Reservoir Geomechanical Characteristics and the Influence on Development in Keshen Gas Field

doi:10.11885/j.issn.1674-5086.2020.04.09.01

Abstract

Abstract: The fractured sandstone reservoir has experienced strong compression structure deformation in deep zone of Kelasu tectonic zone. Complex current in-situ stress field and natural fracture system lead to strong heterogeneity and anisotropy of reservoir. There were obvious differences in gas well productivity between different structures and at different locations of the same structure. In order to clarify the main controlling geological factors affecting the development of natural gas in this area, the research on reservoir geomechanical modeling of Keshen Gas Field was carried out based on the evaluation of 1 D geomechanical parameters and the construction of structural framework. The rock mechanics properties, present in-situ stress field and development characteristics of natural fractures of reservoirs in several structural belts of Keshen Gas Field are analyzed in depth. The geomechanical characteristics of reservoirs in different structural belts, different parts of the same structural belt and different horizons are summarized respectively. Combining with the development status of typical wells in Keshen Gas Field, the relationship between geomechanical characteristics and productivity is established. Finally, the matching well distribution principles are proposed for different types of gas reservoirs. It is shown that: (1) the distribution characteristics of in-situ stress field in different structural types of gas reservoirs are quite different, and the relationship between stress orientation and natural fracture occurrence is also distinctly different; (2) geomechanical properties of reservoirs in gas reservoirs show selfstratification characteristics, which directly affect the distribution of reservoir porosity and permeability; and (3) gas reservoirs are located in low stress value, small angle between fracture strike and horizontal principal stress orientation, good permeability and higher productivity of single well. The research not only provides a useful supplement for reservoir evaluation and gas reservoir description, but also promotes well location optimization of development plan.

Key words: Keshen Gas Field, fractured sandstone, reservoir geomechanics, current in-situ stress, natural fractures, productivity

CLC Number:

TE122

JIANG Tongwen, ZHANG Hui, XU Ke, WANG Zhimin, WANG Haiying. Reservoir Geomechanical Characteristics and the Influence on Development in Keshen Gas Field[J]. 西南石油大学学报(自然科学版), 2020, 42(4): 1-12.

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