松辽盆地四方坨子地区上白垩统姚家组浅水三角洲实例分析  

Shallow water delta of Upper Cretaceous Yaojia Formation in Sifangtuozi area,Songliao Basin

作　　者：樊奇[1,2] 田继军 樊太亮 冯烁[3] 葛旭 成赛男 FAN Qi;TIAN Jijun;FAN Tailiang;FENG Shuo;GE Xu;CHENG Sainan(School of Energy,China University of Geosciences,Beijing 100083,China;Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Enrichment Mechanism,Ministry of Education,Beijing 100083,China;School of Geology and Mines,Xinjiang University,Urumqi 830047,China;Binnan Oil Production Plant,Shengli Oilfield Company,Sinopec,Dongying 256606,Shandong,China)

机构地区：[1]中国地质大学(北京)能源学院,北京100083 [2]海相储层演化与油气富集机理教育部重点实验室,北京100083 [3]新疆大学地质与矿业工程学院,乌鲁木齐830047 [4]中国石化胜利油田分公司滨南采油厂,山东东营256606

出　　处：《岩性油气藏》2018年第2期39-49,共11页Lithologic Reservoirs

基　　金：国家重大科技专项"松辽盆地南部岩性地层油气藏富集规律与区带目标优选评价"(编号:2011ZX05001002);中国石油科技专项"吉林探区第四次资源评价"(编号:2013E050203)联合资助

摘　　要：松辽盆地四方坨子地区是吉林油田近年提储增效的主力区块,但上白垩统姚家组勘探长期未获得突破。基于147口探井和300口开发井资料,重点结合25口井岩心观察,以岩石学特征、沉积构造分析和地震切片为手段,结合现代沉积分析,探讨了该区上白垩统姚家组浅水三角洲的形成背景、沉积特征和勘探潜力。结果表明,姚家组可划分为2个三级层序(SQY1与SQY2+3)和6个四级层序(RST)。姚家组沉积期,研究区古坡度小于3°、古水深小于20 m、干热的古气候与东部敞盆的古地理格局,促成发育浅水三角洲—滨浅湖—半深湖沉积体系。其浅水三角洲具备牵引流和"源近流短"的沉积特征,发育强水动力沉积构造,表现为毯式三角洲形态和叠瓦状加积地震反射。结合赣江和密西西比河三角洲实例认为,该区浅水三角洲发育的大规模湖盆中心薄层砂体,具有"平面长距离推进,垂向多期广覆式叠置"的特征,该认识对松辽盆地南部坳陷区隐蔽油气藏勘探具有参考价值。Sifangtuozi area is the key project for Jilin Oilfield to submit reserves and raise efficiency recently,but there is no breakthrough of Yaojia Formation due to the poor knowledge of scientific theories.Based on the data from 147 exploration wells and 300 development wells,focused on core observation from 25 coring wells,combined with petrological characteristics,sedimentary structures,seismic sections and modern sedimentary cases,the formations,sedimentary features and exploration prospects of the shallow water delta of Upper Cretaceous Yaojia Formation in Sifangtuozi area were analyzed.The result shows that Yaojia Formation can be divided into two third-order sequences(SQY1 and SQY2+3)and six fourth-order sequences(RST).In the sedimentary period of Yaojia Formation,the paleo-topography grade is less than 3°,the paleo-depth is less than 20 m,and the dry and hot paleoclimate and opening of eastern Songliao Basin,jointly contributed to the development of shallow delta and shallow to semi-deep lacustrine sedimentary system.Specifically,the natural traits of the shallow water delta comprising features of traction current and short distanced depositional process with near-provenance,with the development of enforced hydrodynamics structures,are presenting as blanket shaped morphological characteristics and imbricated aggradations seismic facies.Integrated the delta of the Ganjiang River and the Mississippi River with the studied case,it is concluded that the large scaled bed-like sand bodies developed in depositional center,are with the characteristics of horizontal long distance propulsion and vertical extensive overlap in multistage.The above knowledge will be helpful to the exploration of subtle reservoirs in southern Songliao Basin scientifically.

关 键 词：浅水三角洲 沉积特征 姚家组 松辽盆地 

分 类 号：TE121.3[石油与天然气工程—油气勘探]