塔里木盆地群6井泥盆系东河塘组下段砂岩储层特征及非均质性影响因素  

Reservoir Characteristics and Influential Factors of Heterogeneity of Lower Member Sandstones in Devonian Donghetang Formation at Qun 6 Well

作　　者：王月华[1] 李勇[1] 王利刚[1] 孙玉善[1] 张现军[1] 曾昌民[1] 

机构地区：[1]中国石油塔里木油田公司勘探开发研究院,新疆库尔勒市841000

出　　处：《中国石油勘探》2010年第3期17-21,共5页China Petroleum Exploration

摘　　要：群6井泥盆系东河塘组下段砂岩主要为极细砂质细粒、细粒岩屑石英砂岩,砂岩成熟度较高,总体为一套低孔低渗储层。储层厚度大,但非均质性强。根据岩心和镜下对纹层的目估,砂岩中致密和较致密的纹层密度最多达100个/m以上。影响储层非均质性的因素除了压实作用、溶蚀作用之外,储层微沉积构造发育、白云石(铁白云石)胶结及重质沥青充填都使储层非均质性增强、渗透率降低,油气的流动性变差。东河塘组下段砂岩从上至下沥青在孔隙中的分布明显减少,非均质层也明显减少,中下部较均匀的块状砂岩是有利储层。The Lower Member sandstones in Devonian Donghetang Formation at Qun 6 well are made up of micro fine and fine lithoclastic quartz sandstones.It is a suit of high maturity,low porosity and low permeability reservoirs.The reservoirs have huge thickness and significant heterogeneity.According to the statistics of cores and thin-sections under microscope,the density of dense and semi-dense laminae in the sandstones sometimes attain one hundred or more per meter.The influential factors of heterogeneity in the reservoirs include syndepositional structures,dolomite cementation,filled with heavy bitumen except compaction and dissolution.These factors lead to low permeability and low oil-fluidity in the sandstones.The contents of bitumen and heterogeneity increase obviously from top to bottom the sandstones in Lower Member of Donghetang Formation.The more uniform block sandtones at lower and middle parts are favorable reservoirs.

关 键 词：塔里木盆地 群6井 东河塘组 储层特征 非均质性 

分 类 号：TE112.23[石油与天然气工程—油气勘探]