四川盆地焦石坝地区龙马溪组页岩层序及页岩气“甜点”地震预测
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摘要
我国页岩气勘探开发在四川盆地焦石坝地区龙马溪组已经取得重大突破,针对性的页岩气"甜点"地球物理技术亟待研究和探索。沉积相是进行页岩气甜点预测和描述的重要基础和依据。应用层序地层学理论,建立了页岩层段的三级层序地层格架,认清了深水陆棚页岩沉积相的展布规律,目的层五峰组及龙马溪组富碳高硅和高碳高硅泥页岩主要分布在三级层序的海侵体系域。在此基础上,探索了层序地层格架控制下的页岩气"甜点"的地球物理识别和预测方法。研究认为,页岩气地球物理识别与预测技术在含气页岩有机碳含量(TOC)、裂缝和脆性等方面具有较大的优势,能为页岩气水平井分段压裂工程和水平井轨迹设计提供有力的技术支持。
A breakthrough in shale-gas exploration and development has been reached over the past few years in the Longmaxi Formation of the Sichuan Basin in China.Specific geophysical methods and techniques are thoroughly studied and applied for detecting sweet spots.Sequence stratigraphic study suggests that the shale segment belongs to a deep-water shelf deposits.High quality shale mainly occurs in the transgressive systems tracts(TST)of a sequence.Facies analysis is then made,as a most important mean for sequence stratiigraphic study and prediction of sweet spots.Geophysics is the most efficient tool for identification and prediction of sweet spots under the framework of sequence stratigraphy.In addition,it has advantages in determination of organic carbon content(TOC),cracks,brittleness and stress field,etc.and may provide powerful technical support to the fracturing during the stage of horizontal well drilling.
A breakthrough in shale-gas exploration and development has been reached over the past few years in the Longmaxi Formation of the Sichuan Basin in China.Specific geophysical methods and techniques are thoroughly studied and applied for detecting sweet spots.Sequence stratigraphic study suggests that the shale segment belongs to a deep-water shelf deposits.High quality shale mainly occurs in the transgressive systems tracts(TST)of a sequence.Facies analysis is then made,as a most important mean for sequence stratiigraphic study and prediction of sweet spots.Geophysics is the most efficient tool for identification and prediction of sweet spots under the framework of sequence stratigraphy.In addition,it has advantages in determination of organic carbon content(TOC),cracks,brittleness and stress field,etc.and may provide powerful technical support to the fracturing during the stage of horizontal well drilling.
引文
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[15]刘勇,方伍宝,李振春,等.基于叠前地震的脆性预测方法及应用研究[J].石油物探,2016,55(3):425-432.
[16]徐天吉,陈冰洁,胡冰,等.基于VTI介质弹性参数的页岩脆性预测方法及其应用[J].石油与天然气地质,2016,37(6):971-978.
[2]龚建明,李刚,李桂海,等.页岩气成藏的关键因素[J].海洋地质前沿,2012,28(10):28-32.
[3]陈亚琳.涪陵页岩气田焦石坝地区含气量定量预测技术[J].海洋地质前沿,2017,33(1):53-61.
[4]彭嫦姿,彭俊,陈燕辉,等.四川盆地元坝地区大安寨段页岩气“甜点”地震预测[J].天然气工业,2014,34(6):42-47.
[5]Hammes U,Frebourg G.海因斯维尔和博希尔泥岩:美国东德克萨斯州和路易斯安那州岩相及层序地层研究[J].石油地质科技动态,2014,3:1-27.
[6]李一凡,樊太亮,高志前,等.渝东南地区志留系黑色页岩层序地层研究[J].天然气地球科学,2012,23(2):299-305.
[7]王香文,刘红,藤彬彬,等.地质统计学反演技术在薄储层预测中的应用[J].石油与天然气地质,2012,33(5):730-735.
[8]许杰,何治亮,董宁,等.含气页岩有机碳含量地球物理预测[J].石油地球物理勘探,2013,48(增刊1):64-68.
[9]张营革.泥页岩油气藏有机碳含量地球物理预测方法[J].油气地质与采收率,2013,20(5):64-67.
[10]Goodway B,Perez M,Varsek J,et al.Seismic petrophysics and isotropic-anisotropic AVO methods for unconventional gas exploration[J].The Leading Edge,2010,29(12):1500-1508.
[11]Dorn G,James h.Automatic fault extraction of faults and a salt body in a 3-D survey from the Eugene Island area,Gulf of Mexico[C].AAPG International Conference and Exhibition,Expanded Abstracts,2005.
[12]宗兆云,印兴耀,张繁昌.基于弹性阻抗贝叶斯反演的拉梅参数提取方法研究[J].石油地球物理勘探,2011,46(4):598-604
[13]蒋春玲,敬兵,张喜梅,等.利用叠前弹性参数反演储层参数[J].石油地球物理勘探,2011,46(3):452-456
[14]董宁,许杰,孙赞东,等.泥页岩脆性地球物理预测技术[J].石油地球物理勘探,2013,48(增刊):69-74.
[15]刘勇,方伍宝,李振春,等.基于叠前地震的脆性预测方法及应用研究[J].石油物探,2016,55(3):425-432.
[16]徐天吉,陈冰洁,胡冰,等.基于VTI介质弹性参数的页岩脆性预测方法及其应用[J].石油与天然气地质,2016,37(6):971-978.