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水平井技术是提高致密气单井产量、实现致密气经济有效开发的关键技术之一,与国外致密砂岩气田稳定分布的储层条件相比,国内致密砂岩气田一般具有储层规模小、纵向多层、整体分散及局部相对富集等特点,水平井开发地质目标优选是实现国内致密砂岩气田水平井规模化应用的关键技术问题。以国内典型致密砂岩气田苏里格气田为例,通过实钻水平井地质综合分析和密井网区精细地质解剖,应用储层构型层次分析方法,根据砂体及有效砂体叠置样式的不同,将苏里格气田水平井划分为3个大类6个小类水平井钻遇储层地质模型:A_1垂向切割叠置型、A_2侧向切割叠置型、B_1夹层堆积叠置型、B_2隔层堆积叠置型、C_1单层孤立型、C_2横向串联型。其中分布在辫状河体系叠置带内的A_1垂向切割叠置型和B_1夹层堆积叠置型是水平井开发的主要地质目标。依据储层地质、生产动态、储量丰度、井网密度等关键参数,建立了水平井整体开发和甜点式开发_2种开发模式下的井位优选标准,并成功应用于苏中X区块,取得了较好的应用效果,同时该地质目标优选方法与井位优选标准对我国同类气藏的开发具有很好的借鉴作用。
Horizontal well technology is one of the key technologies to increase the production of tight gas in single well and realize the economical and effective development of tight gas. Compared with the stable reservoir conditions in the tight sandstone gas field in the world, the domestic tight sandstone gas field generally has the advantages of small reservoir size and long vertical Layer, the overall dispersion and the relative enrichment of local characteristics, the development of horizontal well geological targets optimization is the realization of horizontal sandstone gas field in the domestic large-scale application of key technical issues. Taking the Sulige gas field in typical tight sand gas field as an example, through the comprehensive geological analysis of horizontal drilling wells and the fine geological dissection of the close well network, the reservoir configuration analysis method is applied. According to the superimposed patterns of sand bodies and effective sand bodies Differently, the horizontal wells of Sulige gas field are divided into three major categories and six sub-types of horizontal wells to meet the reservoir geological model: A_1 vertical cutting overlap type, A_2 lateral cutting overlap type, B_1 sandwich stacking type, B_2 Stacked stacked type, C_1 single-layer isolated type, C_2 horizontal tandem type. Among them, the A_1 vertical cutting superimposed pattern and the B_1 mezzanine superimposed pattern distributed in the braided river system superimposed zone are the main geologic targets for horizontal well development. Based on the key parameters such as reservoir geology, production dynamics, reserve abundance and well density, wellbore development and dessert-type development for horizontal wells were established. The well selection criteria under two development modes were successfully applied to Suzhong X block , And achieved good application results. At the same time, the method of selecting geological targets and well selection criteria have a good reference for the development of similar gas reservoirs in China.