阿曼山西侧前陆盆地莱克维尔隆起中—新生界构造特征与油气成藏  

Structural characteristics and hydrocarbon accumulationin Lekhwair Uplift of the foreland basin on the west sideof Oman Mountain, Middle East

作　　者：张宁宁[1] 姚根顺 王建君[1] 张庆春[1] 马红林 罗贝维[1] ZHANG Ningning;YAO Genshun;WANG Jianjun;ZHANG Qingchun;MA Honglin;LUO Beiwei

机构地区：[1]中国石油勘探开发研究院 [2]中国石油杭州地质研究院

出　　处：《海相油气地质》2023年第2期209-216,共8页Marine Origin Petroleum Geology

基　　金：中国石油集团前瞻性基础性科技项目“海外油气勘探项目资产评估与规划决策技术研究”(编号:2021DJ3106);“全球重点领域氦气资源评价及一体化评价技术研究”(编号:2021ZG1302)联合资助。

摘　　要：我国石油公司在中东阿曼山西侧前陆盆地莱克维尔隆起拥有多个油气合作项目,由于勘探程度较低,对其区域构造与油气成藏特征的认识还不够深入。基于新的井震资料,开展莱克维尔隆起区构造、断裂解释与油气成藏分析。结果表明:①莱克维尔隆起在三叠纪—侏罗纪处于拉张环境,晚白垩世构造发生反转形成反转背斜,其形成主要受控于阿曼山快速隆升挤压作用,上覆古近系直接披覆于隆起区中白垩统之上呈不整合接触。②隆起区发育两组高角度正断层,断层形态在剖面上呈“Y”形、复合“Y”形,在平面上呈“X”形交叉分布;晚白垩世由于造山作用导致断层处于挤压状态。③研究区中生代长期处于被动陆缘,具有3类典型成藏模式,包括下白垩统Shuaiba组礁滩岩性油气藏、上白垩统Natih组断块型油气藏及地层不整合油气藏、古近系Umm er Radhuma组生物碎屑灰岩岩性油气藏;晚白垩世以来上侏罗统Diyab组、下白垩统Bab组2套主力烃源岩已进入成熟阶段,晚白垩世发育的不整合及三叠纪—侏罗纪伸展背景下形成的垂向断裂构成重要的油气输导体系,促进了区域油气聚集成藏。认为莱克维尔隆起顶部、西侧斜坡带与东侧前渊斜坡带的地质条件相似,具有较大勘探潜力,是未来重要的油气勘探方向。China’s oil companies have several oil and gas cooperation projects in the east of Lekhwair Uplift of the foreland basin on the west side of Oman Mountain,Middle East.Due to the lower degree of regional exploration,the analysis of structure-faults and hydrocarbon accumulation was not deep enough,which restricts the regional exploration process.Based on the new well and seismic data,this paper carried out system structural interpretation and analysis of hydrocarbon accumulation.The results show that:(1)Once being in a regional tensile environment during Triassic-Jurassic,the Lekhwair Uplift is a reverse anticline developed in Late Cretaceous mainly under the control of the rapid uplift and compression of the Oman Mountain,and the overlying Paleogene is directly draped over the Middle Cretaceous in angular unconformity contact in the uplift area.(2)Two sets of high-angle normal faults developed in the uplift area,the different scale faults appear as Y-shape or composite Y-shape forming graben-horst structure on section,and as X-shape distribution in the plane.In Late Cretaceous,these faults are in a closed state due to the orogenic compression.(3)This region was in the passive continental margin for a long time in the Mesozoic era,and the temporal-spatial configuration of source,reservoir and cap is good.The study area has three typical reservoir forming models,namely,the Lower Cretaceous Shuaiba reef-shoal lithologic reservoir,the Upper Cretaceous Natih fault-block reservoir and stratigraphic unconformity reservoir,and the Paleogene Umm er Radhuma bioclastic limestone reservoir.The two sets of main source rock,Diyab Formation of Upper Jurassic and Bab Formation of Lower Cretaceous,have entered a mature stage since Late Cretaceous,then unconformity and vertical faults constitute an important oil and gas conducting system in the region,promoting regional oil and gas accumulation.It is believed that the top and west slope of Lekhwair Uplift have similar geological conditions with those in the east,so they have larg

关 键 词：构造特征 油气成藏 勘探潜力 前陆盆地 莱克维尔隆起 阿曼山 

分 类 号：TE122.1[石油与天然气工程—油气勘探]