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克拉玛依风城油田重检3井区齐古组油藏为低阻、稠油油藏,存在能量较大的边底水,且层内束缚水饱和度较高,采用单一的测井识别方法识别油层难度高,容易产生误判,导致油藏开发风险大,部分井射孔即出水,高含水关井数占总井数的10%。提出了使用侵入因子与视自然电位差交会图来精细解释水层的综合判别法。根据重检3井区的试油数据,制作侵入因子与视自然电位差交会图版。结果显示,侵入因子小于0.09、视自然电位差小于-40mV时,显示为水层。采用综合判别法对重检3井区进行了二次解释工作,识别出原来解释为油层的3个层段为水层,对DZ3378井实施堵隔水,封隔器位于501.3m处。实施堵水后,该井含水由堵水前的88.6%下降至73.1%,周期产油量增加了1.5倍。视自然电位法减少了侵入带地层电阻率、泥浆滤液地层电阻率、孔隙度和岩电参数等因素对计算结果的影响,提高了油水层判别的相对精度,有效降低了误判率。
The Qigu Formation reservoir in the Weifang 3 Oilfield of Karamay is a low resistivity and heavy oil reservoir. There is a large amount of edge water with high energy, and the irreducible irreducible water in the layer has a single log identification method The reservoir is highly difficult and prone to misjudgment, leading to a high risk of reservoir development. Some of the wells are perforation-effluent, and the high-water cut-off wells account for 10% of the total wells. A comprehensive discriminant method is proposed to explain the water layer finely by using the cross-plot of the invasion factor and the natural potential difference. According to re-test 3 well test oil data, the invasion factor and the natural potential as the intersection of fair production version. The results show that the invasion factor is less than 0.09, depending on the natural potential difference is less than -40mV, the water layer. The comprehensive interpretation method is applied to the secondary interpretation work in the re-inspection 3 well area. It is identified that the three layers originally interpreted as oil layers are aquifers, and the DZ3378 well is plugged with water and the packer is located at 501.3m. After the implementation of water shutoff, the well water cut down from 88.6% before water cut to 73.1%, and the cycle oil production increased 1.5 times. The natural potential method reduces the influence of formation resistivity, formation resistivity of mud filtrate, porosity and rock electrical parameters on the calculation results, improves the relative accuracy of oil-water layer discrimination and effectively reduces the false positive rate.