大港滩海区古近系储层类型及次生孔隙成因分析

通过岩心观察、岩石物性统计和砂岩薄片鉴定等方法研究,对表明大港滩海区古近系孔隙类型主要可分为原生孔隙和次生孔隙两大类,并且次生孔隙以次生粒间孔为主,铸体薄片、图像分析及阴极发光研究结果表明,大港滩海区存在两个次生孔隙带:次生孔隙的形成与长石及岩屑的溶蚀,粘土矿物的脱水,沉积相及烃源岩的空间组合,深层异常高压有关。

Through the analysis of core observation,petrophysics statistics and appraisal of sandstone thin section shows the pore type of Gagang offshore area paleogene system are classified into primary pore and secondary pore, and secondary pore is dominated by secondary intergranular pore, The research results on casting thin sections ,image analysis and cathode luminescence showed that there are two secondary pore zone on Dagang offshore area, Formation of secondary pore is related to the dissolution of feldspar and cuttings ,sewatering of clay minerals,space combination relations of sedimentary facies and source rock,deep abnormal high pressure.