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基于马来西亚沙捞越(Sarawak)盆地Belait组和Lambir组第三系露头样品,分析其石英表面形态,揭示其颗粒表面结构缺陷(源自风化作用和成岩作用)、古沉积环境以及储集层质量之间的相关关系。研究利用岩石薄片进行矿物识别,并观察粒径和结构;利用扫描电镜对样品的表面形态进行表征,以展现石英颗粒表面结构的变化。Belait组砾岩的扫描电镜图像表明其以自形石英晶体为主,常见机械风化缺陷,例如线性断口、贝壳状断口以及擦痕;而Lambir组砂岩中却常见化学风化特征,例如化学蚀痕、蚀坑、溶解坑以及刻痕。基于岩石学、扫描电镜以及CT扫描图像分析的储集层质量评价结果表明,研究区Belait组为高能海岸沉积,潮控特征明显,Lambir组为浅海—三角洲沉积,浪控特征明显;Belait组和Lambir组的储集层质量较差,但Belait组的孔隙度略高于Lambir组。图14表1参36
Based on the Belait Formation and the Lambir Tertiary outcrop samples from the Sarawak Basin, Malaysia, the quartz surface morphology was analyzed to reveal the surface structural defects (from weathering and diagenesis), paleo-sedimentary environments and reservoir quality The correlation between. In this study, the rock fragments were used for mineral identification, and the particle size and structure were observed. The surface morphology of the samples was characterized by scanning electron microscopy to show the change of surface structure of quartz particles. Scanning electron micrographs of Belait conglomerates show that they are predominantly self-shaped quartz crystals, with common mechanical weathering defects such as linear fractures, shell-like fractures, and scratches; whereas Lambir sandstones commonly have chemical weathering features such as chemical etching, Pits, pits, and nicks. The reservoir quality evaluation based on petrography, SEM and CT scanning image analysis shows that the Belait Formation in the study area is characterized by high-energy coast deposition and obvious tide-controlling characteristics. The Lambir Formation is characterized by shallow sea-delta deposition and obvious wave-control features. The Belait Formation and The reservoirs in the Lambir Formation have poorer quality, but the porosity of the Belait Formation is slightly higher than that of the Lambir Formation. Figure 14 Table 1 Reference 36