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首页> 外文期刊>Petroleum exploration and development >Densification and hydrocarbon accumulation of Triassic Yanchang Formation Chang 8 Member, Ordos Basin, NW China: Evidence from geochemistry and fluid inclusions
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Densification and hydrocarbon accumulation of Triassic Yanchang Formation Chang 8 Member, Ordos Basin, NW China: Evidence from geochemistry and fluid inclusions

机译：中国西北鄂尔多斯盆地三叠系延长组长8致密化和油气成藏：来自地球化学和流体包裹体的证据

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Crushing, acid treatment and step wise separation and oil extraction were employed to obtain the different occurrence state hydrocarbons. All these fractions have been analyzed by Gas Chromatography-Mass Spectrometer (GC-MS). The fractions relationship and related oil charging process can be mirrored through the analysis of fractions weight content and geochemical characteristics, in combination with the research of inclusions homogenization temperature and fluorescence spectrum parameters. Experimental results reveal that there are four state hydrocarbons, i.e. free hydrocarbon, sealed hydrocarbon, hydrocarbon in carbonate cement, and hydrocarbon within inclusions caught by quartz grains and feldspar grains in the oil-rich sandstones of Chang8 Member, Triassic Yanchang Formation in the Ordos Basin. Among them, the overwhelming fraction is the free hydrocarbon, averaged 93.4%. Fluorescence spectrum parameters of γ max, QF 535 and Q 650/500 show that the crude oil maturity of the inclusions imprisoned in feldspar, quartz, and carbonate cement increase in turn, and the parameter values of the inclusions in feldspar and quartz are similar and much different from those of carbonate cement. Through analysis of C29 ββ/(αα+ββ) and C2920S/(20S+20R), together with methylphenanthrene ratio, it is revealed that thermal-evolutionary degree of the hydrocarbon within inclusions, hydrocarbon in carbonate cement, sealed hydrocarbon, free hydrocarbon reflects an upward trend, and the data of the last two type are similar. Integrated study of diagenetic sequence and thermal evolutionary degree suggest that the Chang 8 sandstones had been compacted before reservoir formation and the reservoirs have experienced three phase of charge events in which the third one played the most important role for reservoir formation.
机译：采用粉碎，酸处理，分步分离和采油的方法，得到了不同的赋存状态烃。所有这些级分均已通过气相色谱-质谱仪（GC-MS）进行了分析。通过分析馏分的重量含量和地球化学特征，结合对包裹体均质温度和荧光光谱参数的研究，可以反映出馏分的关系和相关的充油过程。实验结果表明，鄂尔多斯盆地三叠系延长组长8段富油砂岩中有游离烃，封闭烃，碳酸盐胶结烃，夹杂物被石英粒和长石夹杂物内的烃四种状态烃。 。其中，绝大多数是游离烃，平均占93.4％。 γmax，QF 535和Q 650/500的荧光光谱参数表明，囚禁在长石，石英和碳酸盐水泥中的夹杂物的原油成熟度依次增加，并且长石和石英中的夹杂物的参数值相似，且与碳酸盐水泥大不相同。通过分析C29ββ/（αα+ββ）和C2920S /（20S + 20R）以及甲基菲比，发现夹杂物中碳氢化合物的热演化程度，碳酸盐水泥中的碳氢化合物，封闭碳氢化合物，游离碳氢化合物的反映上升趋势，最后两种类型的数据相似。对成岩层序和热演化程度的综合研究表明，长8砂岩在储层形成之前已被压实，储层经历了三个阶段的电荷事件，其中第三个阶段对储层的形成起着最重要的作用。

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