准噶尔盆地西缘车排子地区沙湾组沉积与成藏控制因素
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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.
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.
引文
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[2]Soreghan M J,Andrews C.Textural and compositional variability across littoral segment of Lake Tanganyika:the effect of asymmetric basin structure on sedimentation in large rift lakes.AAPG Bulletin,1996,80(3):382～409.
[3]张善文,王英民,李群.应用坡折带理论寻找隐蔽油气藏[J].石油勘探与开发,2003.30(3):53～61.
[4]冯有良.断陷湖盆沟谷及构造坡折带对砂体的控制作用[J].石油学报,2006,27(1):13～16.
[5]潘元林,张善文,肖焕钦.济阳断陷盆地隐蔽油气藏勘探[M].北京:石油工业出版社,2003.
[6]李安夏,王冠民.间歇性波浪条件下湖泊滩坝砂的结构特征[J].油气地质与采收率,2010,17(3):12～14.
[7]何登发,陈新发,张义杰.准噶尔盆地油气富集规律[J].石油学报,2004.25(3):1～10.
[8]贾小乐,何登发,童晓光,王兆明.全球大油气田分布特征[J].中国石油勘探,2011,16(3):1～7.
[9]罗群.试论中国石油地质勘探理论的进一步创新——理论创新的概念、模式与思考[J].中国石油勘探,2010,15(5):6～10.
[10]张善文.济阳坳陷第三系隐蔽油气藏勘探理论与实践[J].石油与天然气地质,2006,27(6):731～740,761.
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