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物源分析对确定沉积盆地物源区位置、沉积物搬运路径和沉积体系具有重要意义,还可以通过物源分析准确预测远景区油气生、储及盖层分布。通过砂岩碎屑组分、重矿物组合、ZTR指数进行分析,利用沉积法对地层沉积厚度以及砂岩含量分布特征进行研究,确定了饶阳凹陷馆陶组的物源方向。结果表明:饶阳凹陷馆陶组存在2个物源区,分别为东北部和西南部物源区,2个物源区的母岩类型都以变质岩为主,并在凹陷中部留路地区汇聚;东北部物源区为长石质岩屑砂岩区,成分成熟度较低,西南部物源区成分成熟度比东北部物源区略有提高,为岩屑质长石砂岩区,双向物源汇聚的留路地区为长石砂岩区。在物源体系的控制下,近源发育辫状河沉积,远源发育曲流河沉积,心滩和边滩砂为有利砂体,物源汇聚的留路地区为有利勘探区。物源方向的确定对研究沉积相展布、有利砂体分布及有利勘探区预测具有重要的意义。
The provenance analysis plays an important role in determining the source area location, sediment transport path and sedimentary system in the sedimentary basin, and can also accurately predict the distribution of oil, gas, reservoir and caprock in the prospective area through the provenance analysis. Based on the analysis of sandstone detrital components, heavy mineral assemblages and ZTR index, sedimentary thickness and distribution of sandstone contents were studied by sedimentary method, and the provenance direction of Guantao Formation in Raoyang Depression was determined. The results show that there are two provenance areas in the Guantao Formation in the Raoyang Sag, which are the provenance areas in the northeast and southwest respectively. The parent rock types in the two provenance areas are dominated by metamorphic rocks and remain in the middle of the depression The source area of the northeastern part is feldspathic lithic sandstone with low maturity. The maturity of the source area in the southwest is slightly higher than that of the source area in the northeast, The confluence of the provenance area is feldspar sandstone area. Under the control of the provenance system, braided river deposits near the source, meandering river sediments, heart beach and side beach sand are favorable sand bodies, and the remaining areas where the provenances converge are the favorable exploration zones. The determination of provenance direction is of great significance for the study of sedimentary facies distribution, favorable sandbody distribution and favorable exploration area prediction.