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强制海退体系域的识别特征与成因分析 被引量:9

Recognition criteria and genesis of falling stage systems tract
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摘要 利用地震反射终止关系、滨线迁移轨迹特征、钻测井信息和沿层振幅属性,探讨珠江口盆地13.8 Ma强制海退体系域(FSST)的识别、演化和成因。研究结果表明:FSST在倾向方向具有高角度前积反射,滨线迁移轨迹呈下降或水平的趋势,沿走向出现下切谷。FSST的测井曲线呈漏斗状,W1井的GR曲线表现为4个明显的反旋回,对应4期准层序组。每个准层序组具有向上变浅和顶部突变成深水的相标志,分别受四级基准面变化的控制。白云凹陷北坡13.8 Ma FSST沿岸线具有不同的沉积展布特征。西部呈强振幅的朵状外形,砂层组厚度大,为主河道发育区;东部呈振幅强弱相间的条带状,是受到NE方向占优势的强沿岸流影响的结果。13.8 Ma古珠江三角洲具有浪控"非对称三角洲"的特征,深水区西部储层优于东部。寒冷的古气候造成的海平面下降是控制13.8 Ma FSST发育的最主要原因,而FSST的平面展布形态又是物源供给强弱、河口发育位置、陆架宽度、陆坡坡度、沿岸流以及潮汐作用的综合结果。 Based on the seismic reflection termination, shoreline trajectory behavior, drilling and logging data, and the horizon slice with the root-mean-square amplitude extraction, the identification, evolution and genesis of the falling stage system tract(FSST) in the Pearl River Mouth Basin near 13.8 Ma were discussed. The results show that the seismic reflection characteristics of the FSST present high angle progradation in dip orientation. The shoreline trajectory shows descending or horizontal trend and the incised valleys are often observed along the strike orientation. In addition, the log curve of the FSST takes funnel shape. Especially, the GR curve of well W1 presents four reverse cycles obviously, corresponding to four sessions of parasequence sets. Each parasequence set shows upward shallowing succession and its top suddenly changes into deep water facies controlled by the fourth-order base-level fluctuation, respectively. Sedimentary distribution characteristics of the FSST near 13.8 Ma are different along the strike orientation in the northern Baiyun Sag. In the western area, the seismic attribute shows higher amplitude and "lobate" shape, which reflects the development of main river channels with thick sand body. However, due to the strong affection of the NE oriented alongshore current, the amplitude extraction of horizontal slices show stripped shape in the eastern area. The paleo Pearl River delta near 13.8 Ma is a wave-influenced and asymmetric delta. Reservoir property in the western deep-water area is better than that in the eastern area. Resulting from the cold ancient climate, the falling of sea level is the main reason of the development of the FSST near 13.8 Ma. The plan distribution pattern of the FSST is a comprehensive result of the provenance supply capacity, estuary development location, shelf width, slope gradient, coastal current and tidal action.
出处 《中南大学学报(自然科学版)》 EI CAS CSCD 北大核心 2016年第2期531-540,共10页 Journal of Central South University:Science and Technology
基金 国家自然科学基金资助项目(41372115) 国家重点基础研究发展规划(973计划)项目(2009CB219407)~~
关键词 珠江口盆地 白云凹陷 层序地层学 强制海退体系域 Pearl River Mouth Basin Baiyun sag sequence stratigraphy falling stage systems tract
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