玛西斜坡侏罗系八道湾组油气成藏特征及勘探方向  

Characteristics of hydrocarbon accumulation in the Jurassic Badaowan Formation of Maxi slope and its exploration direction

作　　者：钱海涛[1] 余兴[1] 魏云 张全[1] QIAN Haitao;YU Xing;WEI Yun;ZHANG Quan(Research Institute of Exploration and Development,Xinjiang Oilfield Company,PetroChina,Karamay,Xinjiang,834000,China;Research Institute of Experiment and Detection,Xinjiang Oilfield Company,PetroChina,Karamay,Xinjiang,834000,China)

机构地区：[1]中国石油新疆油田分公司勘探开发研究院,新疆克拉玛依834000 [2]中国石油新疆油田分公司实验检测研究院,新疆克拉玛依834000

出　　处：《油气地质与采收率》2018年第5期32-38,共7页Petroleum Geology and Recovery Efficiency

基　　金：国家科技重大专项"准噶尔盆地岩性地层油气藏富集规律与目标评价"(2017ZX05001-004);"准噶尔盆地致密油形成条件;资源潜力及有利区优选"(2016ZX05046-006-004)

摘　　要：玛西斜坡AH12井在侏罗系八道湾组首获高产工业油流,开辟了玛西斜坡油气勘探新领域。该区八道湾组成藏条件、油气富集规律及油水关系认识不清,导致后期部署多口预探井均告失利。综合运用地质、地震及分析化验等资料,对油气藏类型、成藏特征及模式进行研究,并指出有利勘探方向。结果表明:八道湾组油气主要来自二叠系风城组烃源岩;八道湾组一段一砂组辫状河三角洲水下分流河道优质砂体与上部湖泛泥岩形成良好的储盖组合;海西—印支与印支—燕山2期高角度断裂构成直通源型和接力型2类高效输导体系。研究区油藏类型为断块和断层-岩性油藏,受继承性鼻状构造、岩相及断裂与砂体的有效配置等因素控制,具有"烃源岩供烃、断裂跨层输导、鼻凸聚集、断裂岩性控藏"的成藏模式。该区中浅层油气勘探应以构造背景为基础,寻找有效输导断裂为重点,围绕鼻凸带进行勘探,克拉玛依组、八道湾组及三工河组湖泛泥岩之下储层为油气勘探的有利方向。High production of industrial oil and gas has been obtained in Well AH12 for the first time,which opens a new exploration field in high-efficiency reservoirs in Maxi slope.The hydrocarbon accumulation conditions and rules in the Badaowan Formation of Maxi slope are unclear,and the oil and water relations are complex,resulting in the failure of sever-al exploratory wells.A large amount of data of geology,seismic,engineering and laboratory test were comprehensively ap-plied to analyze the reservoir type,accumulation characteristics and patterns of reservoirs in the Badaowan Formation,and the exploration directions were pointed out.The results show that the oil and gas of the Badaowan Formation were mainly migrated from the source rock in the Permian Fengcheng Formation.The high-quality sand bodies of subaqueous distribu-tary channel in the braided river delta of the first member of Badaowan Formation are favorable reservoirs;while the top la-custrine mudstones of the formation act as the cap rock.On this basis,a favorable reservoir-seal assemblage was formed.Two types of high-effective carrier system,the straight-through type and the relay type,were built at the high angle faults that formed during the Hercynian-Indosinian and the Indosinian-Yanshan periods.The oil reservoir types in the study area are fault-block type and fault-lithologic type,which are controlled by inherited nosing structure,lithofacies and effective layouts of faults and sand bodies.The model of hydrocarbon reservoir formation is characterized by“source rock supplying hydrocarbon,faults providing migration paths through strata,hydrocarbon accumulation in nosing structure and faults and lithology controlling reservoirs”.The middle-shallow layer hydrocarbon exploration should be based on the structural back-ground,and more attention should be paid on effective oil-migrating faults and zones of fault nose and uplift.Reservoirs which are covered by the flooding shale in the Karamay,Badaowan and Sangonghe Formation are the most favorable zone.

关 键 词：成藏特征 成藏模式 勘探方向 玛西斜坡 八道湾组 

分 类 号：TE122[石油与天然气工程—油气勘探]