川西坳陷陆相致密气藏河道砂岩储层精细刻画技术及其应用

doi:10.11743/ogg20150207

Abstract

Abstract: The Jurassic sandstone reservoirs in western Sichuan Depression are mainly of delta distributary channel depo-sits,featuring in tightness and low permeability.The channel sands are complex invertical superimposition,small in thickness,and large in variations of lithology and poroperm characteristics.It is difficult to predict and characterize those reservoirs due to the limited seismic resolution,constraining target evaluation and well pattern deployment.A comprehensive method was adopted to study the reservoirs from macroscopic to microscopic observation,from qualitative to quantitative analysis and from appearance description to internal heterogeneity evaluation.Several key techniques were proposed,including channel sedimentary sequence identification,forward modeling of stacked channel sands,description of space distribution of facies and quantitative characterization of reservoirs based on progressive inversion.They were successfully used in subdivision of channel sequence,prediction of stacking pattern and quantitative description of appearance,making it possible to perform fine evaluation of development target with single channel as an appraisal unit.A technology system was established for fine description and characterization of continental channel sands in tight-gas reservoirs.

Key words: sequence, facies belt, channel sandstone, reservoir, lithologic gas reservoir, western Sichuan Depression

CLC Number:

TE121.3

Wu Hengzhi, Ye Tairan, Zhao Di, Ma Ruhui. Fine characterization technique and its application to channel sandstone in continental tight gas reservoirs of western Sichuan Depression[J]. Oil & Gas Geology, 2015, 36(2): 230-239.

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Fine characterization technique and its application to channel sandstone in continental tight gas reservoirs of western Sichuan Depression

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