前陆冲断带构造应力场与裂缝发育关系

宋勇; 冯建伟; 戴俊生; 刘旭; 卞保力; 李明

前陆冲断带构造应力场与裂缝发育关系

1.
中国石油新疆油田分公司勘探开发研究院，新疆克拉玛依 834000
2.
中国石油大学 (华东) 地球资源与信息学院，山东东营 257061
3.
中国石油辽河油田公司勘探开发研究院海洋所南海室，辽宁盘锦 124010

基金项目:

国家科技重大专项 2008ZX05001

详细信息

作者简介:
宋勇(1978-), 男, 汉族, 工程师, 主要从事地震资料解释和石油地质研究。E-mail:UPC_fengjw@yahoo.com.cn

中图分类号: TE122.2
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出版历程
- 收稿日期: 2010-03-09
- 刊出日期: 2010-09-01

RELATIONSHIP BETWEEN STRUCTURAL STRESS FIELD AND DEVELOPMENT OF FRACTURES IN FORELAND THRUST BELT

1.
Scientific Research Institute of Petroleum Exploration and Development, PetroChina Karmy Oilfield Company, Karamy 834000, China
2.
Faculty of Geo-Resource and Information, China University of Petroleum (East China), Qingdao 255666, China
3.
Exploration and Development Research Institute, PetroChina Liaohe Oilfield Company, Panjin 124010, China

摘要

摘要: 针对前陆冲断带地层裂缝预测难的现状, 在选择适合于研究区破裂准则的基础上, 确立了造缝时期古地应力和现今地应力与裂缝参数之间的关系; 通过构造特征研究确定了造缝时期古地应力的性质和方向, 用断层和裂缝走向统计法、声速法、水力压裂法和声发射法计算了现今地应力的方向和大小; 将古、今地应力场的数值模拟结果代入到裂缝参数计算模型中, 计算出了乌夏前陆冲断带二叠系火山岩-沉积岩混杂地层裂缝的开度、密度、孔隙度和渗透率, 并分析了分布趋势。研究表明, 构造应力和岩性对裂缝发育起决定性作用, 构造应力差异大的地区容易产生裂缝, 且裂缝各项参数较大; 靠近主断层的构造高部位裂缝发育程度较高; 凝灰质和泥质含量越大, 粒度越细, 裂缝越发育。
- 乌夏前陆冲断带 /
- 混杂地层 /
- 破裂准则 /
- 应力场 /
- 裂缝参数
Abstract: Aiming at the difficulties in predicting the fractures in strata in thrust belt, by selecting the fracture criteria suitable for the Wuxia foreland thrust belts under study, this paper has defined a relation of mechanical parameters with the current stress field and the paleostress field during the formation of the fractures, Based on the study on the Permian reservoir fracture, we have finished a quantitative calculation for fracture aperture and other parameters and drawn a map of distribution of each formation.The results show that structural stress and lithology paly a crucial part in development of the fractures; generally the fractures with greater fractural parameters are relatively easy to form in the areas with evidently different structural stresses; and near the high part of principal faults more fractures are developed, and the strata are more tuffaceous and argillaceous, fine-grained, with more fractures developed.
- Wuxia foreland thrust belt /
- strata of sedimentation and volcanic /
- fracture criteria /
- stress field /
- fracture parameters

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图 1 乌夏前陆冲断带地质简况

Figure 1. Geological skeleton of Wuxia foreland thrust belt

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图 2 乌夏前陆冲断带二叠系沉积充填序列及构造层序划分

Figure 2. Filling series and division of structural sequence of the Permian in Wuxia foreland thrust belt

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图 3 风城组古应力场最大主应力分布图(负值代表挤压)

Figure 3. Distribution of maximum principal paleostress of Fengcheng Formation (negative representing compressing)

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图 4 风城组古应力场最小主应力分布图(负值代表挤压)

Figure 4. Distribution of minimum principal paleostress of the Fengcheng Formation

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图 5 风城组现今应力场最大主应力分布图(负值代表挤压)

Figure 5. Distribution of maximum principal current stress of the Fengcheng Formation

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图 6 风城组现今应力场最小主应力分布图(负值代表挤压)

Figure 6. Distribution of minimum principal current stress of the Fengcheng Formation

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图 7 二叠系风城组现今裂缝线密度分布图

Figure 7. Distribution of current fracture linear density of the Fengcheng Formation

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图 8 二叠系风城组现今裂缝开度分布图

Figure 8. Distribution of current fracture aperture of the Fengcheng Formation

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图 9 二叠系风城组组断裂与现今裂缝孔隙度分布图

Figure 9. Distribution of porosities of current fractures and those of Fengcheng Formation

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图 10 二叠系风城组组现今裂缝东西方向渗透率分图

Figure 10. E-W distribution of current fracture permeability of Fengcheng Formation

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图 11 二叠系风城组现今裂缝垂向方向渗透率分布图

Figure 11. Vertical distribution of current fracture permeability of Fengcheng Formation

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表 1 乌夏前陆冲断带二叠系力学参数

Table 1. Mechanical parameters of Permian of Wuxia foreland thrust belt

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