本文選題：毛細(xì)管力 + 初次運(yùn)移��； 參考：《高校地質(zhì)學(xué)報(bào)》2017年02期

【摘要】：毛細(xì)管壓力差通常被認(rèn)為是油氣初次運(yùn)移及源內(nèi)成藏的重要?jiǎng)恿?但毛細(xì)管力驅(qū)動(dòng)油由小孔向大孔遷移的前提是巖石孔隙表面親水。文章結(jié)合東營(yíng)凹陷沙三中亞段成熟烴源巖內(nèi)砂體含油概率較低,且原油多非來自成熟源巖圍巖情況,對(duì)砂巖及頁巖的潤(rùn)濕性進(jìn)行了探討。東營(yíng)凹陷部分砂巖存在潤(rùn)濕性反轉(zhuǎn),與較高的非烴及瀝青質(zhì)含量的原油接觸,是砂巖潤(rùn)濕性反轉(zhuǎn)的主要原因;而泥頁巖烴源巖在大量生烴演化過程中,其整體潤(rùn)濕性也表現(xiàn)為中間潤(rùn)濕甚至親油性。潤(rùn)濕性改變導(dǎo)致毛細(xì)管壓力方向改變,初次運(yùn)移及源內(nèi)油藏成藏作用減弱甚至消失,是沙三中亞段成熟源巖內(nèi)砂體含油概率低的主要原因。據(jù)此認(rèn)為,對(duì)于高豐度的生烴早期階段的泥頁巖烴源巖,毛細(xì)管力作為初次運(yùn)移及源內(nèi)油藏成藏動(dòng)力的作用可能是有限的。
[Abstract]:Capillary pressure difference is generally considered to be an important driving force for primary migration of oil and gas and reservoir formation in source, but the premise of capillary pressure driving oil migration from micropore to macropore is hydrophilic on rock pore surface. In this paper, the wettability of sandstone and shale is discussed in the light of the low oil probability of the sand body in the mature source rock of the third member of the Middle Sha in Dongying Sag, and the fact that the crude oil does not come from the surrounding rock of the mature source rock. Wettability inversion exists in some sandstones in Dongying sag, and contact with crude oil with high non-hydrocarbon and asphaltene content is the main reason for wettability inversion of sandstone. Its overall wettability is also shown as intermediate wettability or even oil-friendly. The change of wettability leads to the change of capillary pressure direction, the primary migration and the weakening or even disappearance of reservoir formation in source, which is the main reason for the low oil content probability of sand body in mature source rocks of the middle part of Sha 3. It is concluded that for shale source rocks with high abundance in the early stage of hydrocarbon generation, the effect of capillary force as the primary migration and reservoir forming power in the source reservoir may be limited.
【作者單位】： 中國(guó)石化勝利油田分公司勘探開發(fā)研究院;西北大學(xué)地質(zhì)學(xué)系大陸動(dòng)力學(xué)國(guó)家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(41372129;41072096) 國(guó)家973課題(2014CB239101;2014CB239105) 中石化科技攻關(guān)項(xiàng)目(P15117)聯(lián)合資助
【分類號(hào)】：P618.13

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