THEPROBLEM OFDRILLINGVELOCITYOFEXPLORATION INYINGQIONGBASINANDTHEMETHODFORITSSOLUTION
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摘要: 莺琼盆地具有巨大的天然气资源,除现有的几个已投产大气田外,其勘探程度还比较低。由于莺琼盆地探井较少,很难了解速度纵横向变化趋势,同时在实际工作过程中遇到速度标定存在大的误差问题,这对于钻井部署工作造成困难。主要遇到两个难题:一是采用周边已钻井的时深关系,预测深度与实钻深度存在较大误差;二是莺歌海盆地东方底辟区DF1A井VSP标定速度与区域速度存在较大的偏差。笔者针对两大速度难点展开方法研究,提出了具有针对性的方法思路,提高了探区速度预测的准确性。Abstract: TheYingqiongbasinpossessesabundantnaturalgasresources;nevertheless,exceptforafewlargegasfieldswhichhaveal-readybeenputintoproduction,theexplorationextentthereisratherlow.Asthedrillholesareinsufficientinthisbasinit'sverydiffi-culttounderstandthelongitudinalandhorizontalvariationtrendsofthevelocity.Besides,theworkofvelocitycalibrationoftenencoun-tersremarkableerrors,whichcausesdifficultyindrillholeemployment.Thereexistmainlytwodifficultproblems:oneistheexistence ofconsiderableerrorbetweenthepredicteddepthandthedrillingdepthwhenthetime-depthrelationshipofthesurroundingdrilledwell isadopted;theotheristheexistenceofratherlargedeviationbetweentheVSPcalibrationvelocityofDFIPOwellinDongfangdiapiric areaoftheYingqiongbasinandtheregionalvelocity.Aimedatsolvingthesetwodifficultproblems,theauthorsconductedmethodologi-calstudyandputforwardeffectivetrainofthoughtandmeans,thusimprovingtheaccuracyofvelocitypredictioninthestudyarea.
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Key words:
- velocityforecast /
- erroranalysis /
- Yingqiongbasin /
- Dongfangdiapiricarea /
- strippinglayermethod
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