珠江口盆地惠州凹陷复合岩浆岩潜山储层发育机制  

Development Mechanism of Composite Igneous Rock Buried⁃Hill Reservoir in Huizhou Sag,the Pearl River Mouth Basin

作　　者：彭光荣 陈淑慧 李洪博 吴哲 杨雪 高翔 王菲 Peng Guangrong;Chen Shuhui;Li Hongbo;Wu Zhe;Yang Xue;Gao Xiang;Wang Fei(Shenzhen Branch,CNOOC China Ltd.,Shenzhen 518054,China;CNOOC Deepwater Development Ltd.,Shenzhen 518054,China)

机构地区：[1]中海石油(中国)有限公司深圳分公司,广东深圳518054 [2]中海石油深海开发有限公司,广东深圳518054

出　　处：《地球科学》2025年第2期419-432,共14页Earth Science

基　　金：中海石油(中国)有限公司“十四五”科技攻关项目“中国近海新区新领域勘探技术”(No.KJGG2022-0302);中海石油深海开发有限公司前瞻基础研究项目《南海东部前新生代石油地质条件及勘探潜力》(No.KJQZ-2024-2004);南海东部石油研究院科技自主攻关“揭榜挂帅”项目《珠江口盆地古潜山勘探潜力、评价技术及实践》.

摘　　要：珠江口盆地惠州凹陷复合岩浆岩潜山经历燕山期−喜山期多期构造演化成山过程,发育裂缝-溶蚀型储层,为了解潜山储层发育机制,利用锆石U-Pb定年、铸体薄片观察对惠州26-6潜山储层裂缝成因和期次及成岩演化过程开展了精细研究,明确了惠州26-6复合岩浆岩潜山储层发育机制.惠州26-6潜山岩性为花岗岩、闪长岩、玄武安山岩,至少经历6期构造−岩浆活动.花岗岩发生碎裂岩化,闪长岩与玄武安山岩出现片岩化.166~145 Ma玄武质火山岩喷发;145~134 Ma受燕山中期构造运动影响发生区域变质作用导致片岩化、片麻岩化,形成早期裂缝;~134 Ma、120~110 Ma伴随伸展作用有两期酸性岩浆侵入玄武质火山岩,发育花岗岩岩脉、硅质岩脉和碳酸盐岩脉,火山通道处发生阳起石化,伴随绿帘石化和绿泥石化;110~100 Ma之间发育一期张裂隙,102~87 Ma有岩浆热液上涌,裂缝中半充填白云石、浊沸石等;受晚白垩世构造转换作用影响区域大规模隆升,风化作用强烈,风化裂缝和溶蚀缝发育;裂陷期受珠琼一幕和珠琼二幕运动影响,有两期岩浆热液活动,裂缝中充填绿泥石、浊沸石等;南海运动和新构造运动时期产生微裂缝沟通烃源岩,有机酸进入对储层进一步溶蚀改造,裂缝未充填或半充填,13~5 Ma油气大规模充注,油气成藏.该研究为综合评价研究区储层特征、明确天然气富集规律提供了依据.The composite igneous rock buried hill in Huizhou Sag of the Pearl River Mouth Basin,experienced multi-stage tectonic evolution from Yanshanian to Himalayan,and developed fracture dissolution type reservoirs.In order to clarify the mechanism of buried hill reservoirs,the author conducted a detailed study on the fracture cause,phase and diagenetic evolution of Huizhou 26-6 buried-hill reservoir with zircon U-Pb dating and casting thin section observation.Huizhou 26-6 buried-hill is composed of granite,diorite and basaltic andesite,which have undergone at least six stages of tectonic magmatic activity.Granites suffered cataclastic,diorite and basaltic andesite are schistotized.At 166 to 145 Ma,basaltic volcanic rocks erupted.At 145 to 134 Ma,regional metamorphism occurred under the influence of the mid-Yanshan tectonic movement,resulting in gneissic and gneissic mineralization of basaltic volcanic rocksand early fractures.At~134 Ma and 120 to 110 Ma,acidic magma invaded of basaltic volcanic rocks in two stages with extension,and granite,siliceous and carbonate veins developed.Actinization,epidotization and chlorite occurred at the volcanic passage.A first phase of tensile fissure developed between 110 and 100 Ma,and magmatic hydrothermal upwelling between 102 and 87 Ma,and the fissure was half-filled with dolomite and turbidite.Large scale uplift of the area affected by Late Cretaceous tectonic transfor Mation,strong weathering,and developed weathering cracks and dissolution cracks;During the rifting period,there were two periods of Mag Matic hydrother Mal activity influenced by the movements of the first and second episodes of Zhuqiong,and the cracks were filled with chlorite and turbidite;During the South China Sea Movement and neotectonics,micro fractures were generated to connect Source rock.Organic acids entered the reservoir for further dissolution and transfor Mation.The fractures were not filled or half filled.Large scale oil and gas filling and accumulation took place at 5 to 13 Ma.This study provides a ba

关 键 词：复合岩浆岩 潜山 储层发育机制 惠州凹陷 珠江口盆地 石油地质 

分 类 号：P624[天文地球—地质矿产勘探]