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从烃源岩中提取的<2μm有机粘土复合体,进行升温-XRD,DTA以及热解-色谱检测,研究蒙皂石结合有机质后层间水的变化特征.在250~550℃区间,XRD曲线上有机粘土复合体中蒙皂石的d001衍射峰由250℃推迟至550℃时才移至1.00 nm处,并伴有DTA曲线上放热峰以及热解-色谱检测中大量的C20~C30的碳数有机质的释放,这与蒙皂石矿物特征不同,表明有机粘土复合体中的蒙皂石层间存在有机质.通过DTA与热解-色谱检测,发现有机粘土复合体与蒙皂石等矿物在100和600℃时的失水特征完全一致;但有机粘土复合体在550℃新增了一个失水峰,并在XRD曲线上有机粘土复合体中蒙皂石d001衍射峰依然存在,表明550℃失水峰仍属蒙皂石的层间水而非结构水.对比有机粘土复合体与蒙皂石等矿物的失水顺序和失水量,可以发现蒙皂石部分层间水是连接有机质与蒙皂石结合的‘水桥’,这造成蒙皂石结合有机质后致使部分层间水滞后排出,会为油气运移和成藏提供良好的运载介质.
The <2μm organoclay complex extracted from source rocks was tested by temperature-XRD, DTA and pyrolysis-chromatography to study the water characteristics of interlamellar water with smectite-bound organic matter.Under the temperature range of 250 ~ 550 ℃, the XRD curve The d001 diffraction peak of smectite in the organoclay complex was shifted to 1.00 nm at 250 ℃ and accompanied by the exothermic peak on DTA curve and the large amount of C20 ~ C30 in pyrolysis-chromatography The release of carbon organic matter, which is different from that of smectite mineral, indicates that organic matter exists between the smectite layers in the organoclay complex.DTA and Pyrolysis Chromatography showed that the organic clay complex and smectite minerals At 100 and 600 ℃, the water loss characteristics are identical. However, a new loss-of-water peak at 550 ℃ was added to the organoclay composite and the diffraction peak of the smectite d001 in the organoclay composite remained on the XRD curve, indicating that 550 ℃ water loss peak is still smectite interlayer water rather than structural water.Comparing organics such as organic clay and smectite mineral dehydration sequence and the amount of water loss can be found in the smectite part of the interlayer water is connected with organic matter and Montmorillonite combined with ’water bridge’, which resulted in the combination of smectite After draining water quality resulting hysteresis part of the interlayer, provides a good medium for the delivery of hydrocarbon migration and accumulation.