伊朗卡山地区库姆组储层特征及控制因素分析
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摘要
渐新统—中新统库姆组海相碳酸盐岩是伊朗卡山地区目前最有利的一套储层,且已获得了高产工业油气流。通过钻井、测井、地质、地球物理等方法,对这套储层进行了系统的研究和评价,结果发现,库姆组储层以台地相生物灰岩为主,有效储集空间为溶孔和裂缝,孔隙类型是裂缝+孔隙型,具有双重介质特征。利用地震属性分析、波阻抗反演等方法,对库姆组有利储层的分布进行了平面上的预测,发现有利储层主要分布在断裂、构造发育部位和褶皱的转折端,但平面上和垂向上都具有强非均质性,认为沉积环境、成岩作用和构造活动是控制该区储层发育的3个主要因素。
There are 4 sets of potential reservoirs in the Kashan area in Iran,among them the carbonate reservoir of Qom Formation in Oligocene-Miocene is the most favorable one,and high commercial oil and gas flow was yielded from it.According to drilling,logging,geology,geophysics etc,the reservoir is comprehensively studied and evaluated.Some knowledge is gained as followings: bioclastic limestone in the carbonate platform is the main rock type.Valid pores are solution pore and fracture,pore type is fracture+proe,having double medium feature and serious heterogeneity.According to sedimentary facies and diagenesis,reservoir physical characters are better in well Arn-1,Arn-2,Arn-3 than in well Fkh-1,for fractures are not developed and cemented by shale seriously in the latter.The sedimentary environment of the Qom Formation is turbid water carbonate platform.Grain-shoal,bioclastic shoal and point reef are the most favorable locations for valid reservoirs.Sedimentary environment,diagenesis and tectonic movement are the controlling factors of reservoir development.
There are 4 sets of potential reservoirs in the Kashan area in Iran,among them the carbonate reservoir of Qom Formation in Oligocene-Miocene is the most favorable one,and high commercial oil and gas flow was yielded from it.According to drilling,logging,geology,geophysics etc,the reservoir is comprehensively studied and evaluated.Some knowledge is gained as followings: bioclastic limestone in the carbonate platform is the main rock type.Valid pores are solution pore and fracture,pore type is fracture+proe,having double medium feature and serious heterogeneity.According to sedimentary facies and diagenesis,reservoir physical characters are better in well Arn-1,Arn-2,Arn-3 than in well Fkh-1,for fractures are not developed and cemented by shale seriously in the latter.The sedimentary environment of the Qom Formation is turbid water carbonate platform.Grain-shoal,bioclastic shoal and point reef are the most favorable locations for valid reservoirs.Sedimentary environment,diagenesis and tectonic movement are the controlling factors of reservoir development.
引文
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[2]李政,徐兴友,宋来亮,等.伊朗卡山区块原油地球化学特征[J].石油勘探与开发,2005,32(5):130-133.
[3]孙建孟,王永刚.地球物理资料综合应用[M].东营:石油大学出版社,2001.
[4]徐国强,刘树根,YANG Qinming,等.断层相关裂隙的一种定量计算方法[J].地质学报,2006,80(2):192-195.
[5]Murray G H.Quantitative fracture study-sanish pool,McKenzieCounty,North Dakota[J].AAPG Bulletin,1968,52:57-65.
[6]Wayne,M.Ahr.探索碳酸盐岩油藏之谜[J].谢力译.国外石油动态,2005,201(19):1-15.
[7]周文.裂缝性油气储集层评价方法[M].成都:四川科学技术出版社,1998.
[8]刘和甫.前陆盆地类型及褶皱冲断层样式[J].地学前缘,1995,2(3).59-68.
[9]Mohajjel M,Fergusson C L,Sahandi M R.Cretaceous-Tertia-ry convergence and continental collision,Sanandaj-SirjanZone,western Iran[J].Journal of Asian Earth Sciences,2003,21:397-412.
[10]齐勋.伊朗Kashan区块第三系沉积演化与构造运动分析及储层特征[J].油气地质与采收率,2004,11(4):10-12.
[11]郭海洋,徐国强,夏在连,等.伊朗Kashan地区新生代前陆盆地构造演化特征[J].桂林工程学院学报,2005,25(1):9-13.
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