石油与天然气地质 ›› 1983, Vol. 4 ›› Issue (2): 181-191.doi: 10.11743/ogg19830206

• 论文 • 上一篇    下一篇

冀鲁帚状构造体系应力场的初步数学模拟

刘泽容1, 楚泽涵1, 王孝陵2   

  1. 1. 华东石油学院勘探系;
    2. 北京石油勘探开发科学研究院
  • 收稿日期:1982-05-13 出版日期:1983-06-25 发布日期:2012-01-16

PRELIMINARY MATHEMATICAL SIMULATON OF HEBEI-SHANDONG BRUSH-STRUCTURAL STRESS FIELD

Liu Zerong1, Chu Zehan1, Wang Xiaoling2   

  1. 1. Exploration Department, Huadong College of Petroleum;
    2. Beijing Institutc of Petroleum Exploration and Development
  • Received:1982-05-13 Online:1983-06-25 Published:2012-01-16

PDF (PC)

332

被引次数

52

摘要：

帚状构造体系是地壳上广泛存在的一种构造型式,在不均匀的旋扭应力场中成生,对其展布范围内的地质构造特征、成生发育历史都有特定的控制作用。对于帚状构造,目前从鉴定其存在、认识其成生发育史,应力作用方式及其控矿作用的角度研究较多,而研究其应力场较少。冀鲁帚状构造是我国东部的巨型控油帚状构造,其展布地区(冀鲁地区)已探明油气地质储量在全国总储量中占有相当大的比重。本文试图以对该体系已有的研究成果为基础,用弹性平面有限元法进行其应力场的数学模拟,以利认识该体系应力场特征、变化趋势及其控油作用,并探索帚状构造应力场的研究方法。

Abstract:

The problem how to apply a finite element method of elastic plane to simulate the stress field of Hebei-Shandong brush structure is discussed here. The structure,formed in Late Mesozoic,is a gigantic tectonic system seated in the second subsidence belt of Neocathaysian system,with its pillar of stress being western Shandong uplift,and the rock slice between two rotation surfaces being Hebei-Shandong subsiding area. The tectonic system is resulted from the relative shear movement of the pillar and the rock slice said above,both pushed by famous Tancheng-Lujiang fault belt in the east.Ever since its formation,the system has controlled the geological structure as well as oil distribution in the region where it stretched to Have studied the history of structural evolution in this region,the authors consider that the system was formed under the effects of driving stress inside rotation layer. Two simulation programs related to the system were discribed,one is simplified regular boundary program,the other is actual boundary program. 17 simulations were carried out by methods of adjusting boundary conditions and elastic parameters The results of the stress field simulation show that loci of the driving stress was a brush-shape,the neighbourhood of the pillar (i. e. the inside rotation layer and the converging part) is the place where stress concentrated. It is also shown clearly that the simulating value of the driving stress decreases rapidly and exponentially along radial direction and from the convering part to the diverging part. The reduction amplidude of tensile stress is larger than that of compressive stress,and the stress value on uplift is higher than that of adjacent depression. The properties of the simulated stress field are basically agreed with the strain pattern of Tancheng-Lujiang brush structure,thus some of geological phenomena can be explained,whereas their disagreements show from the opposite side that Hebei-Shandong brush structure is really resulted from multistage tectonic stress fields of different modes.