【摘要】：隨著國內(nèi)外中上元古界油氣藏,尤其是鄂爾多斯盆地西南緣薊縣系瀝青和盆地北部伊盟隆起區(qū)長城系內(nèi)天然氣的發(fā)現(xiàn),使得鄂爾多斯地區(qū)中上元古界日益成為一個(gè)值得關(guān)注的潛在油氣勘探領(lǐng)域。鄂爾多斯地區(qū)地處華北克拉通西部,區(qū)內(nèi)中上元古界不整合覆蓋于呂梁運(yùn)動(dòng)固結(jié)的克拉通結(jié)晶基底之上。其分布廣泛,無明顯變質(zhì)。然而,以往油氣勘探側(cè)重于中古生界,對(duì)中上元古界的各項(xiàng)研究甚少,致使其研究十分薄弱。為搞清鄂爾多斯地區(qū)中上元古界油氣勘探潛力,本文在系統(tǒng)整理、總結(jié)前人研究成果的基礎(chǔ)上,通過野外考察、剖面實(shí)測(cè),輔以分析測(cè)試,結(jié)合測(cè)井?dāng)?shù)據(jù)、鉆井巖心和最新地震大剖面及重磁等資料,對(duì)研究區(qū)中上元古界地層劃分與分布特征、沉積相及其演化進(jìn)行了綜合研究,并預(yù)測(cè)有利勘探潛力區(qū)。取得了以下認(rèn)識(shí)：(1)在鋯石U-Pb年齡測(cè)試及前人研究成果分析基礎(chǔ)上,確定黃旗口組、汝陽群、海原群屬于長城系,王全口組屬于薊縣系,制定了鄂爾多斯盆地及其周緣中上元古界地層劃分與對(duì)比方案,繪制了長城系、薊縣系及震旦系分布圖。(2)運(yùn)用測(cè)井、地震及地化測(cè)試資料,結(jié)合野外觀察等成果,對(duì)研究區(qū)中上元古界沉積相及沉積環(huán)境進(jìn)行了分析,結(jié)果顯示：熊耳群為海陸交互沉積環(huán)境；高山河群為潮坪相沉積；黃旗口組為濱海-瀉湖相沉積；洛南群和王全口組為碳酸鹽臺(tái)地潮坪相沉積；白術(shù)溝組為濱海-淺海陸棚相；羅圈組和正目關(guān)組為濱海-冰川相沉積。(3)依據(jù)評(píng)價(jià)標(biāo)準(zhǔn),結(jié)合有機(jī)地化測(cè)試分析數(shù)據(jù),對(duì)盆地南緣中上元古界烴源巖及有利區(qū)進(jìn)行了評(píng)價(jià)：長城系和震旦系泥巖為差烴源巖,有一定生烴潛力；薊縣系海相碳酸鹽巖為差-中等烴源巖,具備一定生烴能力；白術(shù)溝組泥質(zhì)巖為非烴源巖。(4)結(jié)合中上元古界分布及成藏組合分析,劃分出油氣勘探有利區(qū),并將其劃分為上生下儲(chǔ)型、薊縣系自生自儲(chǔ)型及長城系自生自儲(chǔ)型3類。
[Abstract]:With the discovery of middle and upper Proterozoic oil and gas reservoirs at home and abroad, especially Jixian bitumen in the southwest margin of the Ordos Basin and natural gas in the Great Wall system in the Yimeng uplift area in the northern part of the basin, The Middle and Upper Proterozoic in Ordos area is becoming a potential oil and gas exploration field. Ordos area is located in the western part of North China craton, where the Middle and Upper Proterozoic unconformities cover the craton crystalline basement consolidated by Lv Liang movement. It is widely distributed and has no obvious metamorphism. However, in the past, oil and gas exploration focused on the Middle Palaeozoic, and few studies on the Middle and Upper Proterozoic have been made, which leads to the weak study of the Middle and Upper Proterozoic. In order to understand the oil and gas exploration potential of Middle and Upper Proterozoic in Ordos area, this paper, on the basis of systematical arrangement and summary of previous research results, through field investigation, profile measurement, analysis and test, combined with logging data, The classification and distribution characteristics, sedimentary facies and evolution of the Middle and Upper Proterozoic strata in the study area were comprehensively studied by drilling cores and the latest seismic profiles, gravity and magnetic data, and the favorable exploration potential areas were predicted. The following knowledge is obtained: (1) on the basis of zircon U-Pb age test and previous research results, the Huangqikou formation, Ruyang Group, Haiyuan Group belong to the Great Wall system and Wang Quankou formation belong to Jixian system. The division and correlation scheme of Middle and Upper Proterozoic strata in Ordos Basin and its periphery are drawn up, and the distribution maps of Great Wall system, Jixian system and Sinian system are drawn up. (2) using logging, seismic and geochemical test data and field observation, etc. The sedimentary facies and environment of the Middle Proterozoic in the study area are analyzed. The results show that Xionger Group is a sea-land interactive sedimentary environment; Gaoshanhe Group is tidal flat facies, Huangqikou formation is coastal-lagoon facies, Luonan Group and Wangchuankou formation are carbonate platform tidal flat facies, Baizhugou formation is coastal-shallow shelf facies, and Huangqiankou formation is coastal-lagoon facies, and Huangqankou formation is coastal-lagoon facies. The looping formation and Zhengmuguan formation are coastal-glacier facies sediments. (3) according to the evaluation criteria, combined with the organic geochemical test and analysis data, The middle and upper Proterozoic source rocks and favorable areas in the southern margin of the basin are evaluated. The mudstones of the Great Wall system and the Sinian system are poor source rocks with a certain hydrocarbon generation potential. Jixian marine carbonate rocks are poor-medium hydrocarbon source rocks, and have a certain hydrocarbon generation capacity. The mudstone of the Baizhugou formation is a non-hydrocarbon source rock. (4) combined with the distribution of the Middle and Upper Proterozoic and the analysis of the pool-forming assemblages, the favorable areas for oil and gas exploration are divided into three types: the upper generation and the lower reservoir type, the Jixian system self-generating type and the Great Wall system self-generating type.
【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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