【作者】 陈杨；

【导师】 赵锡奎；

【作者基本信息】 成都理工大学 ， 矿产普查与勘探， 2007， 硕士

【摘要】 巴楚隆起位于塔里木盆地中央隆起带西段，几乎缺失了整个中生界沉积，因而它的形成演化一直有着争议。近年来有学者提出巴楚隆起现今的构造格局形成于喜山晚期的观点。本文通过对巴楚隆起上断裂和局部构造的研究，利用平衡剖面法编制了过隆起构造轴的构造演化图，通过分析认为，现今巴楚隆起上的断裂主要形成于海西晚期，巴楚隆起主要形成于二叠纪末的海西末期运动。巴楚隆起的形成发展过程具有旋回性的特点，震旦系拉张背景下发育少量张性正断层，加里东中期开始挤压上冲，早二叠世拉张活动，具有“拉而未裂，裂而未陷的特征”，晚二叠世挤压隆升，古近纪下沉接收沉积，喜山期强烈逆冲上隆最终定型。在前人研究基础上，本文提出了巴楚隆起中生代的隆升模式，认为巴楚隆起的隆升具有扭动的特点。整个巴楚隆起的断裂系统可以三分，按走向不同分为西段、中段及东段。平面上这些断裂具有东西呈弧形，中段平直的特点，纵向上东西段构造样式体现了走滑的特点，而中段断裂则基本沿断展褶皱轴面发育，走滑特征微弱。因此，巴楚隆起东西段的挤压隆升是不均衡的，这种不均衡与基底断裂相关，正是这种不均衡挤压作用最终导致巴楚隆起形成。巴楚隆起地区油气藏的形成受构造演化制约程度很大。首先，本区曾经长期隆起而不利油气生成；其次，寒武—奥陶系本区大部暴露地表遭受剥蚀，形成了较好的寒武—奥陶系储层；第三，本区海西以来逐渐隆升暴露，至中生代缺失了几乎整个中生界沉积，一方面形成了石炭—二叠系的储层和圈闭，另一方对早期的古油藏保存不利；第四，本区喜山晚期强烈逆冲，先存断裂强烈活动，导致早期油气藏大量被破坏。通过对巴楚地区典型油气藏的分析后认为，巴楚隆起上的油气资源以天然气为主，主要有利区带集中于巴楚隆起南缘、西缘断裂构造带，此外寒武—奥陶系岩溶缝洞型储层也是将来勘探的重点，但其中是否含油气以及量的大小则主要取决于是否有沟源断裂发育。而中段压扭低隆将是未来勘探的远景区域，需要引起人们的重视。更多还原

【Abstract】 Bachu uplift is located in the western part of the central uplift in Tarim basin andthere has nearly no Mesozoic deposit so as to be disputed over all the times. Now thatseveral scholars refer to the point that Bachu uplift formed in Himalayan tectonicmovements, this paper reinforce that Bachu uplift and faults in the uplift were mainlyraised in the Hereynian period by the analysis of the faults and local structural traps.By making the evolution figures of tectonic we assume that the development of Bachuuplift has the feature of cyclicity. There are some normal fault formed in Sinian. Andthe site raise and uplift in Caledonian. It then subducted in the early Permian andappear to have no pull apart structure. Later it raised in the late Permian and subsidedin the early Tertiary soon. Finally it turned to a uplift with fracture after stronglyuplifting in Himalayan period.Based on the studies of former scholars this paper raises the model that howbachu uplift raise in Mesozoic. We believe that shearing is the ultimate function inthis section. The fault system in Bachu uplift can be divided into three sect which arethe west, the middle and the east. The east and west part have the figures of arc onplanar surface while the middle one is straight. Sectionally, the tectonic styles of westand east systems of fault are both strike-sliding, however, faults in the middle almostappear along the axial plane of fault-propagation folds and have nearly strike-slidingstructure. From that we can see the uplifting in Bachu area was not united anduniform, which is connected with the time schedule of tectonic evolution. And it isthat the ununiform press formed Bachu uplift.Oil fields in Bachu uplift has been controlled greatly by the degree of tectonicevolution. First of all, this region used to be uplift in a long geologic term and was notgood for oil concentration.Secondly, however, the conbonate reservoir in Cambrianand Ordovician was formed by erosion, which happened when this site was exposedup the water level. Thirdly, there are no Msozoic deposite thanks to the uplifting sinceHercynian movement. Carboniferous and Permian reservoir had been greatlymeliorated in one hand and in the other hand it is not good for the prevservation ofpreexistent oil and gas reservoirs. Fourthly, this site uplifted strongly in lateHimalayan period and former faults acted strongly, which destroyed the former oil and gas pools.According to the analysis of Bachu’s oil and gas fields we believe that gas is themain hydrocarbon form in this region. The southern tectonic section and the westernfault control tectonic section are good places. Besides, the karst gap reservoirs inCambrian and Ordovician are important in the future and the degree of thesereservoirs lies on whether there have some faults that connected the source rocks andthe reservoirs.更多还原