【摘要】：探討四川盆地東南部下志留統(tǒng)小河壩組砂巖形成優(yōu)質(zhì)儲(chǔ)層的控制因素及形成機(jī)制。以野外剖面測(cè)量為基礎(chǔ),通過孔滲分析、薄片鑒定、陰極發(fā)光及掃描電鏡等手段,結(jié)合前人的研究成果,對(duì)小河壩組海相碎屑巖的儲(chǔ)層形成機(jī)制進(jìn)行分析。認(rèn)為沉積微相控制了儲(chǔ)層形成的先決條件,水下分流河道和遠(yuǎn)砂壩主要沉積了一套粉砂巖,具有形成儲(chǔ)層的先天條件;而分流間灣主要沉積了一套泥巖或粉砂質(zhì)泥巖,不能形成儲(chǔ)層。生烴中心對(duì)小河壩組儲(chǔ)層具有重要的控制作用,砂巖中瀝青的含量與生烴中心的距離具有明顯的負(fù)相關(guān)性。巖性在縱向上的疊置關(guān)系也是影響儲(chǔ)層形成的重要因素,具有砂泥互層的地層結(jié)構(gòu),因砂巖不易壓實(shí)和膠結(jié),可形成相對(duì)較好的儲(chǔ)層;而厚層的砂巖因壓實(shí)和膠結(jié)作用嚴(yán)重,反而難以形成好的儲(chǔ)層。
[Abstract]:The controlling factors and formation mechanism of high quality reservoir formation of Lower Silurian Xiaoheba formation in southeastern Sichuan Basin are discussed. On the basis of field profile measurement, the reservoir formation mechanism of marine clastic rock in Xiaoheba formation is analyzed by means of porosity and permeability analysis, thin slice identification, cathodoluminescence and scanning electron microscope, combined with previous research results. It is considered that sedimentary microfacies control the prerequisites for reservoir formation, and a set of siltstone is mainly deposited in underwater shunt channel and far sand bar, which has the innate conditions for reservoir formation. The shunt bay mainly deposits a set of mudstone or silty mudstone, which can not form reservoir. The hydrocarbon generation center plays an important role in controlling the reservoir of Xiaoheba formation, and the content of asphalt in sandstone is negatively correlated with the distance of hydrocarbon generation center. The vertical superposition relationship of lithology is also an important factor affecting reservoir formation. It has the formation structure of sand and mud interlayer. Because sandstone is not easy to compaction and cement, it can form a relatively good reservoir. However, thick sandstone is difficult to form a good reservoir because of its serious compaction and cement formation.
【作者單位】： 中國(guó)石化勘探分公司;油氣藏地質(zhì)及開發(fā)工程國(guó)家重點(diǎn)實(shí)驗(yàn)室(成都理工大學(xué));
【基金】：國(guó)家科技重大專項(xiàng)(2016ZX05002-004-004)
【分類號(hào)】：P618.13

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