准噶尔盆地阜东斜坡区头屯河组低电阻率成因分析
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摘要
头屯河组是准噶尔盆地阜东斜坡带的重要勘探层系,储层岩性以细粒岩屑砂岩为主,储集空间主要为原生孔隙,中孔隙度、中低渗透率及岩石强亲水性的特性,导致储层常常在测井曲线上表现为低电阻率特征。以薄片、扫描电镜观察、X-衍射矿物析、压汞实验析、地层水矿化度分析及岩心常规分析为手段,从储层微观孔隙结构、束缚水饱和度、黏土含量及类型、地层水矿化度变化、含油饱和度特征及钻井液侵入等方面,对研究区头屯河组低电阻率成因及机理进行了分析。结果表明,以伊蒙混层为主要类型的黏土矿物附加导电、局部储层高地层水矿化度、弱成藏动力下的低含油气充满度及长时间的盐水泥浆侵入是造成研究区储层表现为低电阻率的主要原因。
The Toutunhe Formation is an important exploration layer in the Fudong slope zone of the Junggar Basin.The characteristics of the reservoir are as follows:the lithology is dominated by fine-grained lithic sandstone,the reservoir space is mainly primary pores with medium and medium-low permeability,and the rock is strongly hydrophilic.These characteristics result in reservoirs exhibiting a low resistivity response on the well logging.In order to understand the cause and mechanism of low resistivity reservoirs in the study area,this paper studied the microscopic pore structure,irreducible water saturation,clay content and type,formation water salinity change,oil saturation and mud invasion based on the data such as thin section observation,scanning electron microscopy, X-ray diffraction analysis, mercury injection experiment analysis,formation water salinity analysis,and routine analysis of cores.The results show that the reasons for reservoirs with low resistivity in the study area are as follows:the clay types in the study area are mainly illite/smectite,which have additional conductivity;some reservoirs has high formation water salinity;under the condition of weak hydrocarbon accumulation,the filling degree of oil and gas is low;and the time of brine mud invasion is long.
The Toutunhe Formation is an important exploration layer in the Fudong slope zone of the Junggar Basin.The characteristics of the reservoir are as follows:the lithology is dominated by fine-grained lithic sandstone,the reservoir space is mainly primary pores with medium and medium-low permeability,and the rock is strongly hydrophilic.These characteristics result in reservoirs exhibiting a low resistivity response on the well logging.In order to understand the cause and mechanism of low resistivity reservoirs in the study area,this paper studied the microscopic pore structure,irreducible water saturation,clay content and type,formation water salinity change,oil saturation and mud invasion based on the data such as thin section observation,scanning electron microscopy, X-ray diffraction analysis, mercury injection experiment analysis,formation water salinity analysis,and routine analysis of cores.The results show that the reasons for reservoirs with low resistivity in the study area are as follows:the clay types in the study area are mainly illite/smectite,which have additional conductivity;some reservoirs has high formation water salinity;under the condition of weak hydrocarbon accumulation,the filling degree of oil and gas is low;and the time of brine mud invasion is long.
引文
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[3]杨涛涛,王霞,何文昌.低电阻率油气层成因及测井识别评价方法分析[J].油气地球物理,2017,15(4):1-6.
[4]陈清华,王正.苏北盆地低电阻率油气层成因与识别[J].特种油气藏,2008,15(2):11-13.
[5]赵军,宋帆.塔里木盆地低电阻率油层成因分析与评价[J].中国地质大学学报(地球科学版),2004,29(3):317-322.
[6]李令喜,张丽霞,王栋材,等.东濮凹陷胡状集地区低电阻率油层成因分[J].断块油气田.2004,11(4):25-27.
[7]毛志强,朱卫红,汪如军.塔里木盆地油气层低电阻率形成实验(Ⅱ)[J].测井技术,1999,23(6):404-410.
[8]回雪峰,吴锡令,谢庆宾,等.大港油田原始低电阻率油层地质成因分析[J].勘探地球物理进展,2003,26(4):329-332.
[9]郑华,李云鹏,徐锦绣,等.渤海海域低电阻率油层地质成因机理与识别[J].断块油气田,2018,25(1):22-28.
[10]陈清华,孙述鹏,李琴.孤东油田东营组低电阻率油层成因分析[J].中国石油大学学报(自然科学版),2004,28(3):9-12.
[11]赵虹,党犇,姚泾利.鄂尔多斯盆地姬塬地区延长组长2低电阻率油层成因机理[J].石油实验地质,2009,31(6):588-592.
[12]王维斌,郭杜凯,陈旭峰,等.鄂尔多斯盆地吴起地区延长组长61低电阻率油层成因分析及识别方法[J].油气地质与采收率,2017,24(2):38-45.
[13]刘佳庆,康锐,杨传奇,等.鄂尔多斯盆地油房庄南部长4+5低电阻率油层成因分析与识别方法[J].非常规油气,2017,4(2):32-39.
[14]陈世加,高兴军,俞建,等.鄂尔多斯盆地中西部长2油层低电阻率成因分析[J].西南石油大学学报(自然科学版),2017,39(2):1-8.