Deepwater Mass Transport Deposition System of Huaguang Depression, Qiongdongnan Basin and Its Significance for Hydrocarbon Exploration
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摘要: 重力搬运沉积作用形成的岩性地层圈闭对深水油气勘探具有非常重要的作用.为弄清琼东南盆地华光凹陷重力搬运沉积特征, 基于近年新采集的地震资料和经典层序地层模式, 开展了该区的深水沉积特征研究.南海西北部深水区重力搬运沉积特征发育, 主要包括中新统三亚组发育的复合水道、上新统变形滑坡体及第四系深水浊积水道.三亚组复合水道具有典型的强弱振幅相互叠置特征, 上新统变形滑坡体具有典型的下部变形、上部滑坡的双层结构, 第四系深水浊积水道具有典型的侧向迁移、分支水道等特征.这些沉积特征的形成与越南隆起的物源供给有关.复合水道充填可作为潜在的深水储层, 滑塌体的形成可能与天然气水合物的形成或解体有关.Abstract: The stratigraphic trap formation by mass transport deposition (MTD) in the deepwater area is very important for the deepwater exploration and production.Based on the new seismic data acquired recently and classic sequence stratigraphy theory, we study the deepwater deposition characteristics of Huaguang depression, Qiongdongnan basin.The sedimentary features relates with MTD develop since Miocene, including channel complex developed in Miocene Sanya Formation, Pliocene deformation slide layer and Quaternary deepwater turbidite channels.The Miocene channel complex has typical shingle structure of high amplitude and low amplitude reflection; the Pliocene deformation slide layer has typical deformation feature of lower part and slide of upper part; the Quaternary deepwater turbidite channels have typical lateral migration and bifurcation.These sediment phenomena are related with the sediment supply from the Vietnam uplift.The channel complex in Sanya Formation could be the potential reservoir of the slope deepwater area, and the formation of deformation slide layer may be related with the gas hydrate.
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图 3 过复合水道的N-S走向剖面及其解释图
(位置见图 1)
Fig. 3. N-S trend seismic profile and interpretation map across the channel complex of Sanya Formation
图 4 过滑坡体的E-W走向(a)和SN走向(b)剖面及其解释图
(位置见图 1)
Fig. 4. E-W trend (a) and SN (b) seismic profile and interpretation map across the slide
图 5 相干时间切片显示深水水道的平面特征
(位置见图 1)
Fig. 5. Coherence time-slice shows the plane characteris- tics of deepwater channels
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