东濮凹陷沙三下亚段页岩油资源潜力评价

Resource Potential Evaluation of Es_3~L Shale Oil in Dongpu Depression

针对东濮凹陷沙河街组三段下亚段(Es_3~L)地质、地化特征,结合测井地球化学技术,进行页岩油资源潜力评价。通过对地化数据实测点的整理分析可得:东濮凹陷Es_3~L北部泥页岩w(TOC)、氯仿沥青"A"、生烃势平均值分别0.87%、0.17%、6.17mg/g,南部分别0.36%、0.06%、2.31mg/g;泥页岩有机质类型以Ⅱ型为主;成熟度镜质体反射率(Ro)主要集中在0.5%~1.5%之间;泥页岩含油性好,最高可达300mg/g。利用东濮凹陷分层数据计算出Es_3~L泥页岩平均厚度在240m左右,且沙三段(Es3)北部地层盐岩发育,为页岩油提供了良好的保存条件。利用ΔlogR法建立有机非均质性模型,获取纵向连续的氯仿沥青"A"。通过体积法计算出东濮凹陷Es_3~L页岩油资源总量为10.67×10~8t,其中,Ⅰ级资源量可达6.7×10~8t,明显大于Ⅱ、Ⅲ级。总体来说,东濮凹陷Es_3~L具有较大的页岩油资源潜力及良好的开采前景。

Aiming at the geological and geochemical features of Es_3~L in Dongpu Depression,combined with logging geochemistry method,shale oil resource potential was evaluated.Through analyzing geochemical data,the results showed that w(TOC),chloroform bitumen'A',the average value of hydrocarbon genetic potential of shale in the north of Dongpu Depression were 0.87%,0.17%and 6.17mg/g respectively.The values in the south of Dongpu Depression were 0.36%,0.06%and 2.31mg/g respectively.Shale organic matter mainly belonged to TypeⅡ,its maturity mainly was between 0.5%and 1.5%.The oil-bearing property of shale was good with the highest value of 300mg/g.According to hierarchical data,calculation indicated that the average thickness of Es_3~L shale was about 240m,salt rock was developed in the north of Es_3~L ,it provided a good condition for shale oil preservation.an organic heterogeneity model was established withΔlogR method,the longitudinal continuous chloroform bitumen'A'was obtained.With the volume method the calculated shale oil resources of Es_3~L in Dongpu Depression is 10.67×108t,among which GradeⅠresource can reach 6.7×108t,which is obviously higher than GradesⅡandⅢ.Generally speaking,shale oil resources of Es_3~L in Dongpu Depression have large resource potential and good exploration prospect.