I 摘要 近年来，普光气田陆相油气勘探取得了重大突破，须家河组探明储量丰富，成为普 光气田重要的接替储量。然而，由于普光陆相气藏属于致密、超低渗透储层，产能低， 开发难度大，垂直井开发几乎没有经济效益。目前已尝试性地完成了 1 口大位移斜井和 1 口水平井，均采用多段压裂投产方式，初期获得了较高的产量，但产量下降快，稳产 期极短。水平井开发是否适用于普光陆相气藏，经济效益如何，成为困扰普光陆相气藏 开发的关键因素。 本报告在普光陆相气藏地质研究的基础上，以现有 3 口井的试油试采数据为依据， 综合运用现代试井分析和生产动态分析手段，认识和评价气藏的动态特征。采用气藏数 值模拟和数学建模手段，以压裂水平井产能为目标，优化水平井及裂缝参数，通过经济 效益分析，评价水平井开发普光陆相气藏的可行性。 ① 通过普光陆相地层的岩石学特征和地应力等分析，论证了普光陆相气藏水平井 开发工程可行性。研究表明普光陆相气藏须家河组层位具备钻探水平井的地质条件。 ② 基于普陆2井的试井分析及生产动态分析，确定了普光陆相储层动态特性参数， 为水平井产能研究及参数优化奠定基础； ③ 研究了影响压裂水平井产能的主要因素，确定了水平井长度、裂缝条数、裂缝间 距以及裂缝导流能力等参数与水平井产能之间的关系。建立了适用于普光陆相气藏水平 井压裂参数的优化模型，为普光陆相气藏水平井压裂设计提供指导。 ④ 采用模型解析法和数值模拟法预测优化后的压裂水平井开发指标。20 年末的采 出程度约 61%，经济收益率高。研究表明水平井开发普光陆相气藏可行，经济效益良好。 关键字：普光陆相气藏、水平井，产能影响因素，裂缝参数优化重庆科技学院硕士报告 ABSTRACT II ABSTRACT In recent years, a great breakthrough has been made in the exploration of continental gas reservoir in Puguang. The reserves of Xujiahe formation are abundant, so that it will become an important part of replacement reserve in Puguang. However the continental gas reservoir in Puguang belongs to tight gas reservoir which has the characteristics of low permeability and low productivity, so that it is very difficult to develop this gas reservoir. It has no economic benefit to be developed with vertical Wells. It also has attempted to complete a inclined shaft with large displacement and a horizontal well in this area. Both of them put into production after fracturing. It obtain higher yield in the early, but the stable production period is short with the production declines rapidly. So that whether the the horizontal well can develop the continental gas reservoir in Puguang with great benefits will be a key factors. In this paper we understood and evaluated of dynamic characteristics of gas reservoir by studying on reservoir geological of continental gas reservoir in Puguang and the means of modern well test analysis and production dynamic analysis based on the date of trial-produce and test. We aimed at the horizontal well’s productivity by optimization of horizontal well and fracture parameters with the means of model establishment and numerical simulation. Finally, to determine the feasibility of development in Puguang continental gas reservoir with horizontal well. ① To demonstrates development engineering feasibility of Puguang continental gas reservoir with horizontal well by studying on in-situ stress and stratigraphic characteristics. The study show that the reservoir of Xujiahe possess favorable geological conditions of horizontal well drilling. ② Weconfirmed thePuguang continental gas reservoirdynamicparameters,based onthe well test and performance analysis of a highly deviated well in Puguang continental gas reservoir named Pulu 2. The result provides a basis for horizontal wells production forecast and parameters optimization. ③ As the result that, the productivity of a horizontal well has relationships among the length of horizontal, fissure length, fracture number and the conductivity of hydraulic fracture by studying on the main factors influencing the fracturing horizontal well productivity.an optimal design model of the fracture parameters which is appropriate for Puguang continental gas reservoir has been set up. It will provide guidance for Puguang continental gas reservoir on horizontal well fracturing design.重庆科技学院硕士报告 ABSTRACT III ④ Predicted the development indices of a optimization horizontal well.it shows that the recovery will be 61% after 20 years with high-yield. Research shows that developing Puguang continental gas reservoir by horizontal well is feasible with good economic benefit . Keywords： Puguang continental gas reservoir, Horizontal well, Productivity-influencing factors, Optimization of fracturing parameters重庆科技学院硕士报告 目 录 IV 目 录 摘要 ....................................................................................................................................I ABSTRACT ......................................................................................................................... II 1 绪 论................................................................................................................................ 1 1.1 研究目的及意义 ............................................................................................................. 1 1.2 国内外研究现状 ............................................................................................................. 1 1.2.1 水平井应用国内外研究现状 .................................................................................. 1 1.2.2 水平井产能及参数优化国内外研究现状................................................................. 2 1.3 报告主要研究内容.......................................................................................................... 4 1.4 报告研究的技术路线 ...................................................................................................... 4 1.5 创新点 ........................................................................................................................... 5 2 普光陆相气藏地质研究.................................................................................................. 6 2.1 沉积相及储层展布状况................................................................................................... 6 2.2 储层岩石学特征 ............................................................................................................. 7 2.3 储层物性特征................................................................................................................. 8 2.3.1 储集空间及微观孔隙结构..................................................................................... 9 2.3.2 裂缝特征 ............................................................................................................ 13 2.4 储层流体...................................................................................................................... 13 2.4.1 气体组分 ............................................................................................................ 13 2.4.2 气水相对渗透率................................................................................................. 14 2.5 储层敏感性 .................................................................................................................. 15 2.6 试采状况及动态评价 .................................................................................................... 17 2.6.1 试采状况 ........................................................................................................... 17 2.6.2 试井解释 ............................................................................................................ 18 2.6.3 生产动态分析 ..................................................................................................... 21 2.7 储量计算...................................................................................................................... 23 2.8 本章小结...................................................................................................................... 25 3 水平井开发方式论证 .................................................................................................... 26 3.1 水平井工程可行性研究...................................................................