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