测井资料与应用ppt课件.ppt

测井资料与应用(3)2.5声波测井(AcousticLog)2.5.1测量原理Fullwaveform常规声波测井一般提供声波时差Δt
不同的地层具有不同的声波速度和时差Δt2.5.3声波孔隙度2.5.4应用Wyllie平均时间公式(WTA)

最常用的孔隙度公式:

Øs=

式中,△tma纯地层骨架的声波时差;
△tf孔隙流体的声波时差;
Cp压实校正系数.

压实校正压实校正图版范例砂岩Δt=110µs/ft不校正:Φ=40%选择Cp=1.5:Φ≈27%泥质影响校正油,气影响校正

油,气的t大于水---油/气层处理出的ΦAC偏大

油,气影响校正系数:

气层Φt=0.7×ΦAC
油层Φt=0.9×ΦAC
GR研究岩石的物理特性BoreholeBreakout地层出砂分析用斯通利波计算渗透率2.6电阻率测井不同地层的电阻率Presentation2.6.3DualLateralResistivityTool*8Rtcurveswithdifferentinvestigationdepth(10–120in)

*Theloggingcurvesseparateinthepermeablezone.

*Theinvasionprofileshowsustheflushedzone,transition
zoneandvirginzone.Usefocusedcurrent*Veryshallowinvestigation(2-12in)*MeasureRtofflushedzone(RXO)*Usedforevaluationofinvadedaffection2.6.6环境影响
主要的环境影响

●井眼垮塌
●电阻率差异大的围岩
●泥浆侵入.
TheaffectionofbedthicknessBedthickness
Correction
(Inductionlog)

Bedthickness
>6ft
Nocorrection

Thinnerbedsneedmorecorrection

DifferentRsneeddifferentcorrection
ChartforboreholecorrectiontoduallateralExamplegive:Rm=1ΏmRD=10Ώmborehole=11inRLLDcorr≈10×1.4≈14(Ώm)WaterzoneSaltymud(Rm<Rw,lowRtinvaded):Ra>Rxo>RmFreshwatermud(Rm>Rw,highRtinvaded):Ra<Rxo<RmOilzoneSaltymud(Rm<Rw,lowRtinvaded):Ra>Rxo>RmFreshwatermud(Rm>Rw,highRtinvaded):Ra>Rxo>RmRa–apparentlogresistivityRxo–flushedzoneresistivityRm–mudresistivityHighresistivityinvasionLowresistivityinvasion2.6.7应用Oil

water

HardrockwithhigherRtvalueThankYou!