本文選題：鄂爾多斯盆地中東部 + 馬家溝組　； 參考：《成都理工大學(xué)》2015年碩士論文

【摘要】：鄂爾多斯盆地廣泛分布薊縣系、寒武系、奧陶系碳酸鹽巖地層。自1989年發(fā)現(xiàn)風(fēng)化殼巖溶型氣田(靖邊大氣田)以來,碳酸鹽巖油氣勘探長期未取得實(shí)質(zhì)性進(jìn)展。近幾年,鄂爾多斯盆地碳酸鹽巖油氣勘探重新受到重視,在古隆起東側(cè)中組合取得了重大勘探突破(3000億方天然氣儲(chǔ)量),如蘇345等8口井獲日產(chǎn)百萬方以上高產(chǎn)氣流。在中組合勘探研究的啟示下,提出膏鹽巖下上古煤系烴源側(cè)向供烴成藏新認(rèn)識(shí),這一新認(rèn)識(shí)使我們認(rèn)識(shí)到膏鹽巖下白云巖儲(chǔ)層具有較好的烴源條件。因此,本文以《鄂爾多斯盆地下古生界碳酸鹽巖沉積演化與天然氣成藏地質(zhì)條件研究》項(xiàng)目為依托,以盆地中東部鹽下地區(qū)為研究對象,通過野外地質(zhì)調(diào)查,鉆井巖芯觀察,薄片鑒定、測試分析等技術(shù)手段,系統(tǒng)研究了研究區(qū)內(nèi)的沉積相展布規(guī)律、儲(chǔ)層特征以及鹽巖的發(fā)育特征,并進(jìn)行了儲(chǔ)層發(fā)育控制因素的相關(guān)研究,取得了以下幾點(diǎn)認(rèn)識(shí):對盆地中東部馬家溝組馬五6-馬五10小層沉積微相特征及沉積演化過程進(jìn)行了分析,認(rèn)為盆地中東部自東向西發(fā)育潮上云坪-潮間灰云坪-膏巖洼地(瀉湖)的環(huán)境。通過鉆井巖心觀察及室內(nèi)巖礦鑒定的分析結(jié)果,認(rèn)為鹽下地區(qū)發(fā)育(含)灰云巖、含膏云巖、泥微晶白云巖、殘余砂屑云巖、鮞粒白云巖、粉-細(xì)晶白云巖及馬鞍狀白云巖,并對它們的分布和特征進(jìn)行了研究,認(rèn)為其中粉-細(xì)晶白云巖和含膏云巖可以作為良好的儲(chǔ)集體。由于研究區(qū)馬家溝組白云巖地層時(shí)代老,地層經(jīng)歷成巖作用時(shí)間長,埋藏深,因此成巖作用較其它地層復(fù)雜。本文在分析區(qū)內(nèi)成巖演化過程后,認(rèn)為白云石化作用、溶蝕作用和去膏化作用具有建設(shè)性。壓實(shí)、壓溶作用,充填作用,重結(jié)晶作用,去白云石化作用不利于儲(chǔ)層發(fā)育。系統(tǒng)研究了鹽巖的分布規(guī)律,認(rèn)為鹽巖與儲(chǔ)層的分布受控于海平面的變化影響,海退期形成膏鹽巖,海進(jìn)期形成白云巖儲(chǔ)層,二者之間存在四種組合樣式。最后總結(jié)認(rèn)為,儲(chǔ)層的發(fā)育受沉積微相和白云石化作用、溶蝕作用的影響,潮間云坪為有利的微相類型。
[Abstract]:Jixian, Cambrian and Ordovician carbonate strata are widely distributed in Ordos Basin. Since the discovery of weathered crust karst gas field (Jingbian large gas field) in 1989, no substantial progress has been made in carbonate oil and gas exploration for a long time. In recent years, oil and gas exploration of carbonate rocks in Ordos Basin has received renewed attention, and a major breakthrough has been made in the middle assemblage on the eastern side of the paleouplift (300 billion square gas reserves, such as 8 wells such as Su 345 and so on, have been obtained with a daily production of more than one million square meters of high gas flow). On the basis of the inspiration of the middle assemblage exploration, a new understanding of the formation of lateral hydrocarbon supply hydrocarbon reservoir in the upper Paleozoic coal series of gypsum salt rock is put forward, which makes us realize that the dolomite reservoir under the gypsum salt rock has better hydrocarbon source conditions. Therefore, based on the project of Lower Paleozoic Carbonate Sedimentary Evolution and Natural Gas Reservoir formation Geological conditions in Ordos Basin, this paper takes the middle and eastern part of the basin as the research object, through the field geological survey, drilling core observation. By means of thin slice identification, test and analysis, the regularity of sedimentary facies distribution, reservoir characteristics and salt rock development characteristics in the study area are systematically studied, and the related research on the controlling factors of reservoir development is carried out. Some understandings have been obtained as follows: the sedimentary microfacies characteristics and sedimentary evolution process of the Ma-56-Ma 510 sublayer of the Majiagou formation in the central and eastern part of the basin have been analyzed. It is considered that the environment of Yunping-intertidal grey Yunping-gypsum depression (lagoon) is developed in the central and eastern part of the basin from east to west. Based on the results of drilling core observation and laboratory rock ore identification, it is considered that limestone, gypsum, mud-microcrystalline dolomite, residual sandstone, oolitic dolomite, silt-fine-grained dolomite and saddle dolomite are developed in the subsalt area. The distribution and characteristics of them are studied. It is considered that the powder-fine-grain dolomite and gypsum-bearing dolomite can be used as a good reservoir. Because the dolomite strata of Majiagou formation in the study area are old, the strata experienced diagenesis for a long time and deep burial, the diagenesis is more complicated than other strata. After analyzing the diagenetic evolution process in this area, it is considered that dolomitization, dissolution and demoulding are constructive. Compaction, pressure-dissolution, filling, recrystallization and dedolomitization are not conducive to reservoir development. The distribution of salt rock is studied systematically. It is considered that the distribution of salt rock and reservoir is controlled by the influence of sea level change, the salt rock is formed in the regressive period and dolomite reservoir is formed in the sea advance period, and there are four kinds of combination patterns between them. Finally, it is concluded that the reservoir development is affected by sedimentary microfacies, dolomitization and dissolution, and the intertidal cloud flat is a favorable microfacies type.
【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】：2015
【分類號】：P618.13

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