UPPER OLIGOCENE-EARLY LOWER MIOCENE SEDIMENTARY FACIES AND RESERVOIR DISTRIBUTION PATTERN IN WENCHANG H ZONE IN THE WESTERN PEARL RIVER MOUTH BASIN
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摘要: 珠江口盆地西部文昌H区毗邻神狐隆起,晚渐新世-早中新世早期潮汐和河流作用是该区主要的地质营力,控制和影响着沉积作用机制与砂体的展布形态。珠海组时期,在半封闭的海湾-潮坪沉积背景下,该区受到珠三南断裂的活动影响,接受来自神狐隆起近源堆积的扇三角洲沉积,断裂活动性和母岩的差异性控制了点物源的推进范围、展布样式和储层物性特征。同时由于前端受到海水的破坏和改造,兼具河流和潮汐共同作用的典型沉积特征。珠江组时期,海平面逐渐上升,在相对闭塞的障壁岛-潟湖背景下发育涨潮三角洲沉积,潮汐通道位于神狐隆起北段中缘的低洼部位,受到潮汐往复作用的冲刷,多期潮汐砂坝叠合发育。通过微古地貌和井震结合分析,刻画线性砂坝的分布,进而总结了研究区优质储集体的展布规律。Abstract: The Wenchang H zone was adjacent to the Shenhu uplift in the west of the Pearl River Mouth Basin. Tidal and fluvial processes were the main geological forces during early Oligocene to early Miocene that dominated and affected the deposition and distribution of the sand. In the Zhuhai Formation, owing to the influence of the activity of the Zhu Ⅲ south fault, the region received fan-deltaic deposits proximate to the Shenhu uplift. The activity of the fault and the diversity of the parent rocks controlled the advancing range of the point sediment sources and the distribution pattern of the delta-fan. Moreover, the front of the fan suffered from the alternation of destruction and reconstruction may keep both the characteristics of river and tide. In the Zhujiang Formation, with the gradually rising of the sea level, there developed flooding tidal deltas in the relatively restricted barrier bar-lagoon system. Tidal passages were located at the lowland area on the middle northern Shenhu uplift. Because of the scouring of the current moving back and forth, multi-period of superimposition of tidal sand-bars is observed. For study of the distribution of the linear sand-bars, micro-palaeogeomorphology research in combination with integrated well-seismic data interpretation is recommended.
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Key words:
- tidal action /
- fan-delta /
- flood tidal delta /
- Pearl River Mouth Basin /
- Zhuhai Formation /
- Zhujiang Formation
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