摘要：Fracture effectiveness plays a key role in gas productivity of ultra-deep tight sandstone reservoirs, Kuqa depression, Tarim Basin. Based on cores, thin sections, well logging, well testing and production data, the study evaluated fracture effectiveness and illustrated its impacts on gas productivity. High-angle and vertical shear fractures are the most important types. Distribution of effective fractures shows great heterogeneous. Fracture effectiveness is influenced by tectonism, diagenesis and in-situ stress. Earlier fractures or fractures in close to gypsum rock are easier to be filled. Completely filled fractures can be reopened under late tectonism. Dissolution improves local fracture effectiveness. Minerals spanning fracture surfaces protect fracture effectiveness from late compression. Fractures filled with calcite can be activated by acidification. Effective fractures parallel to maximum horizontal principal compressive stress direction show larger aperture. Overpressure can decrease the effective normal stress to maintain fracture effectiveness. With exploitation, decline in pore pressure reduces fracture effectiveness. Linear density, aperture, and strike of effective fractures influence gas productivity. Effective fractures greatly enhance matrix permeability. Therefore, more abundant and larger aperture fractures are always corresponded to higher productivity. However, effective fractures also facilitate late water invasion, especially, both mutually parallel. Intense water invasion leads to rapidly declines in productivity.

关键字：tectonic fracture; fracture effectiveness; gas productivity; ultra-deep tight sandstone; Kuqa depression

ISSN号：1000-9515

卷、期、页：卷98期6页: 1557-1573

发表日期：2024-12-01

期刊分区（SCI为中科院分区）：三区

收录情况：SCI（科学引文索引印刷版）,地学领域高质量科技期刊分级目录（国内T1）,SCIE（科学引文索引网络版）

发表期刊名称：ACTA GEOLOGICA SINICA-ENGLISH EDITION

参与作者：李海明,刘建忠

通讯作者：徐小童,韩高松,徐辉,冀春秋

第一作者：曾联波,董少群,第五鹏祥

论文类型：期刊论文

论文概要：徐小童,曾联波,董少群,第五鹏祥,李海明,刘建忠,韩高松,徐辉,冀春秋，Fracture Effectiveness and its Influence on Gas Productivity in Ultra-deep Tight Sandstone Reservoirs of the Keshen Gas Field, Tarim Basin，ACTA GEOLOGICA SINICA-ENGLISH EDITION，2024，卷98期6页: 1557-1573

论文题目：Fracture Effectiveness and its Influence on Gas Productivity in Ultra-deep Tight Sandstone Reservoirs of the Keshen Gas Field, Tarim Basin