摘要
琼东南盆地上中新统黄流组—上新统莺歌海组已发现多个大中型油气田,然而多年的滚动开发证实上述层系勘探潜力逐步呈下降趋势,亟需寻找有利接替层位和勘探区块。梅山组是琼东南盆地有利接替层位的首选层位,以琼东南盆地北部梅山组浊积扇体为目标靶区,通过岩石薄片观察、激光粒度、重矿物分析、微量元素/稀土元素等测试分析手段,结合沉积背景资料、盆地北部周缘水系及其岩石学特征,综合开展砂体组分、结构特征以及物源体系分析。结果表明:琼东南盆地北部梅山组低位时期剥蚀区范围较大,物源供应充足,陆坡边缘整体发育大范围的海底扇沉积,浊积扇砂体发育整体具有“西好东差”的沉积格局,其中盆地北部梅山组物源体系表现为“多点供源+地貌约束”的古地理格局。其中,海南岛宁远河物源影响琼东南盆地中央坳陷北部梅山组乐东凹陷、崖南凹陷和崖城凸起,为近源供给的海底扇沉积;海南岛陵水河物源远源供给琼东南盆地中央坳陷北部梅山组陵水凹陷和松南—宝岛凹陷;海南岛陵水河、万泉河双物源共同影响琼东南盆地中央坳陷北部梅山组松涛凸起以及松南—宝岛凹陷的东北部。西部红河和越南东部两大物源体系对乐东凹陷井区梅山组有区域影响。
A number of large and medium-sized oil and gas fields have been found from the Upper Miocene Huangliu Formation to the Pliocene Yinggehai Formation in the Qiongdongnan Basin.Several years of rolling development have confirmed that the exploration potential of the above strata is gradually declining.Therefore,it is urgent to find favorable replacing layers and exploration blocks in Qiongdongnan Basin,and the Meishan Formation is the preferred layer for favorable replacing layers.This paper takes the turbidite fan of Meishan Formation in the northern Qiongdongnan Basin as the target area.The sand body composition,structural characteristics and source system were analyzed by using rock thin section observation,laser particle size and heavy mineral analysis,trace element/rare earth element test in combination with the analysis of sedimentary background data,surrounding water system of the northern basin,and its rock characteristics.The results show that there is a large denudation area of Meishan Formation in the northern part of Qiongdongnan Basin,and the source supply is sufficient.A wide range of submarine fan deposits are developed on the edge of the continental slope with a sedimentary pattern of good in the west and poor in the east.The source system of Meishan Formation in the northern part of the basin is characterized by a paleogeographic pattern of“multi-point source and geomorphological constraints”.Among them,the Ningyuan River provenance of Hainan Island affects the Ledong Sag,Yanan Sag and Yacheng Uplift of Meishan Formation in the northern part of the Central Depression of Qiongdongnan Basin,which is a near-source supply of submarine fan deposits.The Lingshui River provenance of Hainan Island supplies to the Lingshui Sag and Songnan-Baodao Sag of Meishan Formation in the northern part of the central depression of Qiongdongnan Basin.The dual sources of Lingshui River and Wanquan River in Hainan Island jointly affect the uplift of Meishan Formation in the northern Central Depression of Qiongdongnan Basin and the northeast of Songnan-Baodao Sag.Two major source systems of Honghe River in the west and eastern Vietnam have regional influence on Meishan Formation in the well area of Ledong Sag.
作者
闫琢玉
李建平
龚胜利
李百强
王诗琪
彭俊峰
刘景环
张东峰
郑磊
崔书姮
YAN Zhuoyu;LI Jianping;GONG Shengli;LI Baiqiang;WANG Shiqi;PENG Junfeng;LIU Jinghuan;ZHANG Dongfeng;ZHENG Lei;CUI Shuheng(CNOOC Energy Development Co.,Ltd.Engineering Technology Company,Tianjin 300450,China;Guangdong Province Offshore High Temperature and High Pressure Oil and Gas Reservoir Exploration and Development Enterprise Key Laboratory,Zhanjiang 524057,China;Faculty of Earth Science,China University of Geosciences,Wuhan 430074,China;State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Wuhan 430074,China;CNOOC Research Institute Co.Ltd.,Beijing 100028,China;School of Earth and Environment,Anhui University of Science and Technology,Huainan 232001,China)
出处
《天然气地球科学》
CAS
CSCD
北大核心
2023年第12期2087-2100,共14页
Natural Gas Geoscience
基金
中海石油(中国)有限公司科研项目“琼东南盆地梅山组有效浊积储集体主控因素及储层预测技术”(编号:YXKY-ZX032021)
安徽理工大学高层次引进人才科研启动基金资助(编号:2023yjrc81)资助.
关键词
梅山组
物源体系
浊积扇
海南岛
琼东南盆地
Meishan Formation
Provenance system
Turbidity fan
Hainan island
Qiongdongnan Basin
作者简介
闫琢玉(1991-),男,陕西商洛人,在读硕士,工程师,主要从事油气田储层微观评价及勘探开发综合研究.E-mail:yanzhy3@cnooc.com.cn.
