库车坳陷克拉2气田油气充注和超压对储层孔隙的影响

doi:10.11743/ogg20160615

摘要/Abstract

摘要： 为了研究库车坳陷克拉2气田砂岩储层孔隙物性影响因素，在对克拉2气田砂岩储层特征和超压成因研究基础之上，采用颗粒定量荧光和流体包裹体技术确定古油水界面和油气充注史，并分析油气充注和超压与储层孔隙之间的关系。研究结果表明，库车坳陷克拉2气田泥岩和砂岩中超压形成与水平构造挤压作用具有重要关系。克拉2气田盐下砂岩储层经历最大古埋藏深度达6 000 m以上却显示出异常高的原生孔隙度是因为原油充注到储层中在比较好的盐岩盖层封闭条件下，砂岩储层孔隙中的油没有被排出使砂岩储层胶结作用减弱或者形成欠压实。其主要证据有：①高的定量荧光参数QGF指数和QGF-E强度对应的砂岩储层孔隙度和渗透率也比较高，而在古油水界面之下，砂岩孔隙度和渗透率都很低；②库车坳陷克拉2气田晚期油充注发生库车组沉积早期，对应砂岩储层的埋藏深度比较小，孔隙度比较高。研究表明深层砂岩储层油充注和超压发育对储层孔隙具有重要影响。

关键词: 油气充注, 古油-水界面, 储层孔隙, 克拉2气田, 塔里木盆地

Abstract: In order to investigate the factors controlling reservoir porosity in the Kela-2 gas field of the Kuqa Depression,Tarim Basin,the sandstone reservoir characteristics,the origin of overpressure,as well as the evolution of the reservoir charging history were studied by using quantitative grain fluorescence and fluid inclusion data.The research results indicate that horizontal tectonic compression played an important role in the overpressure generation in the Kela-2 gas field.The overpressured presalt sandstone reservoirs with the maximum paleoburial depth over 6 000 m have anomalously high primary porosities.The reason is that the cementation of the sandstone was influenced and even undercompaction occurred as the oil charged into the sandstone reservoirs was not expelled under the efective sealing of salt and gypsum cap rocks in the Kela-2 gas field.This is evidenced by that sandstone reservoirs with high intensities of Quantitative Grain Fluorescence (QGF) and QGF on extract (QGF-E) are associated with high porosity and permeability intervals,and sandstone units below the ancient oil-water contact have low porosity and permeability.Late oil charging occurred at the early period of the Kuqa Formation deposition and the corresponding sandstone reservoirs in the Kela-2 gas field had shallower burial depth and high primary porosities.This research suggests that the oil charging and overpressure played important roles in the development of reservoirs porosity.

Key words: hydrocarbon charging, ancient oil-water contact, reservoir porosity, Kela-2 gas field, Tarim Basin

中图分类号:

TE112.1

郭小文,刘可禹,宋岩,等. 库车坳陷克拉2气田油气充注和超压对储层孔隙的影响[J]. 石油与天然气地质, 2016, 37(6): 935-943. doi: 10.11743/ogg20160615 Guo Xiaowen,Liu Keyu,Song Yan,et al. Influences of hydrocarbon charging and overpressure on reservoir porosity in Kela-2 gas field of the Kuqa Depression,Tarim Basin[J]. Oil & Gas Geology, 2016, 37(6): 935-943. doi: 10.11743/ogg20160615

参考文献

[1] Dickinson G.Geological aspects of abnormal reservoir pressures in Gulf Coast Louisiana[J].AAPG Bulletin,1951,37(2):410-432.
[2] Barker C.Aquathermal pressuring-role temperature in development of abnormal-pressure zones[J].AAPG Bulletin,1972,56(10):2068-2071.
[3] Magara K.Importance of aquathermal pressuring effect in Gulf coast[J].AAPG Bulletin,1975,59(10):2037-2045.
[4] Freed R L,Peacor D R.Geopressured shale and sealing effect of smectite to illite transition[J].AAPG Bulletin,1989,73(10):1223-1232.
[5] Law B E,Dickinson W W.Conceptual model of origin of abnormally pressured gas accumulations in low permeability reservoirs[J].AAPG Bulletin,1985,69(8):1295-1304.
[6] Meissner F F.Abnormal electric resistivity and fluid pressure in Bakken Formation,Williston basin,and its relation to petroleum generation,migration,and accumulation(abs.)[J].AAPG Bulletin,1976,60(1):1403-1404.
[7] Spencer C W.Hydrocarbon generation as a mechanism for overpres-sing in Rocky Mountain Region[J].AAPG Bulletin,1987,71(4):368-388.
[8] Spencer C W.Overpressure reservoirs in Rocky Mountain region[J].Journal of Applied Mechanics,1976,43(2):1356-1357.
[9] Guo X W,He S,Liu K Y,et al.Oil generation as the dominant overpressure mechanism in the Cenozoic Dongying Depression,Bohai Bay Basin,China[J].AAPG Bulletin,2010,94(12):1859-1881.
[10] Guo X W,He S,Liu K Y,et al.Quantitative estimation of overpressure caused by oil generation in petroliferous basins[J].Organic Geochemistry,2011,42(11):1343-1350.
[11] Hubbert M K,Rubey W W.Role of fluid pressure in mechanics of overthrust faulting I[J].Geological Society of American Bulletin,1959,70(2):115-166.
[12] Yardley G S,Swarbrick R E.Lateral transfer:A source of additional overpressure?[J].Marine and Petroleum Geology,2000,17(4):523-537.
[13] Braun R L,Burnham A K.Mathematical model of oil generation,degradation and expulsion[J].Energy Fuels,1990,4(2):132-146.
[14] Hill R J,Tang Y C,Kaplan I R,et al.The influence of pressure on the thermal cracking of oil[J].Energy and Fuels,1996,10(4):873-882.
[15] Price L C,Wenger L M.The influence of pressure on petroleum generation and maturation as suggested by aqueous pyrolysis[J].Organic Geochemistry,1992,19(1-3):141-159.
[16] Hao F,Zou H Y,Gong Z S,et al.Hierarchies of overpressure retardation of organic matter maturation:Case studies from petroleum basins in China[J].AAPG Bulletin,2007,91(10):1467-1498.
[17] Hao F,Li S T,Dong W L,et al.Abnormal organic matter maturation in the Yinggehai Basin,offshore South China Sea:Implications for hydrocarbon expulsion and fluid migration from overpressured systems[J].Journal of Petroleum Geology,1998,21(4):427-444.
[18] Hao F,Sun Y C,Li S T,et al.Overpressure retardation of organic-matter maturation and hydrocarbon generation:A case study from the Yinggehai and Qiongdongnan basins,offshore South China Sea[J].AAPG Bulletin,1995,79(4):551-562.
[19] Carr A D.A vitrinite reflectance kinetic model incorporating overpressure retardation[J].Marine and Petroleum Geology,1999,16(4):355-377.
[20] Carr A D.Suppression and retardation of vitrinite reflectance:Part 1.Formation and significance for hydrocarbon generation[J].Journal of Petroleum Geology,2000,23(3):313-343.
[21] Carr A D.Suppression and retardation of vitrinite reflectance:Part 2.Derivation and testing of a kinetic model for suppression[J].Journal of Petroleum Geology,2000,23(4):475-496.
[22] Carr A D.Thermal history model for the South Central Graben,North Sea,derived using both tectonics and maturation[J].International Journal of Coal Geology,2003,54(1-2):3-19.
[23] Bloch S,Lander R H,Bonnell L.Anomalously high porosity and permeability in deeply buried sandstone reservoirs:Origin and predictability[J].AAPG Bulletin,2002,86(2):301-328.
[24] 贾承造,顾家裕,张光亚.库车拗陷大中型气田形成的地质条件[J].科学通报,2002,47(s1):49-55. Jia Chenzao,Gu Jiayu,Zhang Guangya.Geological constraints of giant and medium-sized gas fields in the Kuqa Depression[J].Chinese Science Bulletin,2002,47(s1):49-55.
[25] 宋岩,洪峰,夏新宇,等.异常压力与油气藏的同生关系-以库车坳陷为例[J].石油勘探与开发,2006,33(3):303-308. Song Yan,Hong Feng,Xia Xinyu,et al.Syngenesis relationship between abnormal overpressure and gas pool formation-With Kuqa Depression as an example[J].Petroleum Exploration and Development,2006,33(3):303-308.
[26] Jia C Z,Li Q M.Petroleum geology of Kela-2,the most productive gas field in China[J].Marine and Petroleum Geology,2008,25(4):335-343.
[27] Zeng L B,Wang H J,Gong L,et al.Impacts of the tectonic stress field on natural gas migration and accumulation:A case study of the Kuqa Depression in the Tarim Basin,China[J].Marine and Petroleum Geology,2010,27(7):1616-1627.
[28] Zeng L B,Liu B M.Overpressure in the Kuqa Foreland Thrust Zone,Tarim Basin,NWChina:origin and its impacts on hydrocarbon accumulation[J].Progress in Natural Science,2006,16(2):1307-1314.
[29] 施立志,王震亮,姚勇,等.塔里木盆地库车拗陷现今异常高压分布特征及其成因[J].大庆石油学院学报,2006,30(3):1-4. Shi Lizhi,Wang Zhenliang,Yao Yong,et al.Analysis of current of abnormal high pressure distribution characteristicsistic and discuss which cause of formation in Kuqa depression of Tarim basin[J].Journal of Daqing Petroleum Institute,2006,30(3):1-4.
[30] 张洪庞雄奇姜振学.库车坳陷克拉2气田超压成因研究[J].地球学报,2005,26(2):163-168. Zhang Hong,PangXiongqi,Jiang Zhenxue.A study of the overpressures of the Kela-s Gas Field in Kuqa Depression[J].Acta Geoscientica Sinica,2005,26(2):163-168.
[31] 孙明亮,柳广弟.库车坳陷克拉2气藏异常压力成因分析[J].中国石油大学学报(自然科学版),2007,31(3):18-27. Sun Mingliang,Liu Guangdi.Abnormal pressure origin analysis of Kela 2 gas pool in Kuqa depression of Tarim basin[J].Journal of China University of Petroleum,2007,31(3):18-27.
[32] 柳广弟,王雅星.库车坳陷纵向压力结构与异常高压形成机理[J].天然气工业,2006,26(9):29-31. Liu Guangdi,Wang Yaxing.Vertical pressure structure and genetic mechanism of overpressure in Kuqa Depression,the Tarim Basin[J].Natural Gas Industry,2006,26(9):29-31.
[33] 周兴熙.库车油气系统成藏作用与成藏模式[J].石油勘探与发,2001,28(2):8-10. Zhou Xingxi.The reservoir-forming process and model in the Kuqa petroleum system[J].Petroleum Exploration and Development,2001,28(2):8-10.
[34] Qiu N S,Chang J,Li J W,et al.New evidence on the Neogene uplift of South Tianshan:constraints from the(U-Th)/He and AFT ages of borehole samples of the Tarim basin and implications for hydrocarbon generation[J].International Journal of Earth Sciences,2012,101(6):1625-1643.
[35] Hermanrud C,Wensaas L,Teige G M G,et al.Shale porosities from well logs on Haltenbanken(Offshore Mid-Norway)shows no influence of overpressuring.Abnormal Pressures in Hydrocarbon Environments[J].AAPG Memoir,1998.70(70),65-85.
[36] Teige G M G,Hermanrud C,Wensaas L,et al.The lack of relationship between overpressure and porosity in North Sea and Haltenbanken shales[J].Marine and Petroleum Geology,1999.16(4):321-335.
[37] 何生,何治亮,杨智,等.准噶尔盆地腹部侏罗系超压特征和测井响应以及成因[J].地球科学-中国地质大学学报,2009,34(3):457-470. He Sheng,He Zhiliang,Yang Zhi,et al.Characteristics,well-log responses and mechanisms of overpressures within the Jurassic Formation in the Central part of Junggar Basin[J].Earth Science-Journal of China University of Geosciences,2009,34(3):457-470.
[38] Liu K Y,Eadington P,Coghlan D.Fluorescence evidence of polar hydrocarbon interaction on mineral surfaces and implications to alteration of reservoir wettability[J].Journal of Petroleum Science and Engineering,2003,39(3):275-285.
[39] Liu K Y,Eadington P.Quantitative fluorescence techniques for detecting residual oils and reconstructing hydrocarbon charge history[J].Organic Geochemistry,2005,36(7):1023-1036.
[40] Liu K Y,Eadington P,Middleton H,et al.Applying quantitative fluorescence techniques to investigate petroleum charge history of sedimentary basins in Australia and Papuan New Guinea[J].Journal of Petroleum Science and Engineering,2007,57(s1-2)139-151.
[41] 张宝民,陈建平,边立曾,等.再论塔里木盆地库车坳陷三叠纪-侏罗纪的海泛事件[J].地质学报,2006,80(2):236-245. Zhang Baomin,Chen Jianping,Bian Lizeng,et al.Rediscussion on the sea-slooding events during Triassic to Jurassic of Kuqa Depression in Tarim Basin[J].Acta Geologia Sinica,2006,80(2):236-245.
[42] 周世新,李原,张中宁,等.库车坳陷中生代海侵事件对有机质的影响[J].沉积学报,1999,17(1):106-111. Zhou Shixin,Li Yuan,Zhang Zhongning,et al.Influence on organic matter caused by Mesozoic transgressive events in the Kuqa Depression,Tarim Basin[J].Acta Sedimentologica Sinica,1999,17(1):106-111.
[43] Parnell J.Potential of palaeofluid analysis for understanding oil charge history[J].Geofluids,2010,10(1-2):73-82.
[44] Aplin A C,Larter S R,Bigge M A,et al.PVTX history of the North Sea's Judy oilfield[J].Journal of Geochemical Exploration,2000,s69-70:641-644.
[45] Burley S D,Mullis J,and Matter A.Timing diagenesis in the Tartan reservoir(UK North Sea):constraints from combined cathodoluminescence microscopy and fluid inclusion studies[J].Marine and Petro-leum Geology,1989,6(2):98-120.
[46] 王飞宇,杜治利,李谦,等.塔里木盆地库车坳陷中生界油源岩有机成熟度和生烃历史[J].地球化学,2005,34(2):136-146. Wang Feiyu,Du Zhili,Li Qian,et al.Organic maturity and hydrocarbon generation history of the Mesozoic oil-prone source rocks in Kuqa depression,Tarim Basin[J].Geochimica,2005,34(2):136-146.