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中文摘要：
鄂尔多斯盆地镰刀湾地区长6长石砂岩中的胶结物类型复杂多样,质量分数高,主要有浊沸石、绿泥石、方解石、硅质、长石质等,特别是浊沸石胶结主要发育在三角洲前缘水下分流河道的叠置砂体中.在早成岩期由于浊沸石、方解石的胶结作用及石英的次生加大作用,使原始孔隙度进一步减少,中成岩阶段发生了浊沸石、碳酸盐胶结物及长石等碎屑的溶蚀,形成次生孔隙.东角洲前缘水下分流河道微相是浊沸石胶结的主要相带,且叠置的水下分流河道砂岩中浊沸石质量分数高,连通性差的水下分流河道中浊沸石的质量分数降低,分流间湾、河口坝、水下决口扇微相中浊沸石质量分数低,以钙质、泥质、硅质胶结为主.由于脱羧基作用水下分流河道砂体中形成浊沸石溶孔,且从湖盆中心向湖岸方向形成了浊沸石溶蚀相以及浊沸石弱溶蚀相,大量浊沸石次生溶孔为鄂尔多斯盆地延长组岩性油藏提供了良好的储集条件.
英文摘要：
The cement type of feldspathic sandstone in Chang-6 formation mainly includes laumontite,chlorite, calcite,silica,feldspar,et al,particularly laumontite cementation developed in the superposed sand of underwater distributary channel in the delta front.Original porosity decreased in early diagenesis because of laumontite,calcite cementation and quartz overgrowth.Secondary porosity developed in middle diagenesis because of corrosion debris such as laumontite,carbonate cements and feldspar,etc.The underwater distributary channel microfacies in the delta front were the main phase of laumontite cementation and laumontite contents of the superposed sand in underwater distributary channel were numerous and reduced poor connectivity of underwater distributary channel.Meanwhile,calcium,clay and silica cementation developed in the gulf stream,bar and underwater crevasse splay;a large number of laumontite secondary porosity provided reservoir conditions for the lithologic reservoir in Yanchang formation,because laumontite secondary porosity developed in dehydroxylation and laumontite dissolution phase was weak from teh lake center to shore.
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