准噶尔盆地乌尔禾油田凝灰质岩成因及储层特征
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摘要
基于岩石薄片、铸体照片、岩心、测井和地震资料等分析,对准噶尔盆地乌尔禾油田二叠系乌尔禾组特殊凝灰质岩成因及储集特征进行详细分析。岩石类型包括凝灰岩、沉凝灰岩和凝灰质砂砾岩;电测曲线呈现高电阻率、低声波时差的电性特征。分析表明,乌尔禾组凝灰质岩成因环境为封闭-半封闭的湖湾环境,由火山灰与正常陆源碎屑物混合堆积、固结成岩。同生期高盐度、碱性水介质条件为火山灰水解蚀变提供物质基础,形成云化(沉)凝灰岩,并析出方沸石。储集空间包括溶蚀孔隙、泄水道孔和裂缝。双孔介质特征改善了储层的储集性能,对油气富集起重要控制作用,控制了油藏分布及油藏规模。
Based on analyses of thin section,core observation,logging and seismic data,we studied the genesis of tuffaceous rocks and their reservoir features in the Permian Wuerhe Formation in Wuerhe Oilfield,Junggar Basin.The rocks can be classified into tuff,tuffites and tuffaceous sandstone and conglomerate and show high resistivity and low interval transit time in logging curves.The study shows that the sedimentary environment of the Formation is enclosed or semi-enclosed lake bay,and the sediments are composed mainly of volcanic ash and terrigenous clastics.Syngenetic high-salinity and alkaline water body provided favorable conditions for hydrolysis and alteration of the deposited volcanic ash.During the process,dolomitic tuffites were formed and analcite was precipitated.These rocks have different reservoir space(dual porosity media),including dissolved vugs,sluiceway and fractures.The dual porosity feature of the rocks improves the poroperm characteristics and controls the accumulation and distribution of hydrocarbons in Wuerhe oilfied.
Based on analyses of thin section,core observation,logging and seismic data,we studied the genesis of tuffaceous rocks and their reservoir features in the Permian Wuerhe Formation in Wuerhe Oilfield,Junggar Basin.The rocks can be classified into tuff,tuffites and tuffaceous sandstone and conglomerate and show high resistivity and low interval transit time in logging curves.The study shows that the sedimentary environment of the Formation is enclosed or semi-enclosed lake bay,and the sediments are composed mainly of volcanic ash and terrigenous clastics.Syngenetic high-salinity and alkaline water body provided favorable conditions for hydrolysis and alteration of the deposited volcanic ash.During the process,dolomitic tuffites were formed and analcite was precipitated.These rocks have different reservoir space(dual porosity media),including dissolved vugs,sluiceway and fractures.The dual porosity feature of the rocks improves the poroperm characteristics and controls the accumulation and distribution of hydrocarbons in Wuerhe oilfied.
引文
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3邱家骧.岩浆岩岩石学[M].北京:地质出版社,2001.172~189
4程日辉,刘万洙,王璞?,等.松辽盆地东缘下白垩统营城组二段火山碎屑沉积的过程、相和结构[J].吉林大学学报(地球科学版),2007,37(6):1 166~1 175
5赵澄林.油区岩相古地理[M].北京:石油工业出版社,2001.53~68
6赵澄林,朱筱敏.沉积岩石学[M].北京:石油工业出版社,2004.253~283
7徐维胜,赵培荣,聂鹏飞,等.石灰岩、白云岩储层孔隙度-渗透率关系研究[J].石油与天然气地质,2008,29(6):806~811
8朱国华.陕北浊沸石次生孔隙砂体的形成与油气关系[J].石油学报,1985,6(1):1~8
9吴胜和,熊琦华.油气储层地质学[M].北京:石油工业出版社,1998.105~154
10李嵘.准噶尔盆地西北缘二叠系储层特征及分类[J].石油与天然气地质,2001,22(1):78~81
11冯明石,刘家铎,孟万斌,等.四川盆地中西部须家河组储层特征与主控因素[J].石油与天然气地质,2009,30(6):713~719
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