柴西地区新生代构造变形时空次序及油气意义

Spatial and temporal order of Cenozoic structure deformation in the Western Qaidam Basin and its hydrocarbon significance

落实柴达木盆地西部地区(简称柴西地区)新生代构造变形时空次序对完善青藏高原隆升过程具有重要意义,同时亦为勘探实践提供一种"构造找油"的新方法。利用柴西地区近几年最新采集的地震、钻井和岩心等资料,基于生长地层法,对新生代构造变形时空次序进行研究,并进行有利区带评价。研究结果表明:柴西地区新生代构造变形时序总体由SW向NE方向变新;新生代构造变形在时间域和空间域上的分布具有层次性,是构造位移沿着滑脱面递进传递产生的;英雄岭构造带西部与昆北、乌南地区为最有利的勘探区,阿拉尔、英雄岭构造带东部与柴西北地区北部为次有利勘探区,而鄂博山至黄瓜梁地区为风险勘探区。

It is of scientific important to understand the spatial and temporal order of Cenozoic structure deformation in the Western Qaidam Basin,which can improve the study on the uplifting process of the Tibet Plateau,and it also provides a new method of'exploring oil based on structure'. In this paper,the latest seismic data,borehole data and core data acquired from the Western Qaidam Basin in the last few years were used to study the spatial and temporal order of structure deformation in the Cenozoic based on the growth strata analyzing method. Study results indicate that:(1)the overall structure deformation in the Cenozoic of the Western Qaidam Basin is getting younger from SW to NE;(2)the distribution of the tectonic deformation in the Cenozoic of the Western Qaidam Basin is stratified in the time domain and spatial domain,which was resulted from the progressive transformation of the structure displacement along the detachment surface;(3)the western part of Yingxiongling structure belt and the Kunbei and Wunan areas are the most favorable exploration areas. The eastern part of Alar and Yingxiongling structure belt and the northern part of the Western Qaidam Basin are the second choice,while the areas from Eboshan to Huanggualiang are risky.