| 酒西盆地石油运移若干问题的讨论 |
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| 引用本文： | 华保钦,林锡祥.酒西盆地石油运移若干问题的讨论[J].沉积学报,1989,7(1):39-47. |
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| 作者姓名： | 华保钦 林锡祥 |
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| 作者单位： | 中国科学院兰州地质研究所 |
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| 摘 要： | 本文从酒西盆地实际资料出发,认为该区泥岩欠压实和异常地层压力主要起因于压实不平衡和烃类形成作用.指出该区异常压力可成为石油运移的动力,运移相态主要呈烃相,微裂隙可能为初次运移的主要通道.最后计算并比较了各油藏临界油柱高和二次运移条件,定量地研究了白东-单北水动力油藏中水动力的作用.
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| 关 键 词： | 异常压力 做裂隙 运移相态 临界注柱高 |
| 收稿时间： | 1988-01-04 |
DISCUSSION ON SOME PROBLEMS OF OIL MIGRATION IN JIUXI BASIN |
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| Institution: | Lanzhou Institute of Geology, Academia Sinica |
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| Abstract: | Based on the regional observations of the undercompaction and the abnormal formation pressure occurring in the source rocks of Late Jurassic and Early Cretaceous layers and of other data in Jiuxi Basin, the authors suggest that the undercompaction and abnormal pressure of argillaceous of this area is mainly caused by compaction unequilibrium and by hydrocarbon generation, while the dehydration of clay mineral and aquathermal pressuring effects are not important. The abnormal pressure with pressure coefficients about 1.2-1.3 of this area can be the driving forces of oil primary migration. The combined effect of abnormal pressure plus tectonic stress can creat microfracture. After analysis the diameters not only of the source rock' s pore and of hydrocarbon molccullar's but also of the pollen's and spore's from crude oil, the authors suggest that the pore of the source rock can allow hydrocarbon migration. Because the diameters of the pollen and spore from oil are much larger than the pore size of the source rock's, the microfracture should be the important passage of oil primary migration. This paper also deals with the problem of the phases in primary migration of petroleum. The composition comparison between the extracts of the rocks and the cruds oils shows that the saturated hydrocarbons which arc among the least water-soluble, are enriched in cruid oils. At the same time, the estimation of the hydrocarbon abundance in the pore fluid from the pyrolysis data and the porosity decrease through oil window supports that the solubility of the hydrocarbon in the solution would reach 7188-82250ppm if the migration phase were molecular solution. This ideal solubility is obviously much higher than the actual solubilty, so it is impossible that the molecular solution is the principle mode of primary migrarion of pertoleum. At the end of this paper, from the comparison of the critical heights of different oil traps, secondary migration conditions of this area are discussed. The importance of hydrodynamic action in the Baidong- Danbei hydrodynamic trap is also analysed. |
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