Nuclear Magnetic Resonance Evaluation Method of Shale Oil with Medium and Low Maturity in Biyang Sag
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摘要:
中低成熟度页岩油孔隙结构复杂，孔隙致密，探测难度大，干酪根、沥青、类固体等组分发育，甜点准确评价困难。为准确评价中低成熟度页岩储层的储集特性和含油特性，以低场核磁共振技术为主要研究手段，对比分析了磁场强度、探头口径、回波间隔和波峰偏移等影响核磁共振信号采集精度的因素，确定了适用于短弛豫组分发育的中低成熟度页岩油高精度采集参数。采用高分辨率一维、二维核磁共振测量，结合氮气吸附、压汞、地化分析等实验结果，评价了泌阳凹陷YY1井的储集性、含油性，建立了基于二维核磁谱图组分的干酪根含量表征模型。研究结果表明，中低成熟度页岩油的核磁共振测量对仪器的回波间隔要求更高，在仪器硬件无法缩短TE条件下，可以通过波峰偏移方式采集更多的短弛豫组分信息，以获得更具备代表性的图谱。核磁共振技术能够实现中低成熟度页岩油储层和烃源岩多种特性的高精度评价，开展深入信息挖掘和研究对中低成熟度页岩油高效勘探开发具有重要作用。
Abstract:The pore structure of shale oil with medium and low maturity is complex, and the detection of pore density is difficult. In addition, kerogen, asphalt, and solid-like components are developed, making it difficult to accurately evaluate sweet spots. In order to accurately evaluate the reservoir and oil-bearing characteristics of shale reservoirs with medium and low maturity, low-field nuclear magnetic resonance (NMR) technology was taken as the main research method. The factors affecting the acquisition accuracy of NMR signals, such as magnetic field intensity, probe aperture, echo interval, and peak shift, were compared and analyzed, and the high-precision acquisition parameters of shale oil with medium and low maturity suitable for the development of short relaxation components were determined. The reservoir and oil-bearing characteristics of Well YY1 in Biyang Sag were evaluated by using high-resolution 1D and 2D NMR measurements, combined with the experimental results of nitrogen adsorption, mercury injection, and geochemical analysis, and a characterization model of kerogen content based on 2D NMR components was established. The results show that the NMR measurement of shale oil with medium and low maturity puts forward higher requirements for the echo interval of instruments. Under the condition that TE cannot be shortened by instrument hardware, more information of short relaxation components can be collected by means of peak shift to obtain more representative spectra. NMR technology can realize the high-precision evaluation of various characteristics of shale oil reservoirs and source rocks with medium and low maturity. It is of great role to carry out in-depth information mining and research for the efficient exploration and development of shale oil with medium and low maturity.
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Keywords:
- medium and low maturity /
- shale oil /
- NMR /
- acquisition parameter /
- reservoir evaluation
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图 1 同一块页岩岩样的不同磁场强度核磁共振T2谱
Figure 1. T2 NMR spectra of the same shale with different field strengths
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图 2 同一块页岩岩样的不同磁场强度核磁共振T1-T2谱
Figure 2. T1-T2 NMR spectra of the same shale with different field strengths
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图 4 同一岩样不同回波间隔条件下核磁共振T2谱
Figure 4. T2 NMR spectra of the same core under different echo intervals
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图 5 同一岩样不同回波间隔条件下核磁共振T1-T2谱
Figure 5. T1-T2 NMR spectra of the same core under different echo intervals
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图 7 不同波峰偏移参数条件下的核磁共振T1-T2谱
Figure 7. T1-T2 NMR spectra under different peak shift parameters
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图 9 核磁共振与氮气吸附-压汞对比
Figure 9. Comparison of NMR and nitrogen adsorption with mercury injection measurement results
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图 10 页岩多组分二维T1-T2核磁共振识别图版
Figure 10. 2D T1-T2 NMR identification plate for shale multi-components
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图 11 孔隙结构与含油性的关系
Figure 11. Relationship between pore structure and oil-bearing characteristic
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图 12 核磁共振T1-T2谱中P1区域信号强度与干酪根裂解烃含量S2-2的相关性
Figure 12. Correlation between P1 region signal quantity in T1-T2 NMR spectra and kerogen cracking hydrocarbon content S2-2
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