基于叠前反演的泥页岩地层压力预测方法
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摘要
为了解决泥页岩地层压力预测问题,以焦石坝地区志留系龙马溪组页岩气储层为研究对象,调研分析了现今常用地层压力预测方法的适用性。在对页岩气储层异常压力发育段进行测井响应特征分析的基础上,提出能够有效识别页岩气异常地层压力的新参数,即异常地层压力识别因子;最后利用叠前弹性波阻抗反演结果计算出异常地层压力识别因子,从而预测焦石坝地区泥页岩地层的压力分布特征。与传统预测方法相比,基于叠前弹性波阻抗反演的泥页岩地层压力预测新方法具有更高的精度。该研究成果可以应用于泥页岩地层的压力预测,为页岩气精细勘探提供了依据。
With the deep exploration and development of shale gas,formation pressure prediction has become an urgent problem to be solved. Taking shale gas reservoir of Silurian Longmaxi Formation in Jiaoshiba area as the research object,the applicability of traditional formation pressure prediction methods was analyzed. Based on the analysis of logging response characteristics of abnormal pressure development zone of shale gas reservoir,a new parameter,namely abnormal formation pressure factor,was proposed to effectively identify abnormal formation pressure of shale gas. The pre-stack elastic impedance inversion result was used to calculate the abnormal formation pressure factor,so as to predict the pressure distribution characteristics of shale formation in Jiaoshiba area.The prediction result of the new method shows higher accuracy than that of the traditional method. This research results can be applied to pressure prediction of shale formation and provide a theoretical reference for fine explo-ration of shale gas.
With the deep exploration and development of shale gas,formation pressure prediction has become an urgent problem to be solved. Taking shale gas reservoir of Silurian Longmaxi Formation in Jiaoshiba area as the research object,the applicability of traditional formation pressure prediction methods was analyzed. Based on the analysis of logging response characteristics of abnormal pressure development zone of shale gas reservoir,a new parameter,namely abnormal formation pressure factor,was proposed to effectively identify abnormal formation pressure of shale gas. The pre-stack elastic impedance inversion result was used to calculate the abnormal formation pressure factor,so as to predict the pressure distribution characteristics of shale formation in Jiaoshiba area.The prediction result of the new method shows higher accuracy than that of the traditional method. This research results can be applied to pressure prediction of shale formation and provide a theoretical reference for fine explo-ration of shale gas.
引文
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[2]姜福杰,庞雄奇,欧阳学成,等.世界页岩气研究概况及中国页岩气资源潜力分析.地学前缘,2012,19(2):198-211.JIANG F J,PANG X Q,OUYANG X C,et al.The main progress and problems of shale gas study and the potential prediction of shale gas exploration.Earth Science Frontiers,2012,19(2):198-211.
[3]邹才能,杨智,张国生,等.常规-非常规油气“有序聚集”理论认识及实践意义.石油勘探与开发,2014,41(1):14-27.ZOU C N,YANG Z,ZHANG G S,et al.Conventional and unconventional petroleum“orderly accumulation”:Concept and practical significance.Petroleum Exploration and Development,2014,41(1):14-27.
[4]周文,徐浩,余谦,等.四川盆地及其周缘五峰组-龙马溪组与筇竹寺组页岩含气性差异及成因.岩性油气藏,2016,28(5):18-25.ZHOU W,XU H,YU Q,et al.Shale gas-bearing property differences and their genesis between Wufeng-Longmaxi Formation and Qiongzhusi Formation in Sichuan Basin and surrounding areas.Lithologic Reservoirs,2016,28(5):18-25.
[5]李可,王兴志,张馨艺,等.四川盆地东部下志留统龙马溪组页岩储层特征及影响因素.岩性油气藏,2016,28(5):52-58.LI K,WANG X Z,ZHANG X Y,et al.Shale reservoir characteristics and influencing factors of the Lower Silurian Longmaxi Formation in the eastern Sichuan Basin.Lithologic Reservoirs,2016,28(5):52-58.
[6]朱逸青,王兴志,冯明友,等.川东地区下古生界五峰组-龙马溪组页岩岩相划分及其与储层关系.岩性油气藏,2016,28(5):59-66.ZHU Y Q,WANG X Z,FENG M Y,et al.Lithofacies classification and its relationship with reservoir of the Lower Paleozoic Wufeng-Longmaxi Formation in the eastern Sichuan Basin.Lithologic Reservoirs,2016,28(5):59-66.
[7]郭旭升.南方海相页岩气“二元富集”规律:四川盆地及周缘龙马溪组页岩气勘探实践认识.地质学报,2014,88(7):1209-1218.GUO X S.Rules of two-factor enrichment for marine shale gas in sounthern China:Understanding from the Longmaxi Formation shale gas in Sichuan Basin and its surrounding area.Acta Geologica Sinica,2014,88(7):1209-1218.
[8]王志刚.涪陵页岩气勘探开发重大突破与启示.石油与天然气地质,2015,36(1):1-6.WANG Z G.Breakthrough of Fuling shale gas exploration and development and its inspiration.Oil&Gas Geology,2015,36(1):1-6.
[9]郭彤楼,张汉荣.四川盆地礁石坝页岩气田形成与富集高产模式.石油勘探与开发,2014,41(1):28-36.GUO T L,ZHANG H R.Formation and enrichment mode of Jiaoshiba shale gas field,Sichuan Basin.Petroleum Exploration and Development,2014,41(1):28-36.
[10]车世琦.测井资料用于页岩岩相划分及识别:以涪陵气田五峰组-龙马溪组为例.岩性油气藏,2018,30(1):121-132.CHE S Q.Shale lithofacies identification and classification by using logging data:a case of Wufeng-Longmaxi Formation in Fuling Gas Field,Sichuan Basin.Lithologic Reservoirs,2018,30(1):121-132.
[11]孙冬胜,金之钧,吕修祥,等.沉积盆地超压体系划分及其与油气运聚关系.石油与天然气地质,2004,25(1):14-20.SUN D S,JIN Z J,LYU X X,et al.Classification of overpressure systems in sedimentary basins and the relationship with hydrocarbon migration and accumulation.Oil and Gas Geology,2004,25(1):14-20.
[12]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.地球科学--中国地质大学学报,2009,34(3):457-470.HE S,HE Z L,YANG Z,et al.Characteristics,well-log responses and mechanisms of overpressures within the Jurassic formation in the central part of Junggar Basin.Earth ScienceJournal of China University of Geosciences,2009,34(3):457-470.
[13]李新宁,梁浩,黄卫东,等.异常地层压力地震预测方法及应用研究.石油天然气学报,2007,29(3):387-390.LI X N,LIANG H,HUANG W D,et al.Methods for predicting abnormal formation pressure and their applications.Journal of Oil and Gas Technology,2007,29(3):387-390.
[14]HOTTMAN C E,JOHNSON R K.Estimation of formation pressures from log-derived shale properties.Journal of Petroleum Technology,1965,17:717-722.
[15]MAGARA K.Compaction and fluid migration:Practical petroleum geology(Developments in petroleum science 9).New York:Elsevier Scientific Publishing Company,1978:119-127.
[16]MAGARA K.Compaction and migration of fluids in Miocene mudstone,Nagakka Plain,Japan.AAPG Bulletin,1968,52(12):2466-2501.
[17]李传亮.等效深度法并不等效.岩性油气藏,2009,21(4):120-123.LI C L.Equivalent depth method is not equivalent.Lithologic Reservoirs,2009,21(4):120-123.
[18]EATON B A.The equation for geopressure prediction from well logs.SPE 5544,1974.
[19]BOWERS G L.Pore-pressure estimation from velocity data:Accounting for overpressure mechanisms besides undercompaction.SPE Drilling and Completion,1995,10(2):89-95.
[20]FILLIPPONE W R.On the prediction of abnormally pressured sedimentary rocks from seismic data.OTC 3662,1979:2667-2676.
[21]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.石油学报,1993,14(1):14-24.LIU Z,ZHANG W X,ZHANG H F,et al.Analysis of abnormal formation pressure of Paleogene.Acta Petrolei Sinica,1993,14(1):14-24.
[22]徐世林,吕修祥,皮学军,等.新疆库车坳陷克拉苏构造带异常高压及其成藏效应.现代地质,2002,16(3):282-287.XU S L,LYU X X,PI X J,et al.Abnormally high pressure and its effect on reservoir formation of Kelasu tectonic zone in Kuqa Depression in Xinjiang.Geoscience,2002,16(3):282-287.
[23]云美厚.地震地层压力预测.石油地球物理勘探,1996,31(4):575-586.YUN M H.Formation pressure prediction using seismic data.Oil Geophysical Prospecting,1996,31(4):575-586.
[24]樊洪海.利用声速检测欠压实泥岩异常高压的简易方法与应用.石油钻探技术,2001,29(5):9-11.FAN H H.A simple pore pressure estimation method for a disequilibrium compaction shale using sonic velocity.Petroleum Drilling Techniques,2001,29(5):9-11.
[25]马海.Fillippone地层压力预测方法的改进及应用.石油钻探技术,2012,40(6):56-61.MA H.Pore pressure prediction with seismic interval velocity by the modified Fillippone method.Petroleum Drilling Techniques,2012,40(6):56-61.
[26]王斌,雍学善,潘建国,等.纵横波速度联合预测地层压力的方法及应用.天然气地球科学,2015,26(2):367-370.WANG B,YONG X S,PAN J G,et al.Methods and application of the formation pressure forecast combining vpand vs.Natural Gas Geoscience,2015,26(2):367-370.
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