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首页> 外文期刊>Petrophysics: The SPWLA Journal of Formation Evaluation and Reservoir Description >Porosity and Water Saturation from LWD NMR in a North Sea Chalk Formation
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Porosity and Water Saturation from LWD NMR in a North Sea Chalk Formation

机译：北海粉笔组中随钻测井核磁共振的孔隙度和水饱和度

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Nuclear Magnetic Resonance Logs While Drilling (NMR-WD) were acquired in the Eldfisk Field in the Norwegian North Sea sector as part of a project to evaluate water saturation in flooded intervals. The vertical 2/7 A-29B well shows clear resistivity log evidence of water breakthrough in the Tor formation. The spectral and vertical resolution of the NMR log T_1 distributions acquired while drilling surpass the resolution of the T2 distributions collected on the wipe pass and are on par with the best wireline T_1 distributions recorded at nearby Ekofisk Field. The T_1 distributions exhibit clear and distinct trends in different reservoir sections. The faster component in the bimodal T_1relaxation time distributions represents the water volume, and the slower component the remaining hydrocarbon. The need for hydrocarbon and invasion corrections is evident from the T_1 distributions that indicate a relatively high proportion of water-filled pores, both in the initial state and water-flooded intervals. Resistivity passes also suggest mud-filtrate invasion, resulting in high S_(xo) values. Accurate porosity readings are obtained with proper accounting for the fluid density and hydrogen index of the fluids in the flushed zone. The results from this well show that While-Drilling T} logs are viable alternatives to wireline NMR logs, enabling the accurate assessment of porosity and fluid types. The data quality that is acquired during relatively slow drilling rates produces NMR log results of sufficient character that it improves the evaluation of reservoir properties of a complex chalk reservoir.
机译：挪威北海地区Eldfisk油田获得了随钻测井核磁共振（NMR-WD），这是评估淹水期含水饱和度项目的一部分。垂直的2/7 A-29B井显示出清晰的电阻率测井曲线，证明Tor层中有水突破。随钻获得的NMR测井T_1分布的频谱和垂直分辨率超过了擦拭通道上收集的T2分布的分辨率，并且与附近Ekofisk油田记录的最佳电缆T_1分布相当。 T_1分布在不同的储层段显示出清晰明显的趋势。双峰T_1松弛时间分布中速度更快的成分代表水量，而剩余烃的速度较慢的成分代表水量。从T_1分布可以明显看出，需要进行烃和侵入校正，表明初始状态和注水间隔中充水孔隙的比例相对较高。电阻率通过还表明泥浆渗透，导致高S_（xo）值。通过适当考虑冲洗区中流体的流体密度和氢指数，可以获得准确的孔隙率读数。该井的结果表明，随钻T}测井记录是有线NMR测井记录的可行替代方案，从而能够准确评估孔隙度和流体类型。在相对较低的钻速下获得的数据质量会产生具有足够特征的NMR测井结果，从而可以改善对复杂白垩储层的储层性质的评价。

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