本文選題：六盤山地區(qū)及鄰區(qū) + 中上元古界�。� 參考：《西安石油大學(xué)》2015年碩士論文

【摘要】：六盤山地區(qū)及鄰區(qū)位于鄂爾多斯地區(qū)西南部,區(qū)內(nèi)中上元古界不整合覆蓋于呂梁運動固結(jié)的克拉通結(jié)晶基底之上,中上元古界分布廣泛,無明顯變質(zhì)。隨著國內(nèi)外中上元古界油氣藏及鄂爾多斯盆地西南緣崇信縣薊縣系瀝青的發(fā)現(xiàn),使得六盤山地區(qū)及鄰區(qū)中上元古界日益成為一個值得關(guān)注的油氣勘探領(lǐng)域。由于以往該區(qū)油氣勘探側(cè)重于中古生界,對該區(qū)中上元古界的各項研究甚少,致使對該區(qū)中上元古界的盆地構(gòu)造屬性認識存在分歧,研究十分薄弱。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、剖面實測,輔以分析測試,結(jié)合測井?dāng)?shù)據(jù)和地震大剖面等資料,對研究區(qū)中上元古界地層劃分與分布特征、構(gòu)造沉積特征及其演化進行了綜合研究。取得了以下認識:(1)綜合分析鋯石U-Pb年齡測試及前人研究成果的基礎(chǔ)上,確定黃旗口組屬于長城系,王全口組屬于薊縣系。(2)運用測井、地震及地化測試資料,結(jié)合野外觀察、鏡下鑒定等成果,對研究區(qū)中上元古界沉積相及沉積環(huán)境進行了分析,結(jié)果顯示:黃旗口組早期為裂谷期沖積扇相沉積,晚期變?yōu)楹恿?濱岸相沉積;王全口組為裂谷后的潮坪相沉積;正目觀組為濱海-冰川相沉積。(3)中新元古代,六盤山地區(qū)及鄰區(qū)大規(guī)模裂陷解體,區(qū)域整體處于地殼伸展的構(gòu)造背景,陸內(nèi)裂谷、陸緣裂谷的構(gòu)造組合為其基本特征,隨后發(fā)育了裂谷環(huán)境下的長城系黃旗口組和穩(wěn)定環(huán)境下的薊縣系王全口組。
[Abstract]:The Liupanshan area and its adjacent area are located in the southwest of Ordos area. The middle and upper Proterozoic unconformity covers the craton crystalline basement of Lv Liang movement consolidation, and the middle and upper Proterozoic is widely distributed without obvious metamorphism. With the discovery of middle and upper Proterozoic reservoirs at home and abroad and the discovery of Jixian system asphalt in Chongxin County southwest margin of Ordos Basin the Middle and Upper Proterozoic in Liupanshan area and its adjacent areas has become an increasingly noteworthy oil and gas exploration field. In the past, oil and gas exploration in this area focused on the Middle Paleozoic and there were few studies on the Middle and Upper Proterozoic in this area, which resulted in different understanding of the basin tectonic attributes of the Middle and Upper Proterozoic in this area, and the study was very weak. On the basis of systematical arrangement and summing up the previous research results, this paper classifies and distributes the middle and upper Proterozoic strata in the study area through field investigation, section measurement, analysis and test, well logging data and seismic large section. The tectonic sedimentary characteristics and their evolution are comprehensively studied. Based on the comprehensive analysis of zircon U-Pb age test and previous research results, it is determined that the Huangqikou formation belongs to the Great Wall system, and the Wangquankou formation belongs to Jixian system. The sedimentary facies and sedimentary environment of the middle and upper Proterozoic in the study area are analyzed under microscope. The results show that the Huangqikou formation was alluvial fan facies in the rifting period and fluvial shore-shore facies in the late stage; The Wangquankou formation is the tidal flat facies behind the rift and the Zhengmu formation is the littoral glacial facies deposit. (3) the Mesoproterozoic, the Liupanshan area and its adjacent area are disintegrated, and the whole area is located in the tectonic setting of crustal extension and intracontinental rift. The tectonic assemblage of the continental margin rift is its basic feature, and the Great Wall system of Huangqikou formation and the Jixian system of Wangquankou formation in stable environment are developed in the rift environment.
【學(xué)位授予單位】：西安石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P618.13;P548

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