【作者】 赵国玺；

【导师】 王震亮；

【作者基本信息】 西北大学 ， 矿物学、岩石学、矿床学， 2007， 硕士

【摘要】 断层作为油气运移的重要通道，其封闭与否对油气的运移与成藏起到了相当关键性的作用。断层封闭性演化史研究是当代地球科学研究的前沿领域和热点问题。在断层比较发育的地区开展断层封闭性演化史研究，可从重现油气的运移与聚集成藏过程，获得有关油气成藏与分布的关键性认识，对油气的勘探具有重要意义。本文选取鄂尔多斯盆地北部杭锦旗为研究区，探索开展泊尔江海子断裂带侧向封闭性演化史的研究，旨在搞清泊尔江海子断裂带从早侏罗纪到现今六个关键地质历史时期的侧向封闭性，从而为油气的勘探开发指明方向。围绕此目的，在广泛调研、收集分析大量第一手资料和计算机数值模拟的基础上，较系统地研究了泊尔江海子断裂带中三条主要断裂的展布特征以及它们的形成与演化，研究了它们现今的封闭性，并在恢复盆地埋藏史的基础上，利用计算机模拟对泊尔江海子断裂带从早侏罗纪到现今六个关键地质历史时期的侧向封闭性进行了模拟恢复。通过分析现今泊尔江海子断裂带两盘地层的岩性对置情况、断层泥比率(SGR)和两盘地层水的化学特征对比情况，认为现今泊尔江海子断裂带在侧向上是开启的，对油气运移起到了运移通道的作用。通过对盆地埋藏史的恢复，分别还原延安组沉积前、直罗组沉积前、安定组剥蚀前、白垩系沉积前、白垩系剥蚀前以及现今六个油气运移与成藏关键的地质历史时期泊尔江海子断裂带的展布特征以及断层两盘地层埋藏特征。在此基础之上，通过利用现今断层封闭性的研究方法，即分析断裂带断层泥比率(SGR)的方法分别对三条断裂在六个地质历史时期的封闭性进行了分析研究。研究认为泊尔江海子断裂带的三条断裂在这六个地质历史时期都是处于开启状态的。因此，我们得出结论，由于断层从油气开始生成、运移的时期开始就一直处于开启状态，所以，我们相信断裂带以南所生成的油气是可以通过断裂带运移到断裂带以北，并会在有条件的地方形成油气圈闭。更多还原

【Abstract】 As one of the most important pathways of hydrocarbon migration, the sealing properties of faults played a key role in the processes of hydrocarbon migration and accumulation. The study on evolution of fault sealing properties is one of the frontiers and hot topics of geosciences in the present age. Based on evolution of fault sealing properties analyzing in faults developed region, the processes of hydrocarbon generation, migration and accumulation can be reconstructed, thus some key knowledge on oil pool forming and distributing can be gained. Additionally, it is also helpful to hydrocarbon exploration.Hangjinqi, in the Northern Ordos basin, is selected as the major research area in this paper. The research on evolution of lateral sealing properties of Borjianghaizi fault zone has been explored to carry out, in order to clarify the lateral sealing properties of Borjianghaizi fault zone in 6 geological ages which from middle Jurassic till now, thus point out the directions of exploration and development of hydrocarbon. Therefore the systematical research on distributive features, formation, evolution and sealing properties in present age of three major faults in Borjianghaizi fault zone has been carried out, after the broad research、collecting and analyzing a lot of firsthand material and computer numerical simulation. And the lateral sealing properties of Borjianghaizi fault zone in 6 geological ages which from middle Jurassic till now has been simulated and reconstructed by using computer numerical simulation, based on reconstruction of basin burial history.The Borjianghaizi fault zone is considered as unsealing in present age and worked as migration pathway of hydrocarbon by analyzing the disposition of rock types of both fault blocks, Shale Gouge Ratio (SGR) and chemical characteristics of formation water within both fault blocks of Borjianghaizi fault zone.The distributive features and burial characteristics of both fault blocks of Borjianghaizi fault zone in key geological ages when before yanan formation deposited, before zhiluo formation deposited, before anding formation deposited, before Cretaceous System deposited, before Cretaceous System erosion and present has been reconstructed through reconstructing basin burial history.The sealing properties of three major faults in 6 key geological ages has been analyzed by using methods which are used in researching sealing properties in present age, such as Shale Gouge Ratio (SGR) analyzing. After study, the three major faults are considered as unsealing in those 6 geological ages.Therefore, the conclusion is achieved that the Borjianghaizi fault zone is unsealing since the time when the petroleum began to generate and migrate. Thus, the petroleum generated at the south of Borjianghaizi fault zone could migrate to the north of the Borjianghaizi fault zone and accumulate at the possible place.更多还原