九台营城组凝灰岩蚀变机理及对储集性能影响  被引量:2

Alteration mechanism and its influences upon enriching properties of the tuff in Yingcheng Formation of Jiutai

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作  者:许中杰[1] 程日辉[1] 刘万洙[1] 白雪峰[1,2] 王加强[1,2] 

机构地区:[1]吉林大学地球科学学院,吉林长春130061 [2]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712

出  处:《大庆石油地质与开发》2008年第6期31-34,共4页Petroleum Geology & Oilfield Development in Daqing

基  金:国家"973"项目(2006CB701403)资助

摘  要:九台营城煤矿区营城组凝灰岩类型多样,按成分分为岩屑晶屑凝灰岩、含角砾岩屑晶屑凝灰岩和含角砾玻屑凝灰岩;按结构分为层状凝灰岩和块状凝灰岩;按蚀变程度分为凝灰岩、弱蒙脱石化凝灰岩和膨润土。研究区碱性水介质是在凝灰岩成岩后期参与到蚀变过程中的,蚀变初期以硅化为主,后期以蒙脱石化为主,凝灰岩岩石学特征和水介质酸碱度是影响蚀变的主要因素。与松辽盆地徐家围子、九台官马山营一段D1井岩石物性对比分析认为,该区凝灰岩储集性低,为Ⅳ类储层,具有随蚀变程度加强储集性能大大降低的特征。There are many types of tuff in Yingcheng Formation in the Yingcheng coalfield of Jiutai City. According to the composition classification, there are lithic crystal tuff, breccia-bearing lithic crystal tuff and breccia-bearing vitric tuff. According to the composition, they can be divided into laminar tuff and massive tuff; according to the alteration degree, they can be classified into tuff, weak montmorillonite dehydration-type tuff and bentonite. In the studied region, alkaline water media takes part in alteration process in the late stage of tuff diagenesis, at the beginning of the process it takes silication as main form and in the late period changes into montmorillonite dehydration, tuff petrologic characteristics and water media' s PH value are the main factors to influence the alteration. Comparing and analyzing with rock physical features of Xujiaweizi of Songliao Basin and well DI in Ying No. 1 Member of Guanma Mountain in Jiutai, the tuff in this region is thought to be poor gathering capacity ( type Ⅳ reservoir) and have the characteristics of the above capacity reduced with the strength of aheration degree.

关 键 词:九台 营城组 凝灰岩 蚀变 蚀变机理 

分 类 号:TE121[石油与天然气工程—油气勘探]

 

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