柴达木盆地扎哈泉地区致密油新类型的发现及其特征

发布时间：2018-06-21 03:21

  本文选题：柴达木盆地 + 扎哈泉　； 参考：《北京大学学报(自然科学版)》2017年01期

【摘要】：运用沉积学、储层地质学和有机地球化学等手段,对最近在柴达木盆地扎哈泉地区新发现的致密油藏进行研究。扎哈泉地区沉积相以滨浅湖的滩坝砂为主体,为致密油的形成打下了沉积学基础。本区致密油的产状特征是油层薄,与烃源岩呈薄互层产出,为近源自生自储关系,提供了非常有利于致密油形成的源储共生组合条件。致密油储层致密,具有微米级孔隙和纳米级孔隙,储层平均孔隙度为5.8%,平均渗透率为0.45m D,属于典型致密油藏。与致密油储层互层的古近系烃源岩的有机质类型以Ⅰ型和Ⅱ1型为主;Tmax在311~461oC之间,处于低熟至成熟阶段。有机碳含量主要分布在0.29%~4.42%之间,但多数低于1.0%,比现阶段致密油烃源岩的标准明显偏低,属于一种特殊类型。与其他盆地相比,虽然柴达木盆地扎哈泉地区致密油烃源岩有机质丰度偏低,但该地区咸化湖泊环境使其具有生烃转化率高的典型特点,因此,同样可以生成较多的液态烃类,预示柴达木盆地致密油勘探具有很大的潜力。
[Abstract]:By means of sedimentology reservoir geology and organic geochemistry the newly discovered compact reservoirs in Chahaquan area of Qaidam Basin were studied. The sedimentary facies in Zahaquan area are mainly beach and dam sand of shallow lake, which lays the sedimentological foundation for the formation of dense oil. The occurrence of dense oil in this area is characterized by thin oil layer and thin interbedded production with source rock, which provides a very favorable condition for source storage and symbiotic assemblage in the formation of dense oil. The tight oil reservoir is compact, with micrometer and nanometer porosity, the average porosity is 5.8 and the average permeability is 0.45m. it is a typical tight reservoir. The organic matter types of Paleogene source rocks interbedded with tight oil reservoirs are mainly type 鈪，

本文编号：2046972