摘要
苏里格地区上古气藏有效储层以透镜状为主,空间展布复杂,非均质性强,地质建模难度大。以投产时间较长、地质认识程度较高的苏6加密井区为例,探索形成了一套适用于苏里格气田的动、静态双重约束的有效储层建模方法。首先,以精细沉积相研究为基础,采用确定+随机的沉积相建模思路,建立更能体现储层内部非均质性的沉积相模型,主要用于约束其展布范围及走向;其次,对加密区单井进行生产动态分析,根据单井泄流长度、宽度等分层设置有效储层展布范围,并对其在空间展布的不确定性进行分析;最后,在沉积相模型的控制下对有效储层进行随机模拟,从而实现对有效储层建模的动、静态双重约束。综合分析认为,该方法所建有效储层模型符合地质认识,并与动态分析的井间连通关系吻合,与常规有效储层建模方法相比,所建模型生产历史拟合的一次拟合成功率提高了43%。
Upper Paleozoic gas reservoir in Sulige Gas Field has the typical “thick sand layer but thin effective reservoir” feature, effective reservoir is mainly lenticular, with complex spatial distribution, which increases the difficulty of geological modeling because of its reservoir heterogeneity. A new method of geological modeling aiming at this type of reservoir is put for- ward in the Su-6 infill drilling pilot based on both static and dynamic constraint. First, the facies model which can better reflect the heterogeneity of reservoir was established on the basis of fine sedimentary facies research controlled by both deterministic and stochastic modeling method. The facies model is a static constraint of reservoir distribution range and direction. Secondly, the uncertainty of effective reservoir spatial distribution was analyzed on the basis of statistics on the flow discharge of single well radius obtained from single well production performance analysis. Finally, in order to realize the random simulation of dynamic and static constraints on the effective reservoir, the distribution range of the effective reservoir was arranged under the control of sedimentary facies model and the radius of the single well flow discharge, and the space distribution probability of effective reservoir was given in each layer. Comprehensive analysis reveals that the effective reservoir model accords with the geological knowledge, and the dynamic analysis of the well connectivity very well. Compared with the conventional methods of effective reservoir modeling, success rate of production history matching increased by 43 %.
出处
《西南石油大学学报（自然科学版）》
CAS
CSCD
北大核心
2015年第1期44-50,共7页
Journal of Southwest Petroleum University(Science & Technology Edition)
基金
国家重大科技专项(2011ZX05013–002)
关键词
有效储层
地质建模
沉积相
动态约束
苏里格气田
不确定性评价
生产历史拟合
effective sandstone reservoir
reservoir geological modeling
sedimentary facies
dynamic constraint
Sulige GasField
evaluation of the uncertainty
production history fitting
