Fault/Fracture Characteristics and Production Strategies for Ultra-Deep Fractured Tight Sandstone Gas Reservoirs

doi:10.7657/XJPG20250211

Abstract

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

CLC Number:

TE321

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.

Figures/Tables 9

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