CHARACTERISTICS OF FLUID INCLUSIONS IN THE SHIWANDASHAN BASIN OF GUANGXI PROVINCE AND ITS APPLICATION IN PETROLEUM GEOLOGY
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摘要: 利用流体包裹体手段对盆地中主要生油和储集层的下三叠统、二叠系和泥盆系中进行了定量评价。研究表明:岩石中流体包裹体捕获过程可划分出7个不同时期,并分别与沉积成岩和构造各阶段相对应。文中提供了各个时期油气生成运聚环境的热力学参数,同时分析了两个地点油气生、运、聚的演化历史;主要认识可归纳为:油气初次运移与异常压力有关;构造运动引起油气多次运移;而构造裂隙为主要油气运移通道;油气运移为多相态不混溶流体;指出本区三叠统为最好的油源岩,下泥盆统为本区的气源岩;本区北部火山岩对油气的富集作用有益;东南部的花岗岩侵入作用对油气成藏造成破坏。Abstract: For quantitative evaluation of oil and gas resources of the Lower Triassic,the Permian and the Devonian strata for main source and reservoir beds, the fluid inclusion studies was carried out. The results demonstrated that the fluid inclusions trapped in the rocks can be assigned to seven stages in corresponding to different deposition-diagenesis-tectonic stages. Moreover, the thermodynamic parameters of oil and gas with relation to formation environment in the different stages herein be presented, and the history of generation-migration-accumulation of oil and gas in two areas be analyzed. The concerned evidence shows that the primary oil migration was related to the abnormal pressure. While the multiple oil migration to the tectonic movements, the main channels of oil-gas migration were tectonic fractures. The fluids containing oil and gas can be considered as the multiphase immiscible fluid. The data available can be summarized as: the Lower Triassic strata are the best oil-source rocks, and the Devonian strata belong to the gas-source rocks in this region. In addition, the pyroclastic rocks in the north of the region has a positive influence on the generation and evolution of oil and gas, and the granites occurred in the southeast has no affect on the oil and gas pools formation.
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Key words:
- the Shiwandashan Basin /
- fluid inclusion /
- application /
- petroleum geology
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[1] 李载沃.十万大山盆地构造特征探讨[A].中国含油气区构造特征[C].北京:石油工业出版社,1989.242-249. [2] 刘斌,沈昆.流体包裹体热力学[M].北京:地质出版社,1999.171-248. [3] Mclimans R K. The application of fluid inclusion to migration of oil and diagenesis in petroleum reservoirs[J]. Appl Geochem, 1987,2:585-603.
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