| 致密砂岩气藏储渗单元研究方法与应用:以鄂尔多斯盆地二叠系下石盒子组为例 |
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| 引用本文： | 郭建林,贾成业,闫海军,季丽丹,李易隆,袁贺.致密砂岩气藏储渗单元研究方法与应用:以鄂尔多斯盆地二叠系下石盒子组为例[J].高校地质学报,2018,24(3):412. |
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| 作者姓名： | 郭建林 贾成业 闫海军 季丽丹 李易隆 袁贺 |
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| 摘 要： | 精细表征储层特征和储层结构是致密砂岩气藏开发中后期的主要技术需求。基于不同类型砂体的相似孔渗特征将辫状河沉积体系中河道充填和心滩砂体聚类为储渗单元,提出了储渗单元研究概念和研究思路,开展了辫状河沉积体系储渗单元发育模式研究。通过露头观测和测井相标志,识别出辫状河沉积体系中储渗单元发育四种叠置模式,即心滩叠置型、河道充填叠置型、心滩和河道充填叠置型、心滩或河道充填孤立型;基于储渗单元发育模式,提出了河流相致密砂岩气藏开发井型的适应性,指出辫状河沉积体系中河道叠置带是叠置型储渗单元发育的有利部位,是水平井开发的有利目标,辫状河沉积体系中的过渡带和洼地主要发育孤立型储渗单元,适合直井或丛式井组开发。鄂尔多斯盆地二叠系下石盒子组野外露头研究和苏里格气田加密井区井间干扰试验表明,辫状河沉积体系中储渗单元发育规模为顺古水流方向长600 m和垂直水流方向宽400 m左右,证实苏里格气田具备进一步加密到400×600 m的条件,预计可提高采收率15%～20%。
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| 关 键 词： | 致密砂岩气藏 辫状河沉积体系 储渗单元 叠置模式 开发井型 采收率 |
Research Methodology and Application of Reservoir Permeability Units for Tight Sandstone Gas Reservoirs: A Case Study in the Permian Lower Shihezi Formation of the Ordos Basin |
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| GUO Jianlin,JIA Chengye,YAN Haijun,JI Lidan,LI Yilong,YUAN He.Research Methodology and Application of Reservoir Permeability Units for Tight Sandstone Gas Reservoirs: A Case Study in the Permian Lower Shihezi Formation of the Ordos Basin[J].Geological Journal of China Universities,2018,24(3):412. |
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| Authors: | GUO Jianlin JIA Chengye YAN Haijun JI Lidan LI Yilong YUAN He |
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| Abstract: | Detailed investigation of reservoir characterization and architecture is the main technique requirements for the development
of tight sandstone gas reservoir in the middle-to-later stage. Based on the similarities of porosity and permeability for different types of
sand bodies, channel-filling and channel bar of braided river sedimentary system were classified into the same reservoir permeability
unit. Concept and methodology of such permeability units were put forward and the developmental model in the unit was studied.
Through outcrop observation and analysis of logging facies, four superimposed patterns within the unit were identified, including
channel bar superposition, channel filling superposition, bar and channel filling superposition, and bar or channel filling isolated types.
Based on developmental patterns of the units, well types suitable for the development of tight sandstone gas reservoirs were proposed.
Channel superimposed belts in braided river sedimentary system are favorable for the development of superimposed permeability units
and horizontal drilling. The transition and depression zones of braided river sedimentary system are favorable for the development of
isolated permeability units and vertical or cluster wells. Case studies in the Low Permian Shihezi outcrops of the Ordos Basin and
interference well tests in the pilot infill areas of the Sulige gas field show that permeability units of braided river sedimentary system
have a length of 600 m along the paleocurrent and width of 400 m perpendicular to the flow direction. This implies that the well pattern |
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