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库车坳陷构造挤压对流体压力的影响
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摘要
库车坳陷新生代以来处于强挤压的构造环境中,并且自山前向坳陷内部逆冲推覆,形成了现今断裂、逆冲推覆、断层相关褶皱等复杂构造面貌。正是由于研究区构造复杂,挤压强烈,坳陷内部流体动力发生、发展同其他盆地有着显著差异。在超压方面,除了沉积超压外,还有重要的构造挤压超压。对构造挤压背景下库车坳陷流体压力特征研究以及构造挤压超压贡献的评价有利于更好的认识前陆盆地中,构造应力场同流体动力场之间的关系,对前陆盆地油气成藏规律的研究有着重要的指导作用。
     本次论文以前人研究成果为依据,通过野外地质调研,利用野外断裂、褶皱、节理产状等信息辅以磁组构实验和岩石声发射对库车坳陷新生代以来构造挤压大小、方向做了研究。通过对比现今实测地层压力与利用泥岩压实曲线中等效深度法确定的最大埋深时期过剩压力,研究了库车坳陷流体压力特征。在对研究区新生代以来膏泥盐岩分布规律研究的基础上,定量的评价库车坳陷不同构造单元构造超压贡献。经过分析、总结最终得到的主要认识与成果如下:
     库车坳陷现今压力分布在平面上有所差异,目的层位下白垩统巴什基奇克组同古近系库姆格列木组均反映出:自前陆冲断带至坳陷,压力梯度逐渐减小,在塔北隆起地层压力降为静水压力。
     从泥岩压实曲线获知,整个库车坳陷从山前到塔北欠压实普遍存在,最大埋深时期过剩压力在坳陷中多大于10MPa。
     库车坳陷新生代以来经受了多期构造挤压,从野外调研、地震剖面观测、磁组构分析均表明新生代以来研究区强烈挤压,库车坳陷构造格局也定型于此阶段。构造挤压多以南北向为主,向西、向东误差小于30°,且最大挤压应力主要分布在50MPa—100MPa之间。
     古近系膏泥盐岩分布在平面上有所差异,两个高值区分别位于克拉苏西段大北地区以及拜城凹陷中部,自高值区向北厚度逐渐变薄,向南至塔北隆起YM2地区膏泥盐岩几乎尖灭。
     库车坳陷中,构造挤压超压大小与所处构造单元位置关系密切,坳陷内部构造挤压贡献率为20%—50%之间,塔北地区构造超压不存在。
Kuqa Depression has been involved in the tectonic setting of strong compression since Cenozoic. It thrusts from foreland of the orogen to the depression with complex structures such as faults, thrusts and fault—related folds. It is distinct from the other basins by hydrodynamic occurrence and its development. In terms of overpressure, there is not only deposition overpressure, but also tectonic overpressure, which is very important in forland basin. Thus, the characteristic study of fluid pressure in Kuqa Depression and evaluation of the contribution from over pressure of the tectonic compression are significant in understanding the relationship between tectonic stress field and fluid dynamic field in foreland basins, meanwhile, they play important roles in guiding the study of hydrocarbon accumulation in foreland basins.
     Based on previous research results, applyed by structrual analysis (fault, folds, joints), test of anisotropy of magnetic susceptibility(AMS), the test of AE in this thesis to study the orientation and magnitude of the tectonic compression since Cenozoic. Characteristics of fluid pressure are analysed beteen the excess pressure measured and that calculated by the time of largest buried depth period though compaction curve of mudstone. On the basis of distribution of mud and gypsum and salt rock of Kumugeliemu Formation and Suweiyi Formation,and quantitative evaluation is obtained of the contribution of overpressure of the tectonic compression in different tectonic units.The most significant fruits and major recognition of this thesis can be summarized as follows.
     Fluid pressure measurement indicates that the distribution of abnormal pressure in Kuqa Depression is various. Both of the pressure of Bashenjiqike Formation and Kumugeliemu Formation shows the same regulation:pressure gradient reduces from the foreland thrust belt to the depression, and the north Tarim uplift is just drops to hydrostatic pressure.
     Compaction curves of mudstone show that undercompaction was common in the entire Kuqa Depression from the foreland thrust belt to the north Tarim uplift. The excess pressure during the largest buried depth period was mostly over 1 OMpa.
     Kuqa Depression has experienced multi—periods of tectonic compression since Cenozoic. Field observation, seismic profiles, as well as magnetic fabric analysis show strong compression in the study area. The structural framework of the Kuqa Depression also was formed during this stage. The studies above indicate that the direction of the tectonic compression is mainly N—S direction with the deviation which is less than 30°to the west and east, and the maximum compressive stress range from 50Mpa to 100Mpa.
     Horizontal distribution of Paleogene mud, gypsum, and salt rocks is various. It reaches the peak in the Dabei area of east Kelasu and in middle of the Baicheng Sag. The thickness of mud, gypsum, and salt rocks reduce from the to north and south,and in the area of Yingmai of the north Tarim uplift it almost pinches.
     The contribution of over pressure of the tectonic compression is closely related to tectonic unit in the Kuqa Depression. The evaluation results show that the contribution rate of internal depression ranges from 20%—50% in the Kuqa Depression, while no tectonic compression exists in the north Tarim uplift.
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