银额盆地天草凹陷下白垩统储层特征及影响  

The Characteristics and Affecting Factors of Lower Cretaceous Reservoir in Tiancao Depression,Yingen-Ejinnaqi Basin

作　　者：林卫东[1] 郝银全[2] 

机构地区：[1]中国石油化工股份有限公司石油勘探开发研究院 [2]中国石油勘探开发研究院

出　　处：《甘肃科学学报》2007年第4期50-54,共5页Journal of Gansu Sciences

基　　金：中国石油"十五"油气勘探科技工程项目(200204-06)

摘　　要：天草凹陷下白垩统储层岩石类型以长石岩屑砂岩为主，岩屑含量高，长石次之，石英含量最低，成分成熟度和结构成熟度低，胶结物主要为方解石，次为泥质．储层的孔隙类型有粒间充填剩余孔、次生孔隙、晶间微孔及微裂缝，以次生孔隙为主．孔隙度集中在3％～15％内，渗透率以小于1×10^-3μm。为主，属于低孔特低渗储层，孔隙和喉道的配置关系较差，喉道较细，产出能力较低，但在局部层段发育孔隙结构较好的中高渗储层．沉积相、碎屑组成、压实作用、碳酸盐胶结作用以及方解石、长石和岩屑等的溶蚀对储层性能有重要影响．The reservoir rock type of Lower Cretaceous age in Tiancao depression of Yingen-Ejinaqi basin consisteds mainly of feldspar litharenite which is characterized by high contents of lithic debris, by lass for feldspar and least for quartz. Both the compositional and textural structures are low. The cements are mainly calcite. The secondary pore are predominant among residual intergranual pores, secondary solution pores , intercrystal pores and micro fissures. The reservoir is of low porosity （between 3% and 5%）and and litharenite are the key factors affecting reservoir quality.

关 键 词：天草凹陷 下白垩统 储层特征 影响因素 

分 类 号：TE122.1[石油与天然气工程—油气勘探]