库车坳陷克拉苏超深气田水侵特征及稳产对策

doi:10.7657/XJPG20250109

摘要/Abstract

摘要：

克拉苏超深气田水侵严重，产量递减快。通过地面地震、成像测井等资料分析，总结了断层和裂缝分布规律，结合气田生产动态特征，提出克拉苏超深气田主要有3种水侵类型：断层沟通边底水，沿裂缝非均匀水侵和局部排替不完全形成的封存水水侵，前两者为气田主要水侵形式。其水侵特征和影响范围存在明显差异：沿二级断层走向和垂向沟通边底水的能力较强，但垂直于断层方向的水侵影响较小，为局部性影响；裂缝具方向性和分布规则的特性，呈“整体分区、局部分带”的分布规律，气藏内部连通性、气藏见水顺序和水侵速度是裂缝分区分带的外在表现，对气藏水侵有全局性影响。针对气田水侵特征及开发现状，提出依据裂缝空间分布规律优化井网、加强化学堵水和注气解水锁2种配套采气技术攻关的策略。

关键词: 塔里木盆地, 库车坳陷, 克拉苏, 超深气田, 裂缝, 水侵特征, 稳产对策

Abstract:

The Kelasu ultra-deep gas field in the Kuqa depression of the Tarim Basin is challenged by severe water invasion, leading to rapid decline in production. Through analysis on surface seismic data and imaging logging data, the distribution patterns of faults and fractures were determined. Combining with the production performance of the gas field, three types of water invasion were identified in the Kelasu ultra-deep gas field: fault-communicated edge or bottom water, non-uniform water invasion along fractures, and occluded water invasion due to locally incomplete displacement. The former two types are dominant in the gas field. The three types differ significantly in characteristics and influence range. On one hand, the ability to communicate with edge or bottom water along the trend of second-order faults and vertically is strong, but water invasion perpendicular to the trend of faults has a minor, localized impact. On the other hand, fractures are oriented and distributed regularly, showing a feature of “zones generally and belts locally”. The differences in the internal connectivity of the gas reservoir, the order and the speed of water invasion in the gas reservoir are the external manifestations of the division and zonation of fractures, which have a global effect on water invasion in the gas reservoir. Considering the water invasion characteristics and development status of the gas field, strategies were proposed to optimize well pattern according to spatial distribution of fractures, and to strengthen researches on two supporting gas production technologies: chemical water plugging and gas injection to alleviate water lock.

Key words: Tarim Basin, Kuqa depression, Kelasu, ultra-deep gas field, fracture, water invasion characteristic, stable production strategy

中图分类号:

TE37

刘立炜, 周慧, 闫炳旭, 焦玉卫, 屈元基, 金江宁, 潘杨勇. 库车坳陷克拉苏超深气田水侵特征及稳产对策[J]. 新疆石油地质, 2025, 46(1): 71-77.

LIU Liwei, ZHOU Hui, YAN Bingxu, JIAO Yuwei, QU Yuanji, JIN Jiangning, PAN Yangyong. Water Invasion Characteristics and Stable Production Strategies in Kelasu Ultra-Deep Gas Field, Kuqa Depression[J]. Xinjiang Petroleum Geology, 2025, 46(1): 71-77.

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水侵类型	渗流介质分布规律	气井生产动态特征	对气藏开发影响	典型井
断层沟通边底水	南翼断层较发育，北翼断层相对不发育，核部介于两者之间，二级断层主要分布于南翼	测试气水同出，氯离子含量较高，投产后氯离子含量保持稳定	沿垂向、走向沟通边底水，对垂直于走向方向影响小，局部气水同出，局部影响气藏水侵	KeS904井、 DB2井
沿裂缝非均匀水侵	裂缝整体分区、局部分带，方向性明显，分布规则	投产早期不出水，出水后油压下降，产气量减少，产水量升高，氯离子含量上升	裂缝指向强能量水体，非均匀水侵严重，例如，克深段气藏；裂缝指向南、北翼弱能量水体，非均匀水侵影响小，裂缝主要表现为提高单井产能，例如，博孜—大北段气藏；裂缝对气田水侵的影响具有分区性，对气藏水侵具全局性影响	KeS2-1-6井
局部排替不完全形成封存水	气田南部因构造形成时间晚，裂缝发育程度较低，局部地层水排替不完全	测试气水同出，氯离子含量介于地层水和凝析水之间，投产后氯离子含量有下降趋势	局部气水同出，局部影响气藏水侵	KeS13井