APPLICATION OF GENERALIZED MATERIAL BALANCE CALCULATION TO PROGRESSING EXPLORATION AND DEVELOPMENT IN BZ OILFIELD, SHANAN SAG
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摘要:
渤海湾盆地沙南凹陷BZ油田沙一段生屑云岩主力含油储层投产后，发现实际生产特征与初始地质认识吻合度差，部分区块可能具有增储上产的潜力。通过利用油田生产动态资料，主要包括压力、产量及PVT实验等数据，采用广义物质平衡计算法识别出A4井区滚动勘探潜力最大。在此基础上，精细刻画生屑云岩沉积期古地貌和古生态环境特征并结合生屑云岩发育规律，预测了A4井区生屑云岩储层新的空间展布范围。实际钻探结果证实了储层预测的准确性，新增探明储量近400万t，保障了BZ油田的可持续发展和投资效益。该套方案对国内海上相似地质条件油田的滚动勘探开发具有借鉴意义。
Abstract:Since the major oil reservoir of the BZ Oilfield in the Shanan Sag, the bioclastic dolostone in the 1st Member of the Shahejie Formation, was put into production, there has been large contradiction between the actual production and the initial geological estimation. In some of the well areas, there is large potential to increase oil reserve and production. Based on the data from oil production performance, such as the data of pressure, output and PVT experiment, using the method of general material balance calculation, we found that the A4 well block has the largest rolling exploration potential.Through detailed description of palaeogeomorphology and paleo-ecological environment of the bioclastic dolostone in combination of the distribution pattern of the bioclastic dolostone reservoir, a new reservoir space distribution pattern of the bioclastic dolostone of A4 well block was established. The prediction is proved by the actual drilling results, and a newly proved reserve of nearly 4 million tons is identified, which will certainly ensure the sustainable development and investment profit of the BZ Oilfield. The solution is expected to be an example to be referred in progressing exploration and development in both the domestic and offshore oilfields under similar geological conditions.
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表 1 沙南凹陷BZ油田容积法与不同时间段广义物质平衡计算结果
Table 1. Calculation results of volumetric method and generalized material balance in different time
井区 容积法/(×104 m3) 广义物质平衡计算/(×104 m3) 相对误差/% 2014年 2016年 A1 23 23 23 0.00 A5 39 45 48 0.23 A6 32 59 60 0.88 A2S/A9 132 130 130 -0.02 A4 31 554 582 17.77 
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