三肇凹陷扶余油层致密油资源评价与参数研究

松辽盆地三肇凹陷扶余油层发育河流-浅水三角洲环境下形成的低渗透致密砂岩储集层,已发现的探明储量以常规砂岩储层中的岩性油藏为主。剩余资源以赋存于孔隙度小于10%、渗漏率小于1×10^-3 μm²储集层中的致密油为主。本文分析三肇凹陷扶余油层致密油成藏条件,采用致密油的资源评价方法(小面元容积法、资源丰度类比法及EUR类比法)对研究区源下致密油资源进行评价,并初步估算青山口组一段泥岩的生烃量,获取了泉四段致密油的地质资源量、运聚系数、最终可采资源量、可采系数、地质资源丰度和可采资源丰度等关键参数,这类参数代表了松辽盆地源下致密油资源评价的关键参数,对评价其它地区相同类型的致密油具有借鉴意义。

Resource evaluation and study on key parameters of tight oil in Fuyu oil layer in Sanzhao depression

The Fuyu oil layer of Sanzhao depression in northern Songliao Basin developed a set of low permeable tight sandstone reservoirs formed in river to shallow-water delta environments. Proven reserves was preserved in conventional reservoir rocks, and lithology reservoir was the main reservoir type. While the remaining exploration targets will be tight reservoir with porosity less than 10% and permeability less than 1×10^-3 μm². Based on analysis of tight oil accumulation in Sanzhao depression of northern Songliao Basin, three unconventional resource assessment methods, which are volumetric method of small cells, resource abundance analogy and EUR analogy, have been used to evaluate tight oil in Fuyu oil layer of Sanzhao depression in this paper. Hydrocarbon generation quantity of lacustrine source rocks in the 1st member of Qingshankou Formation has also been estimated based on the genetic resources assessment. Therefore, a serial of key parameters, such as geological resource, hydrocarbon migration and accumulation coefficient, recovery rate, resource abundance of tight oil in this area can be calculated, which represent key parameters of a type of tight oil that below source rocks in Songliao Basin. This study can also be used for reference when the same kind of tight oil evaluation is carried out in other areas.