Special Oil & Gas Reservoirs >

2024 , Vol. 31 >Issue 5: 31 - 40

DOI: https://doi.org/10.3969/j.issn.1006-6535.2024.05.004

Geologic Exploration

Microscopic Pore Structure Characteristics and Classification Evaluation of Tight Sandstone Gas Reservoirs in the Zhongba Area of Western Sichuan

  • Liu Lin ,
  • Liu Xiangjun ,
  • Sang Qin ,
  • Xiong Jian ,
  • Li Wei ,
  • Liang Lixi
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  • 1. Geosciences and Technology,Southwest Petroleum University,Chengdu,Sichuan 610500,China;
    2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu,Sichuan 610500,China

Received date: 2023-11-27

  Revised date: 2024-06-25

  Online published: 2024-12-24

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Abstract

The tight sandstone reservoirs in Zhongba Area of western Sichuan have experienced complex sedimentation and diagenesis evolution,resulting in poor reservoir physical properties,complex pore structure and strong heterogeneity,which makes it difficult to effectively evaluate the reservoir and to predict the"sweet spots".To address this issue,this study focused on the tight sandstone reservoirs of the Xujiahe Formation in the Zhongba Area,and systematically evaluated the microscopic pore structure characteristics of the reservoirs based on rock physics experiments including porosity and permeability from gas logging,casting thin sections,high-pressure mercury intrusion,and scanning electron microscope.Additionally,reservoir classification and well logging evaluation are conducted to determine the development and distribution characteristics of high-quality reservoirs with flow unit theory and BP neural network technology.The results show that the physical properties of the target reservoirs in the study area are poor,the reservoir space is mainly secondary intergranular pores and dissolution pores,the throat types are mainly point-like and necked,and the pore size is mainly nano-submicron.Reservoirs are classified into four types(Ⅰ-Ⅳ)based on flow unit.The Flow Zone Index (FZI) can effectively characterize the pore structure and flow characteristics of the reservoirs.Type Ⅱ and Ⅲ reservoirs are mainly developed in the second member of Xujiahe Formation in the study area,and type I reservoirs are developed in the ZB9-65-46 well field in the middle of the gas reservoir.The main structural reservoirs in the Zhongba Area are thick,predominantly type Ⅱ,while the reservoirs in the Laopingba and structural saddles are mostly thin layers,mainly type Ⅲ.Vertically,the effective reservoirs are primarily developed in the upper part of the second member of Xujiahe Formation,and its thickness accounts for 73.60% of the total reservoir thickness.The research results provide a scientific basis for reservoir evaluation and efficient development of similar tight sandstone gas reservoirs.

Key words： tight sandstone; pore structure; flow unit; reservoir evaluation; Xujiahe Formation

Cite this article

Liu Lin , Liu Xiangjun , Sang Qin , Xiong Jian , Li Wei , Liang Lixi . Microscopic Pore Structure Characteristics and Classification Evaluation of Tight Sandstone Gas Reservoirs in the Zhongba Area of Western Sichuan[J]. Special Oil & Gas Reservoirs, 2024 , 31(5) : 31 -40 . DOI: 10.3969/j.issn.1006-6535.2024.05.004

References

[1] 戴金星,倪云燕,吴小奇.中国致密砂岩气及在勘探开发上的重要意义[J].石油勘探与开发,2012,39(3):257-264.
DAI Jinxing,NI Yunyan,WU Xiaoqi.Tight gas in China and its significance in exploration and exploitation[J].Petroleum Exploration and Development,2012,39(3):257-264.
[2] 柴汝宽,刘月田,何宇廷,等.鄂尔多斯盆地延长组致密砂岩油藏低盐度水驱作用规律[J].大庆石油地质与开发,2022,41(2):67-74.
CHAI Rukuan,LIU Yuetian,HE Yuting,et al. Low salinity waterflooding laws in the tight sandstone oil reservoirs of Yanchang Formation in Ordos Basin[J]. Petroleum Geology & Oilfield Development in Daqing,2022,41(2):67-74.
[3] 王卓,赵靖舟,孟选刚,等.鄂尔多斯盆地东南部柴上塬区三叠系延长组长6致密油成藏主控因素及富集规律[J].石油实验地质,2022,44(2): 251-261.
WANG Zhuo,ZHAO Jingzhou,MENG Xuangang,et al.Key controlling factors and enrichment mechanisms of tight reservoirs in 6th Member of Triassic Yanchang Formation,Chaishangyuan Area,southeastern Ordos Basin[J].Petroleum Geology & Experiment,2022,44(2): 251-261.
[4] 董献宇,祖琳,杨正明,等. 基于核磁共振实验的纳米驱油剂驱油效果:以大庆外围油田特低渗致密储层为例[J].大庆石油地质与开发,2022,41(4):107-115.
DONG Xianyu,ZU Lin,YANG Zhengming,et al. Displacement effect by nano oil displacement agent based on NMR experiment:taking ultra-low permeability tight reservoirs of Daqing peripheral oilfields as examples[J]. Petroleum Geology & Oilfield Development in Daqing,2022,41(4):107-115.
[5] 郭江峰,徐陈昱,谢然红,等. 含微裂缝致密砂岩核磁共振响应机理研究[J]. 石油钻探技术,2022, 50(4):121-128.
GUO Jiangfeng, XU Chenyu, XIE Ranhong, et al. Study on the NMR response mechanism of micro-fractured tight sandstones [J]. Petroleum Drilling Techniques,2022, 50(4):121-128.
[6] 赵宁,王亮,张磊,等.基于粒径分类的致密砂岩力学特性及破坏特征研究——以鄂尔多斯盆地二叠系下石盒子组为例[J].石油实验地质,2022,44(4): 720-729.
ZHAO Ning,WANG Liang,ZHANG Lei,et al.Mechanical properties and fracturing characteristics of tight sandstones based on granularity classification: a case study of Permian Lower Shihezi Formation,Ordos Basin[J].Petroleum Geology & Experiment,2022,44(4): 720-729.
[7] 孟婧,张莉莹,李芮,等.致密砂岩储层微观孔隙结构特征及其分类评价[J].特种油气藏,2023,30(4):71-78.
MENG Jing,ZHANG Liying,LI Rui,et al.Microscopic pore structure characteristics of tight sandstone reservoirs and its classification evaluation[J].Special Oil & Gas Reservoirs,2023,30(4):71-78.
[8] 王瑞飞,陈明强,孙卫.特低渗透砂岩储层微观孔隙结构分类评价[J].地球学报,2008,29(2):213-220.
WANG Ruifei,CHEN Mingqiang,SUN Wei.Classification and evaluation of micro-pore structures in the ultra-low permeability sandstone reservoir[J].Acta Geoscientica Sinica,2008,29(2):213-220.
[9] 彭军,韩浩东,夏青松,等.深埋藏致密砂岩储层微观孔隙结构的分形表征及成因机理——以塔里木盆地顺托果勒地区柯坪塔格组为例[J].石油学报,2018,39(7):775-791.
PENG Jun,HAN Haodong,XIA Qingsong,et al.Fractal characterization and genetic mechanism of micro-pore structure in deeply buried tight sandstone reservoirs:a case study of Kalpintag Formation in Shuntuoguole Area,Tarim Basin[J].Acta Petrolei Sinica,2018,39(7):775-791.
[10] 韩博华,王飞,刘倩茹,等.测井储层分类评价方法研究进展综述[J].地球物理学进展,2021,36(5):1966-1974.
HAN Bohua,WANG Fei,LIU Qianru,et al.Review of research progress on evaluation of logging reservoir classification methods[J].Progress in Geophysics,2021,36(5):1966-1974.
[11] 薛永超,李惠,余钟,等.低渗储层微观孔喉半径划分流动单元方法[J].特种油气藏,2019,26(6):52-57.
XUE Yongchao,LI Hui,YU Zhong,et al.Flow unit division with microscopic pore-throat radius in low-permeability reservoir[J].Special Oil & Gas Reservoirs,2019,26(6):52-57.
[12] 刘钰铭,侯加根,王兴明,等.断块油气田非均质储层流动单元评价[J].天然气地球科学,2010,21(1):168-171.
LIU Yuming,HOU Jiagen,WANG Xingming,et al.Flow units of heterogeneous reservoir in faulted blocks oilfield[J].Natural Gas Geoscience,2010,21(1):168-171.
[13] 唐民安,李建明,孙宝玲,等.鄂尔多斯盆地红河油田长8油层组储层流动单元研究[J].地质科技情报,2014,33(6):83-87.
TANG Min′an,LI Jianming,SUN Baoling,et al.Reservoir flow units of Chang 8 oil-bearing formation in Honghe Oilfield,Ordos Basin[J].Bulletin of Geological Science and Technology,2014,33(6):83-87.
[14] 郑红军,苟迎春,张瀛,等.利用储集层非均质性分维模型研究流动单元[J].西南石油大学学报(自然科学版),2008,30(1):18-21.
ZHENG Hongjun,GAO Yingchun,ZHANG Ying,et al.Research on flow unit by using fractal dimension model of reservoir heterogeneity[J].Journal of Southwest Petroleum University (Science & technology Edition),2008,30(1):18-21.
[15] AMAEFULE J O,ALTUNBAY M,TIAB D,et al.Enhanced reservoir description:using core and log data to identify hydraulic (flow) units and predict permeability in uncored intervals/wells[C].SPE26436,1993:205-220.
[16] 赵军,江同文,王焕增,等.基于流动单元的碳酸盐岩渗透率建模方法[J].天然气工业,2007,27(2):46-48.
ZHAO Jun,JIANG Tongwen,WANG Huanzeng,et al.Flow-unit-based modeling of carbonate reservoir permeability[J].Natural Gas Industry,2007,27(2):46-48.
[17] 李玮,祗淑华,胡少华.基于流动单元方法的中低渗砂岩储层物性划分[J].长江大学学报(自然科学版),2013,10(32):83-84.
LI Wei,ZHI Shuhua,HU Shaohua.Physical property division of medium-low permeability sandstone reservoirs based on flow unit method[J].Journal of Yangtze University (Natural Science Edition),2013,10(32):83-84.
[18] OWEN A,EBINGHAUS A,Hartley A J,et al.Multi-scale classification of fluvial architecture:an example from the Palaeocene-Eocene Bighorn Basin,Wyoming[J].Sedimentology,2017,64(6):1572-1596.
[19] 王猛,董宇,张志强,等.高精度流动单元分类方法及应用[J].断块油气田,2022,29(1):89-94.
WANG Meng,DONG Yu,ZHANG Zhiqiang,et al.High-precision classification method and application of flow unit[J].Fault Block Oil & Gas Field,2022,29(1):89-94.
[20] 杨鉴,姚江,周斌,等.中坝气田须二气藏动态特征分析[J].天然气工业,2000,20(5):91.
YANG Jian,YAO Jiang,ZHOU Bin,et al.Dynamic characteristics analysis of the Xujiahe-2 gas reservoir in the Zhongba Gas Field[J].Natural Gas Industry,2000,20(5):91.
[21] 何琰,张引来,吴念胜.用分形几何法预测毛管压力曲线[J].新疆石油地质,2004,25(6):647-649.
HE Yan,ZHANG Yinlai,WU Niansheng.Application of fractal geometry to prediction of capillary pressure curves[J].Xinjiang Petroleum Geology,2004,25(6):647-649.
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