摘要
头屯河组是准噶尔盆地腹部陆西地区SN大型岩性油气田的主要油层组之一,由于井径垮塌严重,致使声波、密度测井曲线严重失真,制约了储层预测技术的应用。经分析认为,井径垮塌是因水基泥浆浸泡泥岩导致膨胀蚀变所致,泥岩段原状地层电阻率(RT)基本不受泥浆浸泡影响。据此,建立了井径垮塌段原状地层电阻率(RT)和声波速度,以及声波速度和密度之间新的关系式。应用新的关系式分段对声波和密度进行校正,最后采用滤波公式作平滑处理。应用该方法获得了高质量的声波测井曲线和密度测井曲线,提高了合成记录制作质量,保证了层位标定和井约束下的波阻抗反演结果的正确性,能更有效地解决由于头屯河组地层普遍扩径给岩性圈闭识别带来的困难。
Toutunhe formation is one of the main oil reservoirs formations in SN large lithologic oil and gas field in Luxi region in belly of Junggar basin.The severe collapse of well holes result in distort of acoustic logging and density logging,which restrict application reservoir prediction technique to explore lithologic oil and gas reservoirs.By analyzing,we consider that the mud rocks' bulge alteration caused by water base mud immerse induces the collapse of well holes.Virgin zone's RT at the mud rock section is affected lightly by mud immersion.We present some new correlation formulas between RT and acoustic logging,density and acoustic logging to correct acoustic and density loggings,and then to smooth the correction data using filtering formula.With the processing,the accuracy of the synthetic seismogram is improved greatly,which is important to calibrate horizons and wave impedance inversion,and resolve the recognition difficulty of lithologic trap caused by borehole enlargement.
出处
《物探化探计算技术》
CAS
CSCD
2008年第1期43-47,90-91,共5页
Computing Techniques For Geophysical and Geochemical Exploration
基金
中国石油天然气股份有限公司部级重点科技攻关项目(KTQQ-2006-012)
关键词
准噶尔盆地
岩性油气藏
地震反演
环境影响
曲线校正
地震合成记录
junggar basin
lithologic oil and gas reservoir
seismic inversion
environmental influence
log correction
synthetic seismic record
