西南石油大学学报(自然科学版)

• 地质勘探 • 上一篇    下一篇

鄂尔多斯盆地姬塬地区长9 油层组成岩相特征

向芳,陈康,李凤杰,孟繁星,孟立娜   

  1. 成都理工大学沉积地质研究院,四川成都610059
  • 出版日期:2013-10-20 发布日期:2013-10-20

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

Xiang Fang, Chen Kang, Li Fengjie, Meng Fanxing, Meng Lina   

  1. Institute of Sedimentary Geology,Chengdu University of Technology,Chengdu,Sichuan 610059,China
  • Online:2013-10-20 Published:2013-10-20

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。

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

Abstract:

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 influence
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 intragranular
pore diagenetic facies,which are connected with distributary channel sand body,are the most advantageous diagenetic
facies in the area.

Key words: Jiyuan area, Chang 9 oil-bearing layer, characteristics of reservoir, diagenetic process, diagenetic facies division