石油与天然气地质 ›› 2019, Vol. 40 ›› Issue (2): 436-442,450.doi: 10.11743/ogg20190222

• 方法技术 • 上一篇    下一篇

塔河油田缝洞型油藏气驱动用储量计算方法

朱桂良, 孙建芳, 刘中春   

  1. 中国石化 石油勘探开发研究院, 北京 100083
  • 收稿日期:2018-07-04 修回日期:2018-11-28 出版日期:2019-04-28 发布日期:2019-01-23
  • 作者简介:朱桂良(1986-),男,硕士、工程师,油气田开发。E-mail:zhugl.syky@sinopec.com。
  • 基金资助:
    国家科技重大专项(2016ZX05014-004)。

An approach to calculate developed reserves in gas drive fractured-vuggy reservoirs in Tahe oilfield

Zhu Guiliang, Sun Jianfang, Liu Zhongchun   

  1. Petroleum Exploration and Production Research Institute, SINOPEC, Beijing 100083, China
  • Received:2018-07-04 Revised:2018-11-28 Online:2019-04-28 Published:2019-01-23

摘要: 塔河油田缝洞型油藏储集空间类型多样、尺度差异大、呈非连续性分布,不同与常规砂岩层状油藏,属典型的块状油藏。塔河油田缝洞型油藏现场注气增油效果显著,针对塔河缝洞型块状非均质油藏特点,提出了缝洞型油藏井组气驱动用储量的定义及计算方法。基于PDA生产数据分析法,通过流量重整压力和物质平衡时间曲线的拟合,建立了井组总动用储量的计算方法。针对塔河风化壳、暗河和断溶体3类岩溶背景,提出了基于形状因子修正系数的平面波及系数计算方法和基于地震能量体属性缝洞体三维分布的纵向动用程度计算方法。基于井组总动用储量、注气前的累产油量、平面波及系数、不规则井网形状因子修正系数及纵向动用程度,建立了不同岩溶背景下不同井网井组气驱动用储量的计算方法。该计算方法已应用于塔河注气现场,为气驱井组的优选和已气驱井组的气驱井组动用储量的评价及注气潜力分析奠定了基础。

关键词: PDA方法, 线状井网, 类面积井网, 平面波及系数, 纵向动用程度, 气驱动用储量, 缝洞型油藏, 塔河油田

Abstract: The reservoir space in the fractured-vuggy reservoirs of Tahe Oilfield is diverse in type and size,and spatially discontinuous,typical features for massive oil pools,and different from that of conventional laminar sandstone reservoirs.The gas injection measure for oil recovery enhancement is remarkable in Tahe oilfield.To characterize the massive reservoirs featuring numerous fractures,cavities and other features of heterogeneity in the Tahe oilfield,we proposed an categorization and calculation method of developed reserves through gas drive.Based on PDA production data analysis,the calculation method for total developed reserves of a well group is established by fitting flow reforming pressure and material balance time curves.For weathering crust,underground river,and fault karst,the calculation method of areal sweep efficiency is presented based on the form factor correction coefficient,and calculation method for the vertical drainage efficiency is also proposed based on the 3D distribution of fractured-vuggy reservoirs revealed by seismic cube energy attri-bute.In addition,based on the total developed reserves for a well group,cumulative production before gas flooding,areal sweep efficiency,form factor correction coefficient for irregular well patterns,and vertical drainage efficiency of reserves,the calculation method for gas drive developed reserves of well groups with various well patterns under different karst settings is established.This method has been applied to the Tahe oilfield for in-situ gas injection case studies,which has laid a solid foundation for the optimization of gas drive well group patterns,the calculation of developed reserves in gas drive well groups,and potential EOR analysis of gas injection.

Key words: PDA method, linear well pattern, pseudo-areal well pattern, areal sweep efficiency, vertical drainage efficiency, developed reserves by gas drive, fractured-vuggy reservoir, Tahe oilfield

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