文留地区泥岩裂缝油气地球化学特征分析

东濮凹陷泥岩裂缝油气藏还处在勘探初级阶段,泥岩裂缝油气藏一般属自生自储型.与砂岩油气藏成因不同,通过对文留地区沙三2亚段泥岩裂缝中可溶有机质(油)的饱和烃和芳香烃组分进行气相色谱和气相色谱-质谱分析,认为泥岩裂缝油是来源于以藻类和浮游生物贡献为主的有机质在含盐度较高的还原环境中热演化到成熟阶段所生成的产物,有机质类型较好,丰度值高.证明文留地区泥岩裂缝油气有充足的油气源,勘探前影响良好.

Geochemistry characteristics and origin of shale fracture oil and gas reservoir in Wenliu region

The exploration for shale fracture oil and gas reservoir in Dongpu Depression is still in preliminary stage.Shale fracture oil and gas reservoir generally belongs to the authigenic storage type whose origin is different from that in sandstone reservoir.Through the gas chromatograph analysis on the saturated hydrocarbon and aromatic hydrocarbon components in the dissolvable organic materials which come from the shale fracture reservoir in Es32 of Wenliu area,our opinion is that the oil in shale fracture reservoir is the result of the process of algae and plankton riched organic materials thermal evolved to the mature stage in high salinity deoxidation environment.The good type and abandant enrichment of the organic materials can be evidence of oil and gas,which has plenteous source and nice prospect of exploration.