摘要
花港组储层作为西湖凹陷的主要油气储层之一,其储集岩主要为长石岩屑砂岩和岩屑长石砂岩,少部分长石石英砂岩和岩屑石英砂岩,具有中—低孔、低—特低渗特征.通过岩石薄片鉴定（431块）、扫描电镜（20块）、薄片粒度（106块）、地层水分析（8块）和黏土矿物X衍射（78块）等资料分析认为,成岩环境在影响了水岩反应及次生孔隙的发育.花港组上部（2 500 ～3 300 m）以酸性成岩环境为主,以长石溶蚀形成自生高岭石、石英次生加大和次生溶孔为特征;花港组下部（3 300～4 000 m）以碱性还原环境为主,菱铁矿等碳酸盐胶结物的大量出现,高岭石转化为伊利石、绿泥石,是造成孔隙度,特别是渗透率降低的主要原因.
Huagang Formation is one of the main oil-gas reservoirs in Xihu depression. These reservoir rocks are mainly feldspar-lithic sandstone and lithic-feldspar sandstone, a few feldspar-quartz sandstone and lithic-quartz sandstone, with medium-low porosity, low-extra low permeability. The diagenetic environment results in different water-rock reaction and development of secondary porosity by according to thin-section identification, scanning electron microscopy , grain size analysiscast, formation water salinity and X ray diffraction. Upper Huagang group （2 500 -3 300 m） in acidic diagenetic environment,the feldspar corrosion formed authigenic kaolinite, kiesel and dissolved pore. Lower Huagang group （3 300 - 4 000 m） in alkaline environment, these emergences of a large number of carbonate cementation, kaolinite into illite and chlorite, are caused by porosity, especially permeability reduction.
出处
《科学技术与工程》
北大核心
2014年第10期11-15,54,共6页
Science Technology and Engineering
关键词
西湖凹陷
花港组
成岩环境
Xihu depression Huagang formation diagenetic environment
作者简介
郭凯伟（1987-），男，湖北天门人，硕士研究生。研究方向：油气田开发地质专业。E-mail：1013215314@qq．com。
