江南-雪峰山推覆体前缘沥青古油藏及油源对比

The characters of the old asphalt-oil pool in the Jiangnan-Xuefeng thrust nappe front and the correlation of oil sources

在江南-雪峰山推覆体前缘,下古生界中分布着一系列沥青古油藏。经野外实地观察调查,发现其主要赋存特征有:裂隙型炭沥青、溶洞-孔隙型沥青、裂隙-背斜型沥青、背斜-岩性复合型炭沥青。经过对所采集样品进行地球化学特征综合分析,认为本地区的有机质成熟度较高,并经受多期改造演化。油源对比结果显示,其主要来源于下寒武统的烃源,其次为下志留统的烃源。这一地区的沥青古油藏是一种多源多期成因,并经历了后期强烈改造。

A series of ancient asphalt-oil pools formed in Lower Paleozoic in the front of the Jiangnan- Xuefeng trust nappe. By way of field study, the authors found out the main accumulation characteristics of the ancient asphalt-oil pools. They are carbon asphalt of crevice type, asphalt of cavern-porosity type, asphalt of crevice-anticline and asphalt of anticline-lithological complex type. Via synthetic analysis of the geochemical characters of all collected samples, the authors found DOM in this area is high and the organic matter has gone through multiperiodic alterations and evolvements. The correlation of oil sources shows that these old asphalt-oil pools mostly root in the oil sources of Lower Cambrian and secondly in the oil sources of Silurian. The ancient asphalt-oil pool in this area is a sort of asphalt-oil pool that has multiperiodic and multisource geneis and has gone, strong evolvemens in the late period.