白云深水区珠海组陆架边缘三角洲沉积演化

发布时间：2018-12-15 19:52

【摘要】：针对白云深水区渐新世陆架边缘三角洲沉积规律尚不明确的问题,根据沉积学理论,结合测井、地震、岩心资料,在分析研究区珠海组陆架边缘三角洲沉积微相特征的基础上,对其内部结构和期次划分进行探讨,揭示了此类沉积体系垂向动态演化特征并建立演化模式。研究发现,研究区陆架边缘三角洲具有前积层厚度大、发育深水遗迹化石、伴生发育海底扇等特征。依据地震剖面上前积结构样式的不同,由底至顶可划分为4期,第1期受断裂坡折影响,三角洲前方的海底扇发育;后3期受沉积坡折影响,第2期沉积期物源供应充分,沉积范围较第1期大;第3期沉积期海平面上升到最大,其范围及其前方滑塌规模均最小;第4期沉积期海平面又发生大规模下降,三角洲前方的滑塌发育规模最大。该研究丰富了中国渐新世陆架边缘三角洲沉积体系的认识,可为深水区的油气勘探提供借鉴。
[Abstract]:In view of the unclear sedimentary regularity of Oligocene continental shelf margin delta in Baiyun deep water area, according to sedimentology theory, combined with logging, seismic and core data, the characteristics of sedimentary microfacies in Zhuhai continental shelf margin delta are analyzed. The internal structure and time division are discussed, and the vertical dynamic evolution characteristics of these sedimentary systems are revealed and the evolution model is established. It is found that the deltas of the continental shelf in the study area are characterized by the large thickness of the forelayer, the development of deep-water trace fossils and the associated development of seafloor fans. According to the different structural styles of the seismic profile, from bottom to top can be divided into 4 periods, the first stage is affected by the fault slope break, and the submarine fan in front of the delta develops. The latter three periods are affected by the sedimentary slope break, the second period is fully supplied and the sedimentary range is larger than that of the first stage, the sea level rise of the third period is the largest, and the scope and the scale of the front collapse are the smallest. The sea level fell again in the fourth sedimentary period, and the collapse in front of the delta was the largest. This study enriches the understanding of Oligocene marginal delta sedimentary system in China and can be used for reference for oil and gas exploration in deep water area.
【作者单位】：中国地质大学(北京);中海石油(中国)有限公司深圳分公司;
【基金】：国家自然科学基金“南海北部新近纪陆架坡折的发育演化及其对南海盆地动力学过程的沉积响应”(91328201)
【分类号】：P512.2;P618.13

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