普光地区嘉二段构造裂缝形成机理及预测

发布时间：2018-10-17 17:19

【摘要】：为了较为准确地预测碳酸盐岩中构造裂缝的发育程度,以普光地区嘉陵江组二段为例,利用野外露头剖面,岩心和薄片资料,对其裂缝发育特征开展研究;结合声发射和裂缝包裹体均一温度测试结果,对研究区裂缝的形成机理进行分析。在上述基础上,采用应力场数值模拟,对不同期次的裂缝进行预测。分析认为,构造裂缝主要形成于燕山运动晚期和喜马拉雅运动早期的北西—南东向挤压作用,以及喜马拉雅运动晚期的北东—南西向挤压作用;普光地区嘉二段剪破裂的发育程度大于张破裂,构造裂缝主要发育在断裂带附近、清溪场构造中西部地区、普光构造主体、大湾—毛坝构造北部、分水岭构造北部和铁山构造带。数值模拟计算的破裂率和单井裂缝发育强度较为一致,相关系数较高。
[Abstract]:In order to accurately predict the development degree of structural fractures in carbonate rocks, taking the second member of Jialingjiang formation in Puguang area as an example, the characteristics of fracture development are studied by using outcrop profile, core and sheet data in the field. Combined with the results of acoustic emission and homogeneous temperature measurement of fracture inclusions, the formation mechanism of fractures in the studied area was analyzed. On the basis of the above, the stress field numerical simulation is used to predict the cracks at different times. It is believed that the tectonic fractures were mainly formed in the late Yanshanian and early Himalayan movements, the NW-SE compressions, and the late Himalayan compressions in the NE-NW direction, and in the late Himalayan movement, the tectonic fractures were mainly formed in the late Yanshanian movement and the early Himalayan movement. In Puguang area, the shear fracture of the second stage of Jiaxian is more developed than that of the tensional fracture. The structural fractures are mainly developed near the fault zone, in the central and western part of Qingxichang structure, in the main body of the Puguang structure and in the northern part of the Dawan-Maoba structure. The northern part of the watershed structure and the Tieshan structural belt. The fracture rate calculated by numerical simulation is consistent with that of single well fracture development, and the correlation coefficient is higher.
【作者单位】：中国石化中原油田分公司勘探开发科学研究院;中国石油大学地球科学学院;中国石化石油勘探开发研究院;
【分类号】：P618.13

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