加拿大白桦地致密气储层定量表征技术

以加拿大白桦地大型致密砂岩气田的研究为基础,梳理了致密气开发过程中需要评价分析的5大品质特性,提出了表征致密气储层特征的关键参数,确定了适用研究区的致密气储层定量表征和评价技术,形成了一套指标体系:多旋回精细等时地层格架和砂体叠置结构特征分析技术以确定储层空间展布;TOC测井参数地质统计定量技术以确定有机质丰度;岩心"四性"关系标定与序贯高斯模拟的储层物性定量表征技术以确定储层物性分类级别;基于岩心应力实验和测井解释的岩石脆性指数综合判定技术以确定岩石可压性;与压裂水平井产量相关的多参数组合综合评价技术以确定有利布井区;井下微地震监测技术定量用以表征人工裂缝、优化井位部署;水平井分段压裂优化技术确定最佳压裂段数、缝间距等参数,落实分段压裂水平井单井控制体积,确定单井控制储量。通过储层和裂缝综合研究不断优化致密气藏开发井网,其中大规模水平井压裂是致密气高产的有效保障,这些技术的现场应用也取得了显著的效果。

Q uantitative characterization technique for tight gas reservoir in Groundbirch,Canada

Based on the study of large-scale tight sand gas field in Groundbirch, Canada, this paper presents five properties for evaluation and analysis in tight gas development process, proposes the key parameters of tight-gas reservoir characterization, and determines the quantitative characterization and evaluation techniques applicable for tight gas reservoir in study area. Thus, a set of index system has been formed and includes multi-cycle fine isochronous stratigraphic framework and the analysis technique of sand-body superimposition structure characteristics for outlining reservoir distribution, the geostatistical quantitative technique of TOC logging parameters for obtaining organic matter abundance, the calibration technique of core "four-property" correlation and the quantitative characterization technique of reservoir properties based on sequential Gaussian simulation method for determining reservoir property classification level, the comprehensive discrimination technique of rock brittleness index based on core stress test and logging interpretation for determining rock compressibility, the integrated evaluation technique of multiple parameter assemblages related with the production of fracturing horizontal well for identifying favorable well blocks, the subsurface micro-seismic monitoring technology applicable to quantitatively characterize artificial fractures and optimize well arrangement, the optimizing technique of horizontal multi-stage fracturing for determining optimal fracturing member quantity, fracture spacing and other parameters as well as the single-well control volume and reserve of staged fracturing horizontal wells. The comprehensive research on reservoirs and fractures achieves the constant optimization of exploratory well pattern in tight gas reservoir, and the large-scale horizontal fracturing production is an effective way to guarantee high tight-gas production. These techniques have remarkable application effects in field.