TY  - JOUR
AU  - Li, Yanan
AU  - Shan, Changan
AU  - Mi, Xinwu
PY  - 2026
DA  - 2026/02/02
TI  - Identification and Distribution Characteristics of Mudstone Intercalations in Ultra-Deep Tight Fractured Sandstone Gas Reservoirs: A Case Study of the Keshen A Gas Reservoir, Tarim Basin
JO  - Journal of Geo-Energy and Environment
T2  - Journal of Geo-Energy and Environment
JF  - Journal of Geo-Energy and Environment
VL  - 2
IS  - 1
SP  - 34
EP  - 45
DO  - 10.62762/JGEE.2025.797111
UR  - https://www.icck.org/article/abs/JGEE.2025.797111
KW  - keshen block
KW  - cretaceous
KW  - tight sandstone
KW  - mud interlayer
KW  - multi-scale recognition
KW  - water intrusion prevention and control
AB  - The ultra-deep tight sandstone gas reservoirs in the Tarim Basin, exemplified by the Keshen A gas reservoir, face escalating challenges of water invasion and pressure maintenance after years of production. Interlayers within these reservoirs serve as critical geological barriers, yet their spatial distribution remains poorly resolved due to limitations in conventional identification methods. This study integrates core, logging, 3D seismic, and production data within a sequence stratigraphic and reservoir geology framework to establish a ``core-logging-seismic'' collaborative identification system for argillaceous interlayers. Two main interlayer types—argillaceous and physical—are identified within the Bashijiqike Formation. Argillaceous interlayers exhibit distinctive logging responses (``high GR, high AC, low resistivity''), and seismic half-width attributes effectively delineate their lateral distribution. These interlayers are predominantly concentrated in the K1bs2 interval, with thicknesses of 0.8–2.5 m and a NW-SE oriented planar distribution. Based on thickness and lateral extent, they are classified into three levels (single-well, well-group, and reservoir-scale). Interlayers exceeding 1.5 m in thickness with good lateral continuity form effective flow barriers that significantly suppress water invasion. The findings were applied to well-pattern optimization in 2023, reducing overall water influx by 37% and increasing estimated recovery by 8.2%, supporting a transition from empirical to geologically-guided development in ultra-deep tight reservoirs.
SN  - 3069-3268
PB  - Institute of Central Computation and Knowledge
LA  - English
ER  - 

@article{Li2026Identifica,
  author = {Yanan Li and Changan Shan and Xinwu Mi},
  title = {Identification and Distribution Characteristics of Mudstone Intercalations in Ultra-Deep Tight Fractured Sandstone Gas Reservoirs: A Case Study of the Keshen A Gas Reservoir, Tarim Basin},
  journal = {Journal of Geo-Energy and Environment},
  year = {2026},
  volume = {2},
  number = {1},
  pages = {34-45},
  doi = {10.62762/JGEE.2025.797111},
  url = {https://www.icck.org/article/abs/JGEE.2025.797111},
  abstract = {The ultra-deep tight sandstone gas reservoirs in the Tarim Basin, exemplified by the Keshen A gas reservoir, face escalating challenges of water invasion and pressure maintenance after years of production. Interlayers within these reservoirs serve as critical geological barriers, yet their spatial distribution remains poorly resolved due to limitations in conventional identification methods. This study integrates core, logging, 3D seismic, and production data within a sequence stratigraphic and reservoir geology framework to establish a ``core-logging-seismic'' collaborative identification system for argillaceous interlayers. Two main interlayer types—argillaceous and physical—are identified within the Bashijiqike Formation. Argillaceous interlayers exhibit distinctive logging responses (``high GR, high AC, low resistivity''), and seismic half-width attributes effectively delineate their lateral distribution. These interlayers are predominantly concentrated in the K1bs2 interval, with thicknesses of 0.8–2.5 m and a NW-SE oriented planar distribution. Based on thickness and lateral extent, they are classified into three levels (single-well, well-group, and reservoir-scale). Interlayers exceeding 1.5 m in thickness with good lateral continuity form effective flow barriers that significantly suppress water invasion. The findings were applied to well-pattern optimization in 2023, reducing overall water influx by 37\% and increasing estimated recovery by 8.2\%, supporting a transition from empirical to geologically-guided development in ultra-deep tight reservoirs.},
  keywords = {keshen block, cretaceous, tight sandstone, mud interlayer, multi-scale recognition, water intrusion prevention and control},
  issn = {3069-3268},
  publisher = {Institute of Central Computation and Knowledge}
}