摘要
以准噶尔盆地腹部侏罗系砂岩油气储层为例,在野外与岩芯观测的基础之上,通过显微和扫描电镜鉴定,并结合粉末X射线衍射和电子探针成分分析,发现有大量自生高岭石发育于储层长石溶蚀后的孔隙中,可以很少或大量原地沉淀,使得储层物性变好或变差。这些自生高岭石是含油气酸性流体与砂岩中碱性长石发生水岩反应的产物,在油源断裂附近的中粒-中粗粒砂岩层中,含油气流体活动强度大、渗流速度较高,高岭石易于迁移至别处,储层物性得到改善,反之高岭石则倾向于原地沉淀,储层物性变差。
By means of core drilling and micro-observation, SEM, X-ray and EPMA analysis, it has been confirmed that a large amount of diagenetic kaolinite is developed in the Jurassic feldspar sandstone reservoirs, central Junggar Basin. It could be a little and much developed in sandstone solution pores, indicating it is a possible key factor affecting the quality of reservoir rocks. The kaolinite resulted from petroleum- beating fluid and sandstone alkalescence feldspar interaction. If the reservoir is located near the thrust hydrocarbon fault and the reservoir sandstone is coarse-grained, only a little kaolinite would be precipitated and the quality of reservoir rocks should be improved. On the other hand, when an opposite situation is to encountered, the kaolinite should be extensively developed in the solution pores, debasing the quality of reservoir rocks.
出处
《矿物学报》
CAS
CSCD
北大核心
2005年第4期367-373,共7页
Acta Mineralogica Sinica
基金
973项目(2005CB422103)
"十五"国家科技攻关项目(2003BA613A-03)
关键词
高岭石
储层物性
含油气流体
水岩反应
准噶尔盆地
kaolinite
quality of reservoir rocks
petroleum-bearing fluid
water-rock interaction
Junggar Basin
