LD10区高温高压气藏电阻拟合声波曲线方法研究
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摘要
莺歌海盆地经过多年的投入已经从浅层常温常压勘探逐渐向中深层高温高压勘探发展.2015年在莺歌海盆地LD10区中深层钻探W1、W2两口井证实目的层为优质含气砂岩.但是受高温高压影响,严重制约了钻井工程中的测试需求,两口井在目的层段均未测到声波时差测井曲线.这就导致无法通过井震标定来准确的获取时深关系,高温高压情况下目的层含气砂体对应的地震响应是波峰还是波谷存在争议.宏观上对LD10区速度展布规律研究发现,LD10区的电阻率、地层速度及压力均与泥岩欠压实有关系,以此为依据建立了电阻率曲线拟合声波曲线的技术路线.分别利用电阻率曲线拟合W1、W2井目的层段的声波时差曲线进行井震标定,结果显示曲线的拼接段合理且井震匹配程度高.证实受高温高压影响,气层顶面为波峰地震响应,与传统含气砂体低速低密表现为波谷的特征完全不同.成果为LD10区进一步的钻井提供指导,后续的实钻井也不断证实应用电阻率曲线拟合声波曲线方法合理可靠.
After years of investment,the Yinggehai basin has been gradually developed from the shallow exploration under normal temperature and pressure into deep exploration under high temperature and high pressure.In 2015,two wells named W1\W2 were drilled in LD10 target area of the Yinggehai Basin deep, proved that the target layer is high quality gas bearing sandstone. However,with the influence of high temperature and high pressure influence, the test requirements of drilling engineering are seriously restricted, and the sonic logging curves are not detected in the target beds in two wells. Therefore, it is impossible for us to obtain the time-depth relationship accurately by well-seismic calibration, and now we are in dispute about whether the seismic response of the gas reservoir in the target layer under high temperature and high pressure is the peak or the trough. Macroscopically, the velocity distribution law of LD10 area discovered that the resistivity,velocity and pressure of the LD10 zone are related to the mudstone undercompaction. On this basis we established the technical route of resistivity fitting sonic curve. We use the resistivity curves of W1 and W2 to obtain the sonic curve of the target layer, and then the well-seismic calibration is completed by using this sonic curve. Well seismic calibration results show that the matching degree of well seismic is high. It is proved with the influence of high temperature and high pressure that the seismic response of top of gas reservoir is peak.Compared with traditional gas reservoir with low velocity and low density, the seismic response of the top surface is trough. The results of this study provide guidance for further drilling in LD10 area, and the subsequent drilling proved that the method of resistivity curve fitting sonic curve is reasonable and reliable.
After years of investment,the Yinggehai basin has been gradually developed from the shallow exploration under normal temperature and pressure into deep exploration under high temperature and high pressure.In 2015,two wells named W1\W2 were drilled in LD10 target area of the Yinggehai Basin deep, proved that the target layer is high quality gas bearing sandstone. However,with the influence of high temperature and high pressure influence, the test requirements of drilling engineering are seriously restricted, and the sonic logging curves are not detected in the target beds in two wells. Therefore, it is impossible for us to obtain the time-depth relationship accurately by well-seismic calibration, and now we are in dispute about whether the seismic response of the gas reservoir in the target layer under high temperature and high pressure is the peak or the trough. Macroscopically, the velocity distribution law of LD10 area discovered that the resistivity,velocity and pressure of the LD10 zone are related to the mudstone undercompaction. On this basis we established the technical route of resistivity fitting sonic curve. We use the resistivity curves of W1 and W2 to obtain the sonic curve of the target layer, and then the well-seismic calibration is completed by using this sonic curve. Well seismic calibration results show that the matching degree of well seismic is high. It is proved with the influence of high temperature and high pressure that the seismic response of top of gas reservoir is peak.Compared with traditional gas reservoir with low velocity and low density, the seismic response of the top surface is trough. The results of this study provide guidance for further drilling in LD10 area, and the subsequent drilling proved that the method of resistivity curve fitting sonic curve is reasonable and reliable.
引文
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Liu Z J,Lu Z Q,Zhang W,et al. 2015. Assessment of accumulation conditions for medium-deep oil in ledong area of the central diaper belt,yinggehai basin[J]. Marine Geology & Quaternary Geology(in Chinese),35(4): 49.刘志杰,卢振权,张伟,等. 2015. 莺歌海盆地中央泥底辟带东方区与乐东区中深层成藏地质条件[J]. 海洋地质与第四纪地质,35(4): 49- 61.
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Yuan X Y,Zhang S N,Meng X H,et al.2013. Gardner formula with an additional correction term[J]. Oil Geophysical Prospecting(in Chinese),48(2): 279-280.袁晓宇,张哨楠,孟祥豪,等. 2013.一种添加修正项的Gardner公式[J]. 石油地球物理勘探,48(2): 279-282.
Zhang J X,Dang Y Y,He X H,et al. 2015. Origin and sedimentary characteristics of canyon channels in ledong area of yinggehai basin[J]. Marine Geology & Quaternary Geology(in Chinese). 35(5): 29-34.张建新,党亚云,何小胡,等. 2015. 莺歌海盆地乐东区峡谷水道成因及沉积特征[J]. 海洋地质与第四纪地质,35(5): 29-36.
Zhao X M,Li G P,Wang S Y,et al. 2002. Logging identification of uncompacted and superpressure belts[J] OIL & GAS GEOLOGY (in Chinese),23(1): 63- 64.赵新民,李国平,王树寅,等. 2002. 欠压实带与超压带的测井识别[J]. 石油与天然气地质,23(1): 63- 65.
Zhu F B. 2000. Characteristics of geopressure in yinggehai basin and its significance in petroleum geology[J]. China Offshore Oil and Gas (Geology) (in Chinese),14(4): 249.朱芳冰. 2000. 莺歌海盆地地层压力特征及其石油地质意义[J]. 中国海上油气(地质),14(4): 248-252.
Hermanrud,et al. 1998. Shale Porosities from well logs on Haltenbanken (offshore Mid-Norway) show no influence of overpressuring[J]. AAPG Memoir,70: 65-87.
Li G F,Liao Q J,Wang S X,et al. 2008. Discussions about horizon calibration based on well-log synthetic seismogram[J]. Geophysical Prospecting for Petroleum(in Chinese),47(2): 145-149.李国发,廖前进,王尚旭,等. 2008. 合成地震记录层位标定若干问题的探讨[J]. 石油物探,47(2): 145-149.
Liu Z J,Lu Z Q,Zhang W,et al. 2015. Assessment of accumulation conditions for medium-deep oil in ledong area of the central diaper belt,yinggehai basin[J]. Marine Geology & Quaternary Geology(in Chinese),35(4): 49.刘志杰,卢振权,张伟,等. 2015. 莺歌海盆地中央泥底辟带东方区与乐东区中深层成藏地质条件[J]. 海洋地质与第四纪地质,35(4): 49- 61.
Ma Z G,Xie J G. 2005. Relationship among compressional wave ,shear wave velocities and density of rocks[J]. Progress in Geophysics(in Chinese),20(4): 906.马中高,解吉高. 2005. 岩石的纵、横波速度与密度的规律研究[J]. 地球物理学进展,20(4): 906-910,doi: 10.3969/j.issn.1004-2903.2005.04.004.
Yang Z,He S,Wu H Z,et al. 2006. Geophysical response relationship study on characteristics and mechanisms of overpressure in southern junggar basin[J]. West China Petroleum Geosciences(in Chinese),2(3): 286-288.杨智,何生,武恒志,等. 2006. 准噶尔盆地南缘超压地球物理特征与成因响应关系研究[J]. 中国西部油气地质,2(3): 286-288+293.
Yuan X Y,Zhang S N,Meng X H,et al.2013. Gardner formula with an additional correction term[J]. Oil Geophysical Prospecting(in Chinese),48(2): 279-280.袁晓宇,张哨楠,孟祥豪,等. 2013.一种添加修正项的Gardner公式[J]. 石油地球物理勘探,48(2): 279-282.
Zhang J X,Dang Y Y,He X H,et al. 2015. Origin and sedimentary characteristics of canyon channels in ledong area of yinggehai basin[J]. Marine Geology & Quaternary Geology(in Chinese). 35(5): 29-34.张建新,党亚云,何小胡,等. 2015. 莺歌海盆地乐东区峡谷水道成因及沉积特征[J]. 海洋地质与第四纪地质,35(5): 29-36.
Zhao X M,Li G P,Wang S Y,et al. 2002. Logging identification of uncompacted and superpressure belts[J] OIL & GAS GEOLOGY (in Chinese),23(1): 63- 64.赵新民,李国平,王树寅,等. 2002. 欠压实带与超压带的测井识别[J]. 石油与天然气地质,23(1): 63- 65.
Zhu F B. 2000. Characteristics of geopressure in yinggehai basin and its significance in petroleum geology[J]. China Offshore Oil and Gas (Geology) (in Chinese),14(4): 249.朱芳冰. 2000. 莺歌海盆地地层压力特征及其石油地质意义[J]. 中国海上油气(地质),14(4): 248-252.