【摘要】：三角洲外前緣亞相儲(chǔ)層井間連通性研究對(duì)于高含水期油田井網(wǎng)優(yōu)化和剩余油挖潛具有重要意義。以大慶長垣薩爾圖油田南二區(qū)東部為靶區(qū),利用122個(gè)時(shí)間單元的密井網(wǎng)資料,首先構(gòu)建出三角洲外前緣亞相儲(chǔ)層井間連通性定量評(píng)價(jià)模型,進(jìn)而開展不同砂地比和井距條件下的三角洲外前緣亞相儲(chǔ)層井間連通性定量評(píng)價(jià)。結(jié)果表明:(1)砂地比為評(píng)價(jià)儲(chǔ)層井間連通性的宏觀評(píng)價(jià)參數(shù),即存在一個(gè)"滲流閾值",當(dāng)砂地比低于滲流閾值時(shí),井間連通性不超過20%變?yōu)椴贿B通,當(dāng)砂地比達(dá)到滲流閾值后,井間連通性迅速增長至80%以上變?yōu)橥耆B通,整個(gè)過程反映的砂地比和井間連通性函數(shù)圖像呈S形曲線;(2)通過對(duì)砂體最大橫截面面積沿垂直于井鉆進(jìn)方向的投影和井距的空間耦合關(guān)系分析,建立了以井距為變量的三角洲外前緣亞相儲(chǔ)層井間連通概率模型,同時(shí)提出各微相砂體所占比例影響儲(chǔ)層井間連通性整體變化趨勢;(3)儲(chǔ)層井間連通性滲流閾值與井距呈正相關(guān),隨著井距變小,砂地比與井間連通性的S形曲線函數(shù)圖像趨于"線性",當(dāng)平均井距為70 m(1倍井距)條件下三角洲外前緣亞相儲(chǔ)層井間連通性的滲流閾值為0.20,平均井距為140 m(2倍井距)和210 m(3倍井距)條件下儲(chǔ)層井間連通性的滲流閾值分別為0.24和0.30。
[Abstract]:The study of inter-well connectivity of subfacies reservoirs in the outer front of delta is of great significance for the optimization of well pattern and the exploitation of remaining oil potential in high water-cut oil fields. Taking the eastern part of the south second area of Daqing Changyuan Saltu Oilfield as the target area, using the data of the dense well pattern of 122 time units, a quantitative evaluation model of inter-well connectivity of the delta outer front subfacies reservoir is constructed. Furthermore, quantitative evaluation of inter-well connectivity of delta outer front subfacies reservoir is carried out under different sand / soil ratio and well spacing. The results show that: (1) the sand / ground ratio is a macroscopic evaluation parameter for evaluating the reservoir inter-well connectivity, that is, there exists a "seepage threshold". When the sand to ground ratio is below the seepage threshold, the inter-well connectivity does not exceed 20% and becomes disconnected, when the sand to ground ratio reaches the seepage threshold, Cross-well connectivity grew rapidly to more than 80% and became fully connected. The images of sand / ground ratio and inter-well connectivity function reflected by the whole process are S-shaped curves. (2) the projection of the maximum cross-section area of sand body along the direction perpendicular to well drilling and the spatial coupling of well spacing are analyzed. The interwell connectivity probability model of delta outer front subfacies reservoir is established, and it is proposed that the proportion of microfacies sand bodies affects the overall variation trend of inter-well connectivity. (3) the reservoir inter-well connectivity percolation threshold is positively correlated with well spacing. As the well spacing becomes smaller, The S-shape curve function image of sand to ground ratio to inter-well connectivity tends to be "linear". When the average well spacing is 70 m (1 double well spacing), the percolation threshold of inter-well connectivity in delta outer front subfacies reservoir is 0.20, and the average well spacing is 140 m (2 times). The percolation thresholds of interwell connectivity are 0.24 and 0.30 under the conditions of 210m and 210m (3 times interval), respectively.
【作者單位】： 東北石油大學(xué)地球科學(xué)學(xué)院;大慶油田有限責(zé)任公司開發(fā)部;
【基金】：國家重大科技專項(xiàng)(2017ZX05001-003) 國家自然科學(xué)基金項(xiàng)目(No.41502136)資助
【分類號(hào)】：P618.13

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