准噶尔盆地西缘车排子地区沙湾组沉积与成藏控制因素  

Sedimentary and Hydrocarbon Accumulation Control Factors about Shawan Formation of Chepaizi Area in Western Junggar Basin

作　　者：刘传虎[1] 王学忠[1] 

机构地区：[1]中国石化胜利油田分公司,山东省东营市257001

出　　处：《中国石油勘探》2012年第4期15-19,5-6,共5页China Petroleum Exploration

基　　金：国家"973"项目"中国西部典型叠合盆地油气成藏机制与分布规律"(2006CB202306)

摘　　要：沙湾组是准噶尔盆地西缘车排子地区一套有利的含油层系,纵向上分为3个砂层组,其沉积特征和成藏条件各有不同。沙湾组一段为一套进积型的辫状河三角洲沉积,古物源和古地形对其沉积展布和物性起着重要的控制作用;沙湾组二段为滩坝砂沉积,其沉积、充填、改造、分选明显受到古波浪、古沉积基准面等古地理环境的影响;沙湾组三段为一套稳定的泥岩沉积,作为区域性的盖层,对沙湾组一段、二段的成藏具有良好的保护作用。沙湾组成藏控制因素包括烃源岩条件、输导条件、保存条件和成藏模式。在上述工作基础上,利用地震属性变化,在地质条件约束下,综合预测了有利油气分布区。通过钻探,探明稀油储量1500×104t、稠油储量5128×104t,已建成82×104t的年生产能力。Shawan Formation is a set of favorable oil-bearing series in Chepaizi area in the west of Junggar Basin, which is classified into three oil-bearing strata vertically with different sedimentary characteristics and hydrocarbon accumulation conditions. The first member of Shawan Formation is a progradational braided-river delta deposition, of which paleo-provenance system and ancient landform play an important role in the development of its sedimentary distribution and physical properties. The second member of Shawan Formation is beach-bar sandbodies deposition, of which the deposition, filling, modification, and selectivity are greatly influenced by paleogeographic environment such as paleowave and paleodepositional base-level. The third member of Shawan Formation is a set of stable mudstone deposition. It can be used as a regional seal, and protect hydrocarbon accumulation for the first member and the second member well. Major control factors include hydrocarbon source rock condition, migration pathways, preservation conditions, and accumulation models. Based on above research, this paper comprehensively predicted the favorable oil distribution areas by analyzing the variation of seismic attributes restricted by geological conditions. It has proved thin oil reserves of 1500 × 104t, heavy oil reserves of 5128 × 104t by drilling, and built 82 × 104t annual production capacity.

关 键 词：准噶尔盆地 沙湾组 辫状河三角洲.滩坝砂体 沉积 成藏 

分 类 号：TE112[石油与天然气工程—油气勘探]