I 新场须二气藏排水采气可行性研究 摘要 新场气田构造位置位于四川盆地川西坳陷，具有生储盖条件优越、圈闭发育、储量 大等特点，被认为具备成为大中型气田的潜力，经过十多年的开发以及期间的地质构造 变化，须二气藏水侵严重。川西地区须家河组气水分布复杂且控制因素不清，严重制约 了天然气的勘探开发进程，降低了天然气开采效益。本文在前人研究成果的基础上，针 对须二气藏勘探开发及地质研究现状，对现有地质录井、试井、测井和开发动态资料进 行分析，研究分析产层段测井特征，分析产水气井水化学特征和生产动态，划分开发单 元，确定气藏开发过程中水侵路线及气水分布特征，调研排水采气技术界限，对排水采 气技术在须二气藏的可行性进行研究，提出针对有水气藏有效的开发建议。研究过程中 取得了以下几点认识： (1)新场气田须家河组储层地质模型为天然裂缝沟通低孔砂岩和可能的高孔砂岩构 成的裂缝—孔隙性储集体。须二气藏各开发井可以划分为 3 个裂缝单元，即新 856 井主 力裂缝单元、联 150 和新 10 井裂缝单元。 (2)在排除凝析水淡化影响后，地层水化学特征变化不大，均为高矿化度的CaCl 2 型， 须二段总矿化度范围为 100383.7～115714.1mg/L。 (3)开发井气水产量变化可以分为受地层水影响较小的气井、具有一般水侵特征的气 井和具有特殊气水产出特征的气井。原始状态下，裂缝单元中基本属于高部位富集天然 气、低部位为地层水占据，裂缝系统中均气水共存。 (4)新 856 井裂缝系统物质平衡法计算天然气地质储量 88.7×10 8 m 3 。储层地质说明不 存在连片大水体，开发动态分析证明气水分布为多个分隔的气体和水体的复杂关系，水 体产出属于隔气式气驱水，为被动水驱。排出水体是减少水淹、开发分隔气的必由之路。 (5)新 856 井系统通过低部位的川孝 560 和川孝 565 井须二水层开展强排水，可望解 除新 3、新 856 和新 853 等井的水淹，增加产气能力。 关键字：排水采气 气水分布 水侵过程 开发动态 须二气藏成都理工大学硕士学位报告 II The Study on Feasibility of Drainage Gas Recovery in Member 2 of Xujiahe Formation in Xinchang Gas Field Abstract The structural position of XinChang gas field in western depression of Sichuan basin has the characteristics of completed traps, trap development and large reserves.It is judged to be a large and medium size gas field. The situation of water invasion of Member 2 of Xujiahe formation in Xinchang gas field is serious after ten years development and the change of geological structure.Though the studies of many scholars and research units for Xujiahe formation in Xinchang gas field had obtained many results, development requirements of Xujiahe gas field can’t be satisfied with the results. The gas-water distribution of Xujiahe formation is complex and its controlling factors are not clear.Those problems don’t only affect the progress of the gas exploration and development serisously,but also decrease the gas mining benefits.This paper,which is based on the study results of predecessor, analysed the feature of the available well testing, well logging and development performance data.Researched and analysised the logging feature of pay formation,analysised the feature of water chemistry and production performance,divided development unit,researched the technologic boundaries and feasibility of drainage gas in member 2 of Xujiahe formation gas field and proposed development suggest for the gas reservoirs with water are also be done.During the studing I got the main understandings as follows： (1) The reservoir geological model of member 2 of Xujiahe formation in Xinchang gas field is fractured-porous reservoir which is communicated between low-porosity sandstone and probable high-porosity sandstone by natural fracture.The development wells in member 2 of Xujiahe formation gas field can be divided into three fracture units, which includes the fracture unit around X856, the fracture unit around L150 and the fracture unit around X10. (2) The types of formation water are all CaCl 2 , eliminated the impact of desalination condensate. There is little change in formation water chemical characteristics. The total mineralization of member 2 of Xujiahe formation is between 100383.7mg/L and 115714.1mg/L. (3) The water output changement of development gas wells can be divided into less affected by formation water gas wells, general water invasion wells and special gas&water output wells. On the initial conditions, The network of fracture is filled with gas&water,whereAbstract III gas is in high structure position while water in the low position. (4) The gas geological reserves of X856 fracture system is worked out to be 88.7×10 8 m 3 by material balance method. Reservoir geological illustrates that the contiguous large body of water does not exist. Development of dynamic analysis shows the distribution of gas and water are separated into multiple gas and water bodies.Water output belongs to trap-type gas drive which is passive water drive. It is the only way to reduce waterflooding and develop trap-type gas by discharging water. (5) The fracture system around X856 can release the waterflooding of the well X3,X856 and X853,and can increase gas production capacity through drainaging water strongly in CX560 and CX565 which are in low structure position. Keywords: Drainage gas recovery Gas-water distribution Water invasion process Development performance The gas reservoir of member 2 of Xujiahe formation目 录 I 目 录 摘要.........................................................................................................................................I Abstract ......................................................................................................................................II 第 1 章 引 言.......................................................................................................................... 1 1.1 选题依据及研究意义.................................................................................................. 1 1.2 国内外研究现状.......................................................................................................... 1 1.3 主要研究内容及思路.................................................................................................. 3 1.3.1 主要研究内容................................................................................................... 3 1.3.2 研究思路及技术路线....................................................................................... 3 1.4 取得的主要认识.......................................................................................................... 4 第 2 章 研究区地质概况.......................................................................................................... 5 2.1 工区地理位置.............................................................................................................. 5 2.2 勘探开发现状.............................................................................................................. 5 2.2.1 钻探简况........................................................................................................... 6 2.2.2 试采及生产简况............................................................................................... 7 2.3 气藏构造与岩性特征.................................................................................................. 7 2.3.1 气藏构造特征................................................................................................... 7 2.3.2 储层特征........................................................................................................... 8 2.3.3 须二段小层细分与对比................................................................................... 9 第 3 章 产层段测井及气藏动态特征研究.............................................................................11 3.1 产层段测井特征研究.................................................................................................11 3.1.1 典型气层特征..................................................................................................11 3.1.2 典型水层特征................................................................................................. 14 3.1.3 较高电阻率的测试水层................................................................................. 15 3.2 水化学特征研究......................