针对大民屯凹陷安福屯陡岸砂砾岩体岩相变化快、含油性差异大的特点,运用地质综合研究方法,进行古地貌恢复、沉积相分析、储层特征微观研究。研究表明:西部断槽带普遍发育厚层状扇三角洲砂砾岩体,具有裙带状多期叠覆式分布特征。安福屯扇体前缘亚相砂岩类储层粒间溶孔发育,储集性能和油气显示情况普遍较好;砂体与洼陷泥岩直接接触,具有近源优先捕获油气的条件,明确扇三角洲前缘亚相为优势岩相带。安福屯陡岸砂砾岩体“相带控储、物性控藏”特征显著。该研究对于西部断槽内其他砂砾岩体油气勘探具有指导意义。
In view of the characteristics of rapid lithofacies change and great difference in oil-bearing property of the glutenite mass in Anfutun steep bank of Damintun Sag, comprehensive geological research method was used for paleogeomorphic restoration, sedimentary facies analysis and microscopic study of reservoir characteristics. It was found in the study that thick layered fan delta glutenite was widely developed in the western fault trough belt, with the characteristics of skirt belt multi-stage overlapping distribution. The subfacies sandstone reservoir in the Anfutun fan front was developed with intergranular dissolved pores, presenting sound reservoir properties and hydrocarbon occurrence; the sand mass was in direct contact with the mudstone of the depression, which was condcutive to preferential capture of oil and gas near the source, and it was clear that the subfacies at the fan delta front was the dominant lithofacies. The glutenite mass at the Anfutun steep bank was characterized by "reservoir control with facies zone and reservoir control with physical properties". This research is of guiding significance for hydrocarbon exploration of other glutenite masses in the western fault trough.
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