K油田白垩系低阻油层成因及识别方法研究
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摘要
以地震、测井、岩心化验分析及试油试采成果为基础,从构造、沉积及储层特征等方面研究认为,哈萨克斯坦的K油田白垩系低阻油层的主要影响因素依次为低构造幅度、弱沉积水动力条件及高黏土矿物含量等。针对成因类型,分析了相同沉积环境、相似物性条件下油层段电阻率与其距自由水面高度差之间的关系,根据电阻率递减规律分析其地质影响因素并提出应分段确定油层的电阻率下限值,以消除油水分异作用的影响;同时结合电阻率比值法,对低阻油层进行综合判别。综合分析认为,K油田低阻油层纵向上主要位于构造相对低部位或沉积旋回正韵律的上部,平面上多分布于沉积水动力条件弱的三角洲前缘亚相水下分流河道末端和席状砂微相。
According to the results of seismic,well logging,core analysis data formation testing,the study of structure,sediment and reservoir characteristics indicated that the major influential factors included low structural scope,weak sedimentary hydrodynamic environment and high clay mineral volume,etc in the low-resistivity reservoirs of Cretaceous in K Oilfield.On the basis of genetic types,the relationship between the resistivity of oil zones with similar properties and the height deviation above oil-water contact deposited in the same sedimentary environment,and it presented that the low limit of resistivity of oil zone should be distinguish for different depth intervals in order to decrease the influences caused by gravity differentiation,and the resistivity ratio methods are also used to identify oil zone.The low-resistivity reservoir distributes in subsea distributary channel terminal or sandsheet deposited in weak hydrodynamic environment laterally,while it is located in the lower tectonic setting or the upper of positive rhythm vertically.
According to the results of seismic,well logging,core analysis data formation testing,the study of structure,sediment and reservoir characteristics indicated that the major influential factors included low structural scope,weak sedimentary hydrodynamic environment and high clay mineral volume,etc in the low-resistivity reservoirs of Cretaceous in K Oilfield.On the basis of genetic types,the relationship between the resistivity of oil zones with similar properties and the height deviation above oil-water contact deposited in the same sedimentary environment,and it presented that the low limit of resistivity of oil zone should be distinguish for different depth intervals in order to decrease the influences caused by gravity differentiation,and the resistivity ratio methods are also used to identify oil zone.The low-resistivity reservoir distributes in subsea distributary channel terminal or sandsheet deposited in weak hydrodynamic environment laterally,while it is located in the lower tectonic setting or the upper of positive rhythm vertically.
引文
[1]中国石油勘探与生产公司.低阻油气藏测井识别评价方法与技术[M].北京:石油工业出版社,2006.
[2]赵军,宋帆.塔里木盆地低电阻率油层成因分析与评价[J].石油勘探与开发,2004,31(6):69～71.
[3]鲁国明.东营凹陷深层砂砾岩岩性测井综合识别技术[J].测井技术,2010,34(2):168～171.
[4]周凤鸣,司兆伟,马越蛟,等.南堡凹陷低电阻率油气层综合识别方法[J].石油勘探与开发,2008,35(6):680～684.
[5]赵虹,党犇,姚泾利,等.鄂尔多斯盆地姬塬地区延长组长2低阻油层成因机理[J].石油实验地质,2009,31(6):588～592.
[6]欧阳健,毛志强,修立军,等.测井低对比度油层成因机理与评价方法[M].北京:石油工业出版社,2009.
[7]张龙海,周灿灿,刘国强,等.孔隙结构对低孔低渗储集层电性及测井解释评价的影响[J].石油勘探与开发,2006,33(6):671～676.
[8]Clavier C G,Dumanior J.The theoretical and experimental bases for the“Dual Water”model for the interpretation of shaly sands[J].SPE6859,1977.
[2]赵军,宋帆.塔里木盆地低电阻率油层成因分析与评价[J].石油勘探与开发,2004,31(6):69～71.
[3]鲁国明.东营凹陷深层砂砾岩岩性测井综合识别技术[J].测井技术,2010,34(2):168～171.
[4]周凤鸣,司兆伟,马越蛟,等.南堡凹陷低电阻率油气层综合识别方法[J].石油勘探与开发,2008,35(6):680～684.
[5]赵虹,党犇,姚泾利,等.鄂尔多斯盆地姬塬地区延长组长2低阻油层成因机理[J].石油实验地质,2009,31(6):588～592.
[6]欧阳健,毛志强,修立军,等.测井低对比度油层成因机理与评价方法[M].北京:石油工业出版社,2009.
[7]张龙海,周灿灿,刘国强,等.孔隙结构对低孔低渗储集层电性及测井解释评价的影响[J].石油勘探与开发,2006,33(6):671～676.
[8]Clavier C G,Dumanior J.The theoretical and experimental bases for the“Dual Water”model for the interpretation of shaly sands[J].SPE6859,1977.
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