安塞地区长10_1相对高渗储层特征及控制因素分析

安塞地区长101物性变化大,高渗带高产,低渗带不出油,勘探风险大.为了更好的认识长101油层,引入了相对高渗储层的概念.利用岩心、薄片、扫描电镜、粒度、图像、X衍射、物性、压汞等多种分析手段,研究了安塞地区长101相对高渗储层的岩石学特征、成岩作用特征及孔隙结构特征,并分析出形成相对高渗储层的影响因素.研究表明,安塞地区长101相对高渗储层为中粗粒-中粒含浊沸石长石砂岩和岩屑砂岩,成分成熟度较高,胶结物主要为绿泥石胶结,成岩作用主要表现为次生溶蚀,储集层主要为浊沸石溶蚀孔、长石溶蚀孔及残余粒间孔;相对高渗储层的影响因素主要有储层的沉积相、胶结物、成岩作用、裂缝及构造作用.

Relative High Permeability Reservoir Characteristics and Control Factor Analysis in Chang 101 Layer of Ansai Area

Chang 101 formation of Ansai area characterized by large-change property,high-yielding in higher permeability zone and no oil production in lower permeability zone,which decide the exploration have great risk in this area.Introduceed the theory of relatively high permeability reservoirs.Using many kinds of analysis methods such as core,chip,scanning electron microscope,grain size,the image,X-ray diffraction,physical properties,mercury injection and so on,researched petrology characteristics,diagenesis characteristics and pore structure features of the relatively high permeability reservoir chang101 formation in Ansai area,analysised the influencing factors of forming the relatively high permeability reservoir and formed medium coarse-medium grain feldspathic sandstone with laumontite and lithic sandstone,high composition maturity,chlorite cementation,diagenesis shows mainly secondary corrosion,such presented as turbidity zeolite dissolution holes,feldspar dissolution holes and residual intergranular holes.Main influencing factors of relatively high permeability reservoirs are reservoir sedimentary facies,cementation,diagenesis,fracture and tectonism.