Journal of Southwest Petroleum University(Science & Technology Edition) ›› 2023, Vol. 45 ›› Issue (2): 11-20.DOI: 10.11885/j.issn.1674-5086.2020.11.25.02

• GEOLOGY EXPLORATION • Previous Articles     Next Articles

Characteristics and Main Controlling Factors of High Quality Channel Sandstone Reservoir in Zhongjiang Gas Field

WANG Yongfei, HENG Yong   

  1. Exploration & Production Research Institute, Southwest Petroleum Branch, SINOPEC, Chengdu, Sichuan 610041, China
  • Received:2020-11-25 Published:2023-05-05

Abstract: The sandstone reservoirs of Shaximiao Formation in Zhongjiang Gas Field are generally poor in physical properties. High quality reservoirs are one of the main factors controlling oil and gas enrichment and high yield. The characteristics and controlling factors of high quality reservoir are studied by casting thin section, scanning electron microscope, X diffraction and core physical property analysis data. The results show that the pore types of high quality reservoirs are mainly intergranular dissolved pores and residual intergranular pores, and the diagenetic facies are mainly chlorite cemented facies and chlorite cemented dissolution facies. Early lining chlorite cementation and late dissolution are the key to the formation of high quality reservoirs. Microfractures caused by structural fracture can improve the seepage capacity of reservoirs and promote the formation of high quality reservoirs. The main distributary channel has strong hydrodynamic conditions, large particle size, less argillaceous content and more developed chlorite film in the early stage, which is more conducive to the formation of high-quality reservoirs. The secondary dissolution pores are developed in the secondary distributary channels with high feldspar content, and the reservoirs have good physical properties. Therefore, the high quality reservoirs are mostly developed in the main distributary channels and some secondary distributary channel microfacies with high feldspar content.

Key words: western Sichuan Depression, Shaximiao Formation, channel sandstone, high-quality reservoirs, controlling factors

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