CAJ | 학술논문

通过普通及铸体薄片、扫描电镜、岩心物性及压汞数据等资料，研究了川南地区须家河组致密砂岩储层的孔隙类型和物性特征，并探讨了孔隙发育类型、孔-渗关系控制因素及砂岩物性空间变化与沉积条件的关系。结果表明，川南地区须家河组以原生粒间孔发育为特征，次为溶蚀孔隙和晶间微孔，渗透率随孔隙度增加呈迅速增加-稳定-再次增加的三段式分布，主要原因是绿泥石、伊利石胶结物的生长抵消了孔隙度增加对渗透率的贡献。平面上，砂岩物性的变化与沉积条件密切相关：短距离搬运或沉积水动力弱的砂岩成分及结构成熟度差，物性差；长距离搬运且沉积于强水动力条件的砂体孔隙发育。纵向上，单一河道砂体的中-中下部物性好于顶、底部，原因是河道沉积时水动力由强变弱，砂体中部成分、结构成熟度好于顶、底部，这也导致了砂体内部成岩作用的非均质性，并最终影响了孔隙的纵向分布。
통과보통급주체박편、소묘전경、암심물성급압홍수거등자료，연구료천남지구수가하조치밀사암저층적공극류형화물성특정，병탐토료공극발육류형、공-삼관계공제인소급사암물성공간변화여침적조건적관계。결과표명，천남지구수가하조이원생립간공발육위특정，차위용식공극화정간미공，삼투솔수공극도증가정신속증가-은정-재차증가적삼단식분포，주요원인시록니석、이리석효결물적생장저소료공극도증가대삼투솔적공헌。평면상，사암물성적변화여침적조건밀절상관：단거리반운혹침적수동력약적사암성분급결구성숙도차，물성차；장거리반운차침적우강수동력조건적사체공극발육。종향상，단일하도사체적중-중하부물성호우정、저부，원인시하도침적시수동력유강변약，사체중부성분、결구성숙도호우정、저부，저야도치료사체내부성암작용적비균질성，병최종영향료공극적종향분포。
Based on thin sections,scanning electron microscopy(SEM),core porosity and permeability data,and mercury injection data ,this paper summarized the pore types , physical property of tight sandstone of the Xujiahe Formation and discussed the controlling factors on pore types ,poroperm relationship and spatial change of physical property .The result shows that the rapid compaction process and minor dissolution resulted in the relative abundant of primary pore followed by dissolution pore and intergrannular micropore .As the porosity increases ,the permeability change shows a three-stage pattern ,namely rapid increasing first ,then getting stabilized and increasing again .This distribution pattern is mainly con-trolled by pore throat filling authigenic chlorite and illite which offset the increases in permeability due to the increase of porosity .The poor connectivity of dissolution pore and micropore also influence the permeability of sandstone .The spatial change of physical property of sandstone is controlled by sedimentary condition .The relative short transport distance or low energy environment resulted in low compositional and textural maturity and poor physical property .Only the sandstone with long transport distance and high energy environment are abundant in porosity .The physical quality in middle and lower part of single fluvial sandstone is better than that of the upper and bottom parts .The major reason is that the decrea-ses of energy during fluvial sandstone deposition result in higher compositional and textural maturity of the middle part and lead to the diagenetic heterogeneity within a single sandstone .