ANALYSIS ON FRACTURE POTENTIAL FOR DIFFERENT TYPES OF ROCKS IN ARCHEAN BURIED HILL: A CASE STUDY OF LIAOHE WESTERN SAG
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摘要:
太古宇结晶变质岩是潜山的重要储集层岩石类型, 然而对太古宇不同类型变质岩裂缝发育潜力的相对大小迄今还没有明确的标志。通过大量的岩石力学实验、岩心裂缝观测、成像测井资料分析和油田生产实践等相结合的方法, 探索分析太古宇不同岩石类型裂缝发育的相对潜力, 并提出了脆性系数(fb)的概念。岩石力学试验结果表明, 太古宇不同岩性的岩石力学性质存在差异, 脆性系数总体有随暗色矿物增加而减小的趋势; 定向构造发育的片麻岩类岩石的力学参数与变形方向密切相关, 其中片麻理与加载方向夹角大于45°时的脆性系数fb明显小于夹角小于45°时的脆性系数。大量生产实践资料表明, 定向构造发育的片麻岩类容易发育剪裂缝, 而定向构造不发育的粒岩类则容易发育张性裂缝。综合分析揭示, 不同岩性剪裂缝发育潜力从大到小的次序为:片麻岩类→混合花岗岩类→角闪岩; 不同岩性张性裂缝发育潜力从大到小的次序为:混合花岗岩类、浅粒岩→片麻岩类→角闪岩。
Abstract:The Archean crystallization metamorphic rocks are important reservoir rock types in buried hill, and fracture developmental potential for different types of Archean metamorphic rocks have not been yet clearly recognized.Based on a large number of rock mechanics experiments, core fracture observation, imaging logging data, and oil field production practices, the fracture developmental potential for different types of Archean metamorphic rocks has been analyzed.Rock mechanics test results show that the mechanical properties are changable in different Archean lithology, e.g., the brittleness coefficient generally decreases with increase of dark minerals.In addition, rock mechanics parameters are closely related to the loading direction in gneiss which bear well-developed oriented structure.The brittleness coefficient fb gets greater when the angle between gneissosity and the loading direction changes from less than 45° into greater than 45°.A large number of oil production practice data show that shear fracture is more often seen in the gneiss with oriented structure, while tension fracture in the granulite without oriented structure.According to the comprehensive analysis, the development potential of shear fracture in different rocks can be arranged as:gneiss class > mixed granite class > amphibolite; while that of tension fracture as: mixed granite class, light granulite > gneiss class > amphibolite.
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表 2 西部凹陷太古宇不同岩石类型岩石力学试验参数分布
Table 2. A list of parameters used in rock mechanical test for different types of Archean rock in West Depression
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