摘要
四川盆地安岳气田GM地区灯四段气藏属于典型的深层岩溶风化壳碳酸盐岩气藏,由于受到多期岩溶作用的影响,储层具有强非均质性特征,气藏渗流规律复杂,气井产能差异大,投资规模大。为提高气藏储量动用、降低投资、实现效益开发,必须根据开发地质目标储层类型选择合理的开发井距,通过针对不同类型储层采用试井、气藏工程、经济评价等多种方法,计算气藏合理开发井距。研究结果表明:①灯四段气藏储层类型多样,宜采用不规则井网有利于提高储量动用率;②裂缝—孔洞型储层缝洞交错发育,搭配关系好,井控范围大,合理井距为2.0 km左右;③孔洞型储层溶蚀孔洞较发育,裂缝相对欠发育,合理井距为1.0 km左右;④为尽可能避免气藏开发过程中发生井间干扰,计算灯四段气藏经济极限井距为1.0 km;n通过计算及同类气藏类比,最终确定GM地区灯四段气藏合理开发井距为1.0~2.0 km,该成果可为气藏开发井位部署提供重要的理论依据。
Z2dn4 gas reservoirs,GM area,Anyue gasfield,Sichuan Basin,are typical karst weathering crust of carbonate gas reservoirs.Due to some influence of multi-period karstification,they are featured by strong heterogeneity,their seepage law is complex,and productivity difference between gas wells is great.Their deeper burial depth leads to a large investment.In order to improve reserve-producing rate,reduce investment,and realize benefit development,it’s necessary to select reasonable development-well spacing according to reservoir type.In this study,the reasonable well spacing was calculated by means of various methods (e.g.well testing,reservoir engineering,and economic evaluation) based on different reservoir types.Results show that (1) there are various types for these reservoirs,so irregular well pattern is suitable to improve the reserve-producing rate;(2) in fractured-vuggy reservoirs,fractures and vugs are developed very well in the interlaced pattern,and well control range is large,so the reasonable well spacing should be about 2.0 km;(3) especially in vuggy reservoirs,dissolution pores are developed whereas fractures are relatively underdeveloped,so the spacing should be 1.0 km;and (4) in order to avoid multi-well interference as far as possible,the economic well-spacing limit calculated for Z2dn4 gas reservoirs should be 1.0 km;and (5) through calculation and analogy of similar reservoirs,the reasonable development-well spacing of Z2dn4 gas reservoirs should range from 1.0 km to 2.0 km.
作者
邓惠
彭先
刘义成
徐伟
陶夏妍
谈健康
高奕奕
Deng Hui;Peng Xian;Liu Yicheng;Xu Wei;Tao Xiayan;Tan Jiankang;Gao Yiyi(National Energy R&D Center of High-Sulfur Gas Exploitation,Chengdu,Sichuan 610041,China;Explorationand Development Research Institute,PetroChina Southwest Oil&Gasfield Company,Chengdu,Sichuan 610041,China)
出处
《天然气勘探与开发》
2019年第3期95-100,共6页
Natural Gas Exploration and Development
基金
国家科技重大专项“四川盆地大型碳酸盐岩气田开发示范工程”(编号:2016ZX05052)
中国石油天然气股份公司科技重大专项课题“川中地区灯四气藏规模有效开发关键技术研究与应用”(编号:2016E-0606)
关键词
碳酸盐岩
气藏
井网
井距
经济极限
Carbonate rock
Gas Reservoir
Well pattern
Well spacing
Economic limit
