顺北4号断裂带凝析气藏相态特征及差异富集主控因素

doi:10.13809/j.cnki.cn32-1825/te.2025.01.007

油气藏评价与开发 ›› 2025, Vol. 15 ›› Issue (1): 56-63.doi: 10.13809/j.cnki.cn32-1825/te.2025.01.007

顺北4号断裂带凝析气藏相态特征及差异富集主控因素

任泓宇¹^,³(), 张子轶¹^,³, 肖重阳², 谭涛¹^,³(), 马冬晨¹^,³, 黄诗文¹^,³

1.中国石化西北油田分公司实验检测技术中心，新疆乌鲁木齐 830011
2.中国石化西北油田分公司勘探开发研院，新疆乌鲁木齐 830011
3.中国石化缝洞型油藏提高采收率重点实验室，新疆乌鲁木齐 830011

收稿日期:2024-02-04 发布日期:2025-01-26 出版日期:2025-02-26
通讯作者: 谭涛 E-mail:79910801@qq.com;17928945@qq.com
作者简介:任泓宇（1993—），男，硕士，工程师，主要从事油气田开发地质与实验技术研究工作。地址：新疆乌鲁木齐市长春南路466号，邮政编码：830011。E-mail：79910801@qq.com
基金资助:
中国石化科技部项目“顺北二区断控凝析气藏注天然气相态特征及驱替实验研究”(KLP23028)

Phase characteristics and main controlling factors of differential enrichment of condensate gas reservoirs in the Shunbei No. 4 fault zone

REN Hongyu¹^,³(), ZHANG Ziyi¹^,³, XIAO Chongyang², TAN Tao¹^,³(), MA Dongchen¹^,³, HUANG Shiwen¹^,³

1. Experimental Testing Technology Center, Sinopec Northwest Oilfield Company, Urumqi, Xinjiang 830011, China;
2. Research Institute of Exploration and Development, Sinopec Northwest Oilfield Company, Urumqi, Xinjiang 830011, China;
3. Sinopec Key Laboratory of Fracture‐cavity Reservoir Enhanced Oil Recovery, Urumqi, Xinjiang 830011, China

Received:2024-02-04 Online:2025-01-26 Published:2025-02-26
Contact: TAN Tao E-mail:79910801@qq.com;17928945@qq.com

摘要/Abstract

摘要：

顺北4号断裂带位于顺托果勒低隆起中部，该条带油气藏类型为受断裂带控制的凝析气藏，内部凝析气藏相态特征具有明显的南北分异性，国内外同类型的油气藏较少，因此，对该条带的相态特征及造成其差异性分布的主控因素进行深入研究能为同类型凝析气藏的勘探开发提供借鉴。研究利用PVT（压力—容积—温度）高压物性实验分析、有机地球化学分析、流体包裹体分析测试等技术手段，综合研究得出相关认识。研究结果表明：顺北4号断裂带原油整体为低凝固点、低含硫、中—高含蜡的轻质油；天然气甲烷摩尔分数、气油比、天然气干燥系数、CO₂摩尔分数在段内呈现差异性分布特征；通过PVT实验分析油气藏类型为凝析气藏，地露压差较大，属于未饱和油藏，北段的临界温度、临界压力明显高于中、南段，由北向南存在递减趋势；从烃源岩和成藏的角度分析，认为顺北4号断裂带凝析气藏差异富集的主控因素为多源供烃和多期成藏。

关键词: 顺北油田, 油气成藏, 凝析气藏, 油气藏相态, 烃源岩

Abstract:

The Shunbei No. 4 fault zone is located in the central part of the Shuntuoguole Low Uplift. The reservoir type in this zone is a condensate gas reservoir controlled by fracture zones. This type of reservoir is rare both domestically and internationally. The phase characteristics of the condensate gas reservoir exhibit a clear north-south differentiation. In-depth research on the phase characteristics and the main controlling factors of this differentiation can provide valuable insights for the exploration and development of similar condensate gas reservoirs. This study employed various technical methods, including PVT (pressure-volume-temperature) high-pressure physical property experiments, organic geochemical analysis, and fluid inclusion analysis and testing. The results showed that the crude oil in the Shunbei No. 4 fault zone was characterized by a low freezing point, low sulfur content, and medium-to-high wax content. Within the zone, natural gas exhibited differential distribution in terms of methane molar fraction, gas-oil ratio, gas dryness coefficient, and CO₂ molar fraction. PVT experiments indicated that the reservoir was a condensate gas reservoir with a large difference between formation pressure and dew-point pressure, classifying it as an unsaturated reservoir. The critical temperature and pressure in the northern section were significantly higher than in the middle and southern sections, showing a decreasing trend from north to south. From the perspective of hydrocarbon source rocks and reservoir formation, the differential enrichment of condensate gas reservoirs in the Shunbei No. 4 fault zone is primarily controlled by multiple sources of hydrocarbon supply and multiple phases of reservoir formation.

Key words: Shunbei oilfield, hydrocarbon accumulation, condensate gas reservoir, reservoir phase, hydrocarbon source rock

中图分类号:

TE349

任泓宇,张子轶,肖重阳等. 顺北4号断裂带凝析气藏相态特征及差异富集主控因素[J]. 油气藏评价与开发, 2025, 15(1): 56-63.

REN Hongyu,ZHANG Ziyi,XIAO Chongyang, et al. Phase characteristics and main controlling factors of differential enrichment of condensate gas reservoirs in the Shunbei No. 4 fault zone[J]. Petroleum Reservoir Evaluation and Development, 2025, 15(1): 56-63.

图/表 9

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分段	露点压力/ MPa	地露压差/ MPa	临界温度/ ℃	临界压力/ MPa	临界凝析温度/ ℃	临界凝析压力/ MPa	最大反凝析液量/ %	最大反凝析压力/ MPa
南段	41.90~50.08	29.86~43.73	-102.38~-134.13	3.49~13.72	283.03~355.89	45.34~51.18	5.31~8.05	14.00~23.96
中段	36.53~52.07	37.12~55.66	-117.37~-52.41	1.74~18.39	282.30~398.01	42.61~52.23	2.65~7.71	12.00~21.85
北段	37.17~47.65	37.62~53.38	11.22~41.31	30.40~43.80	321.32~376.00	39.57~49.86	11.61~20.91	19.61~34.53

顺北4号断裂带凝析气藏相态特征及差异富集主控因素

Phase characteristics and main controlling factors of differential enrichment of condensate gas reservoirs in the Shunbei No. 4 fault zone

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