本文選題：沖積扇　切入點(diǎn)：沉積特征　出處：《油氣地質(zhì)與采收率》2017年05期 　論文類型：期刊論文

【摘要】：沖積扇是重要的油氣儲(chǔ)集體,具有內(nèi)部結(jié)構(gòu)復(fù)雜、非均質(zhì)性強(qiáng)的特點(diǎn)。通過野外剖面實(shí)測、遙感影像分析等方法,對位于青海湖北部的3個(gè)沖積扇(泉吉河扇、沙柳河扇和爛泥灣扇)進(jìn)行沉積亞相的劃分和沉積微相的識(shí)別。對于泉吉河扇和沙柳河扇,在扇根亞相中識(shí)別出辮狀河道、主水道和主水道間微相,在扇中亞相中識(shí)別出辮狀河道、心灘、漫流微相和低粘度碎屑流沉積,在扇緣亞相中識(shí)別出漫流微相和泥灘微相。爛泥灣扇發(fā)育2期泥石流作用和短暫的牽引流作用。根據(jù)沉積特征將沙柳河扇和泉吉河扇的沉積演化過程劃分為4個(gè)階段,分別為初次碎屑流沉積及主水道發(fā)育階段、低粘度碎屑流沉積階段、廣泛的辮狀河道發(fā)育階段、河道遷移及三角洲發(fā)育階段。將爛泥灣扇的沉積演化過程劃分為3個(gè)階段,分別為早期泥石流沉積階段、間歇期牽引流沉積階段和后期泥石流沉積階段。研究結(jié)果表明,物源條件的差異是造成研究區(qū)3個(gè)現(xiàn)代沖積扇沉積特征差異的主要原因,氣候條件中的濕度和風(fēng)場對青海湖北部沖積扇的沉積也具有一定的控制作用。
[Abstract]:Alluvial fan is an important oil and gas reservoir with complex internal structure and strong heterogeneity. Three alluvial fans (Quangji River fan) located in the northern part of Qinghai Lake were studied by field profile measurement and remote sensing image analysis. For the Quangji River fan and the Shaliu fan, the braided channel, the microfacies between the main waterway and the main waterway are identified in the fan root subfacies. The braided channel, core beach, diffuse microfacies and low viscosity clastic flow deposits were identified in the central facies of fan. The diffuse microfacies and mudflat microfacies were identified in the subfacies of fan margin. The debris flow and the transient tractive flow in the second stage of the development of the muddy bay fan were identified. According to the sedimentary characteristics, the sedimentary evolution of the Shaliuhe fan and the Quanji river fan were divided into four stages. The sedimentary evolution of the muddy bay fan is divided into three stages: the primary clastic flow deposition and the main channel development stage, the low viscosity detrital flow deposition stage, the extensive braided channel development stage, the channel migration stage and the delta development stage. The results show that the difference of provenance conditions is the main reason for the difference of sedimentary characteristics of the three modern alluvial fans in the study area. The humidity and wind fields in climatic conditions also control the deposition of alluvial fans in the northern part of Qinghai Lake.
【作者單位】： 中國地質(zhì)大學(xué)(北京)能源學(xué)院;中國石化勘探分公司勘探研究院;
【基金】：國家科技重大專項(xiàng)“陸相深水儲(chǔ)集體成因與地質(zhì)評價(jià)新方法”(2017ZX05009-002)
【分類號(hào)】：P618.13

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