天津幅地區(qū)重力場與構(gòu)造特征研究
發(fā)布時間：2019-04-02 16:02
【摘要】：天津幅地區(qū)1:100萬比例尺圖幅包括天津幅的整個地區(qū),地理位置位于北緯36°~40°、東經(jīng)114°~120°之間。天津幅地區(qū)西起太行山,東到渤海和山東萊州,北依燕山,南至泰安市,總面積約23.4×104km2。由于天津幅經(jīng)歷了多次構(gòu)造運(yùn)動與沉積演化,導(dǎo)致其周邊隆起區(qū)與渤海灣盆地的沉積地層具有不同特征。天津幅地區(qū)的地球物理及地質(zhì)工作程度高低不一,渤海灣盆地的研究程度相對較高,而在其他地區(qū)的研究程度則較低。目前為止,還沒有系統(tǒng)利用天津幅已完成的重力資料對天津幅地區(qū)構(gòu)造等進(jìn)行系統(tǒng)研究。因此本文以重力資料為主,結(jié)合地質(zhì)、地球物理等研究成果對天津幅的構(gòu)造體系、沉積地層發(fā)育特征等進(jìn)行研究。本文通過對天津幅地區(qū)重力資料的系統(tǒng)收集、整理及處理得到了布格重力異常資料,利用RGIS軟件對布格重力異常進(jìn)行了趨勢分析、解析延拓、滑動平均濾波、水平一階導(dǎo)數(shù)、垂向二階導(dǎo)數(shù)等處理,同時結(jié)合研究區(qū)的構(gòu)造地質(zhì)、區(qū)域地質(zhì)、地震測量、鉆井勘探等研究成果對重力異常特征進(jìn)行了綜合研究,對研究區(qū)的局部重力異常成因進(jìn)行了分析研究。認(rèn)為研究區(qū)內(nèi)太行山隆起、燕山褶皺帶、魯西南隆起以及魯東隆起帶內(nèi)的局部重力高是由基底隆起引起,而局部重力低則是由中、新生界局部增厚引起;渤海灣盆地內(nèi)的局部重力高一般是由基底局部隆起(斷隆)引起,局部重力低則是由中、新生界凹陷(斷凹)引起。本文根據(jù)重力場特征并結(jié)合前人相關(guān)研究成果推測出了天津幅地區(qū)斷裂體系。天津幅地區(qū)主要發(fā)育NE(NNE)、NW及近EW向三組斷裂,不同走向的斷裂平面上交織成網(wǎng)格狀。根據(jù)布格重力異常特征對天津幅地區(qū)進(jìn)行了構(gòu)造單元劃分,可劃分為太行山隆起、燕山褶皺帶、渤海灣盆地、魯西南隆起、魯東隆起這5大一級構(gòu)造單元,其中渤海灣盆地又進(jìn)一步劃分為2個隆起區(qū)、5個坳陷區(qū)共7個二級構(gòu)造單元。同時,本文利用地震、鉆井等研究成果,選擇了能大體控制渤海灣盆地主要構(gòu)造格局的6條重力剖面進(jìn)行了擬合反演,通過定性與定量的解釋,采用線性回歸法計算獲得了研究區(qū)內(nèi)新生界底界埋深。結(jié)果表明:渤海灣盆地凸起區(qū)內(nèi)新生界厚度較薄,主要為新近系和第四系,其最小沉積厚度約500m左右,最大厚度不到3000m;在凹陷區(qū)內(nèi)新生界較厚,主要為古近系、新近系和第四系,平均沉積厚度超過3000m,在沉降中心處其厚度達(dá)8000m以上。
[Abstract]:The 1: 1 million scale map of Tianjin is located between 36 擄~ 40 擄N and 114 擄~ 120 擄E. The Tianjin area rises from Taihang Mountain to the west, to the Bohai Sea and Laizhou in the east, to Yanshan in the north and to Tai'an in the south, with a total area of about 23.4 脳 104km2. Because Tianjin has experienced many tectonic movements and sedimentary evolution, the sedimentary strata of its peripheral uplift area and Bohai Bay basin have different characteristics. The degree of geophysical and geological work in Tianjin area is different. The degree of study in Bohai Bay basin is relatively high, but the degree of study in other areas is lower. Up to now, there is no systematic study on the tectonics of Tianjin area by using the gravity data of Tianjin amplitude. Therefore, based on gravity data and combined with geological and geophysical research results, this paper studies the tectonic system of Tianjin amplitude and the characteristics of sedimentary strata development. In this paper, the Bouguer gravity anomaly data are obtained by systematically collecting, sorting and processing the gravity data in Tianjin area. The trend analysis of Bouguer gravity anomaly is carried out by using RGIS software, and the continuation, moving average filtering and horizontal first-order derivative are analyzed. At the same time, combined with the research results of tectonic geology, regional geology, seismic survey and drilling exploration in the study area, the characteristics of gravity anomaly are comprehensively studied. The cause of local gravity anomaly in the study area is analyzed. It is considered that the local gravity height in Taihang mountain uplift, Yanshan fold belt, southwest Shandong uplift and east Shandong uplift zone is caused by basement uplift, while local gravity low is caused by local thickening of Mesozoic and Neogene. The local gravity height in Bohai Bay basin is usually caused by the basement local uplift (fault uplift), while the local gravity low is caused by the Meso-Cenozoic sag (fault depression). Based on the characteristics of gravity field and previous research results, the fault system in Tianjin area is deduced in this paper. Three sets of faults, NE (NNE), NW and near EW, are mainly developed in the Tianjin area, and the fracture planes with different strike are interlaced into grids. According to the characteristics of Bouguer gravity anomaly, the tectonic units of Tianjin area can be divided into Taihang uplift, Yanshan fold belt, Bohai Bay Basin, Southwest Shandong uplift and East Shandong uplift, which can be divided into five first-order tectonic units: Taihang Mountain uplift, Yanshan fold Belt, Bohai Bay Basin, Southwest Shandong uplift and East Shandong uplift. The Bohai Bay basin is further divided into 2 uplift areas and 7 secondary tectonic units in 5 depression areas. At the same time, based on the research results of earthquake and drilling, six gravity profiles which can control the main tectonic pattern of Bohai Bay Basin are selected to fit and invert, and the results are explained qualitatively and quantitatively. The buried depth of Neozoic bottom boundary in the study area is calculated by linear regression method. The results show that the thickness of Neozoic in the bulge area of Bohai Bay basin is thin, mainly Neogene and Quaternary, the minimum sedimentary thickness is about 500 m, and the maximum thickness is less than 3 000 m. The Neozoic is thicker in the depression, mainly Paleogene, Neogene and Quaternary. The average sedimentary thickness is more than 3000m, and its thickness is more than 8000m at the center of subsidence.
【學(xué)位授予單位】：西安石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P548;P312
本文編號：2452694
[Abstract]:The 1: 1 million scale map of Tianjin is located between 36 擄~ 40 擄N and 114 擄~ 120 擄E. The Tianjin area rises from Taihang Mountain to the west, to the Bohai Sea and Laizhou in the east, to Yanshan in the north and to Tai'an in the south, with a total area of about 23.4 脳 104km2. Because Tianjin has experienced many tectonic movements and sedimentary evolution, the sedimentary strata of its peripheral uplift area and Bohai Bay basin have different characteristics. The degree of geophysical and geological work in Tianjin area is different. The degree of study in Bohai Bay basin is relatively high, but the degree of study in other areas is lower. Up to now, there is no systematic study on the tectonics of Tianjin area by using the gravity data of Tianjin amplitude. Therefore, based on gravity data and combined with geological and geophysical research results, this paper studies the tectonic system of Tianjin amplitude and the characteristics of sedimentary strata development. In this paper, the Bouguer gravity anomaly data are obtained by systematically collecting, sorting and processing the gravity data in Tianjin area. The trend analysis of Bouguer gravity anomaly is carried out by using RGIS software, and the continuation, moving average filtering and horizontal first-order derivative are analyzed. At the same time, combined with the research results of tectonic geology, regional geology, seismic survey and drilling exploration in the study area, the characteristics of gravity anomaly are comprehensively studied. The cause of local gravity anomaly in the study area is analyzed. It is considered that the local gravity height in Taihang mountain uplift, Yanshan fold belt, southwest Shandong uplift and east Shandong uplift zone is caused by basement uplift, while local gravity low is caused by local thickening of Mesozoic and Neogene. The local gravity height in Bohai Bay basin is usually caused by the basement local uplift (fault uplift), while the local gravity low is caused by the Meso-Cenozoic sag (fault depression). Based on the characteristics of gravity field and previous research results, the fault system in Tianjin area is deduced in this paper. Three sets of faults, NE (NNE), NW and near EW, are mainly developed in the Tianjin area, and the fracture planes with different strike are interlaced into grids. According to the characteristics of Bouguer gravity anomaly, the tectonic units of Tianjin area can be divided into Taihang uplift, Yanshan fold belt, Bohai Bay Basin, Southwest Shandong uplift and East Shandong uplift, which can be divided into five first-order tectonic units: Taihang Mountain uplift, Yanshan fold Belt, Bohai Bay Basin, Southwest Shandong uplift and East Shandong uplift. The Bohai Bay basin is further divided into 2 uplift areas and 7 secondary tectonic units in 5 depression areas. At the same time, based on the research results of earthquake and drilling, six gravity profiles which can control the main tectonic pattern of Bohai Bay Basin are selected to fit and invert, and the results are explained qualitatively and quantitatively. The buried depth of Neozoic bottom boundary in the study area is calculated by linear regression method. The results show that the thickness of Neozoic in the bulge area of Bohai Bay basin is thin, mainly Neogene and Quaternary, the minimum sedimentary thickness is about 500 m, and the maximum thickness is less than 3 000 m. The Neozoic is thicker in the depression, mainly Paleogene, Neogene and Quaternary. The average sedimentary thickness is more than 3000m, and its thickness is more than 8000m at the center of subsidence.
【學(xué)位授予單位】：西安石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P548;P312
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