潜江凹陷潜江组盐间页岩油储层发育特征及影响因素
|
摘要
以江汉盆地潜江凹陷潜江组潜3~4油组盐间页岩油储层为研究对象,通过岩心观察、岩石薄片鉴定、氩离子抛光-扫描电镜、低温氮气吸附及高压压汞等技术手段对泥页岩的岩相特征、储集空间类型、储层物性特征及影响因素进行研究。结果表明:潜江组潜3~4油组盐间页岩油储层矿物组成复杂,主要发育层状云(泥)质钙芒硝岩相、纹层状泥质云岩相、纹层状云质泥岩相、纹层状泥质灰岩相、纹层状灰质泥岩相和块状云岩相等6种岩相类型;储集空间包括层间缝、晶间孔、晶间溶孔及黏土矿物晶间孔;储层孔隙度平均为11.4%～18.9%,渗透率平均为2.635～4.827mD,属于中孔、特低渗透储层;纹层状泥质云岩相和块状云岩相的物性和含油性好,为最有利的岩相;压实作用及后期硫酸盐矿物的充填作用是造成储层物性变差的主要原因。
The samples of shale oil reservoirs from the Qian3~4 formation of Qianjiang Sag in Jianghan Basin were collected for a series of experimental studies including core description,thin section analysis,Argon Ionization-Field Emission Scanning Electron Microscopy(AIP-FESEM)analysis,low-temperature nitrogen adsorption,high-pressure mercury injection,etc. to analyze the characteristics of lithologic facies,reservoir storage space types,reservoir physical properties and their influencing factors. The results indicate that the inter-salt shale oil reservoirs in Qian3~4 are characterized by complex mineral composition. There are six types of lithofacies in the study area,which includes layered dolomite(argillaceous)calcium mangerite lithofacies,laminated argillaceous dolomite lithofacies,laminated dolomite mudstone lithofacies,laminated argillaceous limestone lithofacies,laminated lime mudstone lithofacies and massive dolomite lithofacies. The main reservoir storage space of inter-salt shale oil are interlayer fractures,intercrystalline pores,intercrystalline dissolved pores and clay intracrystalline pores. The average porosity is 11.4%-18.9% and the average permeability is 2.635-4.827 mD. The formation belongs to mid-porosity and extra-low permeable formation. Laminated argillaceous dolomite lithofacies and massive dolomite lithofacies are the most favorable facies types with good physical properties and high oil-bearing characteristics. Compaction and authigenic sulfate minerals filling are the main reasons for the poor physical properties of the reservoir.
The samples of shale oil reservoirs from the Qian3~4 formation of Qianjiang Sag in Jianghan Basin were collected for a series of experimental studies including core description,thin section analysis,Argon Ionization-Field Emission Scanning Electron Microscopy(AIP-FESEM)analysis,low-temperature nitrogen adsorption,high-pressure mercury injection,etc. to analyze the characteristics of lithologic facies,reservoir storage space types,reservoir physical properties and their influencing factors. The results indicate that the inter-salt shale oil reservoirs in Qian3~4 are characterized by complex mineral composition. There are six types of lithofacies in the study area,which includes layered dolomite(argillaceous)calcium mangerite lithofacies,laminated argillaceous dolomite lithofacies,laminated dolomite mudstone lithofacies,laminated argillaceous limestone lithofacies,laminated lime mudstone lithofacies and massive dolomite lithofacies. The main reservoir storage space of inter-salt shale oil are interlayer fractures,intercrystalline pores,intercrystalline dissolved pores and clay intracrystalline pores. The average porosity is 11.4%-18.9% and the average permeability is 2.635-4.827 mD. The formation belongs to mid-porosity and extra-low permeable formation. Laminated argillaceous dolomite lithofacies and massive dolomite lithofacies are the most favorable facies types with good physical properties and high oil-bearing characteristics. Compaction and authigenic sulfate minerals filling are the main reasons for the poor physical properties of the reservoir.
引文
[1]邹才能,朱如凯,白斌,等.致密油与页岩油内涵、特征、潜力及挑战[J].矿物岩石地球化学通报,2015,34(1):3-17.ZOU Caineng,ZHU Rukai,BAI Bin,et al.Significance,geologic characteristics,resource potential and future challenges of tight oil and shale oil[J].Bulletin of Mineralogy,Petrology and Geochemistry,2015,34(1):3-17.
[2]邹才能,杨智,崔景伟,等.页岩油形成机制、地质特征及发展对策[J].石油勘探与开发,2013,40(1):14-26.ZOU Caineng,YANG Zhi,CUI Jingwei,et al.Formation mechanism,geological characteristics and development strategy of nonmarine shale oil in China[J].Petroleum Exploration and Development,2013,40(1):14-26.
[3]SONNENBERG S A,PRAMUDITO A.Petroleum geology of the giant Elm Coulee field,Williston Basin[J].AAPG Bulletin,2009,93(9):1 127-1 153.
[4]GIBSON R I.Basement tectonics and hydrocarbon production in the Williston Basin:An interpretive overview[R].Tulsa:7th International Williston Basin Symposium,1995:3-11.
[5]LA F R,HOLCOMB W D,ARAGON J.Impact of completion system,staging,and hydraulic fracturing tends in the Bakken Formation of the eastern Williston Basin[R].SPE 152530,2012.
[6]RASDI F,CHU L F.Diagnosing fracture network pattern and flow regimes aids production performance analysis in unconventional oil reservoirs[R].SPE 151623,2012.
[7]CENTURION S,CADE R,LUO X L.Eagle Ford shale:Hydraulic fracturing,completion,and production trends:Part II[R].SPE158501,2012.
[8]ORANGI A,NAGARAJAN N,HONARPOUR M,et al.Unconventional shale oil and gas-condensate reservoir production,impact of rock,fluid,and hydraulic fractures[R].SPE 140536,2011.
[9]孙焕泉.济阳坳陷页岩油勘探实践与认识[J].中国石油勘探,2017,22(4):1-14.SUN Huanquan.Exploration practice and cognitions of shale oil in Jiyang depression[J].China Petroleum Exploration,2017,22(4):1-14.
[10]王芙蓉,何生,郑有恒,等.江汉盆地潜江凹陷潜江组盐间页岩油储层矿物组成与脆性特征研究[J].石油实验地质,2016,38(2):211-218.WANG Furong,HE Sheng,ZHENG Youheng,et al.Mineral composition and brittleness characteristics of the inter-salt shale oil reservoirs in the Qianjiang Formation,Qianjiang Sag[J].Petroleum Geology&Experiment,2016,38(2):211-218.
[11]张顺,陈世悦,鄢继华,等.东营凹陷西部沙三下亚段-沙四上亚段泥页岩岩相及储层特征[J].天然气地球科学,2015,26(2):320-332.ZHANG Shun,CHEN Shiyue,YAN Jihua,et al.Characteristics of shale lithofacies and reservoir space in the 3rd and 4th members of Shahejie Formation,the west of Dongying sag[J].Natural Gas Geoscience,2015,26(2):320-332.
[12]王勇,王学军,宋国奇,等.渤海湾盆地济阳坳陷泥页岩岩相与页岩油富集关系[J].石油勘探与开发,2016,43(5):696-704.WANG Yong,WANG Xuejun,SONG Guoqi,et al.Genetic connection between mud shale lithofacies and shale oil enrichment in Jiyang Depression,Bohai Bay Basin[J].Petroleum Exploration and Development,2016,43(5):696-704.
[13]朱德燕,王勇,银燕,等.断陷湖盆咸化环境沉积与页岩油气关系--以东营凹陷、渤南地区为例[J].油气地质与采收率,2015,22(6):7-13.ZHU Deyan,WANG Yong,YIN Yan,et al.Study on the relationship between saline environmental deposition and shale oil-gas in faulted basin:A case study of areas of Dongying sag and Bonan subsag[J].Petroleum Geology and Recovery Efficiency,2015,22(6):7-13.
[14]王勇,宋国奇,刘惠民,等.济阳坳陷页岩油富集主控因素[J].油气地质与采收率,2015,22(4):20-25.WANG Yong,SONG Guoqi,LIU Huimin,et al.Main control factors of enrichment characteristics of shale oil in Jiyang depression[J].Petroleum Geology and Recovery Efficiency,2015,22(4):20-25.
[15]刘旭锋,张交东,周新桂,等.汶东凹陷页岩油发育特征及富集控制因素分析[J].油气地质与采收率,2016,23(6):41-46.LIU Xufeng,ZHANG Jiaodong,ZHOU Xingui,et al.Discussion of development features of shale oil in Wendong sag and its enrichment controlling factors[J].Petroleum Geology and Recovery Efficiency,2016,23(6):41-46.
[16]高凤琳,宋岩,姜振学,等.黏土矿物对页岩储集空间及吸附能力的影响[J].特种油气藏,2017,24(3):1-8.GAO Fenglin,SONG Yan,JIANG Zhenxue,et al.Influence of clay minerals on shale storage space and adsorptive capacity[J].Special Oil&Gas Reserviors,2017,24(3):1-8.
[2]邹才能,杨智,崔景伟,等.页岩油形成机制、地质特征及发展对策[J].石油勘探与开发,2013,40(1):14-26.ZOU Caineng,YANG Zhi,CUI Jingwei,et al.Formation mechanism,geological characteristics and development strategy of nonmarine shale oil in China[J].Petroleum Exploration and Development,2013,40(1):14-26.
[3]SONNENBERG S A,PRAMUDITO A.Petroleum geology of the giant Elm Coulee field,Williston Basin[J].AAPG Bulletin,2009,93(9):1 127-1 153.
[4]GIBSON R I.Basement tectonics and hydrocarbon production in the Williston Basin:An interpretive overview[R].Tulsa:7th International Williston Basin Symposium,1995:3-11.
[5]LA F R,HOLCOMB W D,ARAGON J.Impact of completion system,staging,and hydraulic fracturing tends in the Bakken Formation of the eastern Williston Basin[R].SPE 152530,2012.
[6]RASDI F,CHU L F.Diagnosing fracture network pattern and flow regimes aids production performance analysis in unconventional oil reservoirs[R].SPE 151623,2012.
[7]CENTURION S,CADE R,LUO X L.Eagle Ford shale:Hydraulic fracturing,completion,and production trends:Part II[R].SPE158501,2012.
[8]ORANGI A,NAGARAJAN N,HONARPOUR M,et al.Unconventional shale oil and gas-condensate reservoir production,impact of rock,fluid,and hydraulic fractures[R].SPE 140536,2011.
[9]孙焕泉.济阳坳陷页岩油勘探实践与认识[J].中国石油勘探,2017,22(4):1-14.SUN Huanquan.Exploration practice and cognitions of shale oil in Jiyang depression[J].China Petroleum Exploration,2017,22(4):1-14.
[10]王芙蓉,何生,郑有恒,等.江汉盆地潜江凹陷潜江组盐间页岩油储层矿物组成与脆性特征研究[J].石油实验地质,2016,38(2):211-218.WANG Furong,HE Sheng,ZHENG Youheng,et al.Mineral composition and brittleness characteristics of the inter-salt shale oil reservoirs in the Qianjiang Formation,Qianjiang Sag[J].Petroleum Geology&Experiment,2016,38(2):211-218.
[11]张顺,陈世悦,鄢继华,等.东营凹陷西部沙三下亚段-沙四上亚段泥页岩岩相及储层特征[J].天然气地球科学,2015,26(2):320-332.ZHANG Shun,CHEN Shiyue,YAN Jihua,et al.Characteristics of shale lithofacies and reservoir space in the 3rd and 4th members of Shahejie Formation,the west of Dongying sag[J].Natural Gas Geoscience,2015,26(2):320-332.
[12]王勇,王学军,宋国奇,等.渤海湾盆地济阳坳陷泥页岩岩相与页岩油富集关系[J].石油勘探与开发,2016,43(5):696-704.WANG Yong,WANG Xuejun,SONG Guoqi,et al.Genetic connection between mud shale lithofacies and shale oil enrichment in Jiyang Depression,Bohai Bay Basin[J].Petroleum Exploration and Development,2016,43(5):696-704.
[13]朱德燕,王勇,银燕,等.断陷湖盆咸化环境沉积与页岩油气关系--以东营凹陷、渤南地区为例[J].油气地质与采收率,2015,22(6):7-13.ZHU Deyan,WANG Yong,YIN Yan,et al.Study on the relationship between saline environmental deposition and shale oil-gas in faulted basin:A case study of areas of Dongying sag and Bonan subsag[J].Petroleum Geology and Recovery Efficiency,2015,22(6):7-13.
[14]王勇,宋国奇,刘惠民,等.济阳坳陷页岩油富集主控因素[J].油气地质与采收率,2015,22(4):20-25.WANG Yong,SONG Guoqi,LIU Huimin,et al.Main control factors of enrichment characteristics of shale oil in Jiyang depression[J].Petroleum Geology and Recovery Efficiency,2015,22(4):20-25.
[15]刘旭锋,张交东,周新桂,等.汶东凹陷页岩油发育特征及富集控制因素分析[J].油气地质与采收率,2016,23(6):41-46.LIU Xufeng,ZHANG Jiaodong,ZHOU Xingui,et al.Discussion of development features of shale oil in Wendong sag and its enrichment controlling factors[J].Petroleum Geology and Recovery Efficiency,2016,23(6):41-46.
[16]高凤琳,宋岩,姜振学,等.黏土矿物对页岩储集空间及吸附能力的影响[J].特种油气藏,2017,24(3):1-8.GAO Fenglin,SONG Yan,JIANG Zhenxue,et al.Influence of clay minerals on shale storage space and adsorptive capacity[J].Special Oil&Gas Reserviors,2017,24(3):1-8.