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为查明辽河坳陷东部凹陷古近系有利储集相带类型和分布规律,以钻井剖面、测井曲线分析、岩心观察和粒度分析为基础,对东部凹陷古近系沉积体系进行了全面研究。确定东部凹陷西部斜坡带具备辫状河三角洲的形成条件,并确定了辫状河三角洲沉积体系发育范围和层位,识别了辫状河三角洲沉积亚相及微相。研究认为,东部凹陷古近系辫状河三角洲沉积体系与构造活动具有很好的耦合性,河流入口常位于构造传递带内,断层带常为沉积(亚)相分界,构造坡折带为碎屑沉积物有利堆积场所,辫状河三角洲前缘砂体为最有利的储集相带。
In order to find out the type and distribution of the favorable reservoir facies belt in the eastern depression of Liaohe Depression, the sedimentary system of the Paleogene in the eastern sag has been comprehensively studied based on drilling section, well logging curve analysis, core observation and particle size analysis . The formation conditions of the braided river delta in the western slope belt of the Eastern Depression are determined. The development range and horizon of the braided river delta sedimentary system are determined, and the sedimentary subfacies and microfacies of the braided river delta are identified. The study suggests that the sedimentary system of the braided river delta in the eastern sag has good coupling with the tectonic activity. The river inlet is often located in the tectonic transfer belt, and the fault zone is often the sedimentary (sub) phase boundary, and the structural slope break zone is broken Sediment deposition favorable sites, braided river delta front sand body is the most favorable reservoir facies belt.