基于熵权法的储层非均质性定量评价——以珠江口盆地A油田为例

发布时间：2018-12-07 08:58

【摘要】：珠江口盆地流花礁灰岩油藏的储集条件复杂、非均质性强。综合珠江口盆地A油田地震、测井、沉积和地质等资料,分析其礁灰岩储层的沉积微相、隔夹层等对储层非均质性的影响;进而在相控条件约束下,利用熵权法对储层非均质性进行定量评价,并建立不同约束条件下的随机储层非均质综合评价模型。实例研究结果显示,该方法可以定量表征储层质量参数和几何形态参数;综合储层非均质综合评价模型与油藏动态资料,确定研究区储层非均质综合指数为0.5~0.7的区域为剩余油分布潜力区,且剩余油主要富集于研究区礁体西北翼、东南翼以及靠近西南翼断层的构造高部位。在剩余油分布潜力区部署9口水平井,均获得较高的平均日产油量,与ODP设计日产油量相比,提高至少50 m~3/d,且平均含水饱和度上升较缓慢,剩余油分布潜力区具有较长的稳产时间。因此,利用熵权法对礁灰岩储层非均质性进行定量评价的结果基本可以表征其储层的非均质特征。
[Abstract]:The reservoir conditions of Liuhua reef limestone reservoir in Pearl River mouth basin are complex and heterogeneity. Based on seismic, logging, sedimentary and geological data of A Oilfield in Pearl River mouth Basin, the influence of sedimentary microfacies and intercalation on reservoir heterogeneity is analyzed. Furthermore, the entropy weight method is used to quantitatively evaluate the reservoir heterogeneity under the constraint of facies control condition, and the comprehensive evaluation model of random reservoir heterogeneity under different constraints is established. The experimental results show that this method can quantitatively represent the reservoir quality parameters and geometric shape parameters. Based on the comprehensive evaluation model of reservoir heterogeneity and reservoir dynamic data, it is determined that the area of reservoir heterogeneity synthesis index of the study area is the potential area of residual oil distribution, and the remaining oil is mainly enriched in the northwest wing of reef body in the study area. Southeast wing and near southwest wing fault high position of structure. When 9 horizontal wells are deployed in the potential area of residual oil distribution, higher average daily oil production is obtained. Compared with the daily oil production designed by ODP, the daily oil production is increased by at least 50 mm3 / d, and the average water saturation increases slowly. The potential area of residual oil distribution has a long stable production time. Therefore, the results of quantitative evaluation of the heterogeneity of reef limestone reservoir by using entropy weight method can basically characterize the heterogeneity of the reef limestone reservoir.
【作者单位】：中海石油(中国)有限公司深圳分公司;
【基金】：国家科技重大专项“南海东部海域大中型油气田地质特征”(2011ZX05023-006-03)
【分类号】：P618.13

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