南苏丹Melut盆地北部地区中—新生界稠油成藏模式及勘探潜力  

Hydrocarbon accumulation models and exploration potential of Meso-Cenozoic heavy oil in northern Melut Basin,South Sudan

作　　者：薛罗[1] 史忠生[1] 马轮[1] 赵艳军 岳世俊[1] 洪亮[1] 王磊[1] 雷明[1] XUE Luo;SHI Zhongsheng;MA Lun;ZHAO Yanjun;YUE Shijun;HONG Liang;WANG Lei;LEI Ming(PetroChina Research Institute of Petroleum Exploration and Development-Northwest,Lanzhou 730020,China;China National Oil and Gas Exploration and Development Co.,Ltd.,CNODC,Beijing 100000,China)

机构地区：[1]中国石油勘探开发研究院西北分院,兰州730020 [2]中国石油国际勘探开发公司,北京100000

出　　处：《岩性油气藏》2023年第3期76-85,共10页Lithologic Reservoirs

基　　金：“十三五”中国石油重大科技项目“海外重点战略大区勘探技术研究与应用”(编号:2019D-4306)资助。

摘　　要：南苏丹Melut盆地北部地区发育多种类型的稠油油藏,勘探开发前景广阔。通过油源对比、油气运聚模拟,对Melut盆地北部地区中—新生界稠油油藏类型进行了划分,并分析了不同层系稠油油藏的成藏模式及主控因素。研究结果表明:①Melut盆地北部地区发育5种类型的稠油油藏,分别为新近系Jimidi组构造-岩性稠油油藏、古近系Yabus组断块稠油油藏和地层不整合稠油油藏、白垩系Galhak组上倾尖灭岩性稠油油藏、基岩潜山裂缝稠油油藏。②新近系Jimidi组稠油油藏成因为次生型,具有远源断层-不整合面运移的成藏特征,为构造-岩性油藏,Gandool,Dabass和Jammam等地区是有利的稠油聚集区。③古近系Yabus组稠油油藏为次生型成因,其中地层不整合稠油油藏勘探潜力有限,断块稠油油藏具有远源断层-砂体阶梯式运移的成藏特征,盆缘Jammam断阶带是稠油勘探的有利区带。④白垩系Galhak组地层-岩性稠油油藏为原生型成因,主要受控于近源未熟—低熟烃源岩,凹陷斜坡高部位辫状河三角洲前缘是地层-岩性稠油油藏发育的主要相带。There are various types of heavy oil reservoirs developed in northern Melut Basin,with broad prospects for exploration and development.Through oil-source correlation and hydrocarbon migration and accumulation simulation,the Meso-Cenozoic heavy oil reservoirs in northern Melut Basin were classified,and the accumulation models and main controlling factors of different formations of heavy oil reservoirs were analyzed.The results show that:(1)There are five types of heavy oil reservoirs developed in northern Melut Basin,including structurallithologic heavy oil reservoirs of Neogene Jimidi Formation,fault-block heavy oil reservoirs and stratigraphic unconformity heavy oil reservoirs of Paleogene Yabus Formation,up-dip pinch-out lithologic heavy oil reservoirs of Cretaceous Galhak Formation and fracture heavy oil reservoirs in buried hill.(2)The heavy oil reservoirs of Neogene Jimidi Formation are of secondary origin,with the reservoir accumulation characteristics of far-source faultunconformity migration,which is a structural-lithologic reservoir.Gandool,Dabass and Jammam areas are favorable for heavy oil accumulation.(3)The heavy oil reservoirs of Paleogene Yabus Formation are of secondary origin,of which the stratigraphic unconformity heavy oil reservoirs have limited exploration potential,and the faultblock heavy oil reservoir have the accumulation characteristics of far source fault and sand body step migration.The Jammam fault-step belt in the basin margin is a favorable area for heavy oil exploration.(4)The stratigraphiclithologic heavy oil reservoirs of Cretaceous Galhak Formation are of primary origin,which are mainly controlled by near-source immature to low-mature hydrocarbon source rocks.Braided river delta front at the high part of the sag slope is the main facies belt for the development of stratigraphic-lithologic heavy oil reservoir.

关 键 词：稠油 成藏模式 勘探潜力 Jimidi组 Yabus组 Galhak组 中—新生代 Melut盆地 南苏丹 

分 类 号：TE122.1[石油与天然气工程—油气勘探] P618.13[天文地球—矿床学]