Sequence Architecture and Favorable Reservoir Prediction of Sanya Formation in the Central and Eastern Qiongdongnan Basin
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摘要: 三亚组为琼东南盆地中东部②号断裂带地区重要的勘探目的层段之一.运用地震资料并结合钻井等其他资料, 将三亚组划分为2个三级层序: S60—S52、S52—S50, 并指出这2个层序发育的背景为挠曲双陆架坡折型.其中S60—S52层序表现出断拗转换阶段的特征, S52—S50层序则为隐伏断裂控制的挠曲坡折的特征.层序内体系域的发育受上述层序地层格架的控制, 下切谷、斜坡扇等低位体在S60—S52层序内较发育, 前积楔、斜坡扇等低位体在S52—S50层序内较发育.2个层序内海侵和高位体系域均受双坡折带控制, 并可划分出滨浅海陆架、陆坡和深海-半深海等沉积体系.指出了②号断裂带三亚组内的有利勘探区带.Abstract: The Sanya Formation is one of the most important exploration layersin the area ajacent ② fault belt, central and eastern Qiongdongnan basin. The Sanya Formation can be divided into two third-order sequences (S60-S52, S52-S50) based on the integrated analysis of seismic and logging well data. The sequence of S60-S52 is formed on the beginning of thermal subsidence after rifting. This sequence and overlying one of S52-S50 are characterized by occurrence of the flexural slope-break, which is controlled by deep buried faults. Two slope-breaks constrain the development of system tracts in third-order sequence. Incised valley and slope fan are observed commonly in lowstand system tracts(LST)of the S60-S52 sequence, progradational wedge and slope fan occur widely in LSTof the S52-S50 sequence. Depositional systemsin transgressive system tracts and highstand system tracts are also controlled by double shelf slope-break zones which are taken as the boundary of different depositional systems from littoral shelf to continental slope, bathyal sea to deep sea. The results suggest that the Sanya Formation near the ② fault belt taken as the slope break zone is a favorable area for hydrocarbon exploration.
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Key words:
- Qiongdongnan basin /
- ② fault belt /
- Sanya Formation /
- sequence pattern /
- favorable area
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图 1 琼东南盆地(a) 及其②号断裂带(b) 构造格架
1.一级构造单元界; 2.二级构造单元界; 3.剥蚀线; 4.地名; 5.断层及编号; 6.推测的断层线; 7.凹陷; 8.凸(隆) 起; 9.文中所指构造
Fig. 1. Structural framework of Qiongdongnan basin (a) including ② fault belt (b)
图 2 琼东南盆地中东部②号断裂带地区层序界面特征
a.②号断裂带松涛区S60、S52层序界面特征; b.②号断裂带S60—S52层序斜坡扇地震反射特征; c.②号断裂带地区S52—S50层序前积楔、斜坡扇地震反射特征; d.②号断裂带松涛区S50层序界面特征
Fig. 2. Sequence boundary characteristics in the area of ② fault belt, central and eastern of Qiongdongnan basin
图 3 琼东南盆地中东部②号断裂带地区三亚组层序格架特征
Fig. 3. Sequence framework characteristics of Sanya Formation in the area of ② fault belt, central and eastern of Qiongdongnan basin
图 4 琼东南盆地中东部②号断裂带地区S60—S52层序低位体系域空间配置
1.下切谷或前积楔; 2.斜坡扇或盆底扇; 3.陆架区或(陆架) 暴露区; 4.深凹浅海或深海平原区; 5.陆坡区(上/下); 6.晚期坡折线; 7.早期坡折线; 8.陆坡/盆地界线; 9.物源方向
Fig. 4. Spatial map of lowstand system tract of S60-S52 sequence in the area of ② fault belt, central and eastern of Qiongdongnan basin
图 5 琼东南盆地②号断裂带S52-S50层序低位体系域空间配置
1.下切谷或前积楔; 2.斜坡扇或盆底扇; 3.盆底扇; 4.陆架区或(陆架) 暴露区; 5.深凹浅海或深海平原区; 6.陆坡区(上/下); 7.晚期坡折线; 8.早期坡折线; 9.陆坡/盆地界线; 10.物源方向
Fig. 5. Spatial map of lowstand system tract of sequences S52-S50 in ② fault belt of Qiongdongnan basin
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