微小断裂特征及其对超深层气藏水侵的控制作用——以塔里木盆地克深X区块为例

doi:10.7657/XJPG20260307

摘要/Abstract

摘要：

库车坳陷克拉苏构造带是塔里木盆地超深层油气勘探开发的重要目标，克深X区块是克拉苏构造带东部发现的超深层高产气藏，随着气藏开发的深入，工作重点由明确构造圈闭外部形态向解析圈闭内部复杂构造转变。微小断裂是克深X区块水侵主要通道，其分布特征及构造形态对气藏产量具有重要影响。因此，优选方差、相干及曲率属性，通过多属性融合技术，对克深X区块微小断裂展布进行精细刻画。研究发现，克深X区块处于挤压-走滑构造转换带，东西部微小断裂性质及分布存在明显差异，西部为近东西向、大断距、挤压型微小断裂，断裂走向与水侵方向平行；东部为近北西—南东向、小断距、走滑型微小断裂，断裂走向与水侵方向高角度斜交，由于断裂带断层核对斜向水体侵入的阻挡作用，造成了克深X区块水侵程度东弱西强的现象。基于相关认识实施排水优化，在克深X区块西部的主断裂附近增设2口排水井，使气藏日排水量提高近246%，取得了较好的排水控气效果。

关键词: 塔里木盆地, 克拉苏构造带, 克深X区块, 微小断裂, 超深层气藏, 水侵, 多属性融合

Abstract:

The Kelasu structural belt in the Kuqa depression is an important target for ultra-deep petroleum exploration and development in the Tarim Basin. The Keshen X block is an ultra-deep, high-yield gas reservoir discovered in the eastern Kelasu structural belt. With the deepening of gas reservoir development, the focus of work has shifted from clarifying the external morphology of structural traps to analyzing the complex internal trap structures. Micro-faults have been identified as the primary pathways for water invasion in the Keshen X block, and their distribution patterns and structural geometries exert significant control on reservoir productivity. This study preferentially employs the variance, coherence and curvature attributes and applies multi-attribute fusion technology to precisely characterize the distribution of micro-faults in the Keshen X block. The findings reveal that the Keshen X block, situated within a compression-strike-slip structural transition zone, exhibits distinct differences in the properties and distribution of micro-faults between its eastern and western segments. In the western segment, micro-faults predominantly trend in nearly E-W direction, have large displacement, and are formed by compression, with their strikes parallel to the direction of water invasion. In the eastern segment, micro-faults are nearly NW-SE-trending, with small displacement, and originated from strike-slip, with their strikes obliquely to the direction of water invasion at a high angle. Due to the blocking effect of fault cores in the fault zone against oblique water invasion, the Keshen X block demonstrates a pronounced contrast in water invasion intensity, i.e., weak in the east and strong in the west. Guided by these findings, a water drainage strategy has been implemented by adding two drainage wells near the main faults in the western segment. This intervention increases the reservoir’s daily water drainage volume by nearly 246%, achieving excellent results in water control and gas production optimization.

Key words: Tarim Basin, Kelasu structural belt, Keshen X block, micro-fault, ultra-deep gas reservoir, water invasion, multi-attribute fusion

中图分类号:

TE122

金江宁, 马骁, 屈元基, 能源, 赵子涵, 何韫多, 王喜安. 微小断裂特征及其对超深层气藏水侵的控制作用——以塔里木盆地克深X区块为例[J]. 新疆石油地质, 2026, 47(3): 307-313.

JIN Jiangning, MA Xiao, QU Yuanji, NENG Yuan, ZHAO Zihan, HE Yunduo, WANG Xi’an. Micro-Fault Characteristics and Their Controls on Water Invasion in Ultra-Deep Gas Reservoirs: A Case Study of the Keshen X Block, Tarim Basin[J]. Xinjiang Petroleum Geology, 2026, 47(3): 307-313.

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