准噶尔盆地玛湖凹陷玛页1井二叠系风城组全井段岩心剖析与油气地质意义

doi:10.13809/j.cnki.cn32-1825/te.2022.01.018

Abstract

Abstract:

Mahu sag is an important hydrocarbon-generating sag in Junggar Basin. The whole well section in Fengcheng Formation of Well-MY1, which is located in the north of the sag, has been continuously coring. Therefore, the coexisting characteristics of conventional and unconventional reservoirs in Fengcheng Formation are revealed by the combination of the systematic description and analysis of core characteristics with the analysis of high-density sampling and electrical/nuclear magnetic resonance. The main conventional reservoirs are volcanic rocks, glutenite and sandstone, which is developed in the low stage freshwater or low salinity water body. The main unconventional reservoirs are mud-stone, dolomite and siltstone, which is developed in the weak hydrodynamic conditions and strong evaporation environment. On this basis, with the comprehensive analysis of lithology, electrical properties, physical properties, oil content and other characteristics, it is further confirmed that there is one conventional “sweet spot” and three unconventional “sweet spot” in Fengcheng Formation of Well-MY1, and the conventional “sweet spot” is developed in the middle and lower part of 1st member of Fengcheng Formation, the unconventional “sweet spot” is developed in the lower part of 3rd member and the 2nd member of Fengcheng Formation. The core analysis and features of Fengcheng Formation in Well-MY1 further confirms the hydrocarbon resource potential of alkali lake deposit, and lays a foundation for the establishment of “Standard Lithology Profile” of Fengcheng Formation in Mahu sag.

Key words: core analysis, alkali lake deposit, sweet spot, shale oil, Fengcheng Formation, Mahu depression

CLC Number:

TE122

Yongxin QIAN,Yang ZOU,Xinmei ZHAO, et al. Full core analysis and petroleum geological significance of Permian Fengcheng Formation in Well-MY1, Mahu Sag[J]. Reservoir Evaluation and Development, 2022, 12(1): 204-214.

Figures/Tables 10

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Full core analysis and petroleum geological significance of Permian Fengcheng Formation in Well-MY1, Mahu Sag

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