西湖1井钻前地震压力预测
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摘要
西湖1井是准噶尔盆地南缘深部地层进一步油气勘探研究提供基础资料而部署的一口风险预探井。该井钻探构造高陡,钻遇断裂多,地层变化大,钻前地层压力预测更为重要。在地震地质解释研究的基础上,综合分析了工区内已钻的异常压力分布情况和形成机理,确定了本区地层压力的经验公式。通过对地震速度研究,建立三维速度场,进行层速度反演,提取井点地震速度。正确地估算了西湖1井的地层压力,为井身结构工程设计提供了依据,确保了钻井的顺利,地层压力预测结果与完钻后地层压力测试一致。
Xihu-1 well l is a deep and risk exploration well in the south margin of Junggar basin and it can provide a basis for further research on oil and gas exploration data in this area.The formation has high and steep structure and fracture.Before drilling,formation pressure prediction is even more important.In the study of seismic geological interpretation on the basis of comprehensive analysis of the wells drilled,the distribution and formation mechanism of abnormal pressure have been gotten,and it was determined the empirical formula of formation pressure in this area.Based on the study of seismic velocity,three dimensional velocity field has been setup,the interval velocity is inverted,and well seismic velocity is extracted.Correctly estimating of the well Xihu 1 formation pressure,casing design and ensure smooth drilling are made.The formation pressure prediction results has been consistent to the forrmation pressure testing results when drilling.
Xihu-1 well l is a deep and risk exploration well in the south margin of Junggar basin and it can provide a basis for further research on oil and gas exploration data in this area.The formation has high and steep structure and fracture.Before drilling,formation pressure prediction is even more important.In the study of seismic geological interpretation on the basis of comprehensive analysis of the wells drilled,the distribution and formation mechanism of abnormal pressure have been gotten,and it was determined the empirical formula of formation pressure in this area.Based on the study of seismic velocity,three dimensional velocity field has been setup,the interval velocity is inverted,and well seismic velocity is extracted.Correctly estimating of the well Xihu 1 formation pressure,casing design and ensure smooth drilling are made.The formation pressure prediction results has been consistent to the forrmation pressure testing results when drilling.
引文
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[2]查明,张卫海,曲江秀.准噶尔盆地异常高压特征、成因及勘探意义[J].石油勘探与开发,2000,27(2):31.
[3]PILLIPPONE W R.Estim ation of form ation param-eters and the prediction of overpressure from seismicdata[J].The SEG Re—search Symp,Geopressurestudies.1982,10:850.
[4]李军.各向异性介质多波速度分析方法及软件实现[J].物探化探计算技术,2010,32(4):359.
[5]吴晓智,王立宏,宋志理.准噶尔盆地南缘构造应力场与油气运聚的关系[J].新疆石油地质,2000,21(2):97.
[6]云美厚.地震地层压力预测[J].石油地球物理勘探,1996,31(4):575.
[7]贾义蓉.变速三维地震速度场的构建与应用[J].物探化探计算技术,2011,33(3):243.
[8]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[J].石油钻井技术,2001,29(5):211.
[9]孙祥娥.地震波速度求取若干问题研究[M].成都:成都理工大学,2007.
[10]韩庆功.利用地震层速度预测地层压力[J].石油物探技术,1988,9(3):295.
[11]贺锡雷,吴永国,贺振华.速度误差对时间偏移和深度偏移的影响分析[J].物探化探计算技术,2010,32(5):459.
[12]葛家理.现代油气藏渗流力学原理[M].北京:石油工业出版,2003.
[13]张辛耘,王敬农,郭彦军.随钻测井技术进展和发展趋势[J].测井技术,2006,30(1):10.
[14]李颚荣.地应力测量理论研究与应用[M].北京:地质出版社,1987.
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