本文選題：四川盆地 + 威遠構(gòu)造��； 參考：《成都理工大學(xué)》2017年碩士論文

【摘要】：作為中國天然氣工業(yè)的搖籃,威遠構(gòu)造燈影組氣藏(威遠氣田)的勘探對新中國初期的現(xiàn)代化天然氣工業(yè)的發(fā)展做出了重要的貢獻。威遠構(gòu)造是四川盆地規(guī)模最大的地表構(gòu)造,但其燈影組氣藏充滿度相對較低,含氣高度244m,綜合充滿度僅26.3%。對其原因,相關(guān)研究較少且并未取得一致認識。經(jīng)過近四十年的不斷勘探,2011年鄰區(qū)高石1井(高石梯-磨溪構(gòu)造)燈影組獲高產(chǎn)天然氣;次年8月,在磨溪8井在寒武系龍王廟組同樣獲高產(chǎn)氣流,從此揭開了四川盆地下古生界自1964年威遠氣田勘探成功后又一個重大發(fā)現(xiàn),研究表明威遠構(gòu)造和高石梯-磨溪構(gòu)造燈影組生儲蓋組合接近相似,高石梯-磨溪構(gòu)造燈影組卻為充滿度近似100%的特大型整裝氣田。結(jié)合威遠構(gòu)造實際地質(zhì)條件與國內(nèi)外油氣運移、氣煙囪等相關(guān)研究實例,依靠地表與地腹資料,地質(zhì)-地球物理-地球化學(xué)綜合研究方法,對氣藏低充滿度做出了合理解釋。(1)威遠構(gòu)造為現(xiàn)今四川盆地除川東高陡構(gòu)造外燈影組最高點,廣安→龍女寺→磨溪→高石梯→威遠構(gòu)造為喜馬拉雅期在區(qū)域隆升過程中形成的圈閉閉合度、溢出點海拔逐漸抬高的燈影組系列圈閉。四川盆地?zé)粲敖M天然氣存在大范圍長距離的差異聚集。(2)威遠地區(qū)在40Ma左右抬升形成現(xiàn)今構(gòu)造,為四川盆地內(nèi)地表除川東高陡構(gòu)造外唯一出露三疊系嘉陵江組、雷口坡組的區(qū)域。隆升剝蝕作用造成在威遠構(gòu)造核部形成了燈影組天然氣逸散的“天窗”。氣煙囪存在證據(jù)包括:(1)非烴氣體組分含量:組分百分比自下而上呈緩慢遞減趨勢;(2)壓力系數(shù):威遠構(gòu)造底部燈影組氣藏至最上部二疊系含氣層均為常壓;(3)同位素地球化學(xué):最具深源無機成因特征的Ar氣在上部二疊系其Ar~(40)/Ar~(36)比值仍高達2 855~5 222。氣煙囪效應(yīng)特征明顯。威遠構(gòu)造氣煙囪表明,現(xiàn)今盆地尺度內(nèi)燈影組天然氣長距離運移、調(diào)整和逸散過程仍在進行,四川盆地?zé)粲敖M氣藏仍處在動態(tài)成藏過程中。這一模式的關(guān)鍵是威遠地區(qū)隆升剝蝕與擠壓變形,在構(gòu)造核部形成了天然氣逸散的“天窗”,使威遠構(gòu)造成為四川盆地中西部區(qū)域燈影組天然氣逸散的主要通道。
[Abstract]:As the cradle of China's natural gas industry, the exploration of Weiyuan structure Dengying formation gas reservoir (Weiyuan gas field) has made an important contribution to the development of modern natural gas industry in the early stage of New China. Weiyuan structure is the largest surface structure in Sichuan basin, but the gas filling degree of Dengying formation gas reservoir is relatively low, the gas bearing height is 244 m, and the comprehensive filling degree is only 26.3%. There is little research on the causes and no consensus has been made. After nearly 40 years of continuous exploration, the Dengying formation of Gaoshi No. 1 well (Gaoshitian-Moxi structure) in the adjacent area obtained high natural gas in 2011, and in August of the following year, in Moxi well 8, it also obtained high gas flow in the Cambrian Longwangmiao formation. From then on, another important discovery of the Lower Paleozoic in Sichuan Basin since the successful exploration of Weiyuan gas field in 1964 shows that the Weiyuan structure is close to the assemblage of source, reservoir and caprock of the Dengying formation of Gaoshitian-Moxi structure. The Dengying formation of Gaoshi-Moxi structure is a super-large gas field with a full capacity of about 100%. Combined with the actual geological conditions of Weiyuan structure and related research examples of oil and gas migration and gas chimney at home and abroad, based on the data of the earth's surface and the earth's web, the comprehensive research method of geology, geophysics and geochemistry is used. The Weiyuan structure is the highest point of Dengying formation except for the high and steep structure in Sichuan basin. The Kuang'an Longnu Temple is a series of traps of Dengying formation, which is formed in the Himalayan period during the regional uplift, and the overflow point is gradually elevated in the Dengying formation. The natural gas of Dengying formation in Sichuan basin has a large range and long distance differential accumulation. The Weiyuan area is uplifted around 40Ma to form the present structure, which is the only area of Triassic Jialingjiang formation and Leikoupo formation in the inland surface of Sichuan basin except for the high steep structure in eastern Sichuan. The uplift and denudation resulted in the formation of a "skylight" of natural gas dissipation in the Weiyuan tectonic nucleus. Evidence of existence of gas chimney includes: 1) content of non-hydrocarbon gas components: the percentage of components is decreasing slowly from bottom to top; pressure coefficient: gas reservoir of Dengying formation at the bottom of Weiyuan structure to upper Permian gas reservoir are atmospheric pressure Jiao 3) isotopes Geochemistry: in the upper Permian, the ar gas with the characteristics of the most deep-source inorganic origin is still as high as 2855 / 5222. The characteristic of gas chimney effect is obvious. The Weiyuan structural gas chimney shows that the gas of Dengying formation is in the process of long distance migration, adjustment and dissipation in the present basin scale, and the gas reservoir of Dengying formation in Sichuan basin is still in the process of dynamic reservoir formation. The key of this model is uplift, denudation and compression deformation in Weiyuan area. The "skylight" of natural gas dissipation is formed in the structural core, which makes Weiyuan structure become the main channel of natural gas dissipation of the Dengying formation in the central and western Sichuan basin.
【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：P618.13

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