Lithologic Reservoirs ›› 2024, Vol. 36 ›› Issue (3): 1-18.doi: 10.12108/yxyqc.20240301

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Characteristics and significance of micron pores and micron fractures in shale oil reservoirs of Cretaceous Qingshankou Formation in Gulong sag，Songliao Basin

HE Wenyuan1, ZHAO Ying2, ZHONG Jianhua3,4, SUN Ningliang3   

  1. 1. China National Oil and Gas Exploration and Development Company Ltd., Beijing 100032, China;
    2. Heilongjiang Provincial Key Laboratory of Continental Shale Oil, Daqing 163712, Heilongjiang, China;
    3. Ocean Engineering Research Institute, Northeastern University, Qinhuangdao 066004, Hebei, China;
    4. School of Geosciences, China University of Petroleum (East China), Qingdao 266580, Shandong, China
  • Received:2023-03-13 Revised:2023-08-22 Online:2024-05-01 Published:2024-04-30

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Abstract: By means of core observation, thin section identification, electron backscattering, secondary imaging and energy spectrum analysis, the micron pores and micron fractures in shale oil reservoirs of Cretaceous Qing‐ shankou Formation in Gulong sag of Songliao Basin were studied. The results show that:（1）The lithologies of shale oil reservoirs in Gulong sag are fine-grained clastic rocks dominated by shale, and the mineral composition is mainly clay and felsic, showing the characteristics of mudstone or shale in structure, and the whole reservoir is felsic shale. Micron pores and micron fractures are developed in reservoirs with various types.（2）The diameter of micron pores in the study area is generally 1-2 μm, and the maximum can reach 70 μm, and they are nearly round, oblate, polygonal and irregular. According to the genesis, they can be divided into six types:compaction stress shielding pores, diagenetic authigenic pores, dissolved pores, hydrocarbon generation and expulsion expansion pores, organic matter pores and diatom residual pores. Compaction stress shielding pores are mostly developed on both sides of rigid minerals. Diagenetic authigenic pores are often developed in authigenic minerals such as dolo‐ mite, chlorite and illite, mainly intergranular pores. Dissolved pores are mostly developed in carbonate minerals, and secondary mycelial floccules can be seen inside. Hydrocarbon generation and expulsion expansion pores are mostly produced in vertical or nearly vertical rows, which is related to the secondary hydrocarbon generation and expulsion formed by light oil. Organic matter pores develop in organic matter and are related to residual cells of plants and filling of light oil and natural gas. Diatom residual pores mainly develop in the interior and edge of dia‐ toms, with large sizes ranging from several microns to tens of microns.（3）The micron fractures in the study area are mainly bedding, with a width of 1-10 μm and a maximum of 100 μm, and a length of several microns to tens of microns. They can be divided into four types:diagenetic shrinkage fractures, dissolved fractures, hydrocarbon generation and expulsion expansion fractures and structural/shear fractures. The diagenetic shrinkage fractures are mainly tensile fractures, with curved fractures and uneven fracture wall. The width of dissolved fractures can reach 60-70 μm, authigenic clay can be seen in the fractures, and authigenic minerals such as pyrite, apatite and dolomite can be found on both sides of the fracture. Both sides of hydrocarbon generation and expulsion expan‐ sion fractures are jagged and uneven, bypassing rigid minerals. Structural/shear micron fractures are generally straight, accompanied by other fractures related to shear.（4）The connectivity between pores and fractures of dif‐ ferent scales in the study area is good, forming a three-level reservoir and transport system of“nano-pores + nanofractures, micron-pores + micron-fractures, millimeter-pores + millimeter-fractures”.

Key words: micron pore, micron fracture, reservoir space, connectivity, shale oil reservoir, Qingshankou Formation, Cretaceous, Gulong sag, Songliao Basin

CLC Number: 

  • TE122.2
[1] 邹才能,张国生,杨智,等. 非常规油气概念、特征、潜力及技术:兼论非常规油气地质学[J]. 石油勘探与开发,2013,40(4):385-454. ZOU Caineng,ZHANG Guosheng,YANG Zhi,et al. Geological concepts,characteristics,resource potential and key techniques of unconventional hydrocarbon:On unconventional petroleum geology[J]. Petroleum Exploration and Development,2013,40(4):385-454.
[2] 金之钧,白振瑞,高波,等. 中国迎来页岩油气革命了吗?[J]. 石油与天然气地质,2019,40(3):451-458. JIN Zhijun,BAI Zhenrui,GAO Bo,et al. Has China ushered in the shale oil and gas revolution?[J]. Oil & Gas Geology,2019, 40(3):451-458.
[3] 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.
[4] 庞彦明,张元庆,蔡敏,等. 松辽盆地古龙页岩油水平井开发技术经济界限[J]. 大庆石油地质与开发,2021,40(5):134-143. PANG Yanming,ZHANG Yuanqing,CAI Min,et al. Technical and economic limit of horizontal well development for Gulong shale oil in Songliao Basin[J]. Petroleum Geology & Oilfield Development in Daqing,2021,40(5):134-143.
[5] 高瑞祺. 泥岩异常高压带油气的生成排出特征与泥岩裂缝油气藏的形成[J]. 大庆石油地质与开发,1984,3(1):160-167. GAO Ruiqi. Characteristics of petroleum generation and expulsion in abnormal pressure shale zones and the formation of fractured shale reservoirs[J]. Petroleum Geology & Oilfield Development in Daqing,1984,3(1):160-167.
[6] 孙龙德. 古龙页岩油(代序)[J]. 大庆石油地质与开发, 2020,39(3):1-7. SUN Longde. Gulong shale oil(preface)[J]. Petroleum Geology & Oilfield Development in Daqing,2020,39(3):1-7.
[7] 何文渊,蒙启安,张金友. 松辽盆地古龙页岩油富集主控因素及分类评价[J]. 大庆石油地质与开发,2021,40(5):1-12. HE Wenyuan,MENG Qi'an,ZHANG Jinyou. Controlling factors and their classification-evaluation of Gulong shale oil enrichment in Songliao Basin[J]. Petroleum Geology & Oilfield Development in Daqing,2021,40(5):1-12.
[8] 何文渊. 松辽盆地古龙页岩油储层黏土中纳米孔和纳米缝的发现及其意义[J]. 大庆石油地质与开发,2022,41(1):1-15. HE Wenyuan. Discovery and significance of nano pores and nano fractures of clay in Gulong shale oil reservoir in Songliao Basin[J]. Petroleum Geology & Oilfield Development in Daqing, 2022,41(1):1-15.
[9] 何文渊,崔宝文,王凤兰,等. 松辽盆地古龙凹陷白垩系青山口组储集空间与油态研究[J]. 地质论评,2022,68(2):693-741. HE Wenyuan,CUI Baowen,WANG Fenglan,et al. Study on reservoir spaces and oil states of the Cretaceous Qingshankou Formation in Gulong Sag,Songliao Basin[J]. Geological Review, 2022,68(2):693-741.
[10] 何文渊,蒙启安,冯子辉,等. 松辽盆地古龙页岩油原位成藏理论认识及勘探开发实践[J]. 石油学报,2022,43(1):1-13. HE Wenyuan,MENG Qi'an,FENG Zihui,et al. In-situ accumulation theory and exploration & development practice of Gulong shale oil in Songliao Basin[J]. Acta Petrolei Sinica,2022,43(1):1-13.
[11] 王凤兰,付志国,王建凯,等. 松辽盆地古龙页岩油储层特征及分类评价[J]. 大庆石油地质与开发,2021,40(5):144-156. WANG Fenglan,FU Zhiguo,WANG Jiankai,et al. Characteristics and classification evaluation of Gulong shale oil reservoir in Songliao Basin[J]. Petroleum Geology & Oilfield Development in Daqing,2021,40(5):144-156.
[12] 王广昀,王凤兰,蒙启安,等. 古龙页岩油战略意义及攻关方向[J]. 大庆石油地质与开发,2020,39(3):8-19. WANG Guangyun,WANG Fenglan,MENG Qi'an,et al. Strategic significance and research direction for Gulong shale oil[J]. Petroleum Geology & Oilfield Development in Daqing,2020, 39(3):8-19.
[13] 崔宝文,张顺,付秀丽,等. 松辽盆地古龙页岩有机层序地层划分及影响因素[J]. 大庆石油地质与开发,2021,40(5):13-28. CUI Baowen,ZHANG Shun,FU Xiuli,et al. Organic sequence stratigraphic division and its influencing factors'analysis for Gulong shale in Songliao Basin[J]. Petroleum Geology & Oilfield Development in Daqing,2021,40(5):13-28.
[14] 王永卓,王瑞,代旭,等. 松辽盆地古龙页岩油水平井箱体开发设计方法[J]. 大庆石油地质与开发,2021,40(5):157-169. WANG Yongzhuo,WANG Rui,DAI Xu,et al. Compartment development design method of horizontal well for Gulong shale oil in Songliao Basin[J]. Petroleum Geology & Oilfield Development in Daqing,2021,40(5):157-169.
[15] 冯子辉,霍秋立,曾花森,等. 松辽盆地古龙页岩有机质组成与有机质孔形成演化[J]. 大庆石油地质与开发,2021,40(5):40-55. FENG Zihui,HUO Qiuli,ZENG Huasen,et al. Organic matter compositions and organic pore evolution in Gulong shale of Songliao Basin[J]. Petroleum Geology & Oilfield Development in Daqing,2021,40(5):40-55.
[16] 邵红梅,高波,潘会芳,等. 松辽盆地古龙页岩成岩-孔隙演化[J]. 大庆石油地质与开发,2021,40(5):56-67. SHAO Hongmei,GAO Bo,PAN Huifang,et al. Diagenesis-pore evolution for Gulong shale in Songliao Basin[J]. Petroleum Geology & Oilfield Development in Daqing,2021,40(5):56-67.
[17] 刘德来,陈发景,关德范,等. 松辽盆地形成、发展与岩石圈动力学[J]. 地质科学,1996,31(4):397-408. LIU Delai,CHEN Fajing,GUAN Defan,et al. A study on lithospheric dynamics of the origin and evolution in the Songliao Basin[J]. Scientia Geologica Sinica,1996,31(4):397-408.
[18] 陈昭年,陈发景. 松辽盆地反转构造运动学特征[J]. 现代地质,1996,10(3):390-396. CHEN Zhaonian,CHEN Fajing. Kinematic characteristics of inversion structure in Songliao Basin[J]. Geoscience-Journal of Graduate School,China University of Geosciences,1996,10(3):390-396.
[19] SONG Ying,STEPASHKO A,LIU Keyu,et al. Post-rift tectonic history of the Songliao Basin,NE China:Cooling events and postrift unconformities driven by orogenic pulses from plate boundaries[J]. Journal of Geophysical Research:Solid Earth,2018, 123:2363-2395.
[20] SCHIEBER J,REMUS L,KEVIN B,et al. An SEM study of porosity in the eagle ford shale of texas:Pore types and porosity distribution in a depositional and sequence stratigraphic context[G]//BREYER J A. AAPG Memoir 110,2016:167-186.
[21] LOUCKS R G,REED R M,RUPPEL S,et al. Spectrum of pore types and networks in mudrocks and a descriptive classification for matrix related mudrock pores[J]. AAPG Bulletin, 2012,96(6):1071-1098.
[22] SCHIEBER J. Shale microfabrics and pore development:An overview with emphasis on the importance of depositional processes[R]. Calgary:CSPG CSEG CWLS Annual Convention, 2011.
[23] SCHIEBER J. Common themes in the formation and preservation of intrinsic porosity in shale and mudstones-illustrated with examples across the phanerozoic[J]. SPE 132370,2010.
[24] SALMAN B,ROBERT H L,LINDA B. Anomalously high porosity and permeability in deeply buried sandstone reservoirs:Origin and predictability[J]. AAPG Bulletin,2002,86(2):301-328.
[25] LOUCKS R G,REED R M,RUPPEL S C,et al. Preliminary classification of matrix pores in mudrocks[J]. Gulf Coast Association of Geological Societies Transactions,2010,60:435-441.
[26] PIERCE J W,NICHOLS M M. Change of particle composition from fluvial into an estuarine environment:Rappahannock river, Virginia[J]. Journal of Coastal,1986,2(4):419-425.
[27] 何文渊,赵莹,钟建华,等. 松辽盆地古龙凹陷青山口组页岩油储层中有机质微孔特征[J]. 地质论评,地质论评,2023,69(3):1161-1183. HE Wenyuan,ZHAO Ying,ZHONG Jianhua,et al. Study on organic matter and micropores of Qingshankou Formation shale oil reservoir in Gulong Sag,Songliao Basin[J]. Geological Review,2023,69(3):1161-1183.
[28] KWON O A K,KRONENBERG A F,GANGI B J,et al. Permeability of illite bearing shale:1. Anisotropy and effects of clay content and loading[J]. Journal of Geophysical Research Atmospheres,2004,109:B10205.
[29] NILS K,RAINER D,MANFRED S. Polycationic Peptides from diatom biosilica that direct silica nanosphere formation[J]. Science,1999,286(5):1129-1132.
[30] CONTRERAS A,GARCÍA F,MOLINA E,et al. Interaction between CO 2-mass transfer,light availability,and hydrodynamic stress in the growth of Phaeodactylum tricornutum in a concentric tube airlift photobioreactor[J]. Biotechnology & Bioengineering,1998,60(3):317-325.
[31] 孙宗颀,张国报,张景和. 在地质断层构造中地应力状态演变研究[J]. 石油勘探与开发,2000,27(1):102-105. SUN Zongqi,ZHANG Guobao,ZHANG Jinghe. Study of in situ stress state evolution in geologic fault structure[J]. Petroleum Exploration and Development,2000,27(1):102-105.
[32] DURANTI D,HURST A,BELL C,et al. Injected and remobilized Eocene sandstones from the Alba Field,UKCS:Core and wireline log charact eristics[J]. Petroleum Geoscience,2002,8(2):99-107.
[33] 马锋,刘立,钟建华,等. 大港滩海区沙一段下部水力破裂特征模拟实验[J]. 石油学报,2006,27(6):60-69. MA Feng,LIU Li,ZHONG Jianhua,et al. Modeling on characteristics of hydraulic fracturing in the lower first member of Shahejie Formation in Dagang beach[J]. Acta Petrolei Sinica, 2006,27(6):60-69.
[34] DOYLE E H,MCCLELLAND B H,FERGUSON G H. Wire line vane probe for deep penetration measurements of ocean sediment strength[R]. Houston,Texas:Offshore Technology Conference Preprints,1971.
[35] BEA R G,ARNOLD. Movements and forces developed by wave induced slides in soft clay[R]. Houston,TX:Fifth Annual Offshore Technology Conference,1973.
[36] MOON C F,HURST C W. Fabric of muds and shales:An overview[J]. Geological Society,London,Special Publications,1984, 15(1):579-593.
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