松辽盆地长垣地区白垩系青山口组一段有机质含量对超压分析的影响及校正方法
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摘要
应用测井参数对烃源岩超压进行实证性分析时,往往会受到有机质的影响。文中将富有机质泥页岩划分为非有机质泥岩骨架、固体有机质及孔隙流体3部分,以有机质含量为基础推导出了一套针对烃源岩超压成因判别的测井参数校正方法。在以松辽盆地长垣地区葡532井青山口组一段泥页岩为例进行研究时发现,经有机质含量校正后无论是孔隙度对比法还是速度-密度交会图法皆否定了过去超压是不均衡压实所致的认识。此外,文中强调在预测埋藏深度非历史最大埋深的地质体压力时,应根据古最大埋深与现今埋深差值对正常压实趋势做相应校正。根据校正后的测井参数,对典型井进行压力预测,其精度可达95%以上。
The organic-rich shale is composed of three parts:non-organic mudstone system,solid organic matter and pore fluid.Given that the empirical analysis of source rock overpressure by logging parameters tends to be influenced by orga-nic matter,we proposed a set of logging parameter correction methods based on the content of organic matter for the identification of source rock overpressure origin.A case study of the shale in the first member of Qingshankou Formation(K_1qn_1) in Well Pu532 in Placanticline area,Songliao Basin shows that the knowledge of overpressure caused by disequilibrium compaction has been proven wrong by both porosity comparison and velocity-density cross plot under the effect of organic-matter correction.Furthermore,when measuring the pressure of a research target with its predicted buried depth less than the largest buried depth in history,it is necessary to correct the normal compaction trend by the difference between the maximum palaeoburied depth and the current one.Subsequently the prediction precision of typical wells' pressure will be better than 95% in line with corrected logging parameters.
The organic-rich shale is composed of three parts:non-organic mudstone system,solid organic matter and pore fluid.Given that the empirical analysis of source rock overpressure by logging parameters tends to be influenced by orga-nic matter,we proposed a set of logging parameter correction methods based on the content of organic matter for the identification of source rock overpressure origin.A case study of the shale in the first member of Qingshankou Formation(K_1qn_1) in Well Pu532 in Placanticline area,Songliao Basin shows that the knowledge of overpressure caused by disequilibrium compaction has been proven wrong by both porosity comparison and velocity-density cross plot under the effect of organic-matter correction.Furthermore,when measuring the pressure of a research target with its predicted buried depth less than the largest buried depth in history,it is necessary to correct the normal compaction trend by the difference between the maximum palaeoburied depth and the current one.Subsequently the prediction precision of typical wells' pressure will be better than 95% in line with corrected logging parameters.
引文
[1] Tosaya C A.Detection of abnormal pore pressures in shales by wave amplitude variations[J].Society of Exploration Geophysicists,1982,47(4):486.
[2] Bowers G L,Katsube T J.The role of shale pore structure on the sensitivity of wire-line logs to overpressure[J].AAPG Bulletin,2002,76:43-60.
[3] Hoesni J.Origins of overpressure in the Malay Basin and its influence on petroleum systems[D].Durham,United Kingdom:University of Durham,2004.
[4] O’Conner S,Swarbrick R E,Lahann R W.Geologically driven pore fluid pressure models and their implications for petroleum exploration.[J].Geofluids,2011,11(4):343-348.
[5] Tingay M R,Morley C K,Laird A,et al.Evidence for overpressure generation by kerogen-to-gas maturation in the northern Malay Basin[J].AAPG Bulletin,2013,97(4):639-672.
[6] Eaton B A.Graphical method predicts geo-pressures world wide[J].World Oil,1976,183(1):100-104.
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[10] 向才富,冯志强,吴河勇,等.松辽盆地异常压力系统及其形成原因探讨[J].地质学报,2006,80(11):1752-1759.Xiang Caifu,Feng Zhiqiang,Wu Heyong,et al.Three abnormal pressure systems developed in the Songliao Basin,northeast China and their genesis[J].Acta Ueological Sinica,2006,80(11):1752-1759.
[11] 赵靖舟,李军,徐泽阳.沉积盆地超压成因研究进展[J].石油学报,2017.Zhao Jingzhou,Li Jun,Xu Zeyang.Advances in the origin of overpressures in sedimentary basins[J].Acta Petrolei Sinica,2017.
[12] Bowers G L.Detecting high overpressure[J].The Leading Edge,2002,21(2):174-177.
[13] Tingay M R,Hillis R R.‘Vertically transferred’ overpressures in Brunei:Evidence for a new mechanism for the formation of high-magnitude overpressure[J].Geology,2007,35(11):1023-1026.
[14] Tingay M R,Hillis R R.Origin of overpressure and pore-pressure prediction in the Baram province,Brunei[J].AAPG Bulletin,2009,93(1):51-74.
[15] 霍秋立,曾花森,付丽,等.ΔlgR测井评价方法的改进及其在松辽盆地的应用[J].吉林大学学报(地球科学版),2011,41(2):586-591.Huo Qiuli,Zeng Huasen,Fu Li,et al.The advance of ΔlgR method and its application in Songliao Basin[J].Journal of Jilin Univcrsity(Earth Scicncc Edition),2011,41(2):586-591.
[16] 黄仁春,王燕,程斯洁,等.利用测井资料确定页岩储层有机碳含量的方法优选——以焦石坝页岩气田为例[J].天然气工业,2014,34(12):25-32.Huang Renchun,Wang Yan,Cheng Sijie,et al.Optimal selection of logging-based TOC calculation methods of shale reservoirs:A case study of the Jiaoshiba shale gas field,Sichuan Basin[J].Natural Gas Industry,2014,34(12):25-32.
[17] 李超,张立宽,罗晓容,等.泥岩压实研究中有机质导致声波时差异常的定量校正方法[J].中国石油大学学报(自然科学版),2016,40(3):77-87.Li Chao,Zhang Likuan,Luo Xiaorong,et al.A quantitative method for revising abnormally high sonic data in rich-organic rock during compaction study[J].Journal of China University of Petroleum(Edition of Natural Science),2016,40(3):77-87.
[2] Bowers G L,Katsube T J.The role of shale pore structure on the sensitivity of wire-line logs to overpressure[J].AAPG Bulletin,2002,76:43-60.
[3] Hoesni J.Origins of overpressure in the Malay Basin and its influence on petroleum systems[D].Durham,United Kingdom:University of Durham,2004.
[4] O’Conner S,Swarbrick R E,Lahann R W.Geologically driven pore fluid pressure models and their implications for petroleum exploration.[J].Geofluids,2011,11(4):343-348.
[5] Tingay M R,Morley C K,Laird A,et al.Evidence for overpressure generation by kerogen-to-gas maturation in the northern Malay Basin[J].AAPG Bulletin,2013,97(4):639-672.
[6] Eaton B A.Graphical method predicts geo-pressures world wide[J].World Oil,1976,183(1):100-104.
[7] Bowers G L.Determining an appropriate pore-pressure estimation strategy[C].Offshore Technology Conference,2001,1-14.
[8] Fillippone W R.On the prediction of abnormally pressured sedimentary rocks from seismic data[J].OTC 3662,1979:2667-2676.
[9] 刘震,张万选,张厚福,等.辽西凹陷北洼下第三系异常地层压力分析[J].石油学报,1993,14(1):14-23.Liu Zhen,Zhang Wanxuan,Zhang Houfu,et al.An analysis of abnormal formation pressure of Paleogene in the north sag of Liaoxi depression[J].Acta Petrolei Sinica.1993,14(1):14-23.
[10] 向才富,冯志强,吴河勇,等.松辽盆地异常压力系统及其形成原因探讨[J].地质学报,2006,80(11):1752-1759.Xiang Caifu,Feng Zhiqiang,Wu Heyong,et al.Three abnormal pressure systems developed in the Songliao Basin,northeast China and their genesis[J].Acta Ueological Sinica,2006,80(11):1752-1759.
[11] 赵靖舟,李军,徐泽阳.沉积盆地超压成因研究进展[J].石油学报,2017.Zhao Jingzhou,Li Jun,Xu Zeyang.Advances in the origin of overpressures in sedimentary basins[J].Acta Petrolei Sinica,2017.
[12] Bowers G L.Detecting high overpressure[J].The Leading Edge,2002,21(2):174-177.
[13] Tingay M R,Hillis R R.‘Vertically transferred’ overpressures in Brunei:Evidence for a new mechanism for the formation of high-magnitude overpressure[J].Geology,2007,35(11):1023-1026.
[14] Tingay M R,Hillis R R.Origin of overpressure and pore-pressure prediction in the Baram province,Brunei[J].AAPG Bulletin,2009,93(1):51-74.
[15] 霍秋立,曾花森,付丽,等.ΔlgR测井评价方法的改进及其在松辽盆地的应用[J].吉林大学学报(地球科学版),2011,41(2):586-591.Huo Qiuli,Zeng Huasen,Fu Li,et al.The advance of ΔlgR method and its application in Songliao Basin[J].Journal of Jilin Univcrsity(Earth Scicncc Edition),2011,41(2):586-591.
[16] 黄仁春,王燕,程斯洁,等.利用测井资料确定页岩储层有机碳含量的方法优选——以焦石坝页岩气田为例[J].天然气工业,2014,34(12):25-32.Huang Renchun,Wang Yan,Cheng Sijie,et al.Optimal selection of logging-based TOC calculation methods of shale reservoirs:A case study of the Jiaoshiba shale gas field,Sichuan Basin[J].Natural Gas Industry,2014,34(12):25-32.
[17] 李超,张立宽,罗晓容,等.泥岩压实研究中有机质导致声波时差异常的定量校正方法[J].中国石油大学学报(自然科学版),2016,40(3):77-87.Li Chao,Zhang Likuan,Luo Xiaorong,et al.A quantitative method for revising abnormally high sonic data in rich-organic rock during compaction study[J].Journal of China University of Petroleum(Edition of Natural Science),2016,40(3):77-87.