塔里木盆地塘古巴斯坳陷玛东构造带断裂特征及成因探讨

发布时间：2018-04-25 04:26

本文选题：塘古巴斯坳陷 + 玛东构造带　；参考：《大地构造与成矿学》2016年04期

【摘要】：塘古巴斯坳陷是塔里木盆地油气勘探的重要接替区,初步研究显示玛东构造带具有良好的油气远景,但是构造研究相对薄弱,制约了下一步的油气勘探。本文利用最新的钻井和地震资料解释成果,对塘古巴斯坳陷玛东构造带断裂构造的几何学和运动学特征进行了分析,并探讨了断裂差异演化的成因机制。结果表明,玛东构造带纵向上以中寒武统阿瓦塔格组膏盐岩为界,形成盐下基底卷入逆冲断裂和盐上盖层滑脱逆冲断裂两套变形系统;横向上从南向北,划分为3个构造段,且断裂组合样式逐渐复杂。构造带南段、中段和北段断裂主要活动期分别为志留纪泥盆纪、中奥陶世末二叠纪以及晚奥陶世中期泥盆纪,断裂活动具有中段早、两端晚以及中间延续时间长、两端延续时间短的特征。不同构造段地层缩短量和缩短率反映,构造带北段在志留纪泥盆纪缩短作用最强,构造带中段和南段则在晚奥陶世缩短作用最强,断裂活动性整体具有由北东往南西减弱的规律。玛东构造带差异构造变形受多重因素控制,包括:基底断裂的控制作用、古隆起的隆升阻挡作用、构造应力场的叠加作用、盐岩层系的调节作用和区域构造的反转作用。
[Abstract]:Tangkusi depression is an important replacement area for oil and gas exploration in Tarim Basin. The preliminary study shows that the Madong tectonic belt has a good oil and gas prospect, but the structural research is relatively weak, which restricts the next oil and gas exploration. Based on the latest drilling and seismic data interpretation results, this paper analyzes the geometrical and kinematic characteristics of the fault structures in the Madong structural belt of the Tangkusi depression, and probes into the genetic mechanism of the differential evolution of the faults. The results show that the Mato tectonic belt is divided into three tectonic segments from the south to the north in the longitudinal direction of the Middle Cambrian Awa Tag formation gypsum salt rock, forming two sets of deformation systems: the subsalt basement involvement thrust fault and the upper salt caprock detachment thrust fault, and laterally from the south to the north. And the fault combination style becomes more and more complicated. The main active periods of faults in the southern, middle and northern segments of the tectonic belt are Silurian Devonian, late Middle Ordovician Permian and late late Ordovician Devonian, respectively. A feature of short duration at both ends. The stratigraphic shortening and shortening rate of different structural segments reflect that the northern segment of the tectonic belt has the strongest shortening effect in the Silurian Devonian, while the middle and southern segments of the tectonic belt have the strongest shortening effect in the late Ordovician. The whole faulting activity is weakened from north east to south west. The differential structural deformation of the Madong tectonic belt is controlled by many factors, including the control of basement faults, the uplift and blockage of paleouplift, the superposition of tectonic stress field, the adjustment of salt strata and the inversion of regional structures.
【作者单位】：中国石油大学油气资源与探测国家重点实验室;中国石油大学盆地与油藏研究中心;中国石化西北油田分公司;
【基金】：国家自然科学基金项目(41572105,41172125) 国家重点基础研究发展计划973项目(2012CB214804) 国家科技重大专项(2011ZX05002-003-001) 中国石油化工股份有限公司项目(P14131,P11086)联合资助
【分类号】：P618.13

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