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北部湾盆地W油田区块主要目的层流沙港组流一下亚段储层横向变化复杂,储层孔、渗差异较大。采用常规储层物性、测井解释、岩石薄片和扫描电镜等方法,对W油田流一段下储层特征进行研究,并根据沉积、成岩作用的影响,分析储层质量的主控因素。研究结果表明,流一段下储层岩石类型以石英砂岩和长石质石英砂岩为主,分选较好,呈次棱角—次圆状,物性表现为中—高孔、高渗特征。沉积微相类型是该区储层质量的主控因素之一,扇三角洲前缘沉积河口坝、辫流坝物性最好,辫状水道次之。成岩作用对研究层段的改造作用较为强烈,研究层段所处的成岩阶段为早成岩B期和中成岩A期,发育3个优势孔隙带,孔隙类型主要有粒间溶蚀孔、粒内溶蚀孔、填隙物内溶蚀孔和铸模孔,造成储层孔渗性差异的主要因素是粘土矿物填充吼道。
In the Beibuwan Basin, the main target reservoir of the W Oilfield block, the sub-section of the Liushisha Formation, is characterized by a complex lateral reservoir variation with large differences in pore and reservoir permeability. The characteristics of reservoirs in a section of W oil field are studied by the methods of conventional reservoir properties, log interpretation, rock slices and scanning electron microscopy. According to the influence of sedimentation and diagenesis, the main controlling factors of reservoir quality are analyzed. The results show that the reservoir rocks under the section of flow are dominated by quartz sandstone and feldspathic quartz sandstone, and are well sorted and sub-angular-sub-circular, with medium- high porosity and high permeability. The sedimentary microfacies type is one of the main controlling factors of reservoir quality in this area. The estuarine dam and braided dyke are the best in fan delta front and the braided channel. Diagenesis plays a more important role in the reconstruction of the study interval. The diagenetic stage in the study section is Early Stage B and Mesozoic Stage A, with three dominant porosity zones. The types of pores are mainly intergranular dissolution pores, intragranular dissolution Hole, interstitial eroded hole and mold hole, the main factor that caused the difference of porosity and permeability of the reservoir is clay minerals filled roar.