本文選題：涪陵區(qū)塊 + 大二段��； 參考：《成都理工大學(xué)》2015年碩士論文

【摘要】：經(jīng)過(guò)近幾年的努力,我國(guó)四川盆地海相頁(yè)氣已取得了重大勘探突破,而陸相泥頁(yè)巖形成條件復(fù)雜,研究相對(duì)較少。四川盆地陸相烴源巖主要為中侏羅統(tǒng)千佛崖組和下侏羅統(tǒng)自流井組泥質(zhì)烴源巖、上三疊統(tǒng)煤系烴源巖。具有穩(wěn)定的泥頁(yè)巖分布,高有機(jī)質(zhì)豐度、厚度大等特點(diǎn),具有良好的頁(yè)巖氣成藏條件和巨大的勘探潛力。本文以“涪陵區(qū)塊下侏羅統(tǒng)自流井組頁(yè)巖氣形成條件分析及有利層系優(yōu)選”為題,利用野外剖面觀察、測(cè)量和巖心觀察以及泥頁(yè)巖有機(jī)地化分析、物性分析、X衍射分析、比表面分析、掃描電鏡等資料對(duì)涪陵下侏羅統(tǒng)自流井組富有機(jī)質(zhì)泥頁(yè)巖進(jìn)行詳細(xì)的分析,對(duì)頁(yè)巖氣富集條件進(jìn)行深入的研究,分析優(yōu)選出涪陵地區(qū)下侏羅統(tǒng)自流井組頁(yè)巖氣富集有利區(qū)域和有利層系。通過(guò)對(duì)涪陵下侏羅統(tǒng)自流井組頁(yè)巖氣富集條件研究,推動(dòng)四川盆地下侏羅統(tǒng)頁(yè)巖氣的研究和勘探。通過(guò)對(duì)對(duì)涪陵區(qū)塊下侏羅統(tǒng)自流井組的研究,明確了涪陵區(qū)塊下侏羅統(tǒng)有利的沉積微相為半深湖風(fēng)暴灘和半深湖泥;半深湖風(fēng)暴灘沉積微相巖性以深灰色泥頁(yè)巖與泥晶介屑灰?guī)r、介殼灰?guī)r不等厚互層為特征,半深湖泥沉積微相以黑色頁(yè)巖、泥灰?guī)r為特征,主要代表為涪陵大安寨段和東岳廟段;大安寨段分為大一段、大二段和大三段三個(gè)亞段。從涪陵地區(qū)陸相頁(yè)巖氣井沉積相柱狀圖得知涪陵大二段和東岳廟段發(fā)育較厚的暗色富有機(jī)質(zhì)泥頁(yè)巖,因此,涪陵下侏羅統(tǒng)自流井組研究重點(diǎn)為大二段和東岳廟段。據(jù)涪陵地區(qū)有機(jī)地化分析資料,大二段TOC平均1.33%,Ro平均值1.27%,處于成熟階段,生成濕氣為主,干酪根以Ⅱ2型為主;東岳廟段TOC平均1.78%,Ro平均值1.64%,處于高成熟階段,生成濕氣為主,干酪根以Ⅱ2型為主。據(jù)涪陵地區(qū)物性分析資料,大二段和東岳廟段儲(chǔ)滲空間主要由孔隙與裂縫構(gòu)成。孔隙類型主要包括粒間孔隙、晶間孔及少量有機(jī)質(zhì)孔。裂縫類型主要為微型裂縫,包括硬性礦物邊緣縫。其中納米級(jí)至微米級(jí)的微孔隙與微裂縫對(duì)于頁(yè)巖的孔滲發(fā)育、氣體的儲(chǔ)集與吸附起了重要的作用。涪陵地區(qū)大二段脆性礦物含量平均值為43.75%,東岳廟段脆性礦物含量平均值為43.9%,脆性礦物含量較高,可壓性好。同時(shí),涪陵地區(qū)陸相頁(yè)巖氣分布區(qū)域大多位于復(fù)向斜區(qū),具有構(gòu)造簡(jiǎn)單、穩(wěn)定,地層平緩,斷裂不發(fā)育,構(gòu)造、保存條件良好。根據(jù)頁(yè)巖氣形成條件與主控因素,涪陵大二段和東岳廟段生烴條件優(yōu)越,有機(jī)質(zhì)含量高,整個(gè)研究區(qū)分布廣泛,埋藏適中。從生烴條件、儲(chǔ)集條件、保存條件綜合分析優(yōu)選出涪陵區(qū)塊東北部為頁(yè)巖氣勘探開發(fā)的有利區(qū)域,東岳廟段為最優(yōu)層系,大二段次之。
[Abstract]:Through the efforts in recent years, great breakthrough has been made in marine gas exploration in Sichuan Basin, while the formation conditions of continental shale are complex and the research is relatively few. The source rocks of continental facies in Sichuan Basin are mainly shaly source rocks of Qianfoya formation of Middle Jurassic and Artesian well formation of Lower Jurassic and source rocks of coal series of Upper Triassic. It has the characteristics of stable shale distribution, high organic matter abundance and large thickness, and has good shale gas reservoir forming conditions and great exploration potential. Under the title of "formation conditions of shale gas and optimal selection of favorable strata in Lower Jurassic Artesian well formation in Fuling Block", field profile observation, measurement and core observation, organic geochemistry analysis of mud shale, physical property analysis and X-ray diffraction analysis are used in this paper. The specific surface analysis, scanning electron microscope and other data are used to analyze the organic matter rich shale of the Lower Jurassic in Fuling, and the enrichment conditions of shale gas are studied in depth. The favorable regions and strata of shale gas enrichment in the Lower Jurassic Artesian well formation in Fuling area are analyzed. Through the study of the accumulation conditions of shale gas in the Lower Jurassic of Fuling, the study and exploration of the shale gas of the Lower Jurassic in Sichuan Basin are promoted. The favorable sedimentary microfacies of the Lower Jurassic in Fuling block are semi-deep lake storm beach and semi-deep lake mud through the study of the Lower Jurassic Artesian well formation in Fuling block, and the results show that the favorable sedimentary microfacies of the Lower Jurassic in Fuling block are semi-deep lake storm beach and semi-deep lake mud. The sedimentary microfacies lithology of semi-deep lake storm beach is characterized by dark gray shale and shaly mesozoic limestone, interbedded with interlayer of meso-shell limestone of unequal thickness, while the sedimentary microfacies of semi-deep lake mud are characterized by black shale and marlite. The main representative is the Fuling Da-anzhai and Dongyemiao sections, which are divided into three subsections: the first, the second and the third. From the column map of sedimentary facies of continental shale gas wells in Fuling area, it is known that thick dark organic matter rich mud shale is developed in the Daxian member of Fuling and Dongyemiao section. Therefore, the research emphasis of the Artesian well formation of Lower Jurassic in Fuling is the Dag2 and Dongyemiao sections. According to the organic geochemical analysis data of Fuling area, the average value of TOC in the second stage of TOC is 1.33 and Ro is 1.27, and it is in the mature stage, mainly producing wet gas, and the kerogen is mainly type 鈪，

本文編號(hào)：2006818