CAJ | 학술논문

　　利用铸体薄片、扫描电镜等测试技术和储层综合评价方法对姬塬地区长8砂岩成岩作用及有利成岩相带进行了系统分析，结果表明，长8砂岩处于晚成岩阶段A期，压实作用造成砂岩中原生孔隙丧失；受酸性成岩环境影响，长石类不稳定矿物发生溶蚀，产生的溶蚀孔隙有效地改善了孔隙的连通性和渗透性，成岩早期形成的绿泥石粘土膜保留了大量原生粒间孔，保持了较好的储层物性。结合成岩作用和沉积特征，研究区可划分出4种主要成岩相带。长石溶蚀成岩相和绿泥石膜—粒间孔成岩相是最为有利的成岩相带，分布在刘卯塬—堡子湾一带的三角洲前缘水下分流河道砂体发育区，以及小涧子一带三角洲分流河道交汇处的砂体发育区。
　　이용주체박편、소묘전경등측시기술화저층종합평개방법대희원지구장8사암성암작용급유리성암상대진행료계통분석，결과표명，장8사암처우만성암계단A기，압실작용조성사암중원생공극상실；수산성성암배경영향，장석류불은정광물발생용식，산생적용식공극유효지개선료공극적련통성화삼투성，성암조기형성적록니석점토막보류료대량원생립간공，보지료교호적저층물성。결합성암작용화침적특정，연구구가화분출4충주요성암상대。장석용식성암상화록니석막—립간공성암상시최위유리적성암상대，분포재류묘원—보자만일대적삼각주전연수하분류하도사체발육구，이급소간자일대삼각주분류하도교회처적사체발육구。
The diagenesis and favorable diagenetic facies of Chang8 reservoir in Jiyuan area of the Ordos Basin were studied by means of cast thin section, SEM and reservoir comprehensive evaluation. The Chang8 sandstones were during the subphase A of late diagenesis. Compaction effect caused the disappearance of primary pores. In-fluenced by acidic diagenetic environment, feldspars were corroded, improving pore connectivity and permeabili-ty. In the well-developed chlorite film which generated during early stage, a large quantity of primary pores was preserved, showing good reservoir physical property. According to diagenetic and sedimentary features, 4 diage-netic facies belts were classified. The diagenetic facies belts of feldspar corrosion and chlorite film-intergranular pore were most favorable, mainly distributing in sandbody zones in subaqueous distributary channel of delta front in Liumaoyuan and Baoziwan areas, and in distributary channel of delta in Xiaojianzi area.