本文選題：渭河盆地 + 烴源巖評價�。� 參考：《長安大學(xué)》2015年碩士論文

【摘要】：渭河盆地是西南部的特提斯板塊系統(tǒng)、東南部環(huán)太平洋板塊系統(tǒng)和北部的歐亞板塊系統(tǒng)相輻合地帶,位于鄂爾多斯盆地南緣與秦嶺造山帶之間的一個新生代斷陷盆地。渭河盆地賦存多種具有工業(yè)價值的資源,如地?zé)崴⑸餁狻⒑夂徒饘俚V產(chǎn)等,是一個非常極具資源開發(fā)潛力和重大工業(yè)價值的沉積盆地。本文在分析前人研究成果和盆地基礎(chǔ)地質(zhì)資料的基礎(chǔ)上,通過對渭河盆地的基礎(chǔ)地質(zhì)和盆地構(gòu)造演化史的分析,地層劃分與對比、沉積相與砂體展布、儲層分析與研究、資源分布規(guī)律研究等綜合研究,對烴源巖進行評價,天然氣樣品的成分、成因進行了系統(tǒng)的綜合分析和研究。地化特征表明,張家坡組烴源巖有機質(zhì)豐度較高,達到差-中級別;有機質(zhì)類型主要為含腐殖腐泥型(Ⅱ1)和腐泥型(I)為主,類型較好;當(dāng)烴源巖埋深達到1845米時,Ro=0.597%,仍處于低成熟度階段,為成熟早期。烴源巖評價結(jié)果表明,渭河盆地有著良好的生油氣潛力。渭河盆地水溶氦氣以殼源氦為主,并有少量幔源氦加入。氦氣源巖主要為盆地基底與周緣的花崗巖,有高含量的鈾、釷及強放射性活度特征。氦氣以斷裂、低滲巖層和高滲砂巖層為運移通道,運移到儲集層成藏。高陵群組及藍田灞河組與上覆張家坡組形成的異常壓力封閉,有利于盆地內(nèi)富氦水溶氣的富集和保存。渭河盆地伴生氣存在四種天然氣類型,其中以生物氣,生物-熱催化過渡帶氣為主同時含有少量的無機氣和熱解氣。生物氣母質(zhì)來源同腐泥型和腐殖型有機質(zhì)有關(guān),熱解氣具有煤成氣的特征。渭南地區(qū)與咸陽地區(qū)伴生氣氣源巖年齡為下奧陶-寒武紀;西安地區(qū)伴生氣氣源巖年齡為奧陶紀。與渭河盆地固市凹陷具有同柴達木三湖地區(qū)生物氣相似的資源條件,通過計算生氣量發(fā)現(xiàn),固市凹陷張家坡組具有大型生物氣成藏的地質(zhì)條件。
[Abstract]:The Weihe basin is a Cenozoic faulted basin located between the southern margin of Ordos basin and the Qinling orogenic belt, which is a convergence zone between the Tethys plate system in the southwest, the Pacific plate system in the southeast and the Eurasian plate system in the north. There are many kinds of resources of industrial value in Weihe Basin, such as geothermal water, biogas, helium gas and metal minerals, etc. It is a sedimentary basin with great potential for resource development and great industrial value. Based on the analysis of previous research results and basic geological data of the basin, this paper analyzes the history of basic geology and structural evolution of the Weihe basin, stratigraphic division and correlation, sedimentary facies and sandbody distribution, reservoir analysis and study. Based on the comprehensive study of resource distribution law, the evaluation of hydrocarbon source rock, the composition and origin of natural gas samples are systematically analyzed and studied. The geochemical characteristics show that the organic matter abundance of the source rocks of Zhangjiapo formation is relatively high, and the organic matter types are mainly humic saprophytic mud type (鈪，

本文編號：1905908