yanwumao block of Zhidan oilfield in the Ordos Basin. Based on a wealth of drilling data, threedimensional modeling of largescale dense well pattern and multifactor composite analysis from both macro and micro perspective, the characteristics and genesis of low amplitude structures on the Yishaan slope in the Ordos Basin were explored. Results show that the lowamplitude structures developed widely; simple and inerratic macroscopic characteristics of the structures can be seen through microscale sparse well pattern, while more refined and complex microscopic characteristics are shown through largescale dense well pattern. Each macroscopic low amplitude structure consists of a series of microscopic structures bearing local trap; its tectonic axis direction is close to the EW direction, perpendicular to the direction of the regional sedimentary facies belt distribution, and not conform to the formation conditions of differential compaction structure. The tectonic stress field was the power source in developing the essential characteristics of low amplitude structures of directional extension, sidebyside fold combination, largescale development, regional distribution and inheritance evolution. The comprehensive effect of the Indosinian, Yanshan and Himalayan threeperiod stress field on the Yishan slope embodied a form of SN compressional stress and pressuretorsion impact, resulting in sedimentary cover so as to generate a series of nose folds that stretched nearly along the EW and arrayed regularly. At the same time, the adjustment of the subsequent two periods of the stress fields forced the macroscopically simple low amplitude structures of Indosinian, developed into a series of microscopically more complex and changeable low amplitude structures through inheritance evolution, therefore eventually formed the special low amplitude structural patterns which contain “both simple and complex” characteristics on the Yishan slope.

Sequence stratigraphy of the carbonate platform of the Upper Carboniferous Chuanshan Formation and relative sea level change control in the Lower Yangtze region: an example from outcrops in Jurong City, Jiangsu Province.

WANG Jianmin,ZHANG San   

  1. School of Earth Sciences and Engineering, Xian Shiyou University, Xian 710065, China
  • Online:2018-03-15 Published:2018-03-15
  • Supported by:
    Ordos Basin; Yishaan Slope; Yanwumao block; low amplitude structure; low amplitude structure characteristics; low amplitude structure genesis

摘要: 以志丹油田烟雾峁区块为例,依据大量钻井资料,采用密井网、大比例尺三维建模、宏观对比与局部解剖相结合以及多因素叠合分析的方法,探讨了鄂尔多斯盆地伊陕斜坡上的低幅度构造特征及其成因。研究结果表明:鄂尔多斯盆地伊陕斜坡上的低幅度构造广泛发育;稀井网小比例尺条件能较好地反映低幅度构造简单及规则的宏观特性;密井网大比例尺条件则能够精细刻画低幅度构造复杂多样的微观特征。每一支宏观低幅度构造都是由一系列局部具闭合圈闭的微观低幅度构造组合而成;构造轴向基本呈近EW方向,与区域沉积相带展布方向近乎垂直相交,不符合差异压实构造的成因条件;构造应力场作用是区内低幅度构造拥有定向性延伸、排列式褶合、规模化发育、区域性展布、继承性演化等基本特征的源动力。印支、燕山、喜山三期应力场对伊陕斜坡主体的综合作用体现为一种近SN向的挤压及压扭性应力效应,导致沉积盖层产生一系列近EW向伸展且规则排列的鼻状褶曲;同时,由于后两期应力场的调整和影响,使宏观尺度上较为简单明了的印支期低幅度构造在微观尺度上继承性演化,进一步分化为一系列形式更为多样的低幅度构造及其组合,造就了现今伊陕斜坡上“简单又复杂”的特殊低幅度构造格局。

关键词: 鄂尔多斯盆地, 伊陕斜坡, 烟雾峁区块, 低幅度构造, 低幅度构造特征, 低幅度构造成因

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