泌阳凹陷大仓房组上部生油性及潜力分析

泌阳凹陷大仓房组上部发育半深湖相,其暗色泥岩有机质丰度较高,母质类型为Ⅱ1型,处于高成熟演化阶段,具有较强的生烃潜力。油源对比表明,大仓房组原油物性、碳同位素、饱和烃色谱、芳烃色质等特征与核二、核三段原油存在较大的差异,而与大仓房组深灰色泥岩的地化特征相似,属自生自储。南部陡坡带双河-赵凹-安棚一带是勘探大仓房组的有利地区。

On the Source Nature of Upper Dacangfang Formation in Biyang Depression and Estimation of Its Potentiality

Semibathile facies was developed in the upper Dacangfang formation of Biyang depression, and its dark mudstones with parent material of type Ⅱ₁ and being organic abundant, have reached a high maturation stage suggesting a strong generation potential. Based on oil-source correlation, the authors believe that the oil of Dacangfang much differs from those of Eh₂ and Eh₃ members in terms of physical properties, carbon isotopics, chromatography of saturated hydrocarbons, GC-MS characteristics of aromatic hydrocarbons, but geochemically similar to the dark grey mudstones in Dacangfang formation, i.e. attributed to authigenic and authi-reservoired deposits. The belt of Shuanghe-Zhaoao-Anpeng in the steep slope th the south is considered as a favourable area in Dacangfang formation.