塔里木库车坳陷中新生界储层砂岩成岩期钠长石化

被引:25
作者
叶瑛
沈忠悦
郑丽波
王怀照
方大钧
机构
[1] 浙江大学地球科学系
关键词
塔里木盆地库车坳陷储层砂岩钠长石化;
D O I
10.16108/j.issn1006-7493.1999.03.002
中图分类号
P618.130.21 [];
学科分类号
摘要
库车坳陷中新生界以陆相碎屑建造为主,在该区储层砂岩中,钠长石为广泛存在的自生矿物之一。显微结构证据显示,成岩期钠长石交代长石等碎屑,或呈细小自形晶填隙产出;在化学成份上,钠长石与被交代的长石存在过渡关系。在碎屑长石钠长石化过程中,母体相的溶解速率大于钠长石的沉淀速率,并伴有石英、高岭石等矿物的消耗,因此有助于次生孔隙的发育及储层物性的改善。从高岭石的垂向分布,以及钠长石相对含量与埋深的关系,可以看出钠长石化作用主要发生在深成岩带( mesodiagenesis) ,对应于4 000 ~5 500m 埋深,和90 ℃~110 ℃地温带。在库车和塔北地区,主要工业油气藏亦集中分布在这一深度带。
引用
收藏
页码:251 / 259
页数:9
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