Application of Logging Data Wavelet Transform and Pseudo-Imaging to Fine Division of Deep Barrier/Interlayer

doi:10.7657/XJPG20240514

Abstract

Abstract:

Barrier/interlayer is a key factor that significantly affects fluid flow and controls the distribution of oil and water, and it serves as a crucial evidence for understanding the distribution of remaining oil. Barrier/interlayer in deep strata is difficult to identify due to the high coring cost, large depth error in logging data, low resolution of conventional logging curves, and ambiguous signals from thin interbeds. Through core analysis of key wells, the logging curves sensitive to barrier/interlayer and their response characteristics were identified. By employing wavelet decomposition and reconstruction, the conventional sensitive logging curves were processed with high resolution, which reduced the smoothing effect of adjacent layers and highlighted the logging response characteristics of thin layer interfaces, making thin layer identification resolution enhanced by nearly 100%. By integrating the vector pattern of formation dip and pseudo-imaging characteristics of barrier/interlayer, a method for identifying and dividing deep barrier/interlayer was established. Actual applications demonstrate that this method allows for precise identification of barrier/interlayer, with a much higher capability than conventional methods. This method yields an accuracy of layer correlation between wells increased by 38%, elucidating the issue of inclined oil-water contact and providing remaining oil distribution.

Key words: logging data, deep barrier/interlayer, wavelet transform, formation dip, pseudo-imaging, oil-water contact

CLC Number:

TE19

SHAO Cairui, WANG Meng, CHANG Lunjie, WANG Kaiyu, ZHANG Fuming, WANG Chao. Application of Logging Data Wavelet Transform and Pseudo-Imaging to Fine Division of Deep Barrier/Interlayer[J]. Xinjiang Petroleum Geology, 2024, 45(5): 611-621.

Figures/Tables 9

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隔夹层类型	自然伽马/ API	密度/ （g·cm^-3）	深电阻率/ （Ω·m）	常规与地层倾角	伪成像
钙质	<36	>2.45	>0.9	高电阻率，高密度，低自然伽马，倾角电极曲线高阻尖峰，倾角矢量变化大、模式不稳定	白—黄白亮色条带
钙泥质	<36	<2.45	>0.8	电极曲线高阻，绿模式
泥质	>36	2.42~2.50	>0.7	高自然伽马，电阻率偏大，电极曲线小幅度低导高阻，绿模式	黄—褐暗色条带