摘要
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。
Qigu formation in Zhongjian3 block of Fengcheng oilfield in Karamay belongs to the low resistivity heavy oil reservoir.Because of the edge and bottom water with large energy and the high degree of saturation intraformational bound water,the oil layer is difficult to identify by single method.The error will result in the disk of the reservoir exploitation.Some wells will be watered out when perforation occurs.Ten percent of oil wells have been closed because of high water cut.We developed a comprehensive identification method for accurate interpretation of acquifers,that is the cross plot of invasion factor and apparent self-potential difference.The corresponding cross plot is made based on oil test data in Zhongjian3 block.The result indicates that when invasion factor is less than 0.09 and apparent self-potential difference is less than-40mV,the formation is water bearing.Secondary interpretation is done in Zhongjian3 block by using the comprehensive identification method.Three intervals of oil layers interpreted before are identified as acquifers.Water packer is operated at 501.3m and water plugging is done in well DZ3378.After that,the water cut of this well dropped from 88.6% before to 73.1% now and cycle oil production raised by 1.5 times than before.And this new method is demonstrated correctly from the production data after the water plugging operation,which makes less error of acquiers instead of low resistivity oil layers.
出处
《中外能源》
CAS
2012年第4期68-71,共4页
Sino-Global Energy
关键词
低阻
稠油
油层识别
侵入因子
视自然电位差
low resistivity
heavy oil
oil layer identification
invasion factor
apparent self-potential difference
