發(fā)布時(shí)間：2018-05-08 20:36

  本文選題：中生界 + 沉積體系��； 參考：《西北大學(xué)》2015年碩士論文

【摘要】：臨汾-運(yùn)城盆地位于山西省南部,是疊加在華北克拉通之上的新生代斷陷盆地。以往的勘探和研究表明,該地區(qū)新生代斷陷時(shí)間新、堆積地層較薄,烴源巖不發(fā)育,故缺乏油氣資源潛力。但盆地新生界之下是否具有油氣資源潛力,以往并未開展專門研究。中-晚三疊世及早-中侏羅世地層是鄂爾多斯盆地及鄰區(qū)主要的烴源層和石油儲(chǔ)層。臨汾-運(yùn)城盆地位于鄂爾多斯盆地中生代富烴凹陷的東延部分之上,因此對(duì)該地區(qū)中生界進(jìn)行油氣資源分析具有實(shí)際意義。根據(jù)研究區(qū)的地質(zhì)特點(diǎn)和勘探資料實(shí)際情況,本文采用改造型盆地原盆恢復(fù)的思路,重點(diǎn)對(duì)臨汾-運(yùn)城盆地周緣殘留中生界進(jìn)行系統(tǒng)觀測(cè),通過(guò)地層對(duì)比、沉積相與物源分析、后期改造分析等,確定中生代主要時(shí)期的沉積相與盆地沉積范圍。在此基礎(chǔ)上結(jié)合最新收集的鉆孔資料,推斷新生界基巖地層的時(shí)代與展布。對(duì)臨汾-運(yùn)城盆地前新生界資源潛力進(jìn)行了初步探討。區(qū)域地層對(duì)比認(rèn)為,山西地區(qū)中-上三疊統(tǒng)銅川組、延長(zhǎng)組與今鄂爾多斯盆地延長(zhǎng)組對(duì)應(yīng)；下-中侏羅統(tǒng)大同組、云岡組、天池河組,分別與鄂爾多斯盆地延安組、直羅組、安定組對(duì)應(yīng)。中-上三疊統(tǒng)銅川組、延長(zhǎng)組在山西地區(qū)厚度為280-620m,具有南厚北薄、南細(xì)北粗的特點(diǎn),與鄂爾多斯盆地同時(shí)期地層在南北厚度差異及巖性特征上具有一致性。沉積相類型白下而上可識(shí)別出辮狀河、曲流河、三角洲等,未見邊緣相沉積。山西地區(qū)下-中侏羅統(tǒng)各組地層南北變化較大。北部大同、寧武-靜樂(lè)盆地發(fā)育全,永定莊組、大同組、云岡組及天池河組均有沉積,厚度650-950m,中-南部榆社、洪洞一帶僅殘留云岡組、天池河組,厚度250-550m；可識(shí)別出沖積扇、辮狀河、曲流河等沉積類型。大同組白北而南由含煤性好的三角洲沉積,變?yōu)楹盒圆畹暮喑练e。云岡組底部沖積扇沉積自北而南逐漸變薄,礫巖礫徑減小,表明北部接近物源區(qū)。結(jié)合區(qū)域地質(zhì)研究和對(duì)汾渭地塹邊緣擠壓構(gòu)造變形現(xiàn)象的分析,認(rèn)為臨汾-運(yùn)城盆地三疊紀(jì)-中侏羅世沉積之后,在晚侏羅世遭受過(guò)顯著的區(qū)域性擠壓和抬升事件,晚侏羅世沉積缺失。根據(jù)前人對(duì)鄂爾多斯盆地下白堊統(tǒng)的厚度恢復(fù),認(rèn)為臨汾-運(yùn)城盆地在早白堊時(shí)期仍可能接受沉積；但晚白堊世該地區(qū)以及西側(cè)的呂梁山、鄂爾多斯盆地均整體抬升,遭受剝蝕。新生代早期,受NE-SW向的剪切拉張作用,南部的運(yùn)城-關(guān)中地區(qū)于古新世晚期最早發(fā)生斷陷；而北部臨汾地區(qū)直到上新世才發(fā)生斷陷,接受沉積。綜合分析,恢復(fù)了中生代臨汾-運(yùn)城盆地主要時(shí)期的沉積面貌,認(rèn)為延長(zhǎng)組沉積期,臨汾-運(yùn)城盆地與鄂爾多斯盆地為統(tǒng)一大型沉積盆地,塔爾山陷隆以北為河流相、三角洲相為主,以南為湖相沉積；大同組沉積期,研究區(qū)內(nèi)主要為河流沼澤相、三角洲相等沉積類型,相比延長(zhǎng)組時(shí)期沉積范圍大幅度縮小；云岡組-天池河組沉積期,沉積邊界在臨汾-運(yùn)城盆地以東,太行山以西,研究區(qū)總體以沖積扇、河流相為主,該時(shí)期較大同組沉積時(shí)期范圍進(jìn)一步縮小。研究表明,中生代主要時(shí)期,臨汾-運(yùn)城盆地所在地區(qū)均有沉積,但由于后期擠壓和抬升構(gòu)造改造,致使現(xiàn)今斷陷內(nèi)部中生界殘存不全。依據(jù)最新收集的地?zé)岷退你@孔資料,編制了臨汾-運(yùn)城盆地前新生界分布圖,顯示僅在臨汾-洪洞地區(qū)深部地層為下-中三疊統(tǒng),另有小部分中-上侏羅統(tǒng),研究區(qū)普遍缺失延長(zhǎng)組、大同組同期地層。因此臨汾-運(yùn)城盆地中生界勘探潛力不容樂(lè)觀。雖然中生界潛在烴源層段在斷陷內(nèi)部幾乎沒(méi)有保存,但上古生界石炭-二疊系在斷陷深部大范圍保存,且近年來(lái)煤田勘探工作已證實(shí)具有工業(yè)開采價(jià)值的煤田,故臨汾-運(yùn)城盆地深部的石炭-二疊系具有形成煤型天然氣資源的物質(zhì)條件,值得進(jìn)一步研究。
[Abstract]:The Linfen Yuncheng basin, located in the southern part of Shanxi Province, is a Cenozoic fault basin superimposed on the North China Craton. Previous exploration and research showed that the Cenozoic fault subsidence time was new, the accumulation strata were thinner and the source rocks were not developed, so the potential of oil and gas resources under the Cenozoic basin was not in the past. The middle - late three - fold and early Middle Jurassic strata are the main hydrocarbon source beds and oil reservoirs in the Ordos Basin and its adjacent areas. The Linfen Yuncheng basin is located on the eastern part of the Mesozoic hydrocarbon rich sag in the Ordos Basin. Therefore, the analysis of the Mesozoic oil and gas resources in this area is of practical significance. On the basis of the geological characteristics and the actual exploration data, this paper uses the thought of the restoration of the original basin of the reformed basin, focusing on the systematic observation of the residual Mesozoic in the periphery of the Linfen Yuncheng basin, through the stratigraphic contrast, the analysis of the sedimentary and the material sources, and the later transformation analysis, to determine the sedimentary facies and the sedimentary range of the Mesozoic main period. Based on the newly collected borehole data, the age and distribution of the Cenozoic bedrock strata are deduced. The preliminary exploration of the potential of the pre Cenozoic resources in the Linfen Yuncheng basin is preliminarily discussed. The regional stratigraphic correlation holds that the middle upper three series of Tongchuan formation in the middle and upper strata of the Shanxi region is corresponding to the Yanchang Formation in the Ordos Basin, the lower middle Jurassic Datong formation, the Yungang formation, The Tianchi River formation, respectively, corresponds to the Yanan formation, the diazo group and the diazepam formation in the Ordos Basin, the middle upper three series Tongchuan formation, the Yanchang group is 280-620m in thickness in the Shanxi area, and has the characteristics of the South thicknesses and the southern thin north. The same period of the Ordos Basin is consistent with the thickness difference and lithology of the north and south. The upper and Middle Jurassic strata in Shanxi area have great changes. The northern Datong, the Ningwu - Jingle basin developed all, the Yongding Zhuang formation, the Datong formation, the Yungang formation and the Tianchi River formation, the thickness 650-950m, the middle - South Yushe, and Hongdong only residual Yungang formation. The Tianchi River group, with a thickness of 250-550m, can identify alluvial fan, braided river, and meandering river and other sedimentary types. The Datong group is deposited in a good coal bearing Delta in the north and south of the Datong group, and becomes a lacustrine deposit with poor coal property. The deposit of the bottom alluvial fan in the Yungang formation is thinning from the north to the South and the gravel diameter decreases. After the analysis of the tectonic deformation on the edge of the Fen Wei graben, it is believed that after the Triassic to Middle Jurassic deposits in the Linfen Yuncheng basin, there were significant regional extrusion and uplift events in the late Jurassic, and the late Jurassic deposition was missing. According to the thickness of the lower Cretaceous in the Ordos Basin, the Linfen Yuncheng basin was considered to be in the basin. The early Cretaceous may still be deposited in the early Cretaceous, but in the late Cretaceous, the Ordos Basin on the west side and the Ordos Basin were all uplifted and eroded. The early Cenozoic was affected by the shear tension of NE-SW, and the early fault of the Yuncheng Guanzhong area in the southern part of the Guanzhong Area in the late Palaeocene, and the northern Linfen region was not broken until the Pliocene. The sedimentary features of the Mesozoic Linfen Yuncheng basin were restored. The sedimentary features of the Mesozoic Linfen Yuncheng basin were restored. The sedimentary period of the Yanchang formation was considered, the Linfen Yuncheng basin and Ordos Basin were the unified large sedimentary basins, the northern part of the taulshan trapping was the river facies, the delta facies was the main and the lake facies deposits in the south, the Datong formation period, the main study area main. The sedimentary types of river marshes and deltaic are equal, compared with the period of Yanchang formation, the sedimentary boundaries of Yungang formation and Tianchi River formation are in the east of Linfen Yuncheng basin, west of Taihang Mountain, alluvial fan and river facies in the study area, and the time period is further narrowed by the sedimentary period of the Datong group. In the main period of the Mesozoic era, the region of the Linfen Yuncheng basin was deposited, but due to the late extrusion and uplift structure transformation, the Mesozoic Mesozoic in the present fault depression was incomplete. According to the latest collected geothermal and hydrologic drilling data, the distribution map of the former Cenozoic in the Linfen Yuncheng Basin was compiled, showing that it was only deep in the Linfen Hongdong region. The Mesozoic in the Linfen Yuncheng basin is not optimistic about the potential of Mesozoic exploration in the Linfen Yuncheng basin, although the potential hydrocarbon source layer in the Mesozoic is hardly preserved within the fault, but the upper Paleozoic Carboniferous Permian is preserved in a large range of deep fault, and the upper Paleozoic Carboniferous Permian is preserved in a large range, and the upper Paleozoic Carboniferous Permian is preserved in a large range. In recent years, coal field exploration has confirmed the coal field with industrial exploitation value, so the Carboniferous Permian in the deep part of the Linfen Yuncheng basin has the material conditions for forming coal type natural gas resources. It is worth further study.

【學(xué)位授予單位】：西北大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P618.13

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