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运用微观薄片、扫描电镜和微观图像等资料,以东营凹陷北部陡坡带深层砂砾岩体天然气储层为例,结合其储层温度与埋深资料,应用定量回推反演的方法对低渗透天然气储层孔隙演化进行了定量研究。根据储集空间类型和孔隙特征将储层划分为以次生溶蚀孔隙为主、次生孔隙与原生残余孔隙共存和以微裂缝为主3种类型。依据对储层物性的影响可以将成岩作用分为2大类:建设性的成岩作用类型(欠压实作用、溶解作用和重结晶作用)和破坏性的成岩作用类型(压实作用、沥青充填作用及各种胶结沉淀作用),并引入成岩作用强度的概念,定量分析了各类成岩作用对3种类型储层的孔隙演化的控制作用,认为Ⅰ型储层主要受酸性溶蚀作用影响,Ⅱ型储层由于上覆膏盐层的影响保留了一定量的原生孔隙,Ⅲ型储层早期压实强烈,后期酸性地层水很难进入,基本无溶蚀作用。
Taking the thin layer, scanning electron microscopy and microscopic images as an example, taking the gas reservoir of deep glutenite body in the steep slope belt in the northern part of Dongying depression as an example, with the data of reservoir temperature and depth, the quantitative backpropagation method was used to measure the gas content of low permeability natural gas The evolution of reservoir porosity has been quantitatively studied. According to the type of reservoir space and pore features, the reservoirs are divided into three types: secondary dissolution pores, secondary pores and primary residual pores, and microfractures. Diagenesis can be divided into two major groups according to their influence on reservoir physical properties: constructive diagenesis types (under-compaction, dissolution and recrystallization) and destructive diagenetic types (compaction, bitumen filling Function and various cementation and sedimentation), and the concept of diagenesis intensity is introduced to quantitatively analyze the controlling effect of various diagenesis on the pore evolution of three types of reservoirs. It is concluded that the type Ⅰ reservoir is mainly affected by acid dissolution Ⅱ Type reservoirs retain a certain amount of primary porosity due to the overlying gypsum salt layer. Type III reservoirs are strongly compacted early, and acidic formation water is difficult to enter in the late period with little or no dissolution.