Influence of sedimentary microfacies on the rock mechanics of ultra-deep reservoirs and its application: a case study of the Cretaceous formation in the BZ gas field of Kuqa Depression, Tarim Basin

WANG Zhimin; SUN Haitao; ZHANG Hui; WANG Chenguang; YIN Guoqing; XU Ke; ZHONG Dakang

doi:10.11781/sysydz202404664

Volume 46 Issue 4

Jul. 2024

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WANG Zhimin, SUN Haitao, ZHANG Hui, WANG Chenguang, YIN Guoqing, XU Ke, ZHONG Dakang. Influence of sedimentary microfacies on the rock mechanics of ultra-deep reservoirs and its application: a case study of the Cretaceous formation in the BZ gas field of Kuqa Depression, Tarim Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(4): 664-673. doi: 10.11781/sysydz202404664

Citation:

WANG Zhimin, SUN Haitao, ZHANG Hui, WANG Chenguang, YIN Guoqing, XU Ke, ZHONG Dakang. Influence of sedimentary microfacies on the rock mechanics of ultra-deep reservoirs and its application: a case study of the Cretaceous formation in the BZ gas field of Kuqa Depression, Tarim Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(4): 664-673. doi: 10.11781/sysydz202404664

Citation:

WANG Zhimin, SUN Haitao, ZHANG Hui, WANG Chenguang, YIN Guoqing, XU Ke, ZHONG Dakang. Influence of sedimentary microfacies on the rock mechanics of ultra-deep reservoirs and its application: a case study of the Cretaceous formation in the BZ gas field of Kuqa Depression, Tarim Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(4): 664-673. doi: 10.11781/sysydz202404664

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Influence of sedimentary microfacies on the rock mechanics of ultra-deep reservoirs and its application: a case study of the Cretaceous formation in the BZ gas field of Kuqa Depression, Tarim Basin

doi: 10.11781/sysydz202404664

WANG Zhimin^{1, 2, 3, 4
,},
SUN Haitao^{5, 6
,
,},
ZHANG Hui^{1, 2, 3, 4},
WANG Chenguang^{5, 6},
YIN Guoqing^{1, 2, 3, 4},
XU Ke^{1, 2, 3, 4},
ZHONG Dakang^{5, 6}

1.
Research Institute of Petroleum Exploration and Development, Tarim Oilfield Branch Company, CNPC, Kurla, Xinjiang 841000, China
2.
R & D Center for Ultra-deep Complex Reservoir Exploration and Development, CNPC, Kurla, Xinjiang 841000, China
3.
Engineering Research Center for Ultra-deep Complex Reservoir Exploration and Development, Kurla, Xinjiang 841000, China
4.
Xinjiang Key Laboratory of Ultra-deep Oil and Gas, Kurla, Xinjiang 841000, China
5.
College of Geosciences, China University of Petroleum (Beijing), Beijing 102249, China
6.
State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing 102249, China

Received Date: 2023-12-01
Rev Recd Date: 2024-05-30
Publish Date: 2024-07-28

Abstract

Abstract

To optimize the identification of sweet spots with natural fracture development in ultra-deep tight sandstone reservoirs of Cretaceous in the Kuqa Depression, Tarim Basin, this study systematically analyzed the differences in rock mechanical properties across various sedimentary microfacies in the BZ gas field. Utilizing data from outcrops, rock slices, imaging logging, and other sources, a method for optimizing the rock mechanics parameter model of reservoirs was proposed, which enhanced the prediction accuracy of natural fractures within 200 m around the wellbore. Key findings of the research include: (1) In the third member of the Cretaceous Bashijiqike Formation in the BZ gas field, different sedimentary microfacies and the same microfacies at different positions had differences in rock composition and rock assemblages (including debris content, matrix content, grain size sorting, sand-to-mud ratio, and sand-mudstone combinations). These variations affected the reservoir's Poisson's ratio and Young's modulus, and different microfacies had different rock mechanical parameters. (2) The extent of fracture development differed across various sedimentary microfacies of sand bodies. Fractures were most developed in the underwater distributary channel sandstones at the fan delta front, making them more prone to fracturing compared to the interdistributary bay microfacies and distributary channel microfacies on the delta plain. (3) By further establishing three-dimensional models of different microfacies based on geometric parameters derived from outcrops, it would be feasible to optimize sedimentary microfacies models and rock mechanical parameter models around the wellbore, thereby facilitating more accurate fracture prediction.
- fracture prediction,
- reservoir geomechanics,
- sedimentary microfacies,
- tight sandstone,
- ultra-deep reservoir,
- Tarim Basin

All authors disclose no relevant conflict of interests.
WANG Zhimin was responsible for writing and revising the paper. SUN Haitao was responsible for identifying and analyzing sedimentary facies. WANG Chenguang was responsible for establishing geological and fracture models. XU Ke was responsible for geomechanical data analysis. YIN Guoqing was responsible for image drawing. ZHANG Hui and ZHONG Dakang were responsible for proofreading the manuscript. All authors have read the last version of the paper and consented to its submission.

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References(29)

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Influence of sedimentary microfacies on the rock mechanics of ultra-deep reservoirs and its application: a case study of the Cretaceous formation in the BZ gas field of Kuqa Depression, Tarim Basin

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Influence of sedimentary microfacies on the rock mechanics of ultra-deep reservoirs and its application: a case study of the Cretaceous formation in the BZ gas field of Kuqa Depression, Tarim Basin

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