鄂尔多斯盆地华庆地区长8_1成岩作用特征研究  

DIAGENESIS OF CHANG 8_1 RESERVOIR,HUAQING AREA,ORDOS BASIN

作　　者：孔祥超[1] 赵俊兴[1,2] 申赵军[1] 

机构地区：[1]成都理工大学沉积地质研究院 [2]"油气藏地质及开发工程"国家重点实验室.成都理工大学

出　　处：《天然气勘探与开发》2013年第1期12-15,19,共5页Natural Gas Exploration and Development

摘　　要：通过对研究区砂岩扫描电镜、铸体薄片及物性资料的分析,认为华庆地区长81砂岩类型以岩屑长石砂岩、长石岩屑砂岩为主,碎屑颗粒具有分选中等、磨圆差、成分成熟度低、结构成熟度高的特点,为典型的低孔、低渗储层;对储层成岩作用研究表明,压实作用和胶结作用强烈破坏了砂岩的原生孔隙,绿泥石胶结对原生孔隙起到一定的保护作用,溶蚀作用与破裂作用有效的改善了储层的孔隙结构;建立了该地区成岩作用演化序列,认为长81储层砂岩的成岩阶段处于晚成岩A期。Based on the analysis on scanning electron microscope,casting thin section and physical property for Chang 81 sandstone of Huanqing area,it is considered that(1) this reservoir is mainly composed of lithic arkose and feldspathic litharenite;(2) their clastic particles are mid-sorted and under-rounded,featured by low component maturity and high structure maturity;and(3) it is a typical low-porosity and low-permeability reservoir.In addition,a study on diagenesis is carried out which shows that both compaction and cementation may destroy the primary pores intensively whereas chlorite cementation can protect them to a certain degree,and dissolution and cataclasis can also improve the pore structure effectively.After establishing an evolution sequence of diagenesis in this area,it is considered that Chang 81 sandstone reservoir is in diagenetic A phase.

关 键 词：成岩作用 华庆地区 长81储层砂岩 鄂尔多斯盆地 绿泥石 

分 类 号：P618.13[天文地球—矿床学]