Diagenesis and Hydrocarbon Accumulation in Zhu Ⅲ Depression, Pearl River Mouth Basin
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摘要: 采用岩石学、矿物学、X 射线衍射分析技术、有机包裹体以及地球化学等方法对珠三坳陷成岩作用与油气聚集规律进行研究,认为珠三坳陷的成岩作用阶段处于早成岩期和晚成岩期A、B亚期,坳陷内两个主力成油(气)凹陷具有不同的成岩史,其次生孔隙发育带的形成机理也不同,油气的分布与伊蒙泥层粘土矿物转化带关系密切。珠海组砂岩石英次生加大边的形成对坳陷内油气聚集起控制作用。Abstract: The diagenesis and hydrocarbon accumulation w as studied by ways of petrology.mineralogy, X-ray diffraction analysis, organic inclusion and geochemistry in Zhu ⅢDepression, Pearl River Mouth Basin.It is suggested that the diagenetic stages are the early diagenesis and subphase A, B of late diagenesis.There aer different diagenetic history and genetic mechanism of secondary po re development zone in two major source sags of the depression.The hy drocarbon distribution is correlated w ith the illite/ smectite mixed layer clay min- eral conversion zone.The hydrocarbon accumulation of w enchang A Sag is in the fi rst and second clay mineral conversion zone, and over the first clay mineral conversion zone in Wenchang B Sag.The organic inclusions w ere formed in the diagenetic process.which contained rich information suchas the generation, evolution and mig ration of oil/ gas as well as reservoi r and so on.By studying the organic inclusions in Zhu Ⅲ Depression, it w as learned about the ty pe, distribution, homogenization temperature, the number of times oil/ gas mig ration and composition in the inclusions as well as the o rganic inclusion is correlated w ith the diagenesis. There are tw o migrations of oil and g as in Wenchand A Sag.The second time is the main period of oil and gas mig ration . There is only one peak of oil and gas mig ration in Wenchang B Sag.The secondary quartz in the sandstone from Zhuhai Fo rmation controls the hydrocarbon accumulatio n.
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Key words:
- Zhu Ⅲ Depression /
- diagenesis /
- hydrocarbon accumulation /
- clay mineral /
- organic inclusion
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