KEY EPISODES OF PETROLEUM MIGRATION AND ACCUMULATION IN THE SOUTHWEST EDGE OF JIANGHAN BASIN
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摘要: 通过原油中含氮化合物的地球化学变化特征对比分析,指出江汉盆地西南缘的油气主运移方向是由北边的主生油凹陷(梅槐桥凹陷)向南(复兴场、采穴区带)运聚;利用流体包裹体、激光拉曼光谱和显微荧光分析等方法技术,对江汉盆地西南缘的成藏期次进行了研究,认为该区存在2期充注期:下第三系荆沙组沉积早期和下第三系潜江组沉积中、晚期。在此基础上,提出了3种成藏模式:源内—断鼻—相控油气成藏模式(自生自储)、源内—断鼻—断控油气成藏模式(下生上储)以及源边—断块—断裂和相控油气成藏模式。Abstract: According to analysis of geochemical features of nitrogen compounds in crude oil, petroleum migration direction in the southwest edge of Jianghan Basin is from the main petroleum-generating depression(the Meihuaiqiao Depression) in the north to the Fuxinchang,Caixue Belt in the south.With techniques such as fluid inclusion,laser Raman spectrum and micro-fluorescence analysis,it is studied the episodes of oil pools formation.There are two episodes for petroleum to entrap: the first one is the early period of Jingsha Formation of Lower Tertiary,the second one is the medium-late period of Qianjiang Formation of Lower Tertiary. Three patterns to form oil-pools are put forward: the Inner Source-Nose-Like Fault-Facies-Controlled(self-generated and self-stored),the Inner Source-Nose-Like Fault-Fault-Controlled(generated in the lower section and stored in the upper section) and the Marginal Source-Faulted Block-Fracture and Facies-Controlled.
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