本文選題：鄂爾多斯盆地東緣　切入點(diǎn)：下石盒子組　出處：《長江大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：鄂爾多斯盆地是一個(gè)大型的多旋回克拉通疊合盆地,構(gòu)造上處于中國沉積盆地分布的中帶,是我國天然氣勘探的重點(diǎn)和最具勘探潛力的盆地之一,亦是“西氣東輸”的骨干資源基地之一。本論文以沉積學(xué)、層序地層學(xué)、石油地質(zhì)學(xué)的理論為指導(dǎo),以鄂爾多斯盆地東部下石盒子組為研究對(duì)象,系統(tǒng)開展下石盒子組沉積體系研究,為鄂爾多斯盆地下石盒子組的進(jìn)一步油氣勘探提供重要的基礎(chǔ)地質(zhì)資料。研究區(qū)下石盒子組地層下石盒子組自下而上可劃分為盒8、盒7、盒6、盒5四個(gè)巖性段,以及上部與之整合接觸的上石盒子組底部盒4段和下部與之整合接觸的山西組頂部地層。根據(jù)前人研究成果,以及盆地地層發(fā)育特征及其沉積作用特點(diǎn),在下石盒子組識(shí)別出河流三角洲體系和湖泊體系,并結(jié)合盆地區(qū)域構(gòu)造背景和沉積演化特征,進(jìn)一步將研究區(qū)的三角洲劃分為辮狀河三角洲(盒8段)和曲流河三角洲(盒7段)兩種類型,并指出該類三角洲具有河控淺水型的特征,即在三角洲平原和前緣以分流河道和水下分流河道砂體為其主要骨架砂體,而于三角洲前緣河口壩、前緣席狀砂及遠(yuǎn)砂壩不太發(fā)育。在沉積相分析的基礎(chǔ)上,運(yùn)用高分辨率層序地層學(xué)理論,首先進(jìn)行了層序界面的識(shí)別及地層堆積疊加樣式的確定,進(jìn)而對(duì)鄂爾多斯盆地東緣下石盒子組進(jìn)行了高分辨率層序地層學(xué)劃分,在下石盒子組劃分出1個(gè)長期旋回、4個(gè)中期旋回、10個(gè)短期旋回,確定了相應(yīng)的下石盒子組的地層層序劃分方案。并分析了下石盒子組不同級(jí)次旋回層序發(fā)育特征、類型及成因特征。通過層序地層對(duì)比,建立了鄂爾多斯盆地東緣二疊系下二疊統(tǒng)下石盒子組等時(shí)層序地層對(duì)比格架,分析層序地層格架內(nèi)沉積體系的發(fā)育特征,歸納總結(jié)出下石盒子組湖泊-三角洲沉積模式。
[Abstract]:The Ordos Basin is a large polycyclic craton superimposed basin, which is located in the middle zone of sedimentary basins in China, and is one of the most important and potential basins for natural gas exploration in China. This paper is guided by the theories of sedimentology, sequence stratigraphy and petroleum geology, and takes the Lower Shihezi formation in the east of Ordos Basin as the research object. A systematic study of the sedimentary system of the Lower Shihezi formation was carried out. It provides important basic geological data for further oil and gas exploration of the Xiashihezi formation in Ordos Basin. The Lower Shihezi formation of the Lower Shihezi formation in the study area can be divided into four lithologic formations from the bottom to the top. As well as the upper part of the Upper Shihezi formation and the lower part of the Shanxi formation, which are in contact with the upper part of the Upper Shihezi formation and the lower part of the Shanxi formation, according to the previous research results, and the characteristics of the basin strata development and sedimentary processes, In the Lower Shihezi formation, the river delta system and the lake system are identified, and combined with the regional tectonic background and sedimentary evolution characteristics of the basin. The deltas in the study area are further divided into braided river deltas (Bo8 member) and meandering river deltas (Bo7 member), and it is pointed out that these deltas have the characteristics of fluvial shallow water type. That is to say, distributary channel and underwater distributary channel sand body are the main skeleton sand bodies in delta plain and front edge, but they are not very developed in delta front estuary dam, front mat sand bar and far sand bar. Based on the theory of high-resolution sequence stratigraphy, the identification of sequence interface and the determination of stratigraphic stacking superposition style are first carried out, and then the high-resolution sequence stratigraphy division of the Lower Shihezi formation in the eastern margin of Ordos Basin is carried out. In the lower Shihezi formation, there are 1 long cycle, 4 middle cycle and 10 short term cycles. The stratigraphic sequence division scheme of the lower Shihezi formation is determined, and the development characteristics of the different order cycles of the lower Shihezi formation are analyzed. Through sequence stratigraphic correlation, the isochronous sequence stratigraphic correlation framework of Lower Permian Lower Permian in the eastern margin of Ordos Basin is established, and the developmental characteristics of sedimentary system in sequence stratigraphic framework are analyzed. The lacustrine delta sedimentary model of the Lower Shihezi formation is summarized.
【學(xué)位授予單位】：長江大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：P618.13

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