阿尔伯特盆地沉降-热史演化特征分析  

Analysis on subsidence-thermal history evolution characteristics of Albert basin

作　　者：孙和风 姜雪 钟锴 SUN Hefeng;JIANG Xue;ZHONG Kai(CNOOC International Limited,Beijing 100027,China;CNOOC Research Institute Co.,Ltd.,Beijing 100028,China;State Key Laboratory of Marine Geology,Tongji University,Shanghai 200092,China;Marine Resources Research Center,Tongji University,Shanghai 200092,China)

机构地区：[1]中国海洋石油国际有限公司,北京100027 [2]中海油研究总院有限责任公司,北京100028 [3]同济大学海洋地质国家重点实验室,上海200092 [4]同济大学海洋资源研究中心,上海200092

出　　处：《中国海上油气》2018年第5期63-70,共8页China Offshore Oil and Gas

基　　金："十三五"国家科技重大专项"非洲重点区油气勘探潜力综合评价(编号:2017ZX05032-002)"部分研究成果

摘　　要：阿尔伯特盆地是陆内新生裂谷盆地,盆地沉降史、热史等演化过程尚不明确。利用最新的钻井、地震等资料,分析了阿尔伯特盆地的沉降-热史演化特征,并结合区域深部应力、裂谷肩响应等特征,进一步探讨了盆地演化模式。分析表明,阿尔伯特盆地具有两期裂陷幕式旋回,其中裂陷Ⅰ期(17.00～7.246 Ma)具有沉降速率较低、热流值中等、缺少火山活动的特点;裂陷Ⅱ期(7.246 Ma至今)盆地演化呈沉降速率高、热流值的快速增加并差异演化、裂谷肩快速隆升、局部火山活动活跃的特征。阿尔伯特盆地沉降-热史演化特征影响了储集层和烃源岩分布,储集层发育于裂陷Ⅰ期晚期,盆地内已钻遇的区域性烃源岩发育于裂陷Ⅱ期早期。阿尔伯特盆地沉降-热史演化特征对东非裂谷系西支区域油气勘探具有一定的参考意义。The Albert basin is an intracontinental rift basin with unclear basin subsidence history and thermal history,etc..Based on the latest drilling and seismic data,the subsidence-thermal history evolution characteristics of the Albert basin were analyzed.Combined with characteristics of regional deep stress and rift shoulder response,the basin evolution model was further explored.The analysis shows that the Albert basin experienced a two-stage rifting episodic cycle,in which the rifting stage I(17.00~7.246 Ma)has the characteristics of low sedimentation rate,medium heat flow value and weak volcanic activity;the rifting stage II(7.246 Ma up to now)exhibits the basin evolution characteristics of high sedimentation rate,rapidly increasing heat flow value and differential evolution,fast uplifting of rift shoulder,and active local volcanic activity.The subsidence-thermal history evolution characteristics of the Albert basin affected the distribution of reservoirs and source rocks.The reservoirs were developed in the late rifting stage I,and the regional source rocks that have been drilled in the basin were developed in the early rifting stage II.The subsidence-thermal history evolution characteristics of the Albert basin will provide reference for oil and gas exploration in the western branch of the East African rift system.

关 键 词：阿尔伯特盆地 沉降-热史演化 深部地壳活动 裂谷肩响应 

分 类 号：TE121.2[石油与天然气工程—油气勘探]