歧南断阶带明下段低阻油层地质成因
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摘要
为了更好地预测区域内低阻油层分布,以岩心、室内试验数据及薄片资料为基础,对歧南断阶带明下段低阻油层的成因机理及控制因素进行了研究。结果表明:研究区低阻油层成因机理主要包括低幅构造、复杂孔隙结构、黏土矿物附加导电性、砂泥岩薄互层、淡水水入侵及钻井液污染6个方面。低阻油层地质成因包括构造、沉积及成岩作用3个方面,明下段沉积时期频繁而强烈的断层活动导致原生油藏发生淡水水侵,同时形成低幅构造,导致低幅构造型低阻油藏发育。受可容空间与沉积物供给比值变化影响,研究区内发育砂泥薄互层型及复杂孔隙结构型低阻油层。早成岩阶段较弱的成岩作用导致研究区发育黏土矿物附加导电性及钻井液污染型低阻油层。受以上3种因素影响,歧南断阶带明下段地层中低阻油层主要发育于与断层相接的低幅构造区域内的弱水动力区。
In order to better predict the distribution pattern of low resistivity oil layers of the Lower Minghuazhen Formation in the Qinan fault step belt,genetic mechanism and controlling factors of the layers were studied on the basis of core observation,thin section analysis and laboratory testing data.Results show that the genetic mechanism of the low-resistivity oil layers in the Qinan fault step belt depends upon six factors:the low structural amplitude,the complex pore structure,the additive conductivity of clay minerals,the thin sand-shale interbedding,the natural water flooding and the drilling fluid pollution.The geological origin of low resistivity reservoirs includes three aspects:tectonics,sedimentation and diagenesis.Frequent and intense faulting activities lead to natural water flooding and the formation of low amplitude structures.The frequent change in the ratio of accommodation space and sediment supply leads to the formation of the reservoir consisting of thin sand-shale interbedded deposits with complex pore structures.The weak diagenesis of the early diagenetic stage leads to the formation of additive conductivity of clay mineral and drilling fluid pollution.Influenced by the above-mentioned three factors,the low resistivity oil layers of lower Minghuazhen Formation in the Qinan fault step belt mainly develop in the weak hydrodynamic zones of the low amplitude structural areas with connection to faults.
In order to better predict the distribution pattern of low resistivity oil layers of the Lower Minghuazhen Formation in the Qinan fault step belt,genetic mechanism and controlling factors of the layers were studied on the basis of core observation,thin section analysis and laboratory testing data.Results show that the genetic mechanism of the low-resistivity oil layers in the Qinan fault step belt depends upon six factors:the low structural amplitude,the complex pore structure,the additive conductivity of clay minerals,the thin sand-shale interbedding,the natural water flooding and the drilling fluid pollution.The geological origin of low resistivity reservoirs includes three aspects:tectonics,sedimentation and diagenesis.Frequent and intense faulting activities lead to natural water flooding and the formation of low amplitude structures.The frequent change in the ratio of accommodation space and sediment supply leads to the formation of the reservoir consisting of thin sand-shale interbedded deposits with complex pore structures.The weak diagenesis of the early diagenetic stage leads to the formation of additive conductivity of clay mineral and drilling fluid pollution.Influenced by the above-mentioned three factors,the low resistivity oil layers of lower Minghuazhen Formation in the Qinan fault step belt mainly develop in the weak hydrodynamic zones of the low amplitude structural areas with connection to faults.
引文
[1]李振鹏,张国坤,汪跃,等.歧南断阶带沙河街组储层特征及物性主控因素[J].断块油气田,2018,5(3):294-299.
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[13]应凤祥,罗平,何东博,等.中国含油气盆地碎屑岩储集层成岩作用与成岩数值模拟[M].北京:石油工业出版社,2004.
[14]杨春梅.油田开发中后期测井响应变化机理及储层性质研究[D].北京:中国石油大学(北京),2005.
[15]尹旭,彭仕宓,陈建文,等.低阻油层判别技术在吉林油区的应用[J].大庆石油地质与开发,2008,27(1):126-129.
[16]王博,赵军,王淼,等.断块低阻油层测井识别与评价[J].岩性油气藏,2012,24(6):110-114.
[17]张国良,陈国童.歧口凹陷断裂对油气运聚的控制作用[J].中国海上油气(地质),1996,10(5):290-296.
[18]祁鹏,任建业,艾能平,等.歧口凹陷后裂陷期构造特征与浅层油气成藏[J].石油地球物理勘探,2011,46(6):970-977.
[19]应凤祥,何东博,龙玉梅,等.SY/T 5477—2003碎屑岩成岩阶段划分[S].北京:石油工业出版社,2003.
[20]李振鹏,黄建廷,曲炳昌,等.渤海海域歧南断阶带明下段河湖交替相沉积[J].科学技术与工程,2018,18(4):255-262.
[2]曾文冲,欧阳健,何登春.测井地层分析与油气评价[M].北京:石油工业出版社,1987:45-51.
[3]孙建孟,陈钢花,杨玉征.低阻油气层评价方法[J].石油学报,1998,19(3):83-88.
[4]赵国欣.改进的双水模型在曲堤油田低电阻油层中的应用[J].油气地质与采收率,2008,15(6):39-51.
[5]单祥,季汉成,刘计国,等.尼日尔Agadem区块古近系Sokor1组低阻油层成因[J].东北石油大学学报,2014,38(2):27-33.
[6]齐颖,黎小伟.J油田低阻油层成因的微观机理[J].海洋地质前沿,2014,30(8):42-46.
[7]李振鹏.歧南断阶带沙一段湖底扇沉积及砂体展布特征[J].特种油气藏,2018,25(5):51-55.
[8]桑华.渤海油田低阻油气藏测井识别评价方法研究[D].青岛:中国石油大学(华东),2008.
[9]杨春梅.临南洼陷深层碎屑岩次生孔隙特征及其地质意义[J].断块油气田,2008,15(6):1-4.
[10]林景晔,许利群,杨辉.石油聚集成藏的物理学原理——毛-浮方程[J].大庆石油地质与开发,2008,27(1):22-25.
[11]杨通佑.石油及天然气储量计算方法[M].北京:石油工业出版社,1987:87-108.
[12]付明世,李文海,贾瑞忠,等.文留油气田滚动勘探开发研究[J].特种油气藏,2005,12(3):14-17.
[13]应凤祥,罗平,何东博,等.中国含油气盆地碎屑岩储集层成岩作用与成岩数值模拟[M].北京:石油工业出版社,2004.
[14]杨春梅.油田开发中后期测井响应变化机理及储层性质研究[D].北京:中国石油大学(北京),2005.
[15]尹旭,彭仕宓,陈建文,等.低阻油层判别技术在吉林油区的应用[J].大庆石油地质与开发,2008,27(1):126-129.
[16]王博,赵军,王淼,等.断块低阻油层测井识别与评价[J].岩性油气藏,2012,24(6):110-114.
[17]张国良,陈国童.歧口凹陷断裂对油气运聚的控制作用[J].中国海上油气(地质),1996,10(5):290-296.
[18]祁鹏,任建业,艾能平,等.歧口凹陷后裂陷期构造特征与浅层油气成藏[J].石油地球物理勘探,2011,46(6):970-977.
[19]应凤祥,何东博,龙玉梅,等.SY/T 5477—2003碎屑岩成岩阶段划分[S].北京:石油工业出版社,2003.
[20]李振鹏,黄建廷,曲炳昌,等.渤海海域歧南断阶带明下段河湖交替相沉积[J].科学技术与工程,2018,18(4):255-262.