石油与天然气地质 ›› 2020, Vol. 41 ›› Issue (2): 316-327.doi: 10.11743/ogg20200208
程丽娟1,2(), 李忠1,2,*(
), 刘嘉庆1,2, 于靖波3
收稿日期:
2019-05-05
出版日期:
2020-04-28
发布日期:
2020-04-03
通讯作者:
李忠
E-mail:chenglijuan211@163.com;lizhong@mail.iggcas.ac.cn
作者简介:
程丽娟(1987-),女,博士研究生,矿物学、岩石学、矿床学。E-mail:基金资助:
Lijuan Cheng1,2(), Zhong Li1,2,*(
), Jiaqing Liu1,2, Jingbo Yu3
Received:
2019-05-05
Online:
2020-04-28
Published:
2020-04-03
Contact:
Zhong Li
E-mail:chenglijuan211@163.com;lizhong@mail.iggcas.ac.cn
摘要:
塔里木盆地巴楚-塔中地区盐下白云岩有效储层空间非均质性较强,储层分布不仅受颗粒滩、生物礁等高能沉积相带影响,成岩改造作用成岩改造作用也相当显著。通过对巴楚-塔中地区井下样品的显微观测、地化分析及测井资料配套解释,详细刻画了盐下白云岩特征,进一步认识了成岩改造过程及其对白云岩储集体的制约机制。结果表明,下寒武统盐下白云岩主要为泥粉晶白云岩、颗粒云岩、微生物白云岩和细晶白云岩,储集体主体呈现出早期经历过大气淡水成岩改造作用,中期孔隙度保持,晚期储集物性进一步改善的演化趋势;盐下白云岩优质储层是适中白云石化作用、上覆膏盐岩层对下伏层段的遮挡作用,以及后期热流体溶蚀改造作用共同叠加的结果;构造-热流体对储层的改造在垂向上分为5个成岩作用带,即热流体矿物发育带、热流体角砾化作用带、裂缝发育带、溶蚀作用带和热流体白云石胶结带,其中溶蚀作用带对储层建设作用最强,其次为裂缝发育带。
中图分类号:
图3
塔里木盆地巴楚-塔中地区下寒武统盐下白云岩类型与物性特征 a.泥晶白云岩裂缝被白云石、石英充填,舒探1井,埋深1 992.4 m,50×-;b.泥粉晶白云岩裂缝发育,康2井,埋深5 491.5 m,25×-;c.泥粉晶白云岩,中深1井,埋深6 721.97 m,50×-;d.角砾化白云岩,舒探1井,埋深1 888.6 m,50×-;e.硅化的鲕粒白云岩,康2井,埋深5 633.49 m,25×-;f.早期长柱状硬石膏胶结的泥晶云岩,方1井,埋深4 369.5 m,25×-;g.细晶白云岩发育晶间孔和晶间溶孔,舒探1井,埋深1 917.7 m,50×-;h.细晶白云岩裂缝发育,舒探1井,埋深1 989.2 m,25×-;i.中细晶白云岩,方1井,埋深4 572.8 m,50×-;j.叠层石,粗晶鞍状白云石顺层分布,热流体溶孔发育,舒探1井,埋深1 885.8 m,25×-;k.泡沫绵层藻云岩,方1井,埋深4 599.7 m,50×-;l.层纹石,舒探1井,埋深1 883.6 m,50×-"
图4
塔里木盆地塔中-巴楚地区盐下白云岩胶结充填类型与特征 a.泥晶白云岩内充填长柱状硬石膏,康2井,埋深5 490.56 m,25×-;b.同a,25×+;c.泥粉晶白云岩,康2井,埋深5 491.1 m,50×-;d.同c,50×+;e.泡沫绵层藻云岩充填多期白云石胶结物,方1井,埋深4 592.9 m,50×-;f.同e,阴极发光图(CL);g.泥晶白云岩裂缝被铁白云石充填,舒探1井,埋深2 062.01 m,100×-;h.同g,CL图;i.粉细晶白云岩,舒探1井,埋深1 992.5 m,25×-;j.同i,CL图;k.泥粉晶云岩孔洞被方解石充填,舒探1井,埋深1 883.6 m,25×-;l.同k,CL图"
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