Characteristics of parametamorphic rock reservoirs in Pingxi area, Qaidam Basin, NW China
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摘要
Based on core, thin-section, scanning electron microscopy(SEM) and well logging data, the characteristics of the parametamorphic rock reservoirs in the Pingxi area were analyzed by means of whole rock X-ray diffraction and micron CT scanning. The parametamorphic rock reservoirs mainly had three types of rocks: slate, crystalline limestone and calc-schist; the original rocks were Ordovician-Silurian marine clastic and carbonate rocks. The three types of parametamorphic rock reservoirs developed three types and six sub-types of reservoir space. The first type of reservoir space was fractures, including structural, weathered and dissolution fractures; the second type was dissolved porosities, including dissolved pores and caves; the third type was nano-sized intercrystalline porosities. The three types of parametamorphic rock reservoirs were different widely in the quantity, volume and radius of pore-throats, and were strongly affected by the type and development degree of fractures. The parametamorphic rock reservoirs were formed by metamorphism, weathering, structural fragmentation and dissolution. Metamorphism reformed the parametamorphic rock reservoirs significantly, breaking the traditional constraint of finding weathering crust at top. The parametamorphic rock reservoirs experienced five formation stages, and their distribution was controlled by rock type, metamorphic degree, ancient geomorphology, and weathering intensity.
Based on core, thin-section, scanning electron microscopy(SEM) and well logging data, the characteristics of the parametamorphic rock reservoirs in the Pingxi area were analyzed by means of whole rock X-ray diffraction and micron CT scanning. The parametamorphic rock reservoirs mainly had three types of rocks: slate, crystalline limestone and calc-schist; the original rocks were Ordovician-Silurian marine clastic and carbonate rocks. The three types of parametamorphic rock reservoirs developed three types and six sub-types of reservoir space. The first type of reservoir space was fractures, including structural, weathered and dissolution fractures; the second type was dissolved porosities, including dissolved pores and caves; the third type was nano-sized intercrystalline porosities. The three types of parametamorphic rock reservoirs were different widely in the quantity, volume and radius of pore-throats, and were strongly affected by the type and development degree of fractures. The parametamorphic rock reservoirs were formed by metamorphism, weathering, structural fragmentation and dissolution. Metamorphism reformed the parametamorphic rock reservoirs significantly, breaking the traditional constraint of finding weathering crust at top. The parametamorphic rock reservoirs experienced five formation stages, and their distribution was controlled by rock type, metamorphic degree, ancient geomorphology, and weathering intensity.
Based on core, thin-section, scanning electron microscopy(SEM) and well logging data, the characteristics of the parametamorphic rock reservoirs in the Pingxi area were analyzed by means of whole rock X-ray diffraction and micron CT scanning. The parametamorphic rock reservoirs mainly had three types of rocks: slate, crystalline limestone and calc-schist; the original rocks were Ordovician-Silurian marine clastic and carbonate rocks. The three types of parametamorphic rock reservoirs developed three types and six sub-types of reservoir space. The first type of reservoir space was fractures, including structural, weathered and dissolution fractures; the second type was dissolved porosities, including dissolved pores and caves; the third type was nano-sized intercrystalline porosities. The three types of parametamorphic rock reservoirs were different widely in the quantity, volume and radius of pore-throats, and were strongly affected by the type and development degree of fractures. The parametamorphic rock reservoirs were formed by metamorphism, weathering, structural fragmentation and dissolution. Metamorphism reformed the parametamorphic rock reservoirs significantly, breaking the traditional constraint of finding weathering crust at top. The parametamorphic rock reservoirs experienced five formation stages, and their distribution was controlled by rock type, metamorphic degree, ancient geomorphology, and weathering intensity.
引文
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[2]YUAN Shiyi,WANG Qiang.New progress and prospect of oilfields development technologies in China.Petroleum Exploration and Development,2018,45(4):657-668.
[3]ELIKF,DELALOYE M F.Characteristics of ophiolite-related metamorphic rocks in the Beysehir ophiolitic me′lange(Central Taurides,Turkey),deduced from whole rock and mineral chemistry.Journal of Asian Earth Sciences,2006,26(5):461-476.
[4]BROGI A.Foliation relationships and structural facing vs.vergence determinations in refolded low-grade metamorphic rocks:An example from the Tuscan Metamorphic‘Basement’(Northern Apennines,Italy).Journal of Structural Geology,2006,28(1):115-128.
[5]KISCH H J.Development of slaty cleavage and degree of very-low-grade metamorphism:A review.Journal of Metamorphic Geology,2007,9(6):735-750.
[6]MENG Weigong,LI Xiaoguang,LIU Baohong.Main factors controlling the formation of interior reservoirs in the metamorphic paleo-buried hills of the Liaohe Depression.Oil&Gas Geology,2007,28(5):584-589.
[7]ZHOU Xinhuai,XIANG Hua,YU Shui,et al.Reservoir characteristics and development controlling factors of JZSNeo-Archean metamorphic buried hill oil pool in Bohai Sea.Petroleum Exploration and Development,2005,32(6):17-20.
[8]SONG Bairong,HU Yingjie,BIAN Shaozhi,et al.Reservoir characteristics of the crystal basement in the Xinglongtai buriedhill,Liaohe Depression.Acta Petrolei Sinica,2011,32(1):77-82.
[9]TONG Kaijun,ZHAO Chunming,LYU Zuobin,et al.Reservoir evaluation and fracture characterization of the metamorphic buried hill reservoir in Bohai Bay.Petroleum Exploration and Development,2012,39(1):56-63.
[10]LIU Le,YANG Minghui,LI Chunxia,et al.Fractured reservoirs in metamorphic buried-hills in the Liaoxi low uplift and their hydrocarbon accumulation conditions.Oil&Gas Geology,2009,30(2):188-194.
[11]LIN Songhui,WANG Hua,ZHANG Guixia,et al.Pool features of buried hill in west part of Dongying Depression.Oil&Gas Geology,2000,21(4):360-363.
[12]ZHANG Jiguang,WANG Jinkui,QIN Longbo,et al.Characteristics of metamorphic buried hill reservoir in Sude’erte of Beir Fault Depression in Hailar Basin.Acta Petrolei Sinica,2007,28(4):21-25.
[13]WANG Yuhua,ZHANG Jiguang,ZHANG Haijun.Reservoir characteristics and exploration method of metamorphic rock in Budate Group in Beier Rift of Hailaer Basin.Petroleum Geology&Oilfield Development in Daqing,2007,26(2):23-30.
[14]FENG Zihui,SUN Chunlin,LIU Wei,et al.Organic geochemistry of epimetamorphic rock in basement of the Songliao Basin.Geochimica,2005,34(1):73-78.
[15]YANG Chun,DAI Jinxing,CHEN Hanlin,et al.Pyrolysis experiment and reservoir-forming potential of epimetamorphic rock.Petroleum Exploration and Development,2009,36(2):200-207.
[16]CHEN Yan.Description of metamorphic bedrock reservoir in Mabei oilfield,Qaidam Basin.Wuhan:China University of Geosciences,2010.
[17]LI Jianming,SHI Lingling,WANG Liqun,et al.Characteristics of basement reservoir in Kunbei fault terrace belt in southwestern Qaidam Basin.Lithologic Reservoirs,2011,23(2):20-23.
[18]MA Feng,YAN Cunfeng,MA Dade,et al.Bedrock gas reservoirs in Dongping area of Qaidam Basin,NW China.Petroleum Exploration and Development,2015,42(3):266-273.
[19]JU Yinjuan,ZHANG Xiaoli,ZHANG Yongshu.Geochronology of bedrocks in Altyn Mountain in the Northwestern Edge of Qaidam Basin.Liaoning Chemical Industry,2018,47(1):28-29.
[20]WANG Long,YU Feng,LIU Zhixian,et al.Reconstruction of protoliths of metamorphic rocks of the Tuolai Group and its tectonic setting.Geological Bulletin of China,2016,35(9):1448-1455.
[21]National Energy Administration.Evaluation method of oil and gas reservoirs:SY/T 6285-2011.Beijing:Petroleum Industry Press,2011.
[22]LIU Zhanguo,ZHU Chao,LI Senming,et al.Geological features and exploration fields of tight oil in the Cenozoic of western Qaidam Basin,NW China.Petroleum Exploration and Development,2017,44(2):196-204.
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