摘要
文章根据川西致密砂岩气藏的损害特征和现场 10 0多口井的测试资料的统计分析表明 ,储层表现出自身的损害特点 ,其常规的矿场评价指标和标准不一定完全适合非常规的致密碎屑岩气藏的情况。针对川西致密砂岩气藏损害特征 ,提出新的气藏损害的评价标准 ,同时根据致密砂岩气藏油层损害的要求和评价标准的需要 ,建立起新的描述裂缝—孔隙性砂岩气藏损害评价的数学模型 ,该模型在原来裂缝—孔隙性砂岩渗流模型的基础上考虑裂缝与基块之间窜流表皮系数对渗流的影响。将该矿场评价标准和评价方法应用于川西致密砂岩储层的损害评价中取得很好的效果 ,这不仅对于川西致密砂岩的油层损害评价有现实意义 ,而且对裂缝—孔隙油气藏的试井解释和损害评价都具有重要的指导意义。
Based on the damage characteristics of the tight sandstone gas reservoirs in west Sichuan and the statistical analysis of the testing data from more than 100 wells, it is shown that the reservoirs are of the characteristics of self-damage and the conventional field evaluation norms and criteria are not completely sure to suit to the unconventional tight fragmental gas reservoirs. In view of the damage characteristics of the tight sandstone gas reservoirs in West Sichuan, a new criterion for evaluating gas reservoir damage is proposed. In the light of the requirements of the tight sandstone gas reservoir damage and the evaluation criterion, a new mathematical model for describing the porous fractured sandstone gas reservoir damage evaluation is set up. In this model, the effect of the channelling skin factor between the fracture and matrix on the percolation flow is considered on the basis of the original percolation flow model for fractured porous sandstone. By applying this field evaluation criterion and method to the damage evaluation of the tight sandstone reservoirs in West Sichuan, a good result has been obtained, which not only has a practical significance for evaluating the tight sandstone reservoir damage evaluation but also has an important directive function both in the well test interpretation of the fractured-porous oil and gas reservoirs and their damage evaluation.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2001年第5期74-76,共3页
Natural Gas Industry
基金
"九五"国家重点科技攻关项目 (96 - 110 - 0 3- 0 4- 0 1)部分成果
关键词
致密砂岩气藏
储集层
评价
不稳定试井
表皮系数
地层损害
裂缝
四川盆地
Fracturing (oil wells)
Mathematical models
Oil well testing
Percolation (fluids)
Porosity
Sandstone
Statistical methods
