本文選題：武隆地區(qū)　切入點(diǎn)：五峰-龍馬溪組　出處：《成都理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：本文以川東南武隆地區(qū)上奧陶統(tǒng)五峰組-下志留統(tǒng)龍馬溪組頁(yè)巖為研究對(duì)象,選取武隆及鄰區(qū)典型露頭剖面進(jìn)行測(cè)量、描述、取樣,并通過(guò)巖礦薄片、X-射線衍射全巖分析,以及有機(jī)碳、熱解、氯仿瀝青、干酪根碳同位素、瀝青反射率等地球化學(xué)分析,結(jié)合對(duì)前人相關(guān)地質(zhì)資料的收集分析,系統(tǒng)研究了五峰-龍馬溪組頁(yè)巖的巖石類型、展布發(fā)育特征、沉積相、烴源巖特征等頁(yè)巖氣資源條件,取得以下成果和認(rèn)識(shí):1.通過(guò)野外觀察、薄片鑒定和X-射線衍射全巖分析,研究區(qū)五峰-龍馬溪組黑色頁(yè)巖可劃分為四種類型:(1)黑色炭質(zhì)頁(yè)巖,污手,主要分布于五峰組底部;(2)黑色、灰黑色硅質(zhì)頁(yè)巖,含筆石化石,厚度大,硬度高,主要發(fā)育于五峰組上部;(3)黑色頁(yè)巖,主要分布于龍馬溪組下部,含筆石化石;(4)粉砂質(zhì)頁(yè)巖,主要發(fā)育于龍馬溪組上部。頁(yè)巖礦物組分以石英和粘土礦物為主,其次為鈉長(zhǎng)石和微斜長(zhǎng)石,個(gè)別樣品見(jiàn)白云石、方解石、黃鐵礦,粘土礦物以云母為主,其次為伊利石和石膏。2.根據(jù)巖石類型、沉積構(gòu)造、沉積巖石組合等相標(biāo)志分析,區(qū)內(nèi)五峰-龍馬溪組可劃分出淺水陸棚和深水陸棚兩類沉積相,沉積相控制著頁(yè)巖類型及其分布。該區(qū)五峰組主要為一套混積深水陸棚相沉積,巖性主要為硅質(zhì)巖、炭質(zhì)頁(yè)巖,局部為硅質(zhì)頁(yè)巖與砂質(zhì)頁(yè)巖互層狀沉積;龍馬溪組下部為一套泥質(zhì)深水陸棚相沉積,巖性主要為黑色頁(yè)巖,局部含砂質(zhì),向上部則過(guò)渡為砂泥質(zhì)淺水陸棚相沉積,巖性以粉砂質(zhì)頁(yè)巖為主。3.通過(guò)露頭剖面、鉆井資料及沉積相研究認(rèn)為,該區(qū)五峰-龍馬溪組頁(yè)巖分布具有以下規(guī)律:(1)黑色頁(yè)巖主要發(fā)育于呈南西-北東向展布的觀音橋-武隆-焦石壩-漆遼菱形區(qū)域;(2)兩個(gè)黑色頁(yè)巖厚度較大的區(qū)域分別為焦石壩-黃鶯-巴魚-觀音橋(A帶)、漆遼-彭水-秀山(B帶);(3)漆遼-武隆黃鶯-焦石壩-道真巴魚-綦江觀音橋一帶可能為該區(qū)五峰-龍馬溪期的沉降中心,水體相對(duì)較深,有利于有機(jī)質(zhì)富集保存。4.通過(guò)有機(jī)地球化學(xué)測(cè)試分析表明,區(qū)內(nèi)五峰-龍馬溪組頁(yè)巖有機(jī)質(zhì)含量總體較高,TOC含量為0.55~10.38%,焦石壩-黃鶯-巴魚-觀音橋一帶頁(yè)巖有機(jī)質(zhì)含量最高,整體呈現(xiàn)自西向東有機(jī)質(zhì)含量減少的趨勢(shì)。有機(jī)顯微組分、族組成及干酪根δ13Corg分析表明,五峰-龍馬溪組黑色巖系沉積有機(jī)質(zhì)母質(zhì)為以菌藻類等低等浮游生物為主的腐泥型烴源巖,龍馬溪組出現(xiàn)少量植物混入;五峰組頁(yè)巖主要富含Ⅰ型有機(jī)質(zhì),龍馬溪組以Ⅰ型有機(jī)質(zhì)為主,含有Ⅱ1型有機(jī)質(zhì)。頁(yè)巖甾萜烷、芳烴標(biāo)志物及Pr/Ph分析結(jié)果表明,五峰-龍馬溪組頁(yè)巖有機(jī)質(zhì)母質(zhì)形成于具有一定鹽度的海水中,總體為較強(qiáng)的還原環(huán)境,且不同時(shí)期不同地區(qū)水體深度有所差異。有機(jī)質(zhì)成熟度測(cè)試分析表明,五峰-龍馬溪組頁(yè)巖等效鏡質(zhì)體反射率為1.15%~3.06%,平均2.01%,H/C為0.52~0.65,大部分樣品達(dá)到高成熟階段,部分為過(guò)成熟階段。5.綜合巖石學(xué)特征、沉積相、有機(jī)地球化學(xué)特征等分析認(rèn)為,川東南武隆地區(qū)五峰-龍馬溪組黑色頁(yè)巖有利發(fā)育層段為五峰組及龍馬溪組下部,有利發(fā)育區(qū)帶為焦石壩、武隆一帶,有機(jī)質(zhì)含量普遍大于2%,有機(jī)質(zhì)類型好、熱演化程度高并具有高脆性特征,頁(yè)巖氣資源前景良好。
[Abstract]:Ordovician group based on the five peak in Southeast Sichuan Wulong area on the Lower Silurian Longmaxi shale as the research object, selects typical outcrop section of Wulong and adjacent areas were measured, description, sampling, and through the rock wafer, X- ray diffraction analysis of whole rock, and organic carbon, pyrolysis, chlorine asphaltlike. The kerogen carbon isotope geochemical analysis, bitumen reflectance, combined with analysis of previous geological data collection system of the five peak - Longmaxi shale rock types, distribution characteristics, sedimentary facies, source rocks such as shale gas resources conditions, conclusions are as follows: 1. by field observation X-, thin section identification and X-ray diffraction analysis of whole rock, five peak of longmaxiformation shale can be divided into four types: (1) black carbonaceous shale, dirty hands, mainly distributed in the bottom of town group; (2) black, gray and black siliceous shale, containing graptolite fossils, thick Large, high hardness, mainly developed in the upper part of town group; (3) black shale, mainly distributed in the lower part of Longmaxi, containing graptolite fossils; (4) silty shale, mainly developed in the upper part of Longmaxi shale. Mineral components in quartz and clay minerals, followed by albite and micro individual samples of plagioclase, calcite, pyrite, see dolomite, clay mineral mica, illite and gypsum followed by.2. according to the rock type, sedimentary structure, sedimentary rock facies signs analysis, region five peak - Longmaxi formation can be divided into shallow water and deep water shelf shed two types of sedimentary facies, sedimentary facies control a shale type and its distribution. The five peak group in this area is mainly a set of hunji deep shelf facies, lithology is mainly siliceous rocks, carbonaceous shale, siliceous shale and local sandy shale interbedded deposition; the lower part is a set of longmaxiformation shale deep shelf facies, The lithology is mainly composed of black shale, containing local to the upper transition to sandy, muddy and sandy shallow shelf facies, lithology in silty shale mainly through.3. outcrops, drilling data and sedimentary facies study, five peaks - the Longmaxi shale distribution has the following rules: (1) black shale mainly developed in the a SW-NE trending Guanyin Bridge - Wulong - coke dam - paint Liaoning diamond region; (2) two black shale thickness region were larger coke dam - Pakistan fish Oriole (A band) - Guanyin Bridge - Pengshui - Liaoning, Xiushan paint (B); (3) paint Liaoning Wulong Orioles - coke dam - Daozhenba fish - Qijiang Guanyin Bridge area may be five peak in the area of subsidence center Longmaxi period, relatively deep water, is conducive to the preservation of organic matter enrichment test by.4. organic geochemical analysis indicates that the region five peak - Longmaxi shale organic matter content is high the content of TOC is 0.5. 5~10.38%, along the shale content of organic matter in coke dam - Pakistan fish - Oriole Guanyin Bridge is the highest, from west to east to reduce the overall presentation of the content of organic matter. The trend of organic maceral group composition of kerogen, and delta 13Corg analysis showed that the five peak - Longmaxi black rock series of sedimentary organic matter in algae and bacteria etc. low plankton dominated sapropelic source rocks, Longmaxi small plant mixed with five peaks; shale mainly rich in type I organic matter, Longmaxi organic matter is mainly type I, II type 1 containing organic matter. The shale of sterane and terpane, aromatic markers and Pr/Ph analysis results show that the peak of five - Longmaxi shale rocks formed in the salinity of seawater, generally strong reducing environment, and the depth of water in different regions and different periods vary. Organic matter maturity test analysis showed that the five peak - Longmaxi shale equivalent vitrinite counter The emission rate is 1.15%~3.06%, an average of 2.01%, H/C 0.52~0.65, most of the samples reached the high mature stage, as part of.5. comprehensive petrology, sedimentary facies analysis of the mature stage, the organic geochemical characteristics that Southeast Sichuan Wulong area five peak - Longmaxi formation and black shale has five peaks and Longmaxi group the lower, favorable zone for coke dam, Wulong area, the content of organic matter is generally greater than 2%, the type of organic matter, high degree of thermal evolution and has high brittleness, good prospects of shale gas resources.

【學(xué)位授予單位】：成都理工大學(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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