Typical difference analysis and benefit-oriented development countermeasures of normal and high pressure shale gas in southeastern Chongqing

ZHOU Dehua; HE Xipeng; ZHANG Peixian

doi:10.11781/sysydz2023061109

Volume 45 Issue 6

Nov. 2023

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ZHOU Dehua, HE Xipeng, ZHANG Peixian. Typical difference analysis and benefit-oriented development countermeasures of normal and high pressure shale gas in southeastern Chongqing[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2023, 45(6): 1109-1120. doi: 10.11781/sysydz2023061109

Citation:

ZHOU Dehua, HE Xipeng, ZHANG Peixian. Typical difference analysis and benefit-oriented development countermeasures of normal and high pressure shale gas in southeastern Chongqing[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2023, 45(6): 1109-1120. doi: 10.11781/sysydz2023061109

Citation:

ZHOU Dehua, HE Xipeng, ZHANG Peixian. Typical difference analysis and benefit-oriented development countermeasures of normal and high pressure shale gas in southeastern Chongqing[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2023, 45(6): 1109-1120. doi: 10.11781/sysydz2023061109

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Typical difference analysis and benefit-oriented development countermeasures of normal and high pressure shale gas in southeastern Chongqing

doi: 10.11781/sysydz2023061109

1.
SINOPEC Oilfield Exploration and Development Division, Beijing 100728, China
2.
SINOPEC East China Branch Company, Nanjing, Jiangsu 210019, China
3.
Research Institute of Exploration and Development, SINOPEC East China Branch Company, Nanjing, Jiangsu 210019, China

Received Date: 2023-09-02
Rev Recd Date: 2023-10-13
Publish Date: 2023-11-28

Abstract

Abstract

Southeastern Chongqing is located in the transition zone of the southeastern margin of Sichuan Basin. Shale gas reservoirs of normal and high pressure are developed in this area. In order to promote normal pressure shale gas development benefits, starting from the typical difference analysis of normal and high pressure shale gas, through the research of drilling, core observation, experimental analysis, accumulation conditions, and production dynamics, combined with shale gas exploration and development practices in southeastern Chongqing, it is clarified that the normal pressure shale gas has the typical geological characteristics of small thickness of high-quality shale, low porosity, poor preservation conditions, and medium gas content. The accumulation of normal pressure shale gas is controlled by sedimentary facies, preservation conditions, and in-situ stress field. Affected by multi-stage structural transformation and differential uplift, the mechanism of normal pressure shale gas generation is complex, which has the characteristics of low initial production, short stable production period, slow decline, and high flowback rate. There are obvious differences between normal and high pressure shale gas in geological characteristics, enrichment regularities, generation mechanism, and production law. Considering the poor grade of normal pressure shale gas resources in southeastern Chongqing, four key countermeasures for the benefit-based development of normal pressure shale gas are put forward: (1) The basic geological research is furthered and the enrichment regularities and sweet spots are clarified. (2) The development technology of variable well spacing, long horizontal section, small inclined angle, strong transformation, low height difference and controlled pressure difference is established to increase the production of single well. (3) The innovation of engineering technology such as low-cost drilling and efficient fracturing is increased to achieve speed acceleration, efficiency improvement, and cost reduction. (4) The institutional mechanism is innovated and an efficient organization and operation mode is created. The four key countermeasures effectively promote the transformation of normal pressure shale gas from resources to reserves and from reserves to benefits, facilitating the efficient development of normal pressure shale gas in southeastern Chongqing.
- geological characteristics,
- difference,
- efficient development countermeasures,
- normal pressure shale gas,
- southeastern Chongqing

All authors disclose no relevant conflict of interests.
ZHOU Dehua proposed the overall idea of the paper and was responsible for the compilation of production characteristics and development countermeasures. HE Xipeng was responsible for the introduction and geological characteristics. ZHANG Peixian was responsible for the compilation and revision of the paper. All authors have read and approved the submission of the final manuscript.

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References(31)

References

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Typical difference analysis and benefit-oriented development countermeasures of normal and high pressure shale gas in southeastern Chongqing

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Typical difference analysis and benefit-oriented development countermeasures of normal and high pressure shale gas in southeastern Chongqing

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