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基于周口店八角寨雾迷山组碳酸盐岩露头断层密度、断层内部结构和断裂带泥质质量分数的分析,结合岩石形变三维应力数值模拟及塔中碳酸盐岩油藏岩心和薄片多期方解石交切胶结关系,揭示了碳酸盐岩层系断层封闭机理,提出了一种精确测定碳酸盐岩中泥质质量分数的实验方法.研究结果表明:该断裂带具有明显的二元结构特征,主断层核部岩石破碎程度大,断层密度高,随着远离主断层,断层密度大体呈指数降低;围岩碳酸盐中泥质质量分数一般为10%～15%,而在断层核部位,泥质质量分数增加到30%～40%,明显增加了2～3倍,同时,随着远离断层核的部位,泥质质量分数稳定下降,说明在碳酸盐岩层系的断层中,高泥质含量仍然是断层封闭的最重要的机理之一;岩性组成及含量的不同也会导致岩石在应变形态上的差别;碳酸盐矿物特别是方解石脉多期交切、结晶现象在破碎带中广泛分布,说明胶结作用是影响碳酸盐岩层系断层封闭的另一个重要因素.
Based on the analysis of the carbonate outcrops fault density, the internal structure of the faults and the muddy mass fraction in the fault zone in the Fagaceous Mieshan Formation, Bajiaozhai, Zhoukoudian, combined with the three-dimensional numerical simulation of rock deformation and the multi-period The relationship between cementation and cementation of calcite was revealed, the mechanism of fault sealing in carbonate strata was revealed, and an experimental method for accurately determining the mass fraction of shale in carbonate rocks was proposed. The results show that the fault has obvious binary structure , The rock of the main fault has a large degree of rock fragmentation and high fault density, and the fault density decreases roughly exponentially with distance from the main fault. The shale mass fraction of carbonate in the surrounding rock generally ranges from 10% to 15% , The shale mass fraction increased to 30% ~ 40%, obviously increased 2 ~ 3 times, at the same time, as the part away from the fault nucleus, the shale mass fraction decreased steadily, indicating that in the carbonate system fault, the high The shale content is still one of the most important mechanisms of fault sealing. The lithology composition and content also lead to the difference in rock strain. The carbonate minerals, especially calcite veins, The belt is widely distributed, indicating that cementation is another important factor affecting the fault closure of carbonate strata.