CAJ | 학술논문

基于岩石薄片观察、压汞分析、扫描电镜和 X 衍射分析等方法对罗子沟盆地大砬子组砂岩物性特征进行了定性定量研究。结果表明：罗子沟盆地大砬子组砂岩成分成熟度和结构成熟度低，以岩屑长石砂岩和长石砂岩为主；岩石孔隙度高，孔隙度主要为16．2％～26．4％，次生孔隙占总孔隙度面孔率的88％，但总体渗透率极低，渗透率主要分布在（0．13～1．68）×10-3μm2，为高孔特低渗的物性特征。有机元素分析、色谱分析、岩石热解及显微组分镜检分析表明，罗子沟盆地大砬子组泥页岩中有机质在热演化过程中产生大量有机酸，有机酸对砂岩中长石等矿物的溶蚀作用是次生孔隙发育的主要原因，但有机酸溶蚀产生的次生矿物在一定程度上堵塞了孔隙喉道。因此，研究区砂岩形成高孔特低渗的物性特征。
기우암석박편관찰、압홍분석、소묘전경화 X 연사분석등방법대라자구분지대립자조사암물성특정진행료정성정량연구。결과표명：라자구분지대립자조사암성분성숙도화결구성숙도저，이암설장석사암화장석사암위주；암석공극도고，공극도주요위16．2％～26．4％，차생공극점총공극도면공솔적88％，단총체삼투솔겁저，삼투솔주요분포재（0．13～1．68）×10-3μm2，위고공특저삼적물성특정。유궤원소분석、색보분석、암석열해급현미조분경검분석표명，라자구분지대립자조니혈암중유궤질재열연화과정중산생대량유궤산，유궤산대사암중장석등광물적용식작용시차생공극발육적주요원인，단유궤산용식산생적차생광물재일정정도상도새료공극후도。인차，연구구사암형성고공특저삼적물성특정。
Physical characteristics of sandstone in Luozigou basin were studied qualitatively and quantitatively with thin sections,mercury intrusion,SEM,X-ray diffractions and some other methods. Results show that the main lithological types of Dalazi Formation are lithic arkose and arkose with low compositional maturity and low textural maturity. The physical characteristics of sandstone were characterized by high porosity (16.2% to 26.4%)and very low permeability(0.13×10 -3μm2 to 1.68× 10-3μm2 ),and the porosity type was mainly secondary pores which accounst for 88% of the whole porosity.Result of organic element analysis,chromatography,maceral microscopy and rock pyrolysis showed that large amounts of organic acids generated during the thermal evolution of mudstone and shale in Luozigou basin and dissolute feldspar in sandstone,which lead to high secondary porosity.While,at the same time,associated products of the dissolution blocked the throat to some extent.These two processes make the sandstones show high porosity and low permeability.