2．3 測前設(shè)計(jì)的重要性測前設(shè)計(jì)是進(jìn)行一次成功的NMR測井的重要部分。測前設(shè)計(jì)包括服務(wù)公司和用戶之間的緊密聯(lián)系。服務(wù)公司已開發(fā)了施工設(shè)計(jì)軟件，包括儀器配置，軟件可以根據(jù)用戶的目標(biāo)來選擇最優(yōu)的NMR信號采集模式、測量參數(shù)和測井速度。電纜式NMR測井儀的測速取決于所采用的測井模式。決定測速最重要的因素之一是需要多長的極化時(shí)問，這取決于T 的大小。含氣和低黏度油的地層(值為幾秒)需要很長的極化時(shí)間，結(jié)果會使測速降低(一般測速是76～274 m／h)。在許多地層(如油的黏度大于10 mPa·S的泥質(zhì)砂層)，測速可達(dá)
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