天然气地球科学

• 天然气地质学 • 上一篇    下一篇

鄂尔多斯盆地古峰庄—麻黄山地区长82低渗透砂岩致密化过程分析

屈雪峰,周晓峰,刘丽丽,丁黎   

  1. 1.中国石油长庆油田分公司勘探开发研究院,陕西 西安 710018;
    2.低渗透油气田勘探开发国家工程实验室,陕西 西安 710018;
    3.中国石油大学(北京)石油工程学院,北京 10229;
    4.中国石油大学(北京)石油工程教育部重点实验室,北京 10229;
    5.油气资源与工程国家重点实验室,北京 10229
  • 收稿日期:2017-06-30 修回日期:2018-01-15 出版日期:2018-03-10 发布日期:2018-03-10
  • 通讯作者: 周晓峰(1973-),男,甘肃甘谷人,讲师,博士,主要从事油气田地质学研究和教学工作. E-mail:zhouxf@cup.edu.cn
  • 作者简介:屈雪峰(1972-),女,山西运城人,教授级高级工程师,硕士,主要从事石油地质与石油开发研究.E-mail:qxf_cq@petrochina.com.cn.
  • 基金资助:

    国家科技重大专项“低渗—超低渗油藏有效开发关键技术(编号:2017ZX5013-00)”;国家科技重大专项“特低渗油藏有效开发技术”(编号:2011ZX05013-006);中国石油天然气集团公司专项“长庆油田5000万吨持续高效稳产关键技术研究及应用(编号:2016E-0505)”联合资助.
     

Densification process of Chang 82 ultra-low permeabilitysandstone,Gufengzhuang-Mahuangshan area,Ordos Basin

Qu Xue-feng,Zhou Xiao-feng,Liu Li-li,Ding Li   

  1. 1.Research Institute of Exploration and Development,Changqing Oilfield Company,PetroChina,Xi’an 710018,China;
    2.Exploration and Development National Project Laboratory ofLow Permeability Oil and Gas Fields,Xi’an 710018,China;
    3.Collegue of Petroleum Engineering,China University of Petroleum,Beijing 10229,China;
    4.MOE Key Laboratory of Petroleum Engineering,China University of Petroleum,Beijing 10229,China;
    5.State Key Laboratory of Petroleum Resources and Engineering,Beijing 10229,China
  • Received:2017-06-30 Revised:2018-01-15 Online:2018-03-10 Published:2018-03-10

摘要:

通过物性、铸体薄片和带有能谱仪的扫描电镜,对鄂尔多斯盆地古峰庄—麻黄山地区延长组长82低渗透砂岩的致密化过程进行定量研究。结果表明,砂岩致密化过程中发生的主要成岩作用事件有个,按成岩序列依次为早成岩阶段A期的方解石胶结和压实作用、早成岩阶段B期的绿泥石膜胶结以及中成岩阶段A期的长石溶蚀;经定量计算,砂岩的原始沉积物孔隙度为39.7%,渗透率为50 500×10-3μm2;早成岩阶段A期的方解石胶结和压实作用导致孔隙度和渗透率分别锐减为12.1%和1.07×10-3μm2,砂岩成为特低渗储层;早成岩阶段B期的绿泥石膜胶结引起孔隙度和渗透率进一步降低至10.8%和0.6×10-3μm2,特低渗透砂岩变差为超低渗透砂岩;中成岩阶段A期的油气成藏过程中,长石发生溶蚀作用而产生次生孔隙,促使孔隙度和渗透率分别提高到12.%和1.20×10-3μm2,超低渗透砂岩转化为特低渗透砂岩;古峰庄—麻黄山地区长82低渗透砂岩的致密化过程为“先致密后成藏,边成藏边扩容增渗”。

关键词: 先致密后成藏, 边成藏边扩容增渗, 低渗透砂岩, 长82, 古峰庄&mdash, 麻黄山地区, 鄂尔多斯盆地

Abstract:

By core physical property,casting slice,scanning electron microscope analysis with energy disperse spectroscopy,the densification process of Chang82 ultra-low permeability sandstone,Gufengzhuang-Mahuangshan area was studied.The study showed that there were four diagenetic events during densification process of the sandstone,which were calcite cement and compaction of early diagenesis stage A,chlorite film cement of early diagenesis stage B,and feldspar dissolution of middle diagenesis stage A on the basis of diagenetic sequence.By quantitative calculation,the initial porosity and permeability of sandstone in the area were 39.7% and 50 500×10-3μm2respectively.In the course of early diagenesis stage A,both calcite cement and mechanical compaction caused the sandstone to very low permeability reservoir whose porosity and permeability were 12.1% and 1.07×10-3μm2 separately.Then chlorite film in early diagenesis stage B converted very low permeability reservoir into ultra-low permeability reservoir whose porosity and permeability were 10.8% and 0.6×10-3μm2 apart.During hydrocarbon accumulation in middle diagenesis stage A,feldspar dissolution formed secondary pore,authigenic quartz and kaolinite cement whose comprehensive effect made porosity and permeability up to 12.% and 1.20×10-3μm2individually.So the densification process of Chang82 ultra-low permeability sandstone,Gufengzhuang-Mahuangshan area is first densification then accumulation and accumulation with increasing porosity and permeability.

Key words: First densification then accumulation, Accumulation with increased porosity and permeability, Ultra-low permeability sandstone, Chang82, Gufengzhuang-Mahuangshan area, Ordos Basin

中图分类号: 

  • TE122

[1]Hu Wenrui.The present and future of low permeability oil and gas in China[J].Engineering Sciences,2009,11(8):29-37.
胡文瑞.中国低渗透油气的现状与未来[J].中国工程科学,2009,11(8):29-37.[ZK)]
[2]Li Daopin,Luo Diqiang,Liu Yufen,et al.The Development of the Low Permeability Sandstone Oilfield[M].Beijing:Petroleum Industry Press,1997:1-9.
李道品,罗迪强,刘雨芬,等.低渗透砂岩油田开发[M].北京:石油工业出版社,1997:1-9.
[3]Zhang Zhiqiang,Zheng Junwei.Advance in exploration and exploitation technologies of low-permeability oil and gas[J].Advances in Earth Science,2009,2(8):85-86.
张志强,郑军卫.低渗透油气资源勘探开发技术进展[J].地球科学进展,2009,2(8):85-86.
[]Shi Cheng’en,Wan Xiaolong,Zhao Jiyong,et al.Development characteristics of super-low permeability oil layers in Ordos Basin,China[J].Journal of Chengdu University of Technology:Science & Technology Edition,2007,3(5):538-51.
[JP3]史成恩,万晓龙,赵继勇,等.鄂尔多斯盆地超低渗透油层开发特征[J].成都理工大学学报:自然科学版,2007,3(5):538-51.
[5]Li Shuheng,Zhao Jiyong,Cui Panfeng,et al.Strategies of development technology for ultra-low permeability reservoir[J].Lithologic Reservoirs,2008,20(3):128-131.
李书恒,赵继勇,崔攀峰,等.超低渗透储层开发技术对策[J].岩性油气藏,2008,20(3):128-131.
[6]Qu Hongjun,Yang Xianchao,Cao Jinzhou,et al.Oil accumulation rules in deep zones of Upper Triassic Yanchang Formation in Ordos Basin[J].Acta Petrolei Sinica,2011,32(2):23-28.
屈红军,杨县超,曹金舟,等.鄂尔多斯盆地上三叠统延长组深层油气聚集规律[J].石油学报,2011,32(2):23-28.
[7]Yao Jingli,Deng Xiuqin,Zhao Yande,et al.Characteristics of tight oil in Triassic Yanchang Formation,Ordos Basin[J].Petroleum Exploration and Development,2013,0(2):150-158.
姚泾利,邓秀芹,赵彦德,等.鄂尔多斯盆地延长组致密油特征[J].石油勘探与开发,2013,0(2):150-158.
[8]Wang Xuejun,Wang Zhixin,Chen Jie,et al.Petroleum migration and accumulation of Yanchang Formation in the Zhenbei Oilfield,Ordos Basin[J].Petroleum Exploration and Development,2011,38(3):299-306.
王学军,王志欣,陈杰,等.鄂尔多斯盆地镇北油田延长组石油运聚机理[J].石油勘探与开发,2011,38(3):299-306.
[9]Luo Xiaorong,Zhang Liuping,Yang Hua,et al.Oil accumulation process in the low-permeability Chang-81 member of Longdong area,Ordos Basin[J].Oil and Gas Geology,2010,31(6):770-779.
罗晓容,张刘平,杨华,等.鄂尔多斯盆地陇东地区长81段低渗透油藏成藏过程[J].石油与天然气地质,2010,31(6):770-779.
[10]Zhou Xiaofeng,Niu Xiaobing,Wang Jianguo,et al.Porosity evolution during diagenesis of oil-bearing sandstone in Chang 8 of Longdong oil-producing region[J].Science and Technology Review,201,32(12):1-7.
周晓峰,牛小兵,王建国,等.陇东油区长8含油砂岩成岩过程中的孔隙度演化[J].科技导报,201,32(12):1-7.
[11]Luo Xiaorong,Wang Zhongnan,Lei Yuhong,et al.Heterogeneity characteristics and accumulation model of ultra-low permeability sandstone reservoirs:A case study of the lower part of Yanchang Formation in the western Ordos Basin,China[J].Acta Petrolei Sinica,2016,37(supplement 1):87-98.
罗晓容,王忠楠,雷裕红,等.特超低渗砂岩油藏储层非均质性特征与成藏模式——以鄂尔多斯盆地西部延长组下组合为例[J].石油学报,2016,37(增刊1):87-98.
[12]Chen Zhankun,Wu Yasheng,Luo Xiaorong,et al.Reconstruction of paleo-passage system of Chang 8 Formation in Longdong area,Ordos Basin[J].Acta Geologica Sinica,2006,80(5):718-723.
陈占坤,吴亚生,罗晓容,等.鄂尔多斯盆地陇东地区长8段古输导格架恢复[J].地质学报,2006,80(5):718-723.
[13]Wang Qi,Zhu Xizhun,Chen Guojun,et al.Characteristics of carbon and oxygen isotopic compositions of carbonate cements in Triassic Yanchang Formation sandstones in Ordos Basin[J].Natural Gas Industry,2007,27(10):28-32.
王琪,禚喜准,陈国俊,等.延长组砂岩中碳酸盐胶结物氧碳同位素组成特征[J].天然气工业,2007,27(10):28-32.
[1]Deng Xiuqin,Liu Xinshe,Li Shixiang.The relationship between tightening history and hydrocarbon accumulating history of the super-low permeability reservoirs in the Triassic Yanchang Formation in the Ordos Basin[J].Oil and Gas Geology,2009,30(2):156-161.
邓秀芹,刘新社,李士祥.鄂尔多斯盆地三叠系延长组超低渗透储层致密史与油藏成藏史[J].石油与天然气地质,2009,30(2):156-161.
[15]Liu Mingjie,Liu Zhen,Liu Jingjing,et al.Coupling relationship between sandstone reservoir densification and hydrocarbon accumulation:A case from the Yanchang Formation of the Xifeng and Ansai areas,Ordos Basin[J].Petroleum Exploration and Development,201,1(2):168-175.
刘明洁,刘震,刘静静,等.砂岩储集层致密与成藏耦合关系——以鄂尔多斯盆地西峰—安塞地区延长组为例[J].石油勘探与开发,201,1(2):168-175.
[16]Luo Jinglan,Morad S,Yan Shike,et al.Reconstruction of the diagenesis of the fluvial-lacustrine-deltaic sandstones and its influence on the reservoir quality evolution:Evidence from Jurassic and Triassic sandstones,Yanchang Oilfield,Ordos Basin[J].Sciences in China:Series D,2001,31(12):1006-1016.
罗静兰,Morad S,阎世可,等.河流—湖泊三角洲相砂岩成岩作用的重建及其对储层物性演化的影响——以延长油区侏罗系—上三叠统砂岩为例[J].中国科学:D辑,2001,31(12):1006-1016.
[17]Ying Fengxiang,He Dongbo,Long Yumei,et al.SY/T577-2003 Diagenetic Stage Division of Clastic Rock[S].Beijing:State Economic and Trade Commission,2003.
应凤祥,何东博,龙玉梅,等.SY/T577-2003碎屑岩成岩阶段划分[S].北京:国家经济贸易委员会,2003.
[18]Yang Junjie.Tectonic Evolution and Oil and Gas Distribution rules in Ordos Basin[M].Beijing:Petroleum Industry Press,2002:50-56.
杨俊杰.鄂尔多斯盆地构造演化与油气分布规律[M].北京:石油工业出版社,2002:50-56.
[19]Zhang Wenzheng,Yang Hua,Li Jianfeng,et al.Leading effect of high class source rock of Chang 7 in Ordos Basin on enrichment of low permeability oil-gas accumulation:Hydrocarbon generation and expulsion mechanism[J].Petroleum Exploration and Development,2006,33(3):289-293.
张文正,杨华,李剑锋,等.论鄂尔多斯盆地长7段优质油源岩在低渗透油气成藏富集中的主导作用—强生排烃特征及机理分析[J].石油勘探与开发,2006,33(3):289-293.
[20]Guo Yanru,Liu Junbang,Yang Hua,et al.Hydrocarbon accumulation mechanism of low permeable tight lithologic oil reservoir in the Yanchang Formation,Ordos Basin,China[J].Petroleum Exploration and Development,2012,39():17-25.
郭彦如,刘俊榜,杨华,等.鄂尔多斯盆地延长组低渗透致密岩性油藏成藏机理[J].石油勘探与开发,2012,39():17-25.
[21]Wang Feng,Tian Jingchun,Zhang Jinquan,et al.Source analysis and favorable reservoir distribution of Chang 6 Formation in Jiyuan-Hujianwan area[J].Natural Gas Geoscience,2006,17(6):783-788.
王峰,田景春,张锦泉,等.鄂尔多斯盆地姬塬—胡尖山地区长6油层组的物源和优质储层分布[J].天然气地球科学,2006,17(6):783-788.
[22]Wang Ruifei,Chen Mingqiang,Sun Wei.The research of micro-pore structure in super-low permeability sandstone reservoir of the Yanchang Formation in Ordos Basin[J].Geological Review,2008,5(2):270-277.
[JP3]王瑞飞,陈明强,孙卫.鄂尔多斯盆地延长组超低渗透砂岩储层微观孔隙结构特征研究[J].地质论评,2008,5(2):270-277.
[23]Luo Jinglan,Liu Xiaohong,Lin Tong,et al.Impact of diagenesis and hydrocarbon emplacement on sandstone reservoir quality of the Yanchang Formation (Upper Triassic) in the Ordos Basin[J].Acta Geologica Sinica,2006,80(5):66-671.
罗静兰,刘小洪,林潼,等.成岩作用与油气侵位对鄂尔多斯盆地延长组砂岩储层物性的影响[J].地质学报,2006,80(5):66-671.
[2]Ge Yunjin,Chen Yong,Zhou Yaoqi.Effects of hydrocarbon emplacement to diagenesis of carbonate in different conditions:Evidences from synthetic oil(hydrocarbon)-bearing inclusions[J].Journal of China University of petroleum:Edition of Natural Science,2009,33(1):18-22.
葛云锦,陈勇,周瑶琪.不同成岩条件下油气充注对碳酸盐岩成岩作用的影响[J].中国石油大学学报:自然科学版,2009,33(1):18-22.
[25]Li Ru,Ge Yunjin,Chen Yong,et al.Experimental evidence of influential factor of quartz growth in reservoir[J].Journal of China University of Petroleum:Edition of Natural Science,2010,3(2):13-18.
李茹,葛云锦,陈勇,等.储层石英生长影响因素的实验证据[J].中国石油大学学报:自然科学版,2010,3(2):13-18.
[26]Li Rongxi,Xi Shengli,Di Lingjun.Oil/gas reservoiring phases determined through petrographic analysis of hydrocarbon inclusions in reservoirs:Taking Longdong Oilfield,Ordos Basin,as an example[J].Oil and Gas Geology,2006,27(2):19-199,217.
李荣西,席胜利,邸领军.用储层油气包裹体岩相学确定油气成藏期次:以鄂尔多斯盆地陇东油田为例[J].石油与天然气地质,2006,27(2):19-199,217.
[27]Chen Honghan,Wu You,Xiao Qiugou,et al.Fluid inclusion evidence of paleo-oil reservoir in the Changdu Basin[J].Acta Geologic Sinica,2010,8(1):157-169.
陈红汉,吴悠,肖秋苟,等.昌都盆地古油藏的流体包裹体证据[J].地质学报,2010,8(1):157-169.
[28]He Zixin.The Evolution and Petroleum of Ordos Basin[M].Beijing:Petroleum Industry Press,2003:88-173.
何自新.鄂尔多斯盆地演化与油气[M].北京:石油工业出版社,2003:88-173.
[29]Ren Zhanli,Zhao Zhongyuan,Zhang Jun,et al.Research on paleo-temperature in the Ordos Basin[J].Acta Sedimentologica Sinica,199,12(1):56-65.
任战利,赵重远,张军,等.鄂尔多斯盆地古地温研究[J].沉积学报,199,12(1):56-65.
[30]Ren Zhanli.Research on the relations between geothermal history and oil-gas accumulation in the Ordos Basin[J].Acta Petrolei Sinica,1996,17(1):17-2.
任战利.鄂尔多斯盆地热演化史与油气关系的研究[J].石油学报,1996,17(1):17-2.
[31]Ren Zhanli,Zhang Sheng,Gao Shengli,et al.Research on region of maturation anomaly and formation time in Ordos Basin[J].Acta Geologica Sinica,2006,80(5):67-68.
任战利,张盛,高胜利,等.鄂尔多斯盆地热演化程度异常分布区及形成时期探讨[J].地质学报,2006,80(5):67-68.
[32]Liu Chao,Wang Zhenliang,Liu Chiyang,et al.Characteristics of fluid inclusions in Yanchang Formation of the Yanchang Oilfield,Ordos Basin[J].Acta Geoscientica Sinica,2009,30(2):215-220.
刘超,王震亮,刘池洋,等.鄂尔多斯盆地延长矿区延长组流体包裹体特征[J].地球学报,2009,30(2):215-220.
[33]Liang Yu,Ren Zhanli,Wang Yanlong,et al.Characteristics of fluid inclusions and reservoiring phases in the Yanchang Formation of Zichang area,the Ordos Basin[J].Oil and Gas Geology,2011,32(2):182-191.
梁宇,任战利,王彦龙,等.鄂尔多斯盆地子长地区延长组流体包裹体特征与油气成藏期次[J].石油与天然气地质,2011,32(2):182-191.
[3]Beard D C,Weyl P K.Influence of texture on porosity and permeability of unconsolidated sand[J].AAPG Bulletin,1973,57(2):39-369.
[35]Li Wenguo,Zhang Xiaopeng,Zhong Yumei.Formation mechanism of secondary dissolved pores in arcose[J].Oil and Gas Geology,2005,26(2):220-229.
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):220-229.
[36]Qiu Longwei,Jiang Zaixing,Chen Wenxue.A new type reservoir dissolved pore types-quartz secondary porosity[J].Acta Sedimentologica Sinica,2002,20():621-627.
邱隆伟,姜在兴,陈文学.一种新的储层孔隙成因类型—石英溶解型次生孔隙[J].沉积学报,2002,20():621-627.
[37]Huang Sijing,Xie Lianwen,Zhang Meng,et al.Formation mechanism of authigenic chlorite and its relation to preservation of porosity in nonmarine Triassic reservoir sandstones,Ordos Basin and Sichuan Basin,China[J].Journal of Chengdu University of Technology:Science and Technology Edition,200,31(3):273-281.
黄思静,谢连文,张萌,等.中国三叠系陆相砂岩中自生绿泥石的形成机制及其与储层孔隙保存的关系[J].成都理工大学学报:自然科学版,200,31(3):273-281.
[38]Zhang Jinliang,Si Xueqiang,Liang Jie,et al.Diagenesis of lacustrine deltaic sandstones and its impact on reservoir quality[J].Acta Sedimentologica Sinica,200,22(2):225-233.
张金亮,司学强,梁杰,等.陕甘宁盆地庆阳地区长8油层砂岩成岩作用及其对储层性质的影响[J].沉积学报[J],200,22(2):225-233.
[39]Li Hong,Wang Furong,Dai Shili,et al.Influence of chlorite film on reservoir porosity:A case study from the second member of Yanchang Formation in Ordos Basin[J].Lithologic Reservoirs,2008,20():71-7.
李弘,王芙蓉,戴世立,等.绿泥石膜对储层孔隙度的影响——以鄂尔多斯盆地M油田延长组2段为例[J].岩性油气藏,2008,20():71-7.
[0]Zhang Xia,Lin Chunming,Chen Zhaoyou.Characteristics of chlorite minerals from Upper Triassic Yanchang Formation in the Zhenjing area,Ordos Basin[J].Acta Geologica Sinica,2011,85(10):1659-1671.
[JP3]张霞,林春明,陈召佑.鄂尔多斯盆地镇泾区块上三叠统延长组砂岩中绿泥石矿物特征[J].地质学报,2011,85(10):1659-1671.
[1]Liu Yiqun,Li Wenhou.Diagenetic characteristics and porosity evolution of the oil-bearing arkoses in the Upper Triassic in the eastern Shan-Gan-Ning Basin[J].Acta Sedimentologica Sinica,1996,1(3):87-96.
柳益群,李文厚.陕甘宁盆地东部上三叠统含油长石砂岩的成岩特点及孔隙演化[J].沉积学报,1996,1(3):87-96.
[2]Tian Jianfeng,Liu Chiyang,Wang Guicheng,et al.Alkaline dissolution of sandstone in the Triassic Yanchang Formation in the Ordos Basin[J].Earth Science:Journal of China University of Geosciences,2011,36(1):103-110.
田建锋,刘池洋,王桂成,等.鄂尔多斯盆地三叠系延长组砂岩的碱性溶蚀作用[J].地球科学:中国地质大学学报,2011,36(1):103-110.
[3]Yao Jingli,Wang Qi,Zhang Rui,et al.Forming mechanism and their environmental implications of chlorite-coatings in Chang 6 sandstone (Upper Triassic) of Huaqing area,Ordos Basin[J].Acta Sedimentologica Sinica,2011,29(1):72-79.
姚泾利,王琪,张瑞,等.鄂尔多斯盆地华庆地区延长组长6砂岩绿泥石膜的形成机理及其环境指示意义[J].沉积学报,2011,29(2):72-79.
[]Zhou Xiaofeng,Wang Jianguo,Lan Chaoli,et al.Forming mechanisms of chlorite films in Yanchang Formation,Ordos Basin[J].Journal of China University of Petroleum:Edition of Natural Science,2016,0():20-28.
周晓峰,王建国,兰朝利,等.鄂尔多斯盆地延长组绿泥石膜的形成机制[J].中国石油大学学报:自然科学版,2016,0():20-28.
[5]Zhou Xiaofeng,Ding Li,Yang Weiguo,et al.Growth pattern of chlorite film in Chang 8 sandstone of Yanchang Formation in Ordos Basin[J].Lithologica Reservoirs,2017,29():1-10.
周晓峰,丁黎,杨卫国,等.鄂尔多斯盆地延长组长 8 油层组砂岩中绿泥石膜的生长模式[J].岩性油气藏,2017,29():1-10.
[6]Xiang Fang,Feng Qin,Zhang Deyan,et al.Further study of chlorite rim in sandstone:Evidences from Yanchang Formation in Zhenjing area,Ordos Basin,China[J].Journal of Chengdu University of Technology:Science and Technology Edition,2016,3(1):59-67.
向芳,冯钦,张得彦,等.绿泥石环边的再研究——来自镇泾地区延长组砂岩的证据[J].成都理工大学学报:自然科学版,2016,3(1):59-67.
[7]Zhou Xiaofeng,Li Shuheng,Song Peng,et al.Forming mechanism of chlorite film on calcite cement in Change 8 sandstone,southwest Ordos Basin[J].Journal of Xi’an Shiyou University:Natural Science Edition,2017,32(3):3-3.
周晓峰,李书恒,宋鹏,等.鄂尔多斯盆地西南部长8砂岩中方解石胶结物表面绿泥石膜的形成机制[J].西安石油大学学报:自然科学版,2017,32(3):3-3.

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