【摘要】 鹤山凹陷发育于南海北部陆架边缘的洋陆过渡壳之上,对其研究尚处于初始阶段。通过二维地震资料的精细解释,综合分析了凹陷的结构特征、构造演化历史、古地貌和烃源岩特征。研究表明:根据凹陷结构特征,可将其划分为北部断陷区和南部断坳区2部分;构造演化可划分为4阶段,即陆缘断拗期、洋壳扩张期、洋壳停滞期和陆缘斜坡期;鹤山凹陷恩平组沉积期为较局限的沉积环境,有利于主力烃源岩的形成;珠海组沉积期,三角洲砂、泥岩及深水浊积扇砂、泥岩是有利储盖组合;差异沉降作用导致鹤山凹陷初次掀斜形成一系列近EW向断层,在鹤山凹陷北部形成背斜型和断背斜型圈闭,是有利的勘探区带。更多还原

【Abstract】 Heshan Sag was developed on the crust of ocean-crust transition zone on the margin of continental shelf in the north of South China Sea,its research was still at the initial stage.The structural characteristics,its evolution history,paleogeomorphology and source rocks were analyzed comprehensively based on the 2D seismic interpretation.Study shows that based on its structure,Heshan Sag can be divided into the north half-graben zone and south depression zone.The evolution history can be classified into four stages,that is,continental margin fault-depression stage,oceanic crust spreading stage,oceanic crust stagnation stage and continental margin slope stage.Deposit in the Enping Formation of Heshan Sag was a limited sedimentary environment,which was favorable for reservoir formation.During the sedimentary period of Zhuhai Formation,the sand-shale of delta and deepwater turbidite fan are the favorable reservoir-caprock assemblages.The favorable exploration area can be concluded as the anticline trap and fault anticline trap in the north Heshan Sag,the EW-trending faults are induced by differential subsidences during the spreading of Shuangfeng Basin(northwest sub-basin).更多还原