Characteristics and Controlling Factors of Weakly Cemented Glutenite Reservoir in Permian Upper Urho Formation, South Slope of Mahu Sag

doi:10.3969/j.issn.1006-6535.2022.01.004

Abstract

Abstract: In order to identify the influence of weakly cemented glutenite reservoirs in the Permian Upper Urho Formation, south slope of Mahu Sag, Junggar Basin, the reservoirs in the study area were studied for reservoir characteristics and controlling factors on the basis of experimental data such as core observation, slice identification, and analysis of chemical examinations. The results of the study showed that the reservoir in the Upper Urho Formation was a weakly cemented glutenite reservoir with low porosity and permeability, mudstone filling at bottom, low structural maturity and composition maturity. The type of pores was dominated by residual inter-granular pores, and there are three types of storage spaces: 1) macro-porous and meso-porous medium to thin throats, 2) micro-porous thin throats, and 3) micropores and fractures; the average porosity of the first type of reservoir was greater than 9.0% and the average permeability was greater than 10.000 mD, showing the pore structure features of macro-porous and meso-porous medium to thin throats. The reservoir quality is directly controlled by the sedimentary environment, and the microfacies in subaqueous distributary channel at the front edge of the delta fan were high-quality reservoir sedimentary facies. The palaeogeomorphic characteristics indirectly affect the reservoir physical properties, with strong hydrodynamics, low shale content and good physical properties in the paleotrench area. The diagenesis in the study area was dominated by compaction, and the improvement of the reservoir space was limited. The gravel support inhibited the compaction, so that a large number of primary inter-granular pores could be preserved. The results enrich the glutenite reservoir characteristics of Permian Upper Urho Formation, south slope of Mahu Sag, and have a certain guiding significance for the further study of glutenite reservoir.

Key words: reservoir characteristics, weakly cemented glutenite, shale content, Upper Urho Formation, Junggar Basin

CLC Number:

TE122

Wang Ran, Zheng Menglin, Yang Sen, Zhao Xinmei, Jiang Yiyang, Wan Min. Characteristics and Controlling Factors of Weakly Cemented Glutenite Reservoir in Permian Upper Urho Formation, South Slope of Mahu Sag[J]. Special Oil & Gas Reservoirs, 2022, 29(1): 23-30.

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