低渗透砂岩裂缝参数与应力场关系理论模型

doi:10.7623/syxb201104015

石油学报 ›› 2011, Vol. 32 ›› Issue (4): 664-671.DOI: 10.7623/syxb201104015

低渗透砂岩裂缝参数与应力场关系理论模型

冯建伟 1 戴俊生 1 马占荣 2 张亚军 3 王志坤 3

1中国石油大学地球资源与信息学院山东青岛 266555； 2中国石油长庆油田勘探开发研究院陕西西安 710018； 3 中国石油西北地质研究所甘肃兰州 730000

收稿日期:2010-09-13 修回日期:2011-04-22 出版日期:2011-07-25 发布日期:2011-09-22
通讯作者: 冯建伟
作者简介:冯建伟，男，1979年4月生，2008年获得中国石油大学（华东）博士学位，现为中国石油大学（华东）教师，主要从事构造地质学研究方向。
基金资助:
国家科技重大专项(2008ZX05051)“渤海湾盆地东营凹陷勘探成熟区精细评价示范工程”资助。

The theoretical model between fracture parameters and stress field of low-permeability sandstones

FENG Jianwei 1 DAI Junsheng 1 MA Zhanrong 2 ZHANG Yajun 3 WANG Zhikun 3

Received:2010-09-13 Revised:2011-04-22 Online:2011-07-25 Published:2011-09-22

摘要/Abstract

摘要：

以低渗透砂岩为研究目标，借助于地质力学原理，从应力场和裂缝主要参数的关系入手，以裂缝开度、密度为桥梁，在适用性破裂准则优选的前提下，通过实验和理论推导的方法，建立应力—应变和裂缝开度、密度的力学模型，得到应力场能量和裂缝参数的一套定量化方法。结果表明：能量方法和破裂准则相结合是建立应力场和裂缝参数力学模型的有效途径，当岩石内部应力状态超过破裂条件后，裂缝密度、开度都随应变能密度的增加而增加；低渗透砂岩裂缝主要在古应力场下形成，其裂缝开度、密度都比现今应力场作用下大很多，现今应力场不利于裂缝的形成，裂缝开度可通过裂缝壁面上承受的正应力和剪应力计算得到。最后，以史南油田史深100块沙三中油藏低渗透砂岩为例，进行了古、今应力场的数值模拟和裂缝参数预测工作，并得到了良好的效果。

关键词: 低渗透砂岩, 裂缝开度, 裂缝密度, 构造应力场, 力学模型

Abstract:

Aiming at low-permeability sandstones, on the premise of reasonable preference of fracture criteria and based on the principle of geological mechanics, we established a mechanical model of the stress-strain field and parameters of fractures (aperture and density) by means of tests and theoretical derivation, and developed a set of quantitative methods using the relationship between fracture parameters and stress field. The results showed that the combination of an energy method with fracture criteria was an effective approach to establish the mechanical model of stress field and fracture parameters, when the inner stress state reached or exceeded failure conditions, the aperture and density of fractures would increase with the increase of strain energy density. At the same time, it was found that fractures in low-permeability sandstones formed commonly under paleo-stress field and their aperture and density were much larger than those under the current stress field. Consequently, it was concluded that the current stress field went against producing fractures and fracture aperture could be calculated through positive stress and shear stress acting on the fracture surface. Finally, a numerical simulation of current and paleo-stress fields and a prediction of fracture parameters were made on low-permeability sandstones from a reservoir of the middle third member of the Shahejie Formation in the Shinan oilfield and a good result was achieved.

Key words: low-permeability sandstone, fracture aperture, fracture density, structural stress field, mechanical model

冯建伟戴俊生马占荣张亚军王志坤. 低渗透砂岩裂缝参数与应力场关系理论模型[J]. 石油学报, 2011, 32(4): 664-671.

FENG Jianwei DAI Junsheng MA Zhanrong ZHANG Yajun WANG Zhikun. The theoretical model between fracture parameters and stress field of low-permeability sandstones[J]. Editorial office of ACTA PETROLEI SINICA, 2011, 32(4): 664-671.

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低渗透砂岩裂缝参数与应力场关系理论模型

The theoretical model between fracture parameters and stress field of low-permeability sandstones

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