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深水扇是重力流搬运陆架—上陆坡沉积物至深海平原的结果,不仅记录了区域古气候环境、构造运动、相对海平面变化信息,也储集了巨量的油气资源,开展深水扇识别和发育特征研究同时具有科学意义和实践意义。应用新采集的大量三维地震数据,结合钻井和稀土元素数据,分析了琼东南盆地宝岛—长昌凹陷深水扇的发育特征和沉积物源,并总结了影响该深水区深水扇发育和分布的主要因素。研究表明,琼东南盆地宝岛—长昌凹陷中中新统梅山组发育多个深水扇,依据沉积微相组合可以划分为3类,包括陆坡峡谷—朵叶体型深水扇、深水水道—朵叶体型深水扇、深水水道化深水扇。陆坡峡谷—朵叶体型深水扇和深水水道化深水扇分别发育于宝岛凹陷和长昌凹陷北缘,物源来自海南隆起区。深水水道—朵叶体型深水扇发育于长昌凹陷南缘,物源来自凹陷南东方向的永乐隆起区。影响宝岛—长昌凹陷中中新世深水扇发育和分布的主要因素包括陆架地形和古水深、坡折带类型和坡度、古海底地貌和相对海平面下降等。
Deep-water fan is the result of gravitational flow carrying continental shelf-upland slope sediments to the deep-sea plain. It not only records regional paleoclimate environment, tectonic movement, relative sea level change information, but also accumulates huge amount of oil and gas resources, Developmental characteristics of both scientific and practical significance. Based on the large amount of 3D seismic data collected and the data of drilling and REE, the development characteristics and sedimentary origin of the deep-water fan in the Baojian-Changchang Sag, Qiongdongnan Basin are analyzed. The development and distribution of deep-water fan in the deep water area are summarized major factor. The study shows that there are three deep-water fans in the Middle Miocene Meishan Formation in the Baojian-Changchang Depression in the Qiongdongnan Basin. According to the sedimentary microfacies combination, they can be divided into three types, including the canyon-type foliage deep-water fan, the deep water channel- Body deep-water fan, deep-water waterway deep water fan. The continental slope-canopy-type deep-water fan and the deep-water aqueduct were developed in the northern margin of the Baodao Depression and the Changchang Sag, respectively. Sham Shui Po - Duo Fo body deep-water fan developed in the southern margin of Changchang Sag, the source comes from the south-east sag Yongle uplift area. The main factors influencing the development and distribution of the Middle-Miocene deep-water fan in the Baoji-Changchang Sag include the continental shelf topography and palaeo-water depth, the type and slope of slope break, the decline of ancient sea floor topography and relative sea level.