鄂尔多斯盆地姬塬地区长9油层组成岩相特征  

Diagenetic Facies Characteristics of the Chang 9 Oil-bearing Layer of the Upper Triassic Yanchang Formation in the Jiyuan Area,Ordos Basin

作　　者：向芳[1] 陈康[1] 李凤杰[1] 孟繁星[1] 孟立娜[1] 

机构地区：[1]成都理工大学沉积地质研究院,四川成都610059

出　　处：《西南石油大学学报（自然科学版）》2013年第5期23-30,共8页Journal of Southwest Petroleum University(Science & Technology Edition)

摘　　要：在综合研究的基础上,对姬塬地区长9油层组的储层特征、成岩特征和成岩相特征进行了研究。结果表明:(1)研究区长9油层组储层主要为粒度较粗的长石砂岩、岩屑长石砂岩,杂基含量较少,以绿泥石和浊沸石胶结物为主,储集空间以粒间孔和粒内溶孔为主;(2)储集砂岩目前主要处于中成岩A期—B期,弱的压实作用、胶结物和自生矿物有限充填作用和较为发育的长石和浊沸石溶蚀作用,对原生粒间孔的保留和次生孔隙的形成具有重要影响;(3)将该区划分出浊沸石溶蚀相、绿泥石环边残余粒间孔相和硅质胶结相,其分布与物源供给、沉积特征和水动力作用有关;(4)该区最为有利的成岩相为与分流河道砂体相关的绿泥石环边残余粒间孔相和浊沸石溶蚀相。On the basis of comprehensive research, the characteristics of reservoir, diagenetic process and diagenetic facies of Chang 9 oil-bearing layer in Jiyuan area can be researched. The results indicate that： （1） the reservoir sandstones of the Chang 9 oil-bearing layer are mainly composed of coarser feldspar sandstones and lithic-feldspathic sandstones. Cementing materials are mainly chlorite and laumontite and matrix content is less. Reservoir spaces are mainly intergranular pores and intragranular dissolved pores; （2） reservoir sandstones are in the A to B stage of middle diagenetic phase. Weak compaction, limited filling of cements materials and authigenic minerals, and feldspar and laumontite dissolution have very important influ- ence on retention of original intergranular pores and forming of secondary dissolved pores ; （3） three diagenetic facies can be divided： laumontite intragranular pore diagenetic facies, rim chlorite residual intergranular pore diagenetic facies and siliceous cementation diagenetic facies. The distribution of these diagenetic facies is related to supply of material sources, sedimentary characteristics and water dynamic action; （4） rim chlorite residual intergranular pore diagenetic facies and laumontite intra- granular pore diagenetic facies, which are connected with distributary channel sand body, are the most advantageous diagenetic facies in the area.

关 键 词：姬塬地区 长9油层组 储层特征 成岩作用 成岩相划分 

分 类 号：TE122[石油与天然气工程—油气勘探]