深层—超深层走滑断裂带储层流体来源与油气成藏过程研究——以塔里木盆地富满油田为例  

Study on reservoir fluid source and hydrocarbon accumulation process in deep to ultra-deep strike-slip fault zone:A case study of Fuman Oilfield,Tarim Basin

作　　者：薛一帆 文志刚[1] 黄亚浩 张银涛[2] 乔占峰 张天付 李梦勤 王彭[2] XUE Yifan;WEN Zhigang;HUANG Yahao;ZHANG Yintao;QIAO Zhanfeng;ZHANG Tianfu;LI Mengqin;WANG Peng(Hubei Key Laboratory of Petroleum Geochemistry and Environment,Yangtze University,Wuhan,Hubei 430100,China;Research Institute of Exploration and Development,Tarim Oilfield Company,PetroChina,Korla,Xinjiang 841000,China;PetroChina Hangzhou Research Institute of Geology,Hangzhou,Zhejiang 310023,China)

机构地区：[1]长江大学油气地球化学与环境湖北省重点实验室,湖北武汉430100 [2]中国石油塔里木油田分公司勘探开发研究院,新疆库尔勒841000 [3]中国石油杭州地质研究院,浙江杭州310023

出　　处：《油气藏评价与开发》2024年第4期549-559,共11页Petroleum Reservoir Evaluation and Development

基　　金：国家自然科学基金项目“深层碳酸盐岩储层流体活动示踪油气差异成藏效应研究——以塔里木盆地富满油田为例”(42302154);中国石油碳酸盐岩储层重点实验室开放基金项目“深层走滑断裂带储层流体活动差异性及对油气成藏响应研究——以塔里木盆地富满地区为例”(RIPED-2022-JS-2382)。

摘　　要：以富满油田北部走滑断裂带深部储层孔洞缝充填脉体为研究对象,基于脉体的岩相学特征、微区稀土元素和Sr(锶)同位素、油包裹体荧光光谱、显微热力学和碳酸盐岩U-Pb同位素定年进行分析。结果表明:富满油田北部走滑断裂带发育2期方解石脉体,脉体来源于中下奥陶统海源地层水,未见氧化性流体侵入,表明深层—超深层油气晚期具有良好的封闭性。通过包裹体测温投点埋藏史结合碳酸盐岩低U-Pb同位素定年技术,厘定塔里木盆地富满油田北部走滑断裂带深层奥陶系存在3期油气充注过程,分别对应于距今(459±7.2)Ma(加里东中期)、(348±18)Ma(海西早期)和268Ma(海西晚期),富满油田北部深层—超深层碳酸盐岩油气成藏关键期为海西早期,且油气充注与断裂活动有较好的对应关系。The study of the filling veins in deep reservoirs within the strike-slip fault zone in the north of Fuman Oilfield utilizes a range of methods including petrographic characteristics,analysis of rare earth elements and Sr(strontium)isotopes,fluorescence spectra of oil inclusions,microscopic thermodynamics,and U-Pb isotopic dating of carbonate rocks.The findings reveal two stages of calcite vein formation in this area.These veins originate from the formation water of the middle and Lower Ordovician sources,with no evidence of oxidizing fluid intrusion,suggesting that the deep to ultra-deep oil and gas reserves have maintained good sealing properties in later stages.Furthermore,based on the burial history deduced from inclusions and low U-Pb isotope dates from carbonate rocks,it has been determined that there are three distinct stages of hydrocarbon charging in the deep Ordovician strata of the northern strike-slip fault zone in the Tarim Basin.These stages correspond to(459±7.2)Ma(middle Caledonian),(348±18)Ma(early Hercynian),and 268 Ma(late Hercynian).It is noted that the early Hercynian period was the key phase for hydrocarbon accumulation in the deep and ultra-deep carbonate rocks in the north of Fuman Oilfield,with a significant correlation observed between oil and gas charging and fault activity.

关 键 词：塔里木盆地 富满油田 油气成藏 流体包裹体 U-PB同位素定年 流体演化 

分 类 号：TE122[石油与天然气工程—油气勘探]