泥页岩热演化所排有机酸对长石的溶蚀作用——以大民屯凹陷沙四段为例
|
摘要
针对泥页岩热演化生成的有机酸对储层改造的问题,以Ⅱ1型干酪根所排有机酸和长石为研究对象,通过水岩模拟实验,从有机酸对长石的溶蚀特征及其对储层的贡献的角度进行研究。通过分析实验前后长石质量变化、长石表面形态特征以及反应后溶液中离子浓度变化,明确有机酸对长石溶蚀的特征,并结合工区泥页岩储层矿物组成分析有机酸对长石的溶蚀作用和对次生孔隙的贡献。结果表明,长石的溶蚀首先沿着晶面溶蚀,而后沿着矿物解理面溶蚀,最后沿矿物边缘溶蚀,并且斜长石的溶蚀强度要大于钾长石,虽然在长石与有机酸的反应过程中会生成水铝矿、绿泥石及伊利石等新矿物并充填于孔隙之间,但长石溶蚀能够形成大量次生孔隙,改善储层物性,提高孔隙率,经计算,长石溶蚀最高可以增加12.87%的面孔率。
Aiming at the problem of reservoir reformation caused by the thermal evolution of mud shale,taking the feldspar and organic acid discharged by typeⅡ1 kerogen as the study object through the water rock simulation experiment to study the dissolution characteristics of feldspar which caused by organic acid and its contribution to the reservoir.By analyzing the mass change of feldspar before and after the experiment and the surface morphology of the feldspar and the change of ion concentration in the solution after the reaction to understanding the characteristics of the dissolution of feldspar which caused by organic acids.And combined with the mineral composition of mud shale reservoirs to analysis the dissolution of feldspar by organic acids and its contribution to secondary pores in the work area.The results show that the feldspar first dissolves along its crystal plane,and then the feldspar will dissolve along the mineral cleavage surface.Finally,the feldspar will dissolve along the mineral edge,and the dissolution strength of plagioclase is greater than that of potassium feldspar.Although new minerals such as gibbsite,chlorite and illite are formed during the reaction of feldspar with organic acids and filled between pores but feldspar dissolution can form a large number of secondary pores to improve reservoir properties and increase porosity.After calculation,feldspar dissolution can increase a maximum of 12.87% of the face rate.
Aiming at the problem of reservoir reformation caused by the thermal evolution of mud shale,taking the feldspar and organic acid discharged by typeⅡ1 kerogen as the study object through the water rock simulation experiment to study the dissolution characteristics of feldspar which caused by organic acid and its contribution to the reservoir.By analyzing the mass change of feldspar before and after the experiment and the surface morphology of the feldspar and the change of ion concentration in the solution after the reaction to understanding the characteristics of the dissolution of feldspar which caused by organic acids.And combined with the mineral composition of mud shale reservoirs to analysis the dissolution of feldspar by organic acids and its contribution to secondary pores in the work area.The results show that the feldspar first dissolves along its crystal plane,and then the feldspar will dissolve along the mineral cleavage surface.Finally,the feldspar will dissolve along the mineral edge,and the dissolution strength of plagioclase is greater than that of potassium feldspar.Although new minerals such as gibbsite,chlorite and illite are formed during the reaction of feldspar with organic acids and filled between pores but feldspar dissolution can form a large number of secondary pores to improve reservoir properties and increase porosity.After calculation,feldspar dissolution can increase a maximum of 12.87% of the face rate.
引文
[1]SCHMOKER J W.Resource assessment perspectives for unconventional gas systems[J].AAPG Bulletin,2002,86(11):1993-1999.
[2]LAW B E,CURTIS J B.Introduction to unconventional petroleum systems[J].AAPG Bulletin,2002,86(11):1851-1852.
[3]邹才能,朱如凯,吴松涛,等.常规与非常规油气聚集类型、特征、机理及展望---以中国致密油和致密气为例[J].石油学报,2012,33(2):173-187.ZOU Caineng,ZHU Rukai,WU Songtao,et al.Types,characteristics,genesis and prospects of conventional hydrocarbon accumulations:taking tight oil and tight gas in China as an instance[J].Acta Petrolei Sinica,2012,33(2):173-187.(in Chinese)
[4]SURDAM R C,BOESE S W,CROSSEY L J.The chemistry of secondary porosity[J].AAPG Memoir,1984,37(2):183-200.
[5]吴少波,赵靖舟,罗继红,等.子长油田上三叠统长2油层组储层成岩作用及物性的影响因素[J].西安石油学院学报(自然科学版),2003,18(4):7-10.WU Shaobo,ZHAO Jingzhou,LUO Jihong,et al.Diagenesis of Chang2reservoir of Upper Triassic Series in Zichang oilfield and the factors of influencing the physical property of the reservoir[J].Journal of Xi’an Petroleum Institute(Natural Science Edition),2003,18(4):7-10.(in Chinese)
[6]柳波,迟亚奥,黄志龙,等.三塘湖盆地马朗凹陷二叠系油气运移机制与页岩油富集规律[J].石油与天然气地质,2013,34(6):725-730.LIU Bo,CHI Yaao,HUANG Zhilong,et al.Migration mechanism of the Permian hydrocarbon and shale oil accumulation in Malang sag,the Sangtanghu basin[J].Oil&Gas Geology,2013,34(6):725-730.(in Chinese)
[7]GOUT R,OELKERS E H,SCHOTT J,et al.The suiface chemistry and structure of acid-leached albite:new insights on the dissolution mechanism of the alkali feldspars[J].Geochim.et Cosmochim.Acta,1997,61(7):3013-3018.
[8]吴林钢,李秀生,郭小波,等.马朗凹陷芦草沟组页岩油储层成岩演化与溶蚀孔隙形成机制[J].中国石油大学学报(自然科学版),2012,36(3):38-43,53.WU Lingang,LI Xiusheng,GUO Xiaobo,et al.Diagenetic evolution and formation mechanism of dissolved pore of shale oil reservoirs of Lucaogou formation in Malang sag[J].Journal of China University of Petroleum,2012,36(3):38-43,53.(in Chinese)
[9]远光辉,操应长,葸克来,等.东营凹陷北带古近系碎屑岩储层长石溶蚀作用及其物性响应[J].石油学报,2013,34(5):853-866.YUAN Guanghui,CAO Yingchang,XI Kelai,et al.Feldspar dissolution and its impact on physical properties of Paleogene clastic reservoirs in the northern slope zone of the Dongying sag[J].Acta Petrolei Sinica,2013,34(5):853-866.(in Chinese)
[10]季汉成,徐珍.深部碎屑岩储层溶蚀作用实验模拟研究[J].地质学报,2007,81(2):212-219.JI Hancheng,XU Zhen.Experimental study on dissolution of deep clastic reservoir[J].Acta Geologica Sinica,2007,81(2):212-219.(in Chinese)
[11]BLAKE R E,WALTER L M.Effects of organic acids on the dissolution of orthoclase at 80℃and pH 6[J].Chemical Geology,1996,132(10):91-102.
[12]黄福堂,邹信方,张作祥.地层水中主要酸类对储层物性影响因素研究[J].大庆石油地质与开发,1998,17(3):7-9.HUANG Futang,ZOU Xinfang,ZHANG Zuoxiang.Study on the factors affecting the physical properties of main acids in formation water[J].Petroleum Geology&Oilfield Development in Daqing,1998,17(3):7-9.(in Chinese)
[13]李建华,宋兵,耿辉,等.大民屯凹陷构造油气藏有利分布区定量预测[J].断块油气田,2012,19(2):137-141.LI Jianhua,SONG Bing,GENG Hui,et al.Quantitative prediction of favorable distribution area of structural pools in Damintun depression[J].Fault-Block Oil&Gas Field,2012,19(2):137-141.(in Chinese)
[14]马满兴.大民屯凹陷油页岩层段储集性能研究[J].岩性油气藏,2013,25(5):37-43.MA Manxing.Study on the reservoir properties of the interval of oil shale in Damintun depression[J].Lithologic Reservoirs,2013,25(5):37-43.(in Chinese)
[15]赵明,季峻峰,陈振岩,等.大民屯凹陷古近系高岭石亚族和伊/蒙混层矿物特征与盆地古温度[J].中国科学:地球科学,2011,41(2):169-180.ZHAO Ming,JI Junfeng,CHEN Zhenyan,et al.Mineral characteristics of the kaolinite subfamily and I/Mmixed layer in the Paleogene of the Damintun depression and the ancient temperature of the basin[J].Science China Earth Sciences,2011,41(2):169-180.(in Chinese)
[16]叶加仁,郝芳,陈建渝.辽河盆地大民屯凹陷流体动力场特征[J].石油与天然气地质,2001,22(2):128-132.YE Jiaren,HAO Fang,CHEN Jianyu.Characteristics of hydrodynamic field in Damintun depression,Liaohe basin[J].Oil&Gas Geology,2001,22(2):128-132.(in Chinese)
[17]蔡进功,谢忠怀,田芳,等.济阳坳陷深层砂岩成岩作用及孔隙演化[J].石油与天然气地质,2002,23(1):84-88.CAI Jingong,XIE Zhonghuai,TIAN Fang,et al.Diagenesis and pore evolution of deep sandstone in Jiyang depression[J].Oil&Gas Geology,2002,23(1):84-88.(in Chinese)
[18]李汶国,张晓鹏,钟玉梅.长石砂岩次生溶孔的形成机理[J].石油与天然气地质,2005,26(2):220-223.LI Wenguo,ZHANG Xiaopeng,ZHONG Yumei.Formation mechanism of secondary dissolved pores in arcose[J].Oil&Gas Geology,2005,26(2):220-223.(in Chinese)
[19]康逊,胡文瑄,曹剑,等.钾长石和钠长石差异溶蚀与含烃类流体的关系-以准噶尔盆地艾湖油田百口泉组为例[J].石油学报,2016,37(11):1381-1393.KANG Xun,HU Wenxuan,CAO Jian,et al.Relationship between hydrocarbon bearing fluid and the differential corrosion of potash feldspar and albite:a case study of Baikouquan formation in Aihu oilfield,Junggar basin[J].Acta Petrolei Sinica,2016,37(11):1381-1393.(in Chinese)
[20]于川淇,宋晓蛟,李景景,等.长石溶蚀作用对储层物性的影响---以渤海湾盆地东营凹陷为例[J].石油与天然气地质,2013,34(6):765-770.YU Chuanqi,SONG Xiaojiao,LI Jingjing,et al.Impact of feldspar dissolution on reservoir physical properties:a case from Dongying sag,the Bohai Bay basin[J].Oil&Gas Geology,2013,34(6):765-770.(in Chinese)
[21]黄思静,杨俊杰,张文正,等.不同温度条件下乙酸对长石溶蚀过程的实验研究[J].沉积学报,1995,13(1):7-17.HUANG Sijing,YANG Junjie,ZHANG Wenzheng,et al.Experimental study on dissolution of feldspar by acetic acid at different burial temperature[J].Acta Sedimentologica Sinica,1995,13(1):7-17.(in Chinese)
[2]LAW B E,CURTIS J B.Introduction to unconventional petroleum systems[J].AAPG Bulletin,2002,86(11):1851-1852.
[3]邹才能,朱如凯,吴松涛,等.常规与非常规油气聚集类型、特征、机理及展望---以中国致密油和致密气为例[J].石油学报,2012,33(2):173-187.ZOU Caineng,ZHU Rukai,WU Songtao,et al.Types,characteristics,genesis and prospects of conventional hydrocarbon accumulations:taking tight oil and tight gas in China as an instance[J].Acta Petrolei Sinica,2012,33(2):173-187.(in Chinese)
[4]SURDAM R C,BOESE S W,CROSSEY L J.The chemistry of secondary porosity[J].AAPG Memoir,1984,37(2):183-200.
[5]吴少波,赵靖舟,罗继红,等.子长油田上三叠统长2油层组储层成岩作用及物性的影响因素[J].西安石油学院学报(自然科学版),2003,18(4):7-10.WU Shaobo,ZHAO Jingzhou,LUO Jihong,et al.Diagenesis of Chang2reservoir of Upper Triassic Series in Zichang oilfield and the factors of influencing the physical property of the reservoir[J].Journal of Xi’an Petroleum Institute(Natural Science Edition),2003,18(4):7-10.(in Chinese)
[6]柳波,迟亚奥,黄志龙,等.三塘湖盆地马朗凹陷二叠系油气运移机制与页岩油富集规律[J].石油与天然气地质,2013,34(6):725-730.LIU Bo,CHI Yaao,HUANG Zhilong,et al.Migration mechanism of the Permian hydrocarbon and shale oil accumulation in Malang sag,the Sangtanghu basin[J].Oil&Gas Geology,2013,34(6):725-730.(in Chinese)
[7]GOUT R,OELKERS E H,SCHOTT J,et al.The suiface chemistry and structure of acid-leached albite:new insights on the dissolution mechanism of the alkali feldspars[J].Geochim.et Cosmochim.Acta,1997,61(7):3013-3018.
[8]吴林钢,李秀生,郭小波,等.马朗凹陷芦草沟组页岩油储层成岩演化与溶蚀孔隙形成机制[J].中国石油大学学报(自然科学版),2012,36(3):38-43,53.WU Lingang,LI Xiusheng,GUO Xiaobo,et al.Diagenetic evolution and formation mechanism of dissolved pore of shale oil reservoirs of Lucaogou formation in Malang sag[J].Journal of China University of Petroleum,2012,36(3):38-43,53.(in Chinese)
[9]远光辉,操应长,葸克来,等.东营凹陷北带古近系碎屑岩储层长石溶蚀作用及其物性响应[J].石油学报,2013,34(5):853-866.YUAN Guanghui,CAO Yingchang,XI Kelai,et al.Feldspar dissolution and its impact on physical properties of Paleogene clastic reservoirs in the northern slope zone of the Dongying sag[J].Acta Petrolei Sinica,2013,34(5):853-866.(in Chinese)
[10]季汉成,徐珍.深部碎屑岩储层溶蚀作用实验模拟研究[J].地质学报,2007,81(2):212-219.JI Hancheng,XU Zhen.Experimental study on dissolution of deep clastic reservoir[J].Acta Geologica Sinica,2007,81(2):212-219.(in Chinese)
[11]BLAKE R E,WALTER L M.Effects of organic acids on the dissolution of orthoclase at 80℃and pH 6[J].Chemical Geology,1996,132(10):91-102.
[12]黄福堂,邹信方,张作祥.地层水中主要酸类对储层物性影响因素研究[J].大庆石油地质与开发,1998,17(3):7-9.HUANG Futang,ZOU Xinfang,ZHANG Zuoxiang.Study on the factors affecting the physical properties of main acids in formation water[J].Petroleum Geology&Oilfield Development in Daqing,1998,17(3):7-9.(in Chinese)
[13]李建华,宋兵,耿辉,等.大民屯凹陷构造油气藏有利分布区定量预测[J].断块油气田,2012,19(2):137-141.LI Jianhua,SONG Bing,GENG Hui,et al.Quantitative prediction of favorable distribution area of structural pools in Damintun depression[J].Fault-Block Oil&Gas Field,2012,19(2):137-141.(in Chinese)
[14]马满兴.大民屯凹陷油页岩层段储集性能研究[J].岩性油气藏,2013,25(5):37-43.MA Manxing.Study on the reservoir properties of the interval of oil shale in Damintun depression[J].Lithologic Reservoirs,2013,25(5):37-43.(in Chinese)
[15]赵明,季峻峰,陈振岩,等.大民屯凹陷古近系高岭石亚族和伊/蒙混层矿物特征与盆地古温度[J].中国科学:地球科学,2011,41(2):169-180.ZHAO Ming,JI Junfeng,CHEN Zhenyan,et al.Mineral characteristics of the kaolinite subfamily and I/Mmixed layer in the Paleogene of the Damintun depression and the ancient temperature of the basin[J].Science China Earth Sciences,2011,41(2):169-180.(in Chinese)
[16]叶加仁,郝芳,陈建渝.辽河盆地大民屯凹陷流体动力场特征[J].石油与天然气地质,2001,22(2):128-132.YE Jiaren,HAO Fang,CHEN Jianyu.Characteristics of hydrodynamic field in Damintun depression,Liaohe basin[J].Oil&Gas Geology,2001,22(2):128-132.(in Chinese)
[17]蔡进功,谢忠怀,田芳,等.济阳坳陷深层砂岩成岩作用及孔隙演化[J].石油与天然气地质,2002,23(1):84-88.CAI Jingong,XIE Zhonghuai,TIAN Fang,et al.Diagenesis and pore evolution of deep sandstone in Jiyang depression[J].Oil&Gas Geology,2002,23(1):84-88.(in Chinese)
[18]李汶国,张晓鹏,钟玉梅.长石砂岩次生溶孔的形成机理[J].石油与天然气地质,2005,26(2):220-223.LI Wenguo,ZHANG Xiaopeng,ZHONG Yumei.Formation mechanism of secondary dissolved pores in arcose[J].Oil&Gas Geology,2005,26(2):220-223.(in Chinese)
[19]康逊,胡文瑄,曹剑,等.钾长石和钠长石差异溶蚀与含烃类流体的关系-以准噶尔盆地艾湖油田百口泉组为例[J].石油学报,2016,37(11):1381-1393.KANG Xun,HU Wenxuan,CAO Jian,et al.Relationship between hydrocarbon bearing fluid and the differential corrosion of potash feldspar and albite:a case study of Baikouquan formation in Aihu oilfield,Junggar basin[J].Acta Petrolei Sinica,2016,37(11):1381-1393.(in Chinese)
[20]于川淇,宋晓蛟,李景景,等.长石溶蚀作用对储层物性的影响---以渤海湾盆地东营凹陷为例[J].石油与天然气地质,2013,34(6):765-770.YU Chuanqi,SONG Xiaojiao,LI Jingjing,et al.Impact of feldspar dissolution on reservoir physical properties:a case from Dongying sag,the Bohai Bay basin[J].Oil&Gas Geology,2013,34(6):765-770.(in Chinese)
[21]黄思静,杨俊杰,张文正,等.不同温度条件下乙酸对长石溶蚀过程的实验研究[J].沉积学报,1995,13(1):7-17.HUANG Sijing,YANG Junjie,ZHANG Wenzheng,et al.Experimental study on dissolution of feldspar by acetic acid at different burial temperature[J].Acta Sedimentologica Sinica,1995,13(1):7-17.(in Chinese)