准噶尔盆地沙湾凹陷二叠系风城组油气地质特征、成藏模式及上超削蚀带勘探实践  

Hydrocarbon geological characteristics and accumulation model of Permian Fengcheng Formation,and exploration practice of onlap-truncation belt in Shawan sag,Junggar Basin

作　　者：董雪梅 李静[2] 胡婷婷[1] 李静 吴晨骁 张洁[2] 陈亮 Dong Xuemei;Li Jing;Hu Tingting;Li Jing;Wu Chenxiao;Zhang Jie;Chen Liang(Research Institute of Exploration and Development,PetroChina Xinjiang Oilfield Company,Xinjiang Urumqi 830013,China;Research Center of Shawan Sag,Institute of Geophysics,Research Institute of Exploration and Development,PetroChina Xinjiang Oilfield Company,Xinjiang Urumqi 830013,China;Research Center of the Southern Margin of Junggar Basin,Institute of Geophysics,Institute of Exploration and Development,PetroChina Xinjiang Oilfield Company,Xinjiang Urumqi 830013,China)

机构地区：[1]中国石油新疆油田公司勘探开发研究院,新疆乌鲁木齐830013 [2]中国石油新疆油田公司勘探开发研究院地球物理研究所沙湾凹陷研究中心,新疆乌鲁木齐830013 [3]中国石油新疆油田公司勘探开发研究院地球物理研究所准南研究中心,新疆乌鲁木齐830013

出　　处：《石油学报》2023年第3期420-432,共13页Acta Petrolei Sinica

基　　金：中国石油天然气集团有限公司科技重大专项"准噶尔盆地岩性地层油气藏分布规律与目标评价"(2017ZX05001-004)资助。

摘　　要：准噶尔盆地沙湾凹陷二叠系呈现北浅南深、北窄南宽的"勺"状特征,自北向南划分为北部上超削蚀带(超削带)、中部鼻状隆起带(鼻隆带)和南部深凹带,其中,南部深凹带不仅地层发育齐全,而且地层迅速增厚,是沙湾凹陷的沉积中心和生烃中心。热演化模拟结果显示南部深凹带已达大规模生气阶段。沙湾凹陷二叠系内部发育2个二级不整合面,不整合面上下的佳木河组、风城组和上乌尔禾组为主力储集层。北部超削带发育源-储分离的常规油(气)藏、中部鼻隆带发育源-储相邻的超压致密凝析气藏、南部深凹带发育源-储一体深层页岩气藏。北部超削带风城组已整体成藏,其油气富集程度受沉积相带控制,发育扇三角洲前缘亚相分流河道粗砂—小砾岩优质储层,具备高产稳产的地质条件。沙湾凹陷二叠系油气成藏的动、静态配置条件优越,是准噶尔盆地未来10年轻质油和天然气勘探最重要的领域。The Permian of Shawan sag is spoon-shaped,shallow in the north and deep in the south,narrow in the north and wide in the south.From north to south,it can be divided into the northern onlap-truncation belt,the central nose-shaped uplift belt and the southern deep sag belt.The deep sag belt not only has well-developed strata,but also is rapidly thickened,which is the depocenter and hydrocarbon-generation center of the sag.According to the thermal evolution simulation results,large-scale gas generation occurred in the southern deep sag belt.Two second-order unconformities are developed in the Permian,and three sets of strata,i.e.,Jiamuhe Formation,Fengcheng Formation and Shangwuerhe Formation,developed above and below the unconformities are the main reservoirs in Shawan sag.The conventional oil(gas)reservoir characterized with source-reservoir separation are developed in the northern onlap-truncation belt,the overpressure tight condensate gas reservoirs characterized with source-reservoir contiguity are developed in the central nose-shaped uplift belt,and the deep shale gas reservoirs characterized with source-reservoir integration are developed in the southern deep sag belt.Fengcheng Formation in the northern onlap-truncation belt is the reservoir as a whole,and its oil and gas enrichment is controlled by sedimentary facies.The high-quality reservoirs of coarse sand and small conglomerate in the northern onlap-truncation belt are developed in the distributary channel of fan delta front subfacies,which can provide the geological conditions for high and stable hydrocarbon yield.In Shawan sag,the dynamic and static configuration conditions of Permian oil and gas accumulation are superior,so the sag will be the most important exploration field of light oil and natural gas in Junggar Basin in the next 10 years.

关 键 词：沙湾凹陷 二叠系 北部超削带 风城组 扇三角洲前缘 

分 类 号：TE122[石油与天然气工程—油气勘探]