琼东南盆地中央坳陷西北部梅山组浊积扇源-汇分析  

Source-to-sink system analysis of the Meishan Formation turbidite fans in the northwest of the central depression in Q iongdongnan basin

作　　者：李建平 闫琢玉 徐微 刘景环 LI Jianping;YAN Zhuoyu;XU Wei;LIU Jinghuan(CNOOC Research Institute Ltd.,Beijing 100028,China;CNOOC EnerTech Drilling&Production Co.,Zhanjiang,Guangdong 524057,China)

机构地区：[1]中海油研究总院有限责任公司,北京100028 [2]中海油能源发展股份有限公司工程技术湛江分公司,广东湛江524057

出　　处：《中国海上油气》2023年第3期53-67,共15页China Offshore Oil and Gas

基　　金：中海石油(中国)有限公司综合科研项目“琼东南盆地中新统梅山组有效浊积储集体主控因素及储层预测技术(编号:YXKY-ZX 03 2021)”部分研究成果。

摘　　要：琼东南盆地中央峡谷中新统黄流组—上新统莺歌海组已发现陵水17-2等大中型气田,但对中—深层梅山组勘探尚未取得重大突破,梅山组砂体展布不清制约了油气勘探。以盆地中央坳陷西北部梅山组浊积扇砂岩为解剖对象,采用微观薄片观察、岩矿组分统计和同位素测试,结合宏观构造演化和河道发育刻画,对“源-汇”系统要素和控砂机制进行了分析。结果表明:(1)YC35-X浊积扇区是海南岛、越南中部和红河多物源供给,沿红河断裂带、1号断裂和多期河道,NW至SE向搬运和沉积;(2)YC24-X和LS13-X井浊积扇区是海南岛物源供给,经5号、3号和2号断裂和多期河道,NNW至SSE向搬运和沉积;(3)ST36-X井浊积扇区为海南岛不同分支物源,经5号、6号和2号断裂和多期河道,NE至SW向搬运和沉积。琼东南盆地中央坳陷西北部梅山组源-汇系统总体受海南岛物源绝对控制,表现为海南岛、红河和越南中部等多物源供给格局、沿继承性活动断裂和多期发育的河道汇聚、沉积在海底扇底部。YC35-X和ST36-X浊积扇区东北向是盆地中央坳陷西北部梅山组较为有利浊积砂体发育区带。Large and medium-sized gas fields such as the LS17-2 have been discovered in the Miocene Huangliu Formation to Pliocene Yinggehai Formation in the central canyon of Qiongdngnan basin.However,no significant breakthrough has been made in the exploration of the mid-deep Meishan Formation so far and the unclear distribution of the Meishan Formation sand bodies has restricted oil and gas exploration.This paper focuses on the turbidite fan sandstone of the Meishan Formation in the northwest of the central depression in Qiongdngnan basin and analyzes the elements of the source-to-sink system and sand-controlling mechanism through microscopic thin section observation,rock and mineral composition statistics and isotope test,and combining with the analysis of macro tectonic evolution and channel carving.The results reveal that:①The YC35-X turbidite fan was transported and deposited from NW to SE along the No.1 fault and multi-stage channels of the Honghe fault zone with multi-provenance supply from the Hainan Island,the central Vietnam and the Honghe River.②The YC24-X and LS13-X turbidite fan was transported and deposited from NNW to SSE along the No.5 fault,the No.3 fault,the No.2 fault and multi-stage channels with provenance supply from the Hainan Island.③The ST36-X turbidite fan was transported and deposited from NE to SW along the No.5 fault,the No.6 fault,the No.2 fault and multi-stage channels with different branches of provenance supply from the Hainan Island.The source-to-sink system of the Meishan Formation in the northwest of the central depression in Qiongdngnan basin is absolutely controlled by the provenance of the Hainan Island,which is characterized by multi-provenance supply from the Hainan Island,the Honghe River and the central Vietnam,converging along the inherited active-faults and multi-stage channels,and being deposited at the bottom of submarine fans.The northeast of YC35-X and ST36-X turbidite fan is a favorable zone for the development of turbidite sand bodies of the Meishan Formation in the

关 键 词：源-汇系统 岩矿组分分析 同位素测试 梅山组 浊积扇 琼东南盆地 

分 类 号：TE121.3[石油与天然气工程—油气勘探]