阿尔金斜坡东段新生代断裂系统及大型油气田形成  

Cenozoic Fault System and Its Large-Scale Oil-Gas Accumulation in the Eastern Part of Altun Slope,Qaidam Basin

作　　者：程玉红[1] 马新民[1] 石亚军[1] 马峰[1] 乐幸福[1] 王鑫[1] 张平[1] 

机构地区：[1]中国石油勘探开发研究院西北分院,兰州730020

出　　处：《新疆石油地质》2013年第6期640-644,617,共5页Xinjiang Petroleum Geology

基　　金：国家科技重大专项(2011ZX05007-006);中国石油重大科技项目(2011E-03)

摘　　要：利用钻井和地震资料,对柴达木盆地阿尔金斜坡东段新生代断裂系统的几何学特征和演化过程进行了系统的梳理,根据平面展布,把研究区新生代断裂分为北西向、北东东向和北西西向三组;根据断裂演化特征,又将其分为古新世-始新世形成尖顶山地区北西西向北倾断裂,东坪—牛鼻子梁—鄂博梁鼻状构造带北西向断裂正反转,中新世北东向断裂形成和上新世北西西向南倾压扭断裂发育3个阶段;采用趋势法地层恢复技术与回剥法构造平衡手段,结合材料力学原理,恢复了新生代各主要地质时期古应力场的最大主压应力方向;根据最大主压应力方向与断裂活动之间的关系,对各主要断裂的封闭、开启作用进行了讨论,认为新生代断裂在山前斜坡带大气田形成过程中起着重要作用。Based on the latest data from wells and seismic interpretation, this paper firstly discussed the Cenozoic fault geometry and evolu- tion of the eastern part of southern Altun slope in Qaidam basin. According to the planar distribution, the fault can be divided into three groups with NW, NEE and NWW strikes. And on the basis of the profile evolution, there are obviously three stages in the development of Cenozoic fault： in the Paleocene to Eocene, the north tilted fault with the strike of NWW in Jiandingshan area was formed, and the NW- trending fault in Dongping-Niubiziliang-Eboliang nose-like structural belt was positively inversed as well; in the Miocene, NE-trending faults appeared, and in the Pliocene, the south tilted compresso-shear faults with the strike of NWW came into being. Also, by means of for- mation restoration and structural balance, combined with the principle of material mechanics, the orientations of maximum principal stress in each geological time were determined. Finally, according to the relationship between the orientation of maximum principal compressive stress and the fault activity, the fault close and open processes were discussed, and it is suggested from regional hydrocarbon generation and expulsion history that the Cenozoic fault takes an important part in the large-scale gas accumulation in this piedmont slope bell.

关 键 词：柴达木盆地 阿尔金斜坡 新生代 断裂系统 大型油气田 

分 类 号：TE111.2[石油与天然气工程—油气勘探]