珠江口盆地番禺天然气区东南缘坡折带韩江组中段沉积层序与岩性地层圈闭研究

综合利用钻井、测井、地震等资料，运用层序地层学原理，在珠江口盆地番禺天然气区东南缘陆架坡折带珠江组－韩江组层序地层格架划分的基础上，重点对韩江组中段SQhj₂的沉积层序特征进行了分析研究。SQh_j2层序可划分出低位、海侵及高位体系域，其中低位体系域依据地震、测井等特征可识别出明显的两期。在阐明层序结构和沉积体系域构成特征的基础上，建立了研究区SQhj₂的沉积层序模式，在此基础上，对研究区有利储集砂体和岩性地层圈闭分布进行了预测。

Sedimentary Sequence and Lithologic-stratigraphic Trap of the Middle Segment of Hanjiang Formation in the Shelf Break Zone in Southeast Panyu Natural Gas Area,Pearl River Mouth Basin

On the  basis of previous studies on the sequence stratigraphic framework of Zhujiang-HanJiang Formtation in the shelf break zone in southeast Panyu natural gas area, Pearl River Mouth Basin, and comprehensively using well drilling, logging and seismic data and sequence stratigraphic principles, the characteristics of sedimentary sequence  for SQhj₂ of the middle segment of Hanjiang Formation was studied.It was divided into lowstand system tract, transgressive system tract and highstand system tract, and the lowstand system tract can be recognized as two stages（two fourth order cycles）-the early and late stage lowstand system tract. The sequence structure and depositional system tract has the feature of four-layer architecture. From up to down, the SQhj₂ can be divided into transgressive system tract ,highstand system tract, the early and late stage lowstand system tract in the seismic section. On the basis of the constitutive characteristics of the sequence structure and depositional system tract was demonstrated, SQhj₂ sedimentary sequence model was established. In this model, under the sequence boundary of SB13.8, the late highstand system tract of SQhj₁ developed the falling stage system tract. And above the SB13.8,the sequence of SQhj₂ developed the early and late stage lowstand system tract under the shelf break. The favorable zones of the study area were predicted, and the sand body of lowstand system tract controlled by the paleo uplift and the shelf break is the favorable reservoir sand body and the distribution area of the lithologic and stratigraphic trap.