CAJ | 학술논문

通过对华庆地区长6段岩心铸体薄片及物性资料分析,研究了其岩石学特征、孔隙类型、微观孔隙结构特征、孔渗特征及成岩作用。认为研究区长6储层发育三角洲前缘及深水浊积扇沉积,三角洲前缘水下分流河道和上扇主沟道是储层分布的主要相带,主要发育细粒岩屑长石砂岩及长石砂岩、长石岩屑砂岩；粒间孔及长石溶孔是主要储集空间。孔喉分布表现为小孔微细喉,非均质性强；孔隙度平均为9.5%,渗透率平均为0.38×10-3μm2,为一套低孔低渗-特低渗储层。研究区砂岩埋藏后经历的成岩作用主要有压实作用、胶结作用及溶蚀作用。强烈的压实作用、胶结作用是使孔隙大量消失、物性变差的主要原因；而溶蚀作用,特别是长石、岩屑及浊沸石溶孔在很大程度上改善了储层的储集性能。
통과대화경지구장6단암심주체박편급물성자료분석,연구료기암석학특정、공극류형、미관공극결구특정、공삼특정급성암작용。인위연구구장6저층발육삼각주전연급심수탁적선침적,삼각주전연수하분류하도화상선주구도시저층분포적주요상대,주요발육세립암설장석사암급장석사암、장석암설사암；립간공급장석용공시주요저집공간。공후분포표현위소공미세후,비균질성강；공극도평균위9.5%,삼투솔평균위0.38×10-3μm2,위일투저공저삼-특저삼저층。연구구사암매장후경력적성암작용주요유압실작용、효결작용급용식작용。강렬적압실작용、효결작용시사공극대량소실、물성변차적주요원인；이용식작용,특별시장석、암설급탁비석용공재흔대정도상개선료저층적저집성능。
Based on the analysis of thin sections and physical property of Chang 6 reservoir in Huaqing area,the paper studied the petrology feature,pore styles,the microscopic reservoir structure,characteristics of porosity and permeability as well as the diagenesis.The results suggest that delta sediments and turbidite fan of deep water are the main deposits in the Chang 6 reservoir.Delta front underwater distributary channel and turbidite fan are the main facies belt forming reservoirs of Chang 6 .Lithic arkose sandstones,and feldspathic sandstone are maj or rock developed in this area;the granular pore and secondary feldspar-dissolution pore are the main pore types.Pore throat presents fine pore and fine throat with high micro-heterogeneity. The average porosity is less than 9.5%,and the permeability is below 0.38×10-3μm2 .So Chang 6 reservoir belongs to low porosity and low permeability reservoir. The low-permeability sandstone had undergone complicated diagenesis, especially compaction, cementation and dissolution.The compaction and cementation that lead to porosity loss are the main factors causing low porosity and permeability.But the dissolution,especially dissolving pores in the feldspar and authigenic laumontite largely improves the reservoir property.