琼东南盆地永乐8区基底花岗岩潜山分带特征  

Zonation characteristics of the granite basement buried hill in Yongle 8 area of Q iongdongnan basin

作　　者：郭书生 陈现军 廖高龙 彭志春 GUO Shusheng;CHEN Xianjun;LIAO Gaolong;PENG Zhichun(CNOOC China Limited,Hainan Branch,Haikou,Hainan 570312,China;China France Bohai Geoservices Co.,Ltd.,Zhanjiang Branch,Zhanjiang,Guangdong 524057,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 [2]中法渤海地质服务有限公司湛江分公司,广东湛江524057

出　　处：《中国海上油气》2023年第3期68-76,共9页China Offshore Oil and Gas

基　　金：中国海洋石油有限公司“十四五”重大科技项目“海上深层/超深层油气勘探技术(编号:KJGG2022-0405)”部分研究成果。

摘　　要：琼东南盆地永乐8区基底花岗岩潜山钻遇优质气层,储层厚度大、产能高,显示了巨大的勘探潜力。但区内花岗岩潜山垂向分带特征仍不清楚,制约基底潜山油气的深入勘探。本文对该区已钻井的井壁心、岩石薄片、全岩X衍射结果及元素录井分析结果,在地质构造的约束下进行了综合研究,提出永乐8区基底花岗岩潜山垂向上自上而下主要发育风化裂缝带、裂缝破碎带和基岩带,且横向上具可对比性。生产实践表明,风化裂缝带和裂缝破碎带是主要的优质储层发育层段,两者厚度分别为13~56 m和107~158 m,这为后期油气测试层段聚焦提供了较为可靠的地质参考。The granite basement buried hill in Yongle 8 area of Qiongdongnan basin has confirmed great exploration potential in high quality gas reservoir with thick reservoir thickness and high productivity.However,the vertical zonation characteristics of the granite basement buried hill are not clearly recognized,which restricted further gas exploration.In this paper,a comprehensive study is made based on borehole core,rock section,whole rock X-ray diffraction and element log analysis results under the constraint of geological structure.It is clearly proposed that the basement granite in Yongle 8 area mainly develops weathering fracture zone,fracture crushed zone and bedrock zone vertically,which are comparable in transverse direction.The practical production data show that the weathering fracture zone and fracture crushed zone are favorable reservoir development zones.The thickness of the weathering fracture zone and fracture crushed zone is 13~56 m and 107~158 m respectively.The achievements provide a reliable geological basis for the selection of oil and gas test section in the further exploration.

关 键 词：琼东南盆地 永乐8区 花岗岩潜山 垂向分带 

分 类 号：TE122.2[石油与天然气工程—油气勘探]