CAJ | 학술논문

以渝东南地区渝页1井和黔西北地区习页1井、桐页1井的下志留统龙马溪组页岩岩心样品为研究对象,使用场发射扫描电镜观察孔隙的微观形态,并通过X射线微米CT扫描提取孔隙的空间结构参数,力求从二维、三维层面分别对页岩的孔隙进行特征定性.由扫描电镜观察知,研究区页岩气储层发育粒间孔、粒内孔、有机质孔及微裂缝等多种类型,孔隙多为宏孔(>50 nm)及中孔(2~50 nm).粒间孔中,矿物晶粒间孔发育较广泛;粒内孔以矿物集合体内孔为主,如"草莓状"黄铁矿结核内的晶间孔隙;有机质孔多为圆形、椭圆形的宏孔及中孔.通过CT扫描和孔隙模型的三维重建可知,孔隙多呈孤立状、条带状分布,连通性较差.
이투동남지구투혈1정화검서북지구습혈1정、동혈1정적하지류통룡마계조혈암암심양품위연구대상,사용장발사소묘전경관찰공극적미관형태,병통과X사선미미CT소묘제취공극적공간결구삼수,력구종이유、삼유층면분별대혈암적공극진행특정정성.유소묘전경관찰지,연구구혈암기저층발육립간공、립내공、유궤질공급미렬봉등다충류형,공극다위굉공(>50 nm)급중공(2~50 nm).립간공중,광물정립간공발육교엄범;립내공이광물집합체내공위주,여"초매상"황철광결핵내적정간공극;유궤질공다위원형、타원형적굉공급중공.통과CT소묘화공극모형적삼유중건가지,공극다정고립상、조대상분포,련통성교차.
Pore space is characteristic in Lower Silurian Longmaxi shale reservoirs in southeastern Chongqing and northwestern Guizhou areas.Shale samples are collected from Wells YY-1,XY-1 and TY-1 in the areas.Observed with SEM,four types of pores can be recognized,including intergranular pores,intragranular pores,organic-matter pores and microfractures,most of which are macropores (>50nm) and mesopores (2~50nm).Mineral intercrystalline pores are common in intergranular pores.Mineral aggregates,such as pyrite framboids,are general in intragranular pores.Organic-matter pores are mostly round or elliptic with large sizes as macropores and/or mesopores.By the micro-CT scanning to part of samples,the 3-D structure models of nanometer-scaled pores are re-established.It is shown that most micropores are isolated or stripped with poor pore networks and connectivity in Longmaxi shales.