CAJ | 학술논문

一般研究认为岩石中的碳酸盐矿物在酸性条件下易发生溶蚀作用从而生成次生孔隙，进而增大岩石的储集空间和渗透性。柴达木盆地砂西地区始新统下干柴沟组碎屑岩储层为咸化湖盆沉积，偏光显微镜下和扫描电镜下可见石膏和铁白云石较为发育。通过流体-岩石动力学模拟实验研究得出，在地层条件下高温高压环境中铁白云石易发生溶蚀作用从而形成次生孔隙，石膏在其中起催化作用；铁白云石溶蚀生成的铁、镁离子为高岭石转化为绿泥石提供了必要的物质条件，生成的针叶状绿泥石极易堵塞较细的孔隙喉道造成了岩石渗透率的下降，但铁白云石等易溶矿物的溶蚀作用增加了岩石的孔隙度。
일반연구인위암석중적탄산염광물재산성조건하역발생용식작용종이생성차생공극，진이증대암석적저집공간화삼투성。시체목분지사서지구시신통하간시구조쇄설암저층위함화호분침적，편광현미경하화소묘전경하가견석고화철백운석교위발육。통과류체-암석동역학모의실험연구득출，재지층조건하고온고압배경중철백운석역발생용식작용종이형성차생공극，석고재기중기최화작용；철백운석용식생성적철、미리자위고령석전화위록니석제공료필요적물질조건，생성적침협상록니석겁역도새교세적공극후도조성료암석삼투솔적하강，단철백운석등역용광물적용식작용증가료암석적공극도。
It is generally believed that carbonate minerals can easily dissolve. This process will lead to the formation of secondary pores, thereby enlarging the reservoir space and improving the permeability of reservoir rocks. In the QaidamBasin, clastic reservoirs of the Lower Eocene Gancaigou Formation are deposits of saline lacustrine basin, with plaster and ankerite well developed in rock flacks as revealed by polarized light microscopy and scanning electron microscope. Experimental results of fluid-rock dynamic stimulation show that the ankerite dissolution can generate secondary pores, and gypsum catalyzes the dissolution. The iron and magnesium ions generated are reactants in the transformation from koalinite to chlorite. The foliated chlorite easily blocks thin throat, leading to the decrease of permeability, while the dissolution of easily soluble minerals like ankerite increases porosity.