准噶尔盆地车排子凸起沙湾组二段油气成藏特征及其主控因素  

Petroleum Accumulation Characteristics and the Main Controlling Factors of the Second Member of Shawan Formation in Chepaizi Uplift,Junggar Basin

作　　者：马立驰[1,2] 

机构地区：[1]中国石油大学(北京)地球科学学院,北京102249 [2]中国石化胜利油田分公司地质科学研究院,山东东营257015

出　　处：《现代地质》2013年第5期1147-1152,共6页Geoscience

基　　金：国家科技重大专项项目"准噶尔盆地碎屑岩层系大中型油气田形成规律与勘探方向"(2011ZX05002-002)

摘　　要：通过准噶尔盆地车排子凸起沙湾组二段油藏的油源条件、沉积储层特征、输导通道及其时空配置等成藏要素解剖,油藏和失利圈闭多项地质参数的对比分析,明确了油气成藏机制及主控因素。研究区油气主要来自昌吉凹陷侏罗系和二叠系烃源岩;扇三角洲水下分支水道侧翼上倾尖灭砂岩和滨浅湖滩坝砂体构成了主要的储集层类型;稳定分布的沙湾组一段毯砂、红车断裂、浅部调整断层构成了网毯式输导格架。成藏要素时空上的良好配置,为研究区"缓坡远源、厚砂侧向输导、中低充注"奠定了基础。储层岩性物性控制了油气充注程度;浅层调整断层倾角、圈闭砂体与沙湾组一段毯砂距离以及两者之间泥岩累计厚度三者共同控制了油气的输导效率和圈闭含油概率。Through the analysis on reservoir formation factors,such as source condition,sedimentary reservoir characteristics,migration path and space-time coupling,and by means of the correlation and comparison on multiple geological parameters from reservoir and failed reservoir,the reservoir accumulation mechanism and main factors are clarified herein for the second member of Shawan Formation in Chepaizi uplift.It is revealed that,the hydrocarbon in the study area is mainly from the Jurassic and Permian source rocks in Changji sag. The underwater distributary channel sandstone and beach bar sand body are the most favorable storage rocks of reservoir.The stable distribution,good physical properties,and great thickness of sand stone in the first number of Shawan Formation and fractures acted as the conduit system of net-carpet model.Thanks to the favorable time-space coupling,the study area is characterized by gentle slope with remote source,lateral migration along thick sandbody,and low to moderate charging.The lithology,porosity and permeability of reservoir control the oil and gas-filling.Three factors,the fault dip in shallow formation,distance between trap and thick sandstone in the first number of Shawan Formation,and total thickness of interlayer mudstone,control the oil and gas transporting efficiency and trap oil probability.

关 键 词：网毯式输导 沙湾组二段 成藏主控因素 准噶尔盆地 车排子凸起 

分 类 号：TE122.3[石油与天然气工程—油气勘探]