CAJ | 학술논문

为明确东濮凹陷文东地区沙三段储集层硬石膏胶结的形成机制，对其开展了薄片鉴定、包裹体测温及扫描电镜分析。结果表明，文东地区沙三段储集层硬石膏以斑块状胶结为主，处于中成岩 A－中成岩 B 期。盐岩溶解增大了硫酸钙的溶解度，使得硬石膏发育的储集层，硫酸钙饱和系数多大于140；其物质来源主要包括：古沉积水、膏盐岩溶解、阳离子交替吸附作用、长石与碳酸盐胶结物的溶蚀及斜长石钠长石化。硬石膏胶结在垂向上多发育在与膏盐岩及含膏泥岩临近的储集层，平面上主要发育在膏盐岩分布的边缘、与砂岩层呈指状交互的区域，油气充注及裂缝是 Ca2＋和 SO2－4注入储集层的主要途径。
위명학동복요함문동지구사삼단저집층경석고효결적형성궤제，대기개전료박편감정、포과체측온급소묘전경분석。결과표명，문동지구사삼단저집층경석고이반괴상효결위주，처우중성암 A－중성암 B 기。염암용해증대료류산개적용해도，사득경석고발육적저집층，류산개포화계수다대우140；기물질래원주요포괄：고침적수、고염암용해、양리자교체흡부작용、장석여탄산염효결물적용식급사장석납장석화。경석고효결재수향상다발육재여고염암급함고니암림근적저집층，평면상주요발육재고염암분포적변연、여사암층정지상교호적구역，유기충주급렬봉시 Ca2＋화 SO2－4주입저집층적주요도경。
To make clear of the forming mechanism of anhydrite cementation in the Es3 sandstone reservoir of the Wendong area,Dongpu depression,thin section analysis,micorscopic thermometry technology of inclusion and scanning electron microscopy were applied.Result showed that anhydrite cementation in the Es3 sandstone reservoir of the Wendong area are patchy,which mainly developed in the middle diagenetic stage of A and B.The solubility of calcium sulfate increased since of the dissolution of salt rocks,and the saturation coefficient of calcium sulfate in sandstone reservoirs was larger than 1 40.Its material sources mainly included:ancient sedimentary water,gypsum-salt rocks dissolution,cation alterna-tive adhesive action,dissolution of feldspar and carbonate cements and the albitization of plagioclase.Vertically,the reser-voirs containing anhydrite cementation mainly distributed near the gypsum-salt rocks and gypsum mudstones,horizontally, they distributed at the edge of gypsum-salt rocks where gypsum-salt rocks and sandstones interfingered together.Hydrocar-bon filling and overpressured fractures were the main ways for Ca2+ and SO 2-4 entering the reservoirs.