CAJ | 학술논문

依据地震沉积学和层序地层学基本原理，对珠江口盆地惠州凹陷珠江组上段MFS18．5-SB17．5地层（ K层系）进行了高精度层序地层格架划分，共划分出8个砂层或砂层组。通过以层序界面、最大海泛面及次一级海泛面作为约束条件提取地层切片的研究方法，结合钻/测井、岩心和区域沉积背景，在研究区开展精细的地震相和沉积相研究。惠州凹陷珠江组K系列地层主要分布两大沉积体系，西侧为三角洲前缘河口坝-席状砂沉积体系和东南侧为陆架砂脊沉积体系，其中陆架砂脊主要具备以下几个特点：（1）分布在三角洲朵体前端；（2）平行于岸线呈NEE方向，且为条带状展布；（3）向两翼减薄，部分砂脊一翼较厚并具有尖锐边缘，另一翼逐渐变薄，并具有不规则边缘。探讨了这些在陆架上沉积的条带状砂脊成因的机制，指出这些平行于岸线的指状砂脊是三角洲前缘砂受波浪搬运和改造的产物，其在侧向相变为泥岩，是地层岩性油气藏勘探的一个重要领域。
의거지진침적학화층서지층학기본원리，대주강구분지혜주요함주강조상단MFS18．5-SB17．5지층（ K층계）진행료고정도층서지층격가화분，공화분출8개사층혹사층조。통과이층서계면、최대해범면급차일급해범면작위약속조건제취지층절편적연구방법，결합찬/측정、암심화구역침적배경，재연구구개전정세적지진상화침적상연구。혜주요함주강조K계렬지층주요분포량대침적체계，서측위삼각주전연하구패-석상사침적체계화동남측위륙가사척침적체계，기중륙가사척주요구비이하궤개특점：（1）분포재삼각주타체전단；（2）평행우안선정NEE방향，차위조대상전포；（3）향량익감박，부분사척일익교후병구유첨예변연，령일익축점변박，병구유불규칙변연。탐토료저사재륙가상침적적조대상사척성인적궤제，지출저사평행우안선적지상사척시삼각주전연사수파랑반운화개조적산물，기재측향상변위니암，시지층암성유기장감탐적일개중요영역。
Based on the principles of seismic sedimentology and sequence stratigraphy ,a high resolution sequence stratig-raphy framework was established for the MFS 18.5-SB17.5 ( K set ) in Huizhou sag of Pearl River Mouth Basin with 8 sand layers or sand groups recognized .Based on the time-slices of seismic attributes under the constraint of sequence boundary surface,maximum flooding surface and the sub-flooding surface,we studied in detail the seismic facies and sedimentary facies in combination with the well logging and drilling data , cores and regional sedimentary backgrounds . Two depositional systems were recognized in K set of Zhujiang Formation in Huizhou sag ,namely the river mouth bar of delta front-sheet sand depositional system in the west ,and the shelf ridges system in the southeast .The shelf ridges are characterized by the follows:being located in the front of delta lobes;parallel to the coast in NEE direction , and in stripped distribution;and thinning towards to both edges .Some ridges are thick in one limb and having sharp edges ,while the other limb thinning gradually and having irregular edges .This paper discussed the formation mechanism of those striped ridges on the shelf ,and pointed out that the striped ridges were resulted from transportation and transformation of delta front sands by waves .And they laterally change into mudstone ,thus are important domains for exploration of lighologic reservoirs .