收稿日期: 2005-06-02
修回日期: 2005-06-19
网络出版日期: 2005-08-20
基金资助
国家自然科学基金项目(编号：40172072，40472074)；国家重点基础研究发展规划项目(编号：2001CB209133)联合资助.
THE ANALYSIS OF MECHANICAL AND CHEMICAL FACTORSMAKING THE DIFFERENCE OF FAULT′S ACTION
阐述了决定断裂封闭性能的力学和化学因素。力学因素包括岩石破裂性质、断面正应力和断裂变形机制,其影响规律为:1岩石破裂性质和断面正应力决定了断裂的开敞程度;2三维应力实验已证实随温压升高,变形程度加深,而孔隙度和渗透率递减,但低压脆性变形中存在膨胀扩容阶段,并且膨胀扩容程度随有效应力增加而减小。化学因素包括化学沉淀作用、压溶作用和元素迁移,其影响规律为:1化学沉淀作用在开启性断裂中发育;2随温压的升高,压溶发育增强,随含水量的增加,压溶发育减弱;3形成断层岩的变形变质过程中,发生较大规模的体积损耗和元素迁移,大部分体积损耗是压溶-迁出作用造成的。认为在不同力学性质的断裂中,各因素对其封闭能力的影响程度不同。假设各种力学性质的断裂形成于同一构造应力场,并发育在同一力学强度的岩层或岩体中,则压性断裂相对高温、高压,其裂隙和断面紧闭程度高、变形程度深、压溶作用发育,压性断裂带为封闭系统,主要发生还原作用和脱水作用;张性断裂相对低温、低压,其裂隙和断面开启、压溶作用不发育、化学沉淀作用强,张性断裂带为开放系统,主要发生氧化作用和水解作用;扭性断裂的裂隙和断面张开度介于压性和张性断层之间,断裂核部因剪切热而压溶发育、变形...
李振生;刘德良;刘波;杨强; . 断裂性能差异的力学和化学因素分析[J]. 天然气地球科学, 2005 , 16(4) : 485 -491 . DOI: 10.11764/j.issn.1672-1926.2005.04.485
Mechanical and chemical factors, which influence fault′s action to fluid, are detailed discussed in this paper. The mechanical factors include mechanical property of fractures, normal stress of fault plane and deformation mechanism of faults, and their actions are as follows: ①The open degree of fault is determined by mechanical property of fractures and normal stress of fault plane; ②It has been testified by tri-axial compression experiments that the higher temperature and pressure, the deeper the deformat...
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