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以马来西亚沙捞越巴拉姆三角洲为研究对象,进行取样岩心和薄片分析,结合EDX(能量色散X射线)、FESEM(场发射扫描电镜)、压汞测孔隙度和点状渗透率测量等方法评估生物扰动对储集层孔隙度和渗透率的影响。岩心取自巴拉姆三角洲W-1井和W-6井,分析结果显示,W-1井样品主要发育双杯迹潜穴(Diplocraterion),为强烈—剧烈生物扰动,可见沉积物充填,沉积物充填活动将宿主沉积物中的细粒物质(黏土和有机物)混入潜穴充填物和潜穴衬里,降低沉积物的均质性和分选性,导致潜穴中局部区域孔隙度和渗透率降低;W-6井样品主要发育蛇形迹潜穴(Ophiomorpha),为强烈—剧烈生物扰动,黏土和泥质被清除出潜穴充填物和宿主沉积物,聚集于潜穴衬里,潜穴生物的沉积物清除活动导致潜穴内部沉积充填物的分选性变好、孔隙度和渗透率升高。生物扰动对储集层孔隙度和渗透率的影响由潜穴及其充填物和潜穴活动的类型决定。
Taking the Balam delta of Sarawak, Malaysia as the research object, the sampling cores and thin sections were analyzed. The methods of EDX (energy dispersive X-ray), FESEM (field emission scanning electron microscope), mercury porosimetry and dot permeability measurement Evaluate the effect of bioturbation on reservoir porosity and permeability. The cores were taken from wells W-1 and W-6 in the Baram Delta. The results show that the samples of Well W-1 mainly develop Diplocraterion, which are intense-drastic bioturbation. Sediment filling and deposition Material-filling activities mix fine-grained materials (clay and organic matter) in host sediments into burrows and burrows, reducing sediment homogeneity and sorting, leading to localized porosity and permeability in the burrows Lowering; Well W-6 mainly developed Ophiomorpha, a strong-drastic biological perturbation in which clay and muddy debris were removed from the fillings and host sediments of the cave, Sediment removal activities lead to better separability of the fillings within the burrows and higher porosity and permeability. The effects of bioturbation on reservoir porosity and permeability are determined by the type of the hole and its fillings and the activity of the hole.