本文選題：礫石顆粒 + 沖積扇模擬實驗�。� 參考：《斷塊油氣田》2017年03期

【摘要】：通過觀察和記錄沖積扇自旋回沉積模擬實驗,研究在沖積扇的發(fā)育過程中,礫石顆粒對沖積扇在沉積過程中的控制機理。研究表明:在同一期洪水期的中期—后期,在沖積扇扇根片流帶中,溝流發(fā)育的優(yōu)勢方向與礫石顆粒初期分布有著重要關(guān)系,同時礫石顆粒的分布還控制著溝流改道;在沖積扇的扇中發(fā)育過程中,由于礫石顆粒是在牽引流的搬運作用下運動,因此對溝道的控制作用便更多體現(xiàn)在對溝道形態(tài)的改造與砂壩的形成上。通過對比沖積扇剖面中出現(xiàn)的多期辮流水道疊置、砂壩和溝道的分布狀態(tài),就能夠驗證實驗過程中沖積扇表面發(fā)生的現(xiàn)象。在實驗過程中,沖積扇形成的規(guī)模是與碎屑流的動力、攜帶沉積物和沉積時間呈正比關(guān)系。在碎屑流的動力與攜帶的沉積物相對沒有變化的穩(wěn)定期內(nèi),扇根的砂壩與溝流、扇中的溝道都與礫石顆粒的作用密切相關(guān)。
[Abstract]:By observing and recording the simulation experiment of alluvial fan spin-cycle deposition, the control mechanism of gravel particles on alluvial fan during the development of alluvial fan was studied. The results show that the dominant direction of trench flow development is closely related to the initial distribution of gravel particles, and the distribution of gravel particles also controls the diversion of channel flow in the middle to late flood period of the same period. During the development of alluvial fan, the gravel particles move under the action of traction flow, so the control of channel is more reflected in the transformation of channel shape and the formation of sand dam. By comparing the distribution of multi-stage braided channel, sand dam and channel in the alluvial fan profile, the phenomenon on the surface of the alluvial fan can be verified. In the experimental process, the scale of alluvial fan formation is proportional to the power of the clastic flow, and the sediment carrying is proportional to the deposition time. During the stable period in which the dynamics of the clastic flow and the sediment carried by it are relatively unchanged, the sand dam at the fan root, the channel in the fan and the channel in the fan are all closely related to the action of the gravel particles.
【作者單位】： 長江大學地球科學學院;中國石油大學地球科學學院油氣資源與探測國家重點實驗室;
【基金】：國家自然科學基金項目“同生逆斷層對沖積扇沉積構(gòu)型的控制作用機理——沖積扇沉積過程分析與沉積過程研究”(41372116)
【分類號】：P512.2
，

本文編號：1954983