超深层裂缝性致密砂岩气藏断-缝发育特征及生产对策

doi:10.7657/XJPG20250211

摘要/Abstract

摘要： 塔里木盆地库车坳陷北部克深气田为超深层裂缝性致密砂岩气藏，近年来水侵加剧，严重影响了气田开发。以克深X气藏白垩系巴什基奇克组为研究对象，基于钻井液漏失量和成像测井，分析了气藏断-缝发育特征，总结了其对生产动态的控制作用。针对不同类型气井的生产动态特征和气藏水侵规律，建立了断-缝控制下的储集层生产动态模式，并提出了相应的生产对策。结果表明：克深X气藏微断裂整体发育程度较高，储集层断-缝划分为多缝型、单缝型和微缝型3种模式，2口多缝型储集层气井位于气藏中—高部，3口单缝型储集层气井分布在气藏中—边部，1口微缝型储集层气井位于气藏高部位；根据生产特征可将气井分为高水淹型、长期带水生产型和未见水长期稳产型3类，分别对应单缝型、多缝型和微缝型储集层，多缝型储集层气井建议保持适度产能，单缝型储集层气井建议在水侵初期注气增能，微缝型储集层气井建议维持合适的生产压差。

关键词: 塔里木盆地, 库车坳陷, 克深气田, 超深层裂缝性气藏, 致密砂岩, 巴什基奇克组, 断-缝发育特征, 生产对策

Abstract:

The Keshen gas field in the northern Kuqa depression of the Tarim Basin is a typical representative of ultra-deep fractured tight sandstone gas reservoirs. The intensifying water invasion has significantly affected the steady gas field development in recent years. Taking the Cretaceous Bashijiqike formation in the Keshen X gas reservoir as an example, the fault/fracture characteristics of the reservoir were analyzed using the drilling fluid loss and imaging logging data, and their controls over production performance were identified. Depending on production behaviors of various gas wells and water invasion patterns in the reservoir, a production performance model of the reservoir under fault/fracture control was established, and corresponding production strategies were proposed. The results show that microfractures are well developed in the Keshen X gas reservoir, and the reservoirs can be divided into three types by fault/fracture presence: multi-fracture, single-fracture and micro-fracture. Two wells targeting multi-fracture reservoirs are deployed in the middle-upper part of the Keshen X gas reservoir, four wells targeting single-fracture reservoirs in the middle and edge parts of the gas reservoir, and one well targeting micro-fracture reservoirs in the upper part of the gas reservoir. Based on production behaviors, gas wells can be classified into highly water-flooded wells, long-term water production wells, and long-term stable production wells without water breakthrough, corresponding to single-fracture reservoir, multi-fracture reservoir, and micro-fracture reservoir, respectively. It is recommended to maintain a moderate productivity for wells targeting multi-fracture reservoir, inject gas to replenish energy in the initial stage of water invasion for wells targeting single-fracture reservoir, and keep a proper production pressure differential for wells targeting micro-fracture reservoir.

Key words: Tarim Basin, Kuqa depression, Keshen gas field, ultra-deep fractured gas reservoir, tight sandstone, Bashijiqike formation, fault/fracture characteristic, production strategy

中图分类号:

TE321

王艳丽, 朱松柏, 吴伟民, 聂延波, 林娜, 赵冀, 黄锐. 超深层裂缝性致密砂岩气藏断-缝发育特征及生产对策[J]. 新疆石油地质, 2025, 46(2): 217-223.

WANG Yanli, ZHU Songbai, WU Weimin, NIE Yanbo, LIN Na, ZHAO Ji, HUANG Rui. Fault/Fracture Characteristics and Production Strategies for Ultra-Deep Fractured Tight Sandstone Gas Reservoirs[J]. Xinjiang Petroleum Geology, 2025, 46(2): 217-223.

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