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DOI:
地质力学学报:2014,20(2):149-158
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厚层河道砂体地应力分布影响因素分析
(1.中国石油大学(北京)地球科学学院, 北京 102249;2.中国石油大学油气资源与探测国家重点实验室, 北京 102249)
ANALYSIS OF INFLUENCING FACTORS FOR GROUND STRESS IN CHANNEL SANDSTONE
(1.College of Earth Sciences, China University of Petroleum, Beijing 102249, China;2.Key State Laboratory of Petroleum Resource and Prospecting at China Petroleum University, Beijing 102249, China)
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投稿时间:2014-02-24    
中文摘要: 相邻的沉积微相不仅地应力大小不同,地应力方向也存在较大差异。利用有限单元法,通过改变不同的边界条件(包括河道介质和周围岩体的弹性模量、泊松比,河道走向与区域主应力方向夹角及边界应力比),对河道砂体地应力的影响因素进行分析。模拟结果表明,相比于河道周围岩体和区域地应力特征,不同的边界条件对河道砂体地应力大小和方向的改变程度很大,其中河道砂体与周围岩体的弹性模量比、河道走向与区域主应力方向夹角及边界应力比是影响河道砂体现今地应力方向和大小的主要因素。研究结果可以为不同沉积微相下进行人工压裂和井网部署提供参考依据。
中文关键词: 地应力  河道砂体  有限元法  影响因素
Abstract:With the further geological exploration, it is showed that different values and directions of in-situ stress are appeared in the adjacent sedimentary facies by a mass of production test data. By changing different boundary conditions(including the elasticity modulus and Poisson's ratio of channel and surrounding rock, the inclined angle between channel direction and the orientation of the regional principal stress and boundary stress ratio), the influence factors of the geostress in the channel sandstone are analyzed in finite element method. It is showed that the stress values and directions of the channel sandstone change seriously under the influences of different boundary conditions, compared with the in-situ stress characteristics in the surrounding rocks and region. The influence factors on the present stress of the channel sandstone are mainly the elastic modular ratio of channel to the surrounding rocks, the inclined angle between channel direction and the orientation of the regional principal stress and boundary stress ratio. The result could provide references for artificial fracturing and well network deployment in different sedimentary microfacies.
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祖克威,曾联波,刘喜中,张俊辉,赵向原,刘国平.厚层河道砂体地应力分布影响因素分析[J].地质力学学报,2014,20(2):149-158DOI:
ZU Ke-wei,ZENG Lian-bo,LIU Xi-zhong,ZHANG Jun-hui,ZHAO Xiang-yuan,LIU Guo-ping.ANALYSIS OF INFLUENCING FACTORS FOR GROUND STRESS IN CHANNEL SANDSTONE[J].,2014,20(2):149-158DOI:

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