准噶尔盆地北三台西斜坡岩性和复合圈闭预测  

Prediction of Lithologic and Lithologic-structural Traps in the Beisantai West Slope,the Junggar Basin

作　　者：向辉 康永尚[2,3] 陈春勇 

机构地区：[1]中国石油新疆油田分公司,新疆阜康831511 [2]中国石油大学,北京102249 [3]油气资源与探测国家重点实验室中国石油大学,北京102249

出　　处：《特种油气藏》2015年第4期12-15,151,共4页Special Oil & Gas Reservoirs

基　　金：中国石油天然气股份有限公司新疆油田分公司科研项目"准噶尔盆地白垩系油气成藏研究和有利区预测"(201103012)

摘　　要：北三台西斜坡白垩系在斜坡背景下发育鼻突构造，局部存在中小型断裂，构造圈闭不发育，为预测白垩系隐蔽圈闭发育带，采取了高分辨率层序地层与构造背景、沉积相和成藏模式综合研究的分析方法，确定清水河组中上部和呼图壁河组下部的3个准层序（K1q2^1-（2-4）、K1q2^1-1和K1h1^2-3）为含油气准层序（小层）。据分析，该3个含油气准层序以辫状河沉积为主,其中辫状河河道带和冲积扇是储集层发育的有利相带。在水进背景下，超覆尖灭的砂体和上覆泥岩的组合有利于形成上倾尖灭岩性圈闭，而局部断裂与超覆尖灭砂体的组合则易形成岩性-构造复合圈闭。根据以上特点，在研究区东南部成功预测了5个上倾尖灭岩性圈闭和岩性-构造复合圈闭，对该区白垩系油气勘探具有一定的指导意义。In the Beisantai West Slope,the Cretaceous formations contain nose- like structures on the slope background,with medium or minor faults locally and absence of structural traps. To identify belts with development of subtle Cretaceous traps,high- resolution sequence stratigraphy,structural setting,sedimentary facies and reservoir- forming patterns were combined to prove 3 sub- sequences( K( 2- 4)- 31q1- 2,K1q1- 12 and K1h2 1) as hydrocarbon bearing in middle and upper parts of the Qingshuihe Formation and the lower part of the Hutubihe Formation. Analysis results show that the3 hydrocarbon- bearing sub- sequences are dominated by braided river sediments,and braided river channels and alluvial fan are favorable belts with development of reservoirs. In the case of water transgression,the combination of sandstone with overlap pinchout and the covering mudstone may promote formation of lithologic trap with upward pinchout,while the combination of regional faults and sandstone with overlap pinchout may facilitate formation of lithologic- structural trap. With consideration to these characteristics,five lithologic traps with upward pinchout and lithologic- structural traps have been predicted successfully in the southeastern part of the study area. Research results may provide necessary guidance for oil and gas exploration in the Cretaceous formations of the area.

关 键 词：岩性和复合圈闭 高分辨层序地层 成藏模式 北三台西斜坡 准噶尔盆地 

分 类 号：TE122.2[石油与天然气工程—油气勘探]