川东北元坝地区须家河组三段钙屑砂岩孔隙类型及地质意义

doi:10.11743/ogg20190517

摘要/Abstract

摘要： 钙屑砂岩在成因上属于陆源碎屑岩中的一类砂岩，其成分的特殊性决定了埋藏过程中成岩作用、储集空间以及油气产能上的特殊性。结合岩心、普通岩石薄片、铸体薄片、阴极发光、扫描电镜、X衍射数据、压汞数据和物性数据等资料，对川东北元坝西须家河组三段钙屑砂岩的孔隙类型、孔隙定量演化和孔隙有效性等方面进行了系统性分析。结果表明，钙屑砂岩原生孔隙很少，次生孔隙类型主要包括3类：晶间微孔隙、溶蚀型孔隙与裂缝型孔隙。各类孔隙的成因存在差异，晶间微孔主要与钙屑、钙质胶结物的重结晶作用有关，还有一些钙屑晶间微孔来源于母岩的白云岩化。裂缝的成因有两个，贴粒缝是由于钙屑与胶结物重结晶不同步，构造裂缝是由于须三段沉积时期强烈构造运动形成的；研究区钙屑砂岩溶孔发育有限，不能整体改善储层质量，仅形成局部“甜点”；晶间微孔普遍发育，是钙屑砂岩孔隙的主要贡献者，且大部分微孔都是有效孔隙，加上微裂缝的沟通，是天然气的主要储集空间。高钙屑高钙质胶结物含量的地区（如高能的分流河道），由于强烈重结晶提供大量晶间微孔，加上裂缝的沟通，成为须三段的优质储层区，可作为勘探开发的重点。

关键词: 孔隙类型, 孔隙定量演化, 孔隙有效性, 晶间微孔隙, 钙屑砂岩, 须家河组三段, 元坝地区, 四川盆地东北部

Abstract: Calcarenaceous sandstone is a type of sandstone in terrigenous clastic rocks in terms of genesis.The diagenesis in the burial process,reservoir space and hydrocarbon production capacity of calcarenaceous sandstones are determined to be quite special due to its uncommon compositions.Given the observation of the core,common thin sections,casting thin sections,cathode luminescent thin sections,scanning electron photomicrograph,as well as X-ray diffraction data,mercury intrusion data,and physical properties,we made a systematic study on the pore types,as well as quantitative evolution and validity of pores in the calcarenaceous sandstones of the 3rd member of Xujiahe Formation (T₃x₃) in western Yuanba area,Northeastern Sichuan Basin.The results show that there are fewer primary pores in these sandstones,and the secon-dary pores are mainly categorized into three types:intercrystalline micropores,dissolved pores and fractured pores.They are different in terms of genetic mechanism-the formation of intercrystalline micropores are mainly related to the recrystallization of calcareous debris and cements,and some intercrystalline micropores of calcareous debris are a result of the dolomitization of host rocks; while there are two causes for fractures:the intergranular fractures were developed out of unsynchronized recrystallization of calcareous debris and cements,and the structural fractures were formed due to the intense tectonic movements during the deposition of the T₃x₃.In addition,the dissolved pores were less developed and just formed partial "sweet spots",unable to improve the reservoir quality as a whole; while the well-developed intercrystalline pores,most of which are effective,serve as major contributors to the reservoir space of gases in calcarenaceous sandstones,combined with the communication provided by microfractures.Areas with high contents of calcareous debris and calcareous cements (such as high-energy distributary channels) are the high-quality reservoir zones in the T₃x₃,and could be the key areas for exploration and development,since strong recrystallization functions to produce a large number of intercrystalline micropores and the connection provided by fractures is also effective.

Key words: type of pores, quantitative evolution of pore, validity of pore, intercrystalline micropore, calcarenaceous sandstone, the 3rd member of Xujiahe Formation, Yuanba area, Northeastern Sichuan Basin

中图分类号:

TE122.2

唐自成,钟大康,王威,等. 川东北元坝地区须家河组三段钙屑砂岩孔隙类型及地质意义[J]. 石油与天然气地质, 2019, 40(5): 1115-1125. doi: 10.11743/ogg20190517 Tang Zicheng,Zhong Dakang,Wang Wei,et al. Pore types and geological significance of calcarenaceous sandstones in the 3rd member of Xujiahe Formation in Yuanba area,Northeastern Sichuan Basin[J]. Oil & Gas Geology, 2019, 40(5): 1115-1125. doi: 10.11743/ogg20190517

参考文献

[1] 张峰.川东北地区上三叠统须家河组层序岩相古地理研究[D].成都:成都理工大学,2011. Zhang Feng.Study on Sequence-Lithofacies paleogeography of the Xujiahe Formation of Upper Triassic in northeast of Sichuan Basin[D].Chengdu:Chengdu University of Technology,2011.
[2] 李宏涛,史云清,肖开华,等.元坝气田须三段气藏层序沉积与储层特征[J].天然气工业,2016,36(9):20-34. Li Hongtao,Shi Yunqing,Xiao Kaihua,et al.Sequence,sedimentary and reservoir characteristics of Xu 3 gas reservoir in the Yuanba Gasfield,NE Sichuan Basin[J].Natural Gas Industry,2016,36(9):20-34.
[3] 淡永.川东北须家河组物源分析与沉积体系研究[D].成都:成都理工大学,2011. Dan Yong.Analyses of the provenance and the depositional systems of Xujiahe Formation in northeast of Sichuan Basin[D].Chengdu:Chengdu University of Technology,2011.
[4] 沈均均,陈波,凡睿,等.川东北元坝地区上三叠统须家河组沉积特征研究[J].科学技术与工程,2014,14(19):46-53. Shen Junjun,Chen Bo,Fan Rui,et al.Sedimentary character of Upper Triassic series Xujiahe Formation in Yuanba area of northeastern Sichuan[J].Science Technology and Engineering,2014,14(19):46-53.
[5] 修昊.剑阁-元坝地区须三段致密砂岩储层特征研究[D].新疆:新疆大学,2015. Xiu Hao.Characteristics of T₃x₃ tight gas reservoir,Jiange-Yuanba area[D].Xinjiang:Xinjiang University,2015.
[6] 曾小英,张小青,钟玉梅.川西坳陷中段须家河组四段钙屑砂岩气层的成因[J].沉积学报,2007,25(6):896-902. Zeng Xiaoying,Zhang Xiaoqing,Zhong Yumei.Origin of calcarenaceous sandstone gas formation of the 4^th member of Xujiahe Formation in the middle part of western Sichuan depression[J].Acta Sedmentologica Sinica,2007,25(6):896-902.
[7] 林煜.川西丰谷构造须家河组四段钙屑砂岩优质储层控制因素[J].天然气地球科学,2012,23(4):691-699. Lin Yu.Controlling factors for T₃x₄ calcarenaceous sandstone in Fenggu structure,western Sichuan Basin[J].Natural Gas Geoscience,2012,23(4):691-699.
[8] 郑荣才,魏钦廉,高红灿,等.川西坳陷中段须四段钙屑砂岩储层特征及有利区块预测[J].成都理工大学学报(自然科学版),2007,34(5):489-496. Zheng Rongcai,Wei Qinlian,Gao Hongcan,et al.Prediction of the favorable blocks and the calcarenaceous sandstone reservoir characteristics of Upper Triassic in middle section of the west Sichuan depression[J].Journal of Chengdu University of Technology(Science &Technology Edition),2007,34(5):489-496.
[9] 盘昌林.四川盆地元坝地区上三叠统须家河组天然气成藏条件研究[D].成都:成都理工大学,2011. Pan Changlin.Reservoir formation condition of the Xujiahe Formation of the Upper Triassic in Yuanba area Sichuan Basin[D].Chengdu:Chengdu University of Technology,2011.
[10] 曾韬.川东北元坝地区须三段沉积相及沉积演化[J].成都理工大学学报(自然科学版),2014(4):468-475. Zeng Tao.Sedimentary facies and depositional evolution of Member 3 of Upper Triassic Xujiahe Formation in Yuanba area of northeast Sichuan,China[J].Journal of Chengdu University of Technology(Science &Technology Edition),2014(4):468-475.
[11] 黎静容,李毓,程洪亮,等.元坝地区须三段沉积特征[J].西安石油大学学报(自然科学版),2013,28(5):43-50. Li Jingrong,Li Yu,Cheng Hongliang,et al.Sedimentary characteristics of the third member of Xujiahe Formation in Yuanba area[J].Journal of Xi'an Shiyou University(Natural Science Edition),2013,28(5):43-50.
[12] 郝景宇.川东北地区须家河组沉积与层序特征精细研究[D].武汉:长江大学,2012. Hao Jingyu.Subtile sediment and sequence character in northeastern Sichuan Basin[D].Wuhan:Yangtze University,2012.
[13] 秦华,肖伟.川东北元坝地区须家河组凝缩层的归属及成因[J].天然气技术与经济,2010,04(3):11-13. Qin Hua,Xiao Wei.Timing and origin of condensed section of Xujiahe Formation in Yuanba area,northeastern Sichuan Basin[J].Natural Gas Technology,2010,04(3):11-13.
[14] 王杰,秦建中,刘文汇,等.川东北元坝地区中生代构造与动态热演化史——磷灰石、锆石(U-Th)/He定年分析[J].石油实验地质,2012,34(1):19-24. WangJie,Qin Jianzhong,Liu Wenhui,et al.Mesozoic tectonics and dynamic thermal history in Yuanba area of northeastern Sichuan Basin:application of(U-Th)/He dating of apatite and zircon[J].Petroleum Geology & Experiment,2012,34(1):19-24.
[15] 黄进腊,张哨楠,刘成川,等.川东北元坝地区须家河组断层预测及发育特征[J].天然气技术与经济,2013(3):3-6. Huang Jinla,Zhang Shaonan,Liu Chengchuan,et al.Fault prediction and development in Xujiahe Formation,Yuanba area,northeastern Sichuan Basin[J].Natural Gas Technology and Economy,2013(3):3-6.
[16] 张冲,谢润成,周文,等.川东北元坝地区须三段致密储集层裂缝特征[J].新疆石油地质,2014,35(4):395-398. Zhang Chong,Xie Runcheng,Zhouwen,et al.Fractures characteristics in tight reservoir of the 3^rd Member of Xujiahe Formation in Yuanba area in northeastern Sichuan Basin[J].Xinjiang Petroleum Geology,2014,35(4):395-398.
[17] 李昌峰.川东北元坝地区须三气藏致密储层特征及分布规律研究[D].成都:成都理工大学,2015. LiChangfeng.Research on the tight gas reservoir characteristics and distribution regularities of Member 3 of Xujiahe Formation in the northeastern Sichuan Basin[D].Chengdu:Chengdu University of Technology,2015.
[18] 何曼如,孙廷彬,王玲,等.川东北元坝地区须三段储集层形成机制[J].断块油气田,2016,23(1):6-10. He Manru,Sun Tingbin,Wang Lin,et al.Formation mechanism of 3^rd Member of Xujiahe Formation reservoir in Yuanba area of northeast Sichuan Basin[J].Fault-Block Oil & Gas Field,2016,23(1):6-10.
[19] 肖开华,李宏涛,贾爽.川东北元坝地区须三段钙屑砂岩储层特征及控气因素[J].石油与天然气地质,2014,35(5):654-660. Xiao Kaihua,Li Hongtao,Jia Shuang.Characteristics of calcarenaceous sandstone reservoirs and gas accumulation control factors of the 3^rd Member of Xujiahe Formation in Yuanba area,northeast Sichuan Basin[J].Oil & Gas Geology,2014,35(5):654-660.
[20] 杜红权,王威,周霞,等.川东北元坝地区须三段钙屑砂砾岩储层特征及控制因素[J].石油与天然气地质,2016,37(4):565-571. Du Hongquan,Wang Wei,Zhou Xia,et al.Reservoir characteristics and main controlling factors of calcareous coarse clastic rocks of the third Member of Xujiahe Formation in Yuanba area,northeastern Sichuan Basin[J].Oil & Gas Geology,2016,37(4):565-571.
[21] 王威.高能河道砂体特征及勘探意义——以元坝地区须三段为例[J].石油实验地质,2013,35(6):657-661. Wang Wei.Characteristics of highenergy channel sandstone and its exploration significance:A case from Xujiahe Formation in Yuanba area[J].Petroleum Geology & Experiment,2013,35(6):657-661.
[22] 胡宜奎.川东北元坝地区东部须家河组储层特征研究[D].成都:成都理工大学,2014. Hu Yikui.The research of reservoir characteristic of east Yuanba in northeast Sichuan Basin[D].Chengdu:Chengdu University of Technology,2014.
[23] 陈彦庆.川东北地区上三叠统须家河组储层特征研究[D].成都:成都理工大学,2011. Chen Yanqing.The research of reservoir charateristics of Upper Triassic Xujiahe Formation in the northeast area of Sichuan Basin[D].Chengdu:Chengdu University of Technology,2011.
[24] 李阔,曾韬,潘磊.川东北地区须家河组储层特征研究[J].岩性油气藏,2012,24(1):46-51. Li Kuo,Zeng Tao,Pan Lei.Reservoir characteristics of Xujiahe Formation in northeastern Sichuan Basin[J].Lithologic Reservoirs,2012,24(1):46-51.
[25] 袁桃.四川盆地元坝地区西部须家河组储层特征与控制因素[D].成都:成都理工大学,2014. Yuan Tao.The reservoir characteristics and main controlling factors of the Xujiahe Formation in the west of Yuanba area of Sichuan Basin[D].Chengdu:Chengdu University of Technology,2014.
[26] Rittenhouse G.Pore-space reduction by solution and cementation[J].Aapg Bulletin,1971(1):80-91.
[27] 刘春,张荣虎,张惠良,等.致密砂岩储层微孔隙成因类型及地质意义——以库车前陆冲断带超深层储层为例[J].石油学报,2017,38(2):150-159. Liu Chun,ZhangRonghu,Zhang Huiliang,et al.Genetic types and geological significance of micro pores in tight sandstone reservoirs:A case study of the ultra deep reservoir in the Kuqa foreland thrust belt,NW China[J].Acta Petrolei Sinica,2017,38(2):150-159.
[28] 应凤祥,杨式升,张敏,等.激光扫描共聚焦显微镜研究储层孔隙结构[J].沉积学报,2002,20(1):75-79. Ying Fengxiang,Yang Shisheng,Zhang Min,et al.Application of laser scanning confocal microscope to the measurement of pore texture in reservoirs[J].Acta Sedimentologica Sinica,2002,20(1):75-79.
[29] 邹才能,朱如凯,白斌,等.中国油气储层中纳米孔首次发现及其科学价值[J].岩石学报,2011,27(6):1857-1864. Zhou Caineng,Zhu Rukai,Bai Bin,et al.First discovery of nano-pore throat in oil and gas reservoir in China and its scientific value.Acta Petrologica Sinica,2011,27(6):1857-1864.
[30] Pittman E D.Microporosity in carbonate rocks[J].Aapg Bulletin,1971:98-105.
[31] 包洪平,杨帆,蔡郑红,等.鄂尔多斯盆地奥陶系白云岩成因及白云岩储层发育特征[J].天然气工业,2017,37(1):32-45. BaoHongping,Yang Fan,Cai Zhenghong,et al.Origin and reservoir characteristics of Ordovician dolostones in the Ordos Basin[J].Natural Gas Industry,2017,37(1):32-45.
[32] 郑剑锋,沈安江,陈永权,等.塔里木盆地下古生界白云岩储集空间特征及储层分类探讨[J].天然气地球科学,2015,26(7):1256-1267. Zheng Jianfeng,Shen Anjiang,Chen Yongquan,et al.Reservoir space and reservoir classification of Lower Paleozoic dolomite in the Tarim Basin[J].Natural Gas Geoscience,2015,26(7):1256-1267.
[33] 朱涛.剑阁-元坝地区须三段致密砂岩储层评价[D].成都:成都理工大学,2015. Zhu Tao.Comprehensive evaluation of the third segment of Xujiahe reservoirin Jiange-Yuanba area[D].Chengdu:Chengdu University of Technology,2015.
[34] Beard D C,Weyl P K.Influence of texture on porosity and permeability of unconsolidated sand[J].Aapg Bulletin,1973,57(2):349-369.
[35] Surdam R C,Boese S W,Crossey L J.The chemistry of secondary porosity[J].Aapg Bulletin,1984,37(2):183-200.
[36] 陈广,刘远汀,程博文.冲积扇储层中的砾缘缝——一种特殊储集空间的类型[J].四川地质学报,2017,37(2):179-181. ChenGuang,Liu Yuanting,Cheng Bowen.Grain boundary fracture in alluvial fan reservoir:A special reservoir space[J].Acta Geologica Sichuan,2017,37(2):179-181.
[37] 李跃纲,巩磊,曾联波,等.四川盆地九龙山构造致密砾岩储层裂缝特征及其贡献[J].天然气工业,2012,32(1):22-26. Li Yuegang,Gong Lei,Zeng Lianbo,et al.Characteristics of fractures and their contribution to the deliverability of tight conglomerate reservoirs in the Jiulongshan structure,Sichuan Basin[J].Natural Gas Industry,2012,32(1):22-26.
[38] 曾联波,李跃纲,王正国,等.川西南部须二段低渗透砂岩储层裂缝类型及其形成序列[J].地球科学,2007,32(2):194-200. Zeng Lianbo,Li Yuegang,Wang Zhengguo,et al.Type and sequence of fractures in the second member of Xujiahe Formation at the south of western Sichuan depression[J].Earth Science,2007,32(2):194-200.
[39] 王威,岳全玲.四川盆地北部须家河组致密砂岩储层成因机制[J].天然气勘探与开发,2012,35(1):13-17. Wang Wei,Yue Quanling.Genetic mechanisms for tight sandstone reservoir of Xujiahe Formation,northern Sichuan Basin[J].Natural Gas Exploration and Development,2012,35(1):13-17.
[40] 张莉,邹华耀,郝芳,等.川东北元坝地区须家河组储层特征与超致密成因探讨[J].地质学报,2017,91(9):2105-2118. Zhang Li,Zou Huayao,Hao Fang,et al.Characteristics and densification causes and of highly-tight sandstone of the Xujiahe Formation(T₃x²) in the Yuanba area,northeastern Sichuan Basin[J].Acta Geologica Sinica,2017,91(9):2105-2118.
[41] 钟大康,祝海华,孙海涛,等.鄂尔多斯盆地陇东地区延长组砂岩成岩作用及孔隙演化[J].地学前缘,2013,20(2):61-68. Zhong Dakang,Zhu Haihua,Sun Haitao,et al.Diagenesis and porosity evolution of sandstones in Longdong area,Ordos Basin[J].Earth Science Frontiers,2013,20(2):61-68.
[42] 胡浩,路遥,唐群英,等.川东北地区须家河组储层成岩作用对孔隙演化影响的定量研究[J].岩性油气藏,2014,26(4):103-109. Hu Hao,Lu Yao,Tang Qunying,et al.Quantitative research on the effect of diagenesis on porosity evolution of Xujiahe Formation in northeastern Sichuan Basin[J].Lithologic Reservoirs,2014,26(4):103-109.
[43] 冯旭,刘洛夫,李朝玮,等.碎屑岩孔隙演化定量计算方法的改进和应用[J].石油与天然气地质,2017(6):1198-1207. Feng Xu,Liu Luofu,Li Chaowei,et al.Improvement and application of quantitative calculation of porosity evolution of clastic rock[J].Oil & Gas Geology,2017(6):1198-1207.
[44] 王艳忠,操应长,葸克来,等.碎屑岩储层地质历史时期孔隙度演化恢复方法——以济阳坳陷东营凹陷沙河街组四段上亚段为例[J].石油学报,2013,34(6):1100-1111. Wang Yanzhong,Cao Yingchang,Xi Kelai,et al.A recovery method for porosity evolution of clastic reservoirs with geological time:a case study from the upper submember of Es₄ in the Dongying depression,Jiyang subbasin[J].Acta Petrolei Sinica,2013,34(6):1100-1111.