海陆过渡相砂岩油藏特高含水期剩余油成因及分布——以珠江口盆地陆丰13-1油田为例

Origin and distribution of remaining oil in sandstone oil reservoir at extra-high water cut stage with the transitional fades sandstone oil reservoir——taking Lufeng 13-1 Oilfield, Pearl Mouth Basin as an example

从油井动态入手,结合由不同时期领眼井测井与剩余油饱和度测井组合成的时间推移测井成果,充分利用油藏数值模拟器对处于特高含水期的海陆过渡相砂岩油藏——陆丰13-1油田的2500油藏和2370油藏进行了综合研究。结果表明,不稳定分布的泥岩夹层或钙质层、合采井的层间干扰、储层非均质性、局部低井网控制程度是珠江口盆地的陆丰13-1油田特高含水期剩余油的主要成因;剩余油主要分布于底水未波及的死油区、低渗透层带及低渗透区、局部连续分布泥岩"屋檐"区和弱淹油砂体的"三明治"面包区。

The integrated study was conducted on the reservoir of transitional facies sandstone at extra-high water-cut stage, Zone 2500 and Zone 2370 of Lufeng 13-1 Oilfield by means of production performance analysis, time-lapse logging from pilot holes & RST logging,and also reservoir simulation. The main genesis for remaining oil gathering at Lufeng 13-1 Oilfield of Pearl Mouth Basin includes as follows: discontinuously developed shaly barrier or calcareous sandstone, interlayer interference of commingled completion intervals, reservoir heterogeneity and well-pattern partially poorly controlling. The remaining oil mainly locates in unswept area by bottom water,at the low permeability streak or low permeable area,below 'eaves' of local continuously developed shale zone and at bread part of 'Sandwich' of weakly watered out sandstone.