致密砂岩气田储量分类及井网加密调整方法——以苏里格气田为例

发布时间：2018-04-16 13:14

本文选题：致密砂岩气 + 苏里格气田　；参考：《石油学报》2017年11期

【摘要】：苏里格气田是中国致密砂岩气田的典型代表,其储层物性差,有效砂体规模小,分布频率低,非均质性强,区块之间差异明显。依靠600 m×800 m的主体开发井网难以实现储量的整体有效动用,采收率仅约30%,需要开展储量分类评价,针对各类储量区分别实施井网加密调整。优选气田中部苏14区块为研究区,通过密井网区精细解剖、干扰试井分析明确了储层的发育频率及规模;以沉积相带为约束,结合储量丰度值、储层叠置样式、差气层影响和生产动态特征,将气田储量分成5种类型。从I类—V类,储层厚度减小,连续性变差,储量品位降低,单井产量变低。依据密井网实际生产数据与数值模拟结果,针对各储量类型,研究了井网密度、干扰程度和采收率的关系,论证了合理井网密度下的单井开发指标。在现有的经济及技术条件下,各类储量区合适井网密度为2~4口/km2,气田最终采收率约为50%。通过系统研究确定了致密砂岩气田复杂地质条件下的储量构成,为开发中后期加密调整方案的编制提供了地质依据。
[Abstract]:Sulige gas field is a typical representative of tight sandstone gas field in China. Its reservoir physical property is poor, the effective sand body scale is small, the distribution frequency is low, the heterogeneity is strong, and the difference between blocks is obvious.Depending on 600m 脳 800m main development well pattern, it is difficult to realize the effective production of reserves as a whole, and the recovery factor is only about 30. It is necessary to carry out the classification evaluation of reserves, and to carry out well pattern infilling adjustment for various reserve areas respectively.Su14 block in the central part of Youxuan gas field is the research area. Through fine anatomy of dense well pattern area, interference well test analysis makes clear the development frequency and scale of reservoir, taking sedimentary facies belt as constraint and combining reserves abundance value, reservoir stacking pattern,The gas reserves are divided into five types by the influence of the differential gas reservoir and the production characteristics.From class I to class V, reservoir thickness decreases, continuity becomes worse, reserves grade decreases, and single well production decreases.According to the actual production data and numerical simulation results of dense well pattern, the relationship among well pattern density, interference degree and recovery factor is studied according to each reserve type, and the development index of single well under reasonable well pattern density is proved.Under the existing economic and technical conditions, the suitable well pattern density in various reserve areas is 2 ~ 4 / km ~ (2), and the final recovery factor of the gas field is about 50.Through systematic study, the reserve composition of tight sandstone gas field under complicated geological conditions is determined, which provides geological basis for the compilation of infill adjustment scheme in the middle and late stage of development.
【作者单位】：中国石油勘探开发研究院;
【基金】：国家重大科技专项“致密气富集规律与勘探开发关键技术”(2016ZX05047)资助
【分类号】：P618.13

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