琼东南盆地深水东区古近系碎屑岩储集体形成机制与展布特征  

Formation mechanism and distribution characteristics of Paleogene clastic rock reservoirs in eastern deep-water area of Qiongdongnan Basin

作　　者：罗威 林璐 焦祥燕 呙诗阳 胡雯燕 LUO Wei;LIN Lu;JIAO Xiangyan;GUO Shiyang;HU Wenyan(CNOOC China Limited,Hainan Branch,Haikou,Hainan 570312,China)

机构地区：[1]中海石油(中国)有限公司海南分公司,海南海口570312

出　　处：《中国海上油气》2025年第2期104-117,共14页China Offshore Oil and Gas

基　　金：国家自然科学基金企业创新发展联合基金重点支持项目“南海北部深水区深层温压场差异性演化对优质储层的控制机理(编号:U24B2016)”;中国海洋石油集团有限公司“十四五”重大科技项目“南海北部深水区勘探关键技术(编号:KJGG2022-0102)”;“十三五”国家科技重大专项子课题“莺琼盆地高温高压天然气富集规律与勘探开发关键技术(三期)(编号:2016ZX05024-005)”部分研究成果。

摘　　要：基于琼东南盆地深水东区的地震资料及钻井获取的岩性、电性、薄片与分析测试数据,开展了该区规模储集体类型、形成机制及分布特征的研究,以推动该区油气勘探取得新进展。研究表明:深水东区古近系规模碎屑岩储集体发育,可识别出三角洲和海底扇2种类型;继承性大物源区流域面积及转换带控制了三角洲的规模及位置,快速隆升小物源区构造隆升幅度及物源水系控制了三角洲的规模,输砂通道及多源汇聚背景控制了坳陷中央远源区大型海底扇的发育。明确崖三段、陵三段及陵二段、陵一段为深水东区规模碎屑岩储集体有利发育层段,其中崖三段沉积期以三角洲为主,中央坳陷北翼由西至东储集体规模呈先增大再缩小然后再稍微增大的趋势,坳陷南翼发育前、后两排三角洲,均可形成规模储集体;陵三段沉积期规模储集体也以三角洲为主,分布规律与崖三段较为相似;陵二段和陵一段沉积期坳陷两翼和中心以小型三角洲和海底扇为主,仅长昌凹陷受输砂通道及多源汇聚背景影响发育规模海底扇。基于上述三角洲和海底扇的时空展布差异,指明了深水东区不同区带的有利勘探层系。Based on the seismic data and the lithology,electricity,sections,and analytical test data obtained from drilling,the study investigated the types,formation mechanisms,and distribution characteristics of large-scale reservoirs in the eastern deep-water area of the Qiongdongnan Basin in the hope of promoting new progress in oil and gas exploration in this area.The results indicate that large-scale Paleogene clastic rock reservoirs are developed in the eastern deep-water area,and two types of delta and submarine fan can be identified.The delta scale and location are controlled by the watershed area and transfer zone in the inherited large provenance area,while the delta scale is controlled by the structural uplift amplitude and fluvial system in the small provenance area with rapid uplift.Additionally,the development of large submarine fans is controlled by the sand transport channel and multi-source convergence background in the depression center far from the source area.The third member of Yacheng Formation and Lingshui Formation and the second and first members of Lingshui Formation are favorable intervals for the development of large-scale clastic rock reservoirs in the eastern deep-water area.Deltas dominate during the sedimentation period of the third member of Yacheng Formation.The scale of the reservoirs in the northern wing of the central depression exhibits a trend of initially increasing,then decreasing,and finally slightly increasing again from west to east.Two rows of deltas develop in the front and back of the southern wing of the depression,both having capability of forming large-scale reservoirs.Similarly,during the sedimentation period of the third member of Lingshui Formation,large-scale reservoirs are predominantly dominated by deltas with distribution characteristics similar to those of the third member of Yacheng Formation.As for the second and first members of Lingshui Formation,small-scale deltas and submarine fans mainly compose both wings and center areas within depression,and only Changchan

关 键 词：琼东南盆地 中央坳陷 深水东区 古近系 规模储集体 三角洲 海底扇 

分 类 号：TE121[石油与天然气工程—油气勘探]