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

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外文标题：Fracture Effectiveness and its Influence on Gas Productivity in Ultra-deep Tight Sandstone Reservoirs of the Keshen Gas Field,Tarim Basin

外文摘要：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.

外文关键词：

tectonic fracturefracture effectivenessgas productivityultra-deep tight sandstoneKuqa depression

作者：

XU Xiaotong、ZENG Lianbo、DONG Shaoqun、DIWU Pengxiang、LI Haiming、LIU Jianzhong、HAN Gaosong、XU Hui、JI Chunqiu

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作者单位：

State Key Laboratory of Petroleum Resources and Engineering,China University of Petroleum(Beijing),Beijing 102249,China

College of Geoscience,China University of Petroleum(Beijing),Beijing 102249,China

College of Science,China University of Petroleum(Beijing),Beijing 102249,China

Tarim Oilfield Company,PetroChina,Korla,Xinjiang 841000,China

SINOPEC Northwest Oil Field Company,Urumqi 830011,China

Shenzhen Branch of CNOOC Ltd.,Shenzhen 518000,China

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关键词：

tectonic fracture fracture effectiveness gas productivity ultra-deep tight sandstone Kuqa depression

出版年：

2024

DOI：

10.1111/1755-6724.15259

地质学报(英文版)

中国地质学会

地质学报(英文版)

CSTPCD

影响因子：1.414

ISSN：1000-9515

年,卷(期)：2024.98(6)