鄂尔多斯盆地侏罗系底水油藏顶部注CO2重塑流场

doi:10.7657/XJPG20250505

摘要/Abstract

摘要：

鄂尔多斯盆地侏罗系油藏边底水发育，油藏投入开发后含水率上升快，水驱开发采收率低。为探索该类油藏提高采收率新方法和濒临废弃油藏埋碳增产新途径，在姬塬X1区块Y9油藏开展了顶部注CO₂重塑油藏流场先导试验。通过注CO₂辅助重力驱油机理分析，利用多相多组分数值模拟研究了油藏地质参数的敏感性和适应性，并优化了试验区的油藏工程参数。结果表明：鄂尔多斯盆地侏罗系底水油藏水驱后剩余油主要以水驱和底水侵入后赋存在注采井间的厚油环、由底水锥进和边水内推形成的在含油外边缘至采油井的薄油环及水驱残余油3种形式存在；顶部注CO₂是抑制底水锥进的有效方法，随着人工气顶的形成及扩大，气油界面下移，油水界面相应下移，底水锥进得到缓解；影响注CO₂辅助重力驱的主要因素为地层倾角、油藏厚度、渗透率、非均质性、原油性质、含油饱和度等；模拟研究和现场试验表明顶部注CO₂辅助重力驱可以有效重塑注水开发油藏的流场，并提高最终采收率。

关键词: 鄂尔多斯盆地, 侏罗系, 底水油藏, 顶部注气, 注CO₂辅助重力驱, 重塑流场, 影响因素

Abstract:

Edge and bottom water are found in the Jurassic oil reservoirs in the Ordos Basin. In this kind of reservoirs, rapid water cut rise and low recovery by water flooding occur after initital production. In order to explore new methods for enhanced oil recovery in such reservoirs and find new ways to increase production by carbon sequestration in near-abandoned reservoirs, a pilot test was conducted on top CO₂ injection for flow field reconstruction in the Y9 reservoir in the X1 block of Jiyuan oilfield. Through the mechanism analysis of CO₂-assisted gravity drainage, multiphase and multi-component numerical simulation was performed to understand the sensitivity and adaptability of the reservoir's geological parameters, and the reservoir engineering parameters were also optimized for the test area. The results show that the residual oil in the Jurassic bottom water reservoirs after waterflooding mainly exists in three forms: thick oil ring in the zone between injection and production wells after the invasion of bottom water, thin oil ring in the zone from the outer oil-bearing edge to the oil production well due to bottom water coning and edge water intrusion, and residual oil after waterflooding. Injecting CO₂ at the reservoir top is an effective way to inhibit bottom water coning. As an artificial gas cap forms and exaggerates, gas-oil contact moves downwards, and accordingly oil-water contact becomes lower, alleviating bottom water coning. The main factors affecting CO₂-assisted gravity drainage include formation dip, reservoir thickness, permeability, heterogeneity, crude oil properties, and oil saturation, etc. Simulation studies and pilot tests indicate that CO₂-assisted gravity drainage at the reservoir top can effectively reconstruct the flow field in waterflooding reservoirs, thereby enhancing the ultimate recovery.

Key words: Ordos Basin, Jurassic, bottom water reservoir, top CO₂ injection, CO₂-assisted gravity drainage, flow field reconstruction, influencing factor

中图分类号:

TE348

邹建栋, 谭习群, 张皎生, 李超, 刘俊刚, 吕伟, 赵海峰. 鄂尔多斯盆地侏罗系底水油藏顶部注CO₂重塑流场[J]. 新疆石油地质, 2025, 46(5): 560-566.

ZOU Jiandong, TAN Xiqun, ZHANG Jiaosheng, LI Chao, LIU Jungang, LYU Wei, ZHAO Haifeng. CO₂ Injection for Flow Field Reconstruction in Jurassic Bottom Water Reservoirs， Ordos Basin[J]. Xinjiang Petroleum Geology, 2025, 46(5): 560-566.

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鄂尔多斯盆地侏罗系底水油藏顶部注CO₂重塑流场

CO₂ Injection for Flow Field Reconstruction in Jurassic Bottom Water Reservoirs， Ordos Basin

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