鄂尔多斯盆地延安地区马五段上组合细粒白云岩储层特征及有利储层控制因素
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摘要
针对鄂尔多斯盆地延安地区马五段上组合(马五_4至马五_1亚段)细粒致密白云岩储层天然气勘探取得新突破,展开对低孔低渗白云岩储层特征及孔隙的成因研究。通过岩心观察、薄片分析及阴极发光等测试,结合岩石物性分析,明确了细粒白云岩储层的储渗特征、有利储层的演化过程及控制因素。结合地球化学及地球物理数据分析认为,研究区马五段上组合储层岩性主要包括含膏模白云岩、细晶白云岩和岩溶角砾岩等,储集空间以膏模溶孔、晶间(溶)孔、非选择性角砾间溶蚀孔洞为主,局部裂缝发育,属低孔低渗孔隙型储集层;位于高古地势、经多期岩溶(准同生期、表生期和埋藏期岩溶)叠加改造的膏晶模云坪是研究区细粒白云岩有利储层的主要分布区。
A new natural gas exploration breakthrough has been gained in the fine-grained tight dolostone reservoirs of the Upper Assemblage of the Ma-5 Member in the Yan'an area of the Ordos Basin. This paper presents a detailed research on the characteristics of low-porosity and low-permeability dolostone reservoirs and the genesis of porosities. Through core observation, thin section analysis and cathodoluminescence testing, combined with rock physical property analysis, the porosity-permeability characteristics of the fine-grained dolostone reservoirs and the favorable reservoirs′evolution process and controlling factors are clarified. Results show that the lithology of fine-grained dolostone reservoirs is mainly composed of gypsum pseudocrystal dolomite, fine-grained dolomite and karst breccia dolomite. The porosity types contain gypsum pseudocrystal dissolved pores, intercrystalline dissolved pores and non-selective breccia dissolved pores, with local fractures developing. Thus, it is a pore type reservoir with low porosity and permeability. The mould-pore-contained gypsodolomite flat, which is located at the high position and transformed by multi-stage karsts(penecontemporaneous, epigenetic and burial), is the main distribution area of favorable reservoirs of the fine-grained dolomite in the study area.
A new natural gas exploration breakthrough has been gained in the fine-grained tight dolostone reservoirs of the Upper Assemblage of the Ma-5 Member in the Yan'an area of the Ordos Basin. This paper presents a detailed research on the characteristics of low-porosity and low-permeability dolostone reservoirs and the genesis of porosities. Through core observation, thin section analysis and cathodoluminescence testing, combined with rock physical property analysis, the porosity-permeability characteristics of the fine-grained dolostone reservoirs and the favorable reservoirs′evolution process and controlling factors are clarified. Results show that the lithology of fine-grained dolostone reservoirs is mainly composed of gypsum pseudocrystal dolomite, fine-grained dolomite and karst breccia dolomite. The porosity types contain gypsum pseudocrystal dissolved pores, intercrystalline dissolved pores and non-selective breccia dissolved pores, with local fractures developing. Thus, it is a pore type reservoir with low porosity and permeability. The mould-pore-contained gypsodolomite flat, which is located at the high position and transformed by multi-stage karsts(penecontemporaneous, epigenetic and burial), is the main distribution area of favorable reservoirs of the fine-grained dolomite in the study area.
引文
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吴东旭,周进高,吴兴宁,等.2018.鄂尔多斯盆地西缘早中奥陶世岩相古地理研究[J].高校地质学报,24(5):747-760.
谢锦龙,吴兴宁,孙六一,等.2013.鄂尔多斯盆地奥陶系马家沟组五段岩相古地理及有利区带预测[J].海相油气地质,18(4):23-32.
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伊硕,黄文辉,王一刚,等.2018.延安以南地区奥陶系碳酸盐岩储层中流体包裹体及烃类物质的油气指示意义[J].油气地质与采收率.25(6):38-44.
于洲,孙六一,吴兴宁,等.2012.鄂尔多斯盆地靖西地区马家沟组中组合储层特征及主控因素[J].海相油气地质,17(4):49-56.
张杰,寿建峰,文应初,等.2012.去白云石化作用机理及其对储集层的改造[J].古地理学报,14(1):69-84.
赵卫卫,郭峰,王宝清,等.2011.苏里格地区下古生界储层流体包裹体特征及其成藏作用[J].兰州大学学报(自然科学版),47(1):6-11.
赵文智,沈安江,胡安平,等.2015.塔里木、四川和鄂尔多斯盆地海相碳酸盐岩规模储层发育地质背景初探[J].岩石学报,31(11):3495-3508.
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周进高,张帆,郭庆新,等.2011.鄂尔多斯盆地下奥陶统马家沟组障壁潟湖沉积相模式及有利储层分布规律[J].沉积学报,29(1):64-71.
Allan J R and Wiggins W D.1993.Dolomite reservoirs:Geochemical techniques for evaluating origin and distribution[J].Journal of Petroleum Science&Engineering,14(s 3-4):262-263.
Braun M and Friedman G M.1970.Dedolomitization fabric in peels:a possible clue to unconformity surfaces[J].Journal of Sedimentary Research,40(1):417-419.
Budai J M,Lohmann K C and Owen R M.1984.Burial dedolomite in the Mississippian Madison Limestone,Wyoming and Utah Thrust Belt(USA)[J].Journal of Sedimentary Petrology,54(1):276-288.
Feng Z Z,Zhang Y S and Jin Z K.1998.Type,origin,and reservoir characteristics of dolostones of the Ordovician Majiagou Group,Ordos,North China Platform[J].Sedimentary Geology,118(1-4):127-140.
Li J,Zhang W Z,Luo X,et al.2008.Paleokarst reservoirs and gas accumulation in the Jingbian field,Ordos Basin[J].Marine&Petroleum Geology,25(4):401-415.
Maliva R G,Budd D A,Clayton E A,et al.2011.Insights into the dolomitization process and porosity modification in sucrosic dolostones,Avon Park Formation(Middle Eocene),East-Central Florida,USA[J].Journal of Sedimentary Research,81(3):218-232.
Sun S Q.1995.Dolomite reservoirs:Porosity evolution and reservoir characteristics[J].AAPG Bulletin,79(2):186-204.
Von Morlot A.1847.Ueber Dolomit und Seine Künstliche Darstellung aus Kalkstein[M].Naturwissenschaftliche Abhandlungen von Wilhelm Haidinger,1:305-315.
Warren J K.1988.Sedimentology of Coorong dolomite in the Salt Creek region,South Australia[J].Carbonates Evaporites,3(2):175-199.
Yang Y T,Li W and Ma L.2005.Tectonic and stratigraphic controls of hydrocarbon systems in the Ordos basin:a multicycle cratonic basin in central China[J].AAPG Bulletin,89(2):255-269.
Zheng R C,Hu Z G,Feng Q P,et al.2007.Genesis of dolomite reservoir of the Changxing Formation of Upper Permian,Northeast Sichuan Basin[J].Journal of Mineralogy&Petrology,27(4):78-84.
丛宝华.2011.苏里格东部奥陶系马五段储层特征研究[D].成都:成都理工大学.
代金友,何顺利.2005.鄂尔多斯盆地中部气田奥陶系古地貌研究[J].石油学报,26(3):37-39.
代金友,晏宁平.2016.鄂尔多斯古岩溶气藏地质特征及成藏富集规律[M].北京:石油工业出版社.
单秀琴,胡国艺,高嘉玉.2003.鄂尔多斯盆地中部奥陶系方解石脉中包裹体流体势研究[J].岩石学报,19(2):355-358.
冯增昭,鲍志东.1999.鄂尔多斯奥陶纪马家沟期岩相古地理[J].沉积学报,17(1):1-8.
冯增昭,鲍志东,康祺发,等.1999.鄂尔多斯奥陶纪古构造[J].古地理学报,1(3):83-94.
何刚,卢涛,雷卞军,等.2011.靖边气田东侧马五1-2储层成岩作用及孔隙演化[J].西南石油大学学报(自然科学版),33(3):18-26.
何江,方少仙,侯方浩,等.2013.风化壳古岩溶垂向分带与储集层评价预测-以鄂尔多斯盆地中部气田区马家沟组马五5-马五1亚段为例[J].石油勘探与开发,40(5):534-542.
侯方浩,方少仙,董兆雄,等.2003.鄂尔多斯盆地中奥陶统马家沟组沉积环境与岩相发育特征[J].沉积学报,21(1):106-112.
胡昊,王振宇,张云峰.2013.塔中北斜坡鹰山组碳酸盐岩层间岩溶储集层特征[J].新疆石油地质,34(3):277-281.
黄道军,文彩霞,季海锟,等.2009.鄂尔多斯盆地东部奥陶系风化壳储层特征及主控因素分析[J].海相油气地质,14(03):10-18.
黄思静.2010.碳酸盐岩的成岩作用[M].北京:地质出版社.
蒋小琼,管宏林,郑和荣,等.2014.四川盆地普光气田飞仙关组白云岩储层成因探讨[J].石油实验地质,36(3):332-336.
雷卞军,卢涛,王东旭,等.2010.靖边气田马五(1-4)亚段沉积微相和成岩作用研究[J].沉积学报,28(6):1153-1164.
马振芳.1998.陕甘宁盆地中部奥陶系地层划分及风化壳小层对比.中国中部大气田研究与勘探[M].北京:石油工业出版社.
施继锡,李本超,傅家谟,等.1987.有机包裹体及其与油气的关系[J].中国科学(B辑),17(3):318-326.
苏中堂.2011.鄂尔多斯盆地古隆起周缘马家沟组白云岩成因及成岩系统研究[D].成都:成都理工大学.
王春连.2011.四川盆地东北部地区长兴组碳酸盐岩成岩作用及储层孔隙演化[J].地质与勘探,47(5):846-855.
王一刚,刘志坚,文应初.1996.川东石炭系储层有机包裹体、储层沥青与烃类运聚关系[J].沉积学报,14(4):77-83.
王作乾,何顺利.2009.靖边下古生界气藏马五段碳酸盐岩储层综合评价[J].石油天然气学报,31(04):180-182.
吴东旭,周进高,吴兴宁,等.2018.鄂尔多斯盆地西缘早中奥陶世岩相古地理研究[J].高校地质学报,24(5):747-760.
谢锦龙,吴兴宁,孙六一,等.2013.鄂尔多斯盆地奥陶系马家沟组五段岩相古地理及有利区带预测[J].海相油气地质,18(4):23-32.
杨华,付金华,魏新善,等.2011.鄂尔多斯盆地奥陶系海相碳酸盐岩天然气勘探领域[J].石油学报,32(5):733-740.
姚泾利,王兰萍,张庆,等.2011.鄂尔多斯盆地南部奥陶系古岩溶发育控制因素及展布[J].天然气地球科学,22(1):56-65.
伊硕,黄文辉,王一刚,等.2018.延安以南地区奥陶系碳酸盐岩储层中流体包裹体及烃类物质的油气指示意义[J].油气地质与采收率.25(6):38-44.
于洲,孙六一,吴兴宁,等.2012.鄂尔多斯盆地靖西地区马家沟组中组合储层特征及主控因素[J].海相油气地质,17(4):49-56.
张杰,寿建峰,文应初,等.2012.去白云石化作用机理及其对储集层的改造[J].古地理学报,14(1):69-84.
赵卫卫,郭峰,王宝清,等.2011.苏里格地区下古生界储层流体包裹体特征及其成藏作用[J].兰州大学学报(自然科学版),47(1):6-11.
赵文智,沈安江,胡安平,等.2015.塔里木、四川和鄂尔多斯盆地海相碳酸盐岩规模储层发育地质背景初探[J].岩石学报,31(11):3495-3508.
赵文智,沈安江,胡素云,等.2012.塔里木盆地寒武-奥陶系白云岩储层类型与分布特征[J].岩石学报,28(3):758-768.
周进高,张帆,郭庆新,等.2011.鄂尔多斯盆地下奥陶统马家沟组障壁潟湖沉积相模式及有利储层分布规律[J].沉积学报,29(1):64-71.
Allan J R and Wiggins W D.1993.Dolomite reservoirs:Geochemical techniques for evaluating origin and distribution[J].Journal of Petroleum Science&Engineering,14(s 3-4):262-263.
Braun M and Friedman G M.1970.Dedolomitization fabric in peels:a possible clue to unconformity surfaces[J].Journal of Sedimentary Research,40(1):417-419.
Budai J M,Lohmann K C and Owen R M.1984.Burial dedolomite in the Mississippian Madison Limestone,Wyoming and Utah Thrust Belt(USA)[J].Journal of Sedimentary Petrology,54(1):276-288.
Feng Z Z,Zhang Y S and Jin Z K.1998.Type,origin,and reservoir characteristics of dolostones of the Ordovician Majiagou Group,Ordos,North China Platform[J].Sedimentary Geology,118(1-4):127-140.
Li J,Zhang W Z,Luo X,et al.2008.Paleokarst reservoirs and gas accumulation in the Jingbian field,Ordos Basin[J].Marine&Petroleum Geology,25(4):401-415.
Maliva R G,Budd D A,Clayton E A,et al.2011.Insights into the dolomitization process and porosity modification in sucrosic dolostones,Avon Park Formation(Middle Eocene),East-Central Florida,USA[J].Journal of Sedimentary Research,81(3):218-232.
Sun S Q.1995.Dolomite reservoirs:Porosity evolution and reservoir characteristics[J].AAPG Bulletin,79(2):186-204.
Von Morlot A.1847.Ueber Dolomit und Seine Künstliche Darstellung aus Kalkstein[M].Naturwissenschaftliche Abhandlungen von Wilhelm Haidinger,1:305-315.
Warren J K.1988.Sedimentology of Coorong dolomite in the Salt Creek region,South Australia[J].Carbonates Evaporites,3(2):175-199.
Yang Y T,Li W and Ma L.2005.Tectonic and stratigraphic controls of hydrocarbon systems in the Ordos basin:a multicycle cratonic basin in central China[J].AAPG Bulletin,89(2):255-269.
Zheng R C,Hu Z G,Feng Q P,et al.2007.Genesis of dolomite reservoir of the Changxing Formation of Upper Permian,Northeast Sichuan Basin[J].Journal of Mineralogy&Petrology,27(4):78-84.
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