CHARACTERISTICS OF THE PALEO-STRESS IN THE SOUTHWESTERN MARGIN OF XUEFENG UPLIFT AND ITS SIGNIFICANCE FOR PETROLEUM GEOLOGY
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摘要: 在野外地质调查、平衡剖面分析的基础上, 结合区域构造演化, 采用岩石声发射法对雪峰隆起西南缘的最大古应力进行了恢复, 并探讨了古应力大小与油气成藏破坏的关系。研究结果表明, 研究区共经历了5期不同强度的重要构造变革运动。在早古生代末期和印支期构造运动较弱, 声发射法的测量表明古应力值分别为13.3 MPa和24 MPa, 对应于麻江古油藏的主要成藏期。构造运动次数较多或者古应力值较大的时期, 主要对应于麻江古油藏储集层的发育期和油藏大规模破坏期。晚古生代末期构造活动次数较少, 但恢复地古应力值较大, 为92.6 MPa; 燕山期和喜马拉雅期经历了多期构造活动, 恢复地古应力值为23.3~74.4 MPa。Abstract: Based on the geological survey, balanced cross-section analysis and regional tectonic evolution, we take advantage of rock acoustic emission information to restore the maximum paleo-stress in the southwest margin of Xuefeng Uplift, and discuss the relationship between the maximum paleo-stress and hydrocarbon accumulation and damage. The results show that the study area has undergone five key structural reforms of different intensities. In the early Paleozoic and Indosinian cycle, the tectonic movement is weak, and the maximum paleo-stress are 13.3 MPa and 24 MPa respectively, equivalent to the main accumulation period of Majiang ancient reservoir. The high-frequency and high-intensity paleostress correspond to accumulation and damage of Majiang ancient reservoir. The Neopaleozoic structural deformation with the maximum paleo-stress of 92.6 MPa represents the formation of the reservoir. The Yanshan and Himalayan structural movements, with the restored paleo-stress from 23.3 MPa to 74.4 MPa, cover the period of extensive destruction of paleo-reservoir.
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Key words:
- acoustic emission /
- paleo-stress /
- Majiang paleo-reservoir /
- petroleum geology /
- Xuefeng Uplift
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图 1 雪峰隆起西南缘古油藏分布
1.凯里—虎庄背斜型残余油气藏(O1—S1); 2.麻江背斜型古油藏(O1—S1), 3.丹寨背斜岩性古油藏(∈1)
Figure 1. Distribution of paleo reservoirs around the southwest margin of Xuefeng Uplift
图 2 麻江古油藏形成与破坏模式图
Figure 2. The model for formation and destruction of the Majiang ancient reservoir
表 1 雪峰隆起西南缘声发射法古应力恢复的最大主应力和构造期次
Table 1. Maximum principal stress and tectonic stages by AE restoring in southwest margin of Xuefeng Uplift
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