本文選題：渤海 + 新生代�。� 參考：《中國石油大學(xué)(華東)》2015年碩士論文

【摘要】：渤海新生代盆地是新生代渤海灣盆地的海域部分,其構(gòu)造演化與渤海灣盆地密不可分。渤海灣盆地在新生代為典型的斷陷-拗陷盆地,渤海則是其漸新世以來的沉積、沉降中心。在渤海新生代盆地演化的斷陷期,渤�；准吧w層中的斷層活動強(qiáng)烈,盆地發(fā)生裂陷沉降;在拗陷期,研究區(qū)發(fā)生區(qū)域性整體沉降,且具有普遍的加速沉降的特征。本論文借助渤海的地質(zhì)解釋后的地震剖面,利用平衡剖面分析的手段,對渤海新生代盆地的淺層構(gòu)造變形特征進(jìn)行了分析。在此基礎(chǔ)上,本文結(jié)合莫霍面埋深和軟流圈埋深等深部資料及其他深部結(jié)構(gòu)成果,如層析成像等,對其淺部構(gòu)造特征與深部結(jié)構(gòu)的耦合關(guān)系進(jìn)行比對分析,以期重現(xiàn)渤海新生代盆地的構(gòu)造演化過程,探討渤海新生代盆地淺部構(gòu)造遷移性特征的深部動力學(xué)機(jī)制。渤海各坳陷新生代構(gòu)造樣式和斷裂時空展布特征表明,渤海新生代斷裂的發(fā)育總體受控與盆地伸展作用機(jī)制,在中漸新世后受研究區(qū)走滑斷裂活動的影響。本文通過選取基本垂直渤海構(gòu)造走向的6條大剖面,利用平衡剖面分析的結(jié)果進(jìn)行了伸展量的估算,并在剖面上選取虛擬井計算不同時期的沉積沉降速率。結(jié)果表明,在盆地演化的斷陷期,孔店組-沙四段沉積期,各坳陷沉積沉降速率較低且相差不大,研究區(qū)內(nèi)同期發(fā)育多個沉積沉降中心;至沙三段沉積期沉積沉降速率達(dá)到最大,東營組沉積期沉積沉降速率變小,但沉積沉降中心已從四周逐步遷移至渤中坳陷;在拗陷期,以渤中坳陷為中心,出現(xiàn)的強(qiáng)烈沉積沉降,明顯高于正常拗陷階段沉積沉降速率。對于研究區(qū)上述淺部構(gòu)造特征,本文結(jié)合最新的深部探測資料分析提出,渤海新生代盆地的斷裂展布,受中生代末先存的構(gòu)造格局影響;斷陷盆地的形成,則是太平洋板塊俯沖的持續(xù)后退和印藏碰撞遠(yuǎn)程效應(yīng)持續(xù)東進(jìn)共同作用的結(jié)果;中漸新世以來的加速沉降,則對應(yīng)于太平洋俯沖板片前緣向東遷移引起的巖石圈迅速冷卻的熱沉降效應(yīng)。
[Abstract]:The Cenozoic Bohai Basin is part of the Bohai Bay Basin in the Cenozoic, and its tectonic evolution is closely related to the Bohai Bay Basin. The Bohai Bay basin is a typical fault-depression basin in the Cenozoic, and the Bohai Sea is the center of sedimentation and subsidence since Oligocene. During the evolution of the Cenozoic basins in the Bohai Sea, the fault activity in the basement and caprock of the Bohai Sea was strong, and the subsidence occurred in the basin. In the depression period, the regional whole subsidence occurred in the study area, and the characteristics of general accelerated subsidence occurred. In this paper, the characteristics of shallow tectonic deformation in the Cenozoic basin of Bohai Sea are analyzed by means of the seismic section of the Bohai Sea after geological interpretation and the analysis of the equilibrium section. On this basis, the coupling relationship between the shallow structural characteristics and the deep structure is compared and analyzed by combining the deep data of Moho surface and the depth of the asthenosphere and other deep structure achievements, such as tomography, etc. In order to reproduce the tectonic evolution process of the Cenozoic basin in Bohai Sea, the deep dynamic mechanism of the shallow structural migration characteristics of the Cenozoic basin in the Bohai Sea is discussed. The Cenozoic structural style and temporal and spatial distribution of faults in the Bohai depression indicate that the development of the Cenozoic faults in the Bohai Sea is generally controlled and the extensional mechanism of the basin is affected by the strike-slip fault activity in the studied area after the Middle Oligocene. In this paper, by selecting 6 large sections of the basic vertical Bohai tectonic strike, the authors estimate the extensibility by using the results of the equilibrium section analysis, and select virtual wells on the section to calculate the sedimentation rate in different periods. The results show that the sedimentation rate of each depression is relatively low during the faulted period of basin evolution and the sedimentary period of Kongdian formation and Sha 4 member, and there are many sedimentation centers developed in the same period in the study area. During the depositional period from the third member to the Shahejie formation, the sedimentation rate reached the maximum, but the sedimentation center of the Dongying formation became smaller, but the sedimentation center moved gradually from the surrounding area to the Bozhong depression, and in the depression period, the center of the sedimentation center was the Bozhong depression. The strong sedimentation rate is obviously higher than that in the normal depression stage. For the shallow structural characteristics mentioned above in the study area, this paper, based on the latest deep exploration data, suggests that the fault distribution of the Cenozoic basin in the Bohai Sea is affected by the pre-existing tectonic pattern at the end of Mesozoic, the formation of the faulted basin, and the formation of the faulted basin. It is the result of the continuous retrogression of the Pacific plate and the continuous eastward effect of the India-Tibet collision, and the accelerated subsidence since the Miocene. It corresponds to the thermal subsidence effect of rapid cooling of lithosphere caused by eastward migration of the front edge of the Pacific subduction plate.
【學(xué)位授予單位】：中國石油大學(xué)(華東)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P736.1

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