發(fā)布時(shí)間：2018-01-23 02:10

  本文關(guān)鍵詞： 鄂爾多斯盆地 海相烴源巖 碳酸鹽巖 資源潛力 勘探新領(lǐng)域　出處：《石油學(xué)報(bào)》2016年08期 　論文類型：期刊論文

【摘要】：鄂爾多斯盆地油氣勘探已進(jìn)入儲(chǔ)量發(fā)現(xiàn)高峰期,圍繞延長(zhǎng)組烴源巖的石油資源和來(lái)自上古生界煤系地層的天然氣資源基本探明。隨著盆地油氣勘探的深入,急需尋找新的油氣勘探接替領(lǐng)域。研究認(rèn)為,古老海相烴源巖發(fā)育2套:即中上奧陶統(tǒng)海相碳酸鹽巖烴源巖系和中上元古界海相碎屑巖烴源巖系。中上奧陶統(tǒng)海相烴源巖在不同海域有不同的特征。中奧陶統(tǒng)海相烴源巖發(fā)育于盆地東部華北海臺(tái)內(nèi)鹽坳周邊,以泥灰?guī)r為主,單層厚度薄,但層系多,有機(jī)質(zhì)豐度差—中等,高成熟度,有規(guī)模生烴潛力,對(duì)奧陶系鹽下自源氣藏有重要貢獻(xiàn)。上奧陶統(tǒng)海相烴源巖主要發(fā)育于盆地西部和南部"L"型秦祁海槽斜坡相帶,以泥頁(yè)巖、泥灰?guī)r為主,有機(jī)質(zhì)豐度中等,累計(jì)厚度大,在天環(huán)凹陷上達(dá)到高—過成熟生氣階段,分布范圍有限,在盆地西緣逆沖帶上盤處于成熟生油階段,生烴潛力較大。而中上元古界海相泥巖烴源巖系在鄰區(qū)為有效烴源巖,以泥板巖為主,厚度大,有機(jī)質(zhì)豐度中等,高過成熟度。在盆地本部甘陜裂陷槽新鉆井中也有部分揭示。圍繞2套海相烴源巖系分布的奧陶系海相碳酸鹽巖和中上元古界深層海相層系是未來(lái)天然氣勘探的2個(gè)新領(lǐng)域,其中5個(gè)有利勘探區(qū)帶天然氣勘探潛力大,有望形成天然氣勘探接替區(qū)帶。
[Abstract]:The exploration of oil and gas in Ordos Basin has entered the peak of reserves discovery. The oil resources of source rocks and natural gas resources from the Upper Paleozoic coal measure strata have been basically proved around the source rocks of Yanchang formation. With the development of oil and gas exploration in the basin. It is urgent to find a new oil and gas exploration replacement field. 2 sets of ancient marine source rocks:. That is, the source rock series of marine carbonate rocks of middle and upper Ordovician and the source rock series of marine clastic rocks of middle and upper Proterozoic. The source rocks of marine facies of middle and upper Ordovician have different characteristics in different sea areas. The source rocks of marine facies of middle and upper Ordovician are developed in the eastern part of the basin. Around the salt depression in the Huabei platform. It is mainly mudstone with thin monolayer thickness, but there are many layers, organic matter abundance is poor-medium, high maturity, and has the potential of hydrocarbon generation on a large scale. The source rocks of the Upper Ordovician marine facies mainly developed in the "L" type Qinqi trough slope facies belt in the western and southern part of the basin, mainly composed of shale and marlite, with moderate organic matter abundance. The accumulative thickness is large, in Tianhuan sag the stage of high-over-mature gas generation is reached, the distribution range is limited, and the plate of thrust belt in the western margin of the basin is in the mature stage of oil generation. The source rocks of marine mudstone in the middle and upper Proterozoic are effective source rocks in the adjacent area, mainly of mudstone slate, with large thickness and moderate abundance of organic matter. The Ordovician marine carbonate rocks and the middle and upper Proterozoic deep marine facies strata around two sets of marine source rock series distribution are the future of natural gas exploration. 2 new areas. Among them, 5 favorable exploration zones have great potential for natural gas exploration, which is expected to form a natural gas exploration replacement zone.
【作者單位】： 中國(guó)石油勘探開發(fā)研究院;中國(guó)石油長(zhǎng)慶油田勘探開發(fā)研究院;
【基金】：國(guó)家重大科技專項(xiàng)(2011ZX05004-002) 中國(guó)石油天然氣集團(tuán)公司重大科技專項(xiàng)(2014E-3201)資助
【分類號(hào)】：P618.13
【正文快照】： 鄂爾多斯盆地是中國(guó)第二大沉積盆地,盆地面積約25×104km2。該盆地是一個(gè)穩(wěn)定沉降、坳陷遷移、扭動(dòng)明顯的多旋回沉積型克拉通類含油氣盆地,是中新生代和元古代—古生代的多元復(fù)合型沉積盆地。經(jīng)歷了中晚元古代陸緣裂谷盆地、早加里東期克拉陸表海盆地、晚加里東期秦祁海槽、海

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