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

摘要/Abstract

摘要： 川西坳陷侏罗系砂岩储层具有低渗致密的特点，主要为三角洲相分流河道沉积。河道纵向叠置关系复杂、砂岩厚度薄、岩性及物性横向变化明显，但地震资料分辨率有限，河道砂岩储层预测及刻画难度大，制约着开发目标评价及井网部署。采用从宏观到微观、从定性到定量、从外形精细刻画至内幕非均质性评价逐步逼近的综合研究思路，重点集成了井-震一体化河道沉积层序识别、河道砂体叠加样式正演、相带空间刻画和递进反演相控储层定量描述等关键技术，解决了河道期次划分、叠置样式预测、外形刻画和定量描述等多个难题，实现以单河道为单元的气藏精细开发目标评价，取得了明显的应用效果，并形成了陆相致密气藏河道砂岩储层精细刻画与描述技术体系。

关键词: 层序, 相带, 河道砂岩, 储层, 岩性气藏, 川西坳陷

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

中图分类号:

TE121.3

武恒志,叶泰然,赵迪,等. 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[J]. 石油与天然气地质, 2015, 36(2): 230-239. doi: 10.11743/ogg20150207 Wu Hengzhi,Ye Tairan,Zhao Di,et al. 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. doi: 10.11743/ogg20150207

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