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深层强非均质碳酸盐岩气藏合理开发井距确定 ——以安岳气田GM 地区灯四段气藏为例
Reasonable development-well spacing in deep carbonate gas reservoirs with strong heterogeneity: an example from Z2dn4 gas reservoirs, GM area, Anyue gasfield
邓 惠1,2 彭 先1,2 刘义成1,2 徐 伟1,2 陶夏妍1,2 谈健康1,2 高奕奕1,2
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DOI:10.12055/gaskk.issn.1673-3177.2019.03.012
作者单位:1. 国家能源高含硫气藏开采研发中心 2. 中国石油西南油气田分公司勘探开发研究院
中文关键字:碳酸盐岩 气藏 井网 井距 经济极限
英文关键字:Carbonate rock; Gas Reservoir; Well pattern; Well spacing; Economic limit
中文摘要: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。结果表明: 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; 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; 孔洞型储层溶蚀孔洞较发育,裂缝相对欠发育,合理井距为1.0km 左右; 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 ; 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。
英文摘要: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 
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国内统一连续出版物号:CN51-1159/TE |国内发行代码: |国际标准出版物号:ISSN1673-3177 |国际发行代码:
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