本文選題：致密儲(chǔ)層　切入點(diǎn)：沉凝灰?guī)r　出處：《南京大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：在近年的石油勘探和開發(fā)中,致密油藏倍受重視。二連盆地阿南凹陷也有較好的致密油顯示,但該區(qū)域致密油勘探程度較低,存在巖石類型不明確、成藏機(jī)理不清楚等問題。本文通過鉆井巖芯觀察、巖石薄片鑒定、電子探針、掃描電鏡及稀土元素分析等方法,并結(jié)合地球物理資料對二連盆地阿南凹陷騰格爾組一段下部展開了巖石學(xué)和石油地質(zhì)學(xué)方面的研究。騰格爾組一段下部地層以深灰色云質(zhì)泥巖、灰色泥質(zhì)云巖、灰綠色塊狀凝灰?guī)r、鈣質(zhì)沉凝灰?guī)r、鈣質(zhì)細(xì)砂巖為主,其中鈣質(zhì)沉凝灰?guī)r和鈣質(zhì)細(xì)砂巖為儲(chǔ)層。和其它巖石樣品相比,沉凝灰?guī)r重稀土虧損的特點(diǎn),這是由凝灰質(zhì)受地層流體的溶蝕作用所致。地層流體有利于次生孔隙的發(fā)育,能夠提高沉凝灰?guī)r的儲(chǔ)油物性。阿南凹陷騰格爾組一段下部沉積主體為淺湖暗色泥巖,此外還發(fā)育有近岸水下扇。沉凝灰?guī)r和河道砂巖即為近岸水下扇沉積。該段地層中等及以上烴源巖發(fā)育,但成熟度普遍較低,湖盆中心烴源巖的Ro最高能達(dá)0.95%。油氣二次運(yùn)移的主要通道為不整合面和斷層面,油氣的垂向運(yùn)移能力較差。沉凝灰?guī)r呈透鏡狀?yuàn)A于云質(zhì)泥巖中,云質(zhì)泥巖既是生油巖又是蓋層,形成了透鏡體油藏。河道砂巖主要形成了巖性-地層油藏,上覆泥巖為其蓋層,油氣主要來自于下部的烴源巖。
[Abstract]:In recent years, dense reservoirs have been paid more attention to in petroleum exploration and development. There is also a good indication of tight oil in Anan sag of Erlian Basin, but the exploration degree of dense oil in this area is relatively low, and the rock types are not clear. The mechanism of reservoir formation is not clear. In this paper, the methods of drilling core observation, rock sheet identification, electron probe, scanning electron microscope and rare earth element analysis are used. Combined with geophysical data, the petrology and petroleum geology of the lower part of Tengger formation in Anan sag, Erlian Basin, are studied. The lower part of the formation is composed of dark gray cloud-like mudstone and gray muddy dolomite. Greyish green tuff, calcareous tuff, calcareous fine sandstone, in which calcareous tuff and calcareous fine sandstone are reservoirs. This is caused by the dissolution of the tuff, which is favorable to the development of secondary pores and can improve the oil storage properties of the tuff. The lower part of the Tengger formation in the Anan sag is composed of shallow lake dark mudstone. In addition, there are also nearshore subaqueous fans. Sedimentary tuff and channel sandstone are subaqueous fan deposits on the shore. The source rocks of medium and above strata are developed in this section, but the maturity is generally low. The maximum Ro energy of source rock in the center of lake basin is 0.95.The main channel of secondary migration of oil and gas is unconformity surface and fault plane, and the vertical migration ability of oil and gas is poor. The sedimentary tuff is lenticular in the dolomite mudstone, which is not only oil source rock but also caprock. The channel sandstone mainly forms lithology-stratigraphic reservoir, the overlying mudstone is its caprock, and the oil and gas mainly come from the source rock of the lower part.
【學(xué)位授予單位】：南京大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P618.13

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

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本文編號：1604022