收稿日期: 2015-02-23
修回日期: 2015-07-12
网络出版日期: 2016-01-10
基金资助
国家自然科学基金面上项目(编号：41372139；41072098)；国家科技重大专项专题(编号：2011ZX05018-001-002；2011ZX05009-002-205；2011ZX05033-004;2016ZX05046-003)联合资助.
Gas saturation logging evaluation of partially saturated tight sandstone reservoir
Received date: 2015-02-23
Revised date: 2015-07-12
Online published: 2016-01-10
川西须家河组致密砂岩储层经历了复杂沉积、成岩及构造演化过程，储层物性及含气性在纵横向上均具有较强的非均质性。加强致密储层含气饱和度(Sg)测井对比研究，对深入研究储层气水分布、寻找优质储层及井间含气性对比具有重要意义。基于常规及特殊测井资料，从电学及声学角度出发，分别基于Archie公式及三相Biot-type方程(TPE)对川西须家河组致密砂岩储层岩石含气饱和度进行精细测井解释。研究结果表明，当模型参数选取适当条件下，2种方法均可获得良好的评价效果；确定了电学Archie公式(及其修正公式)方法的Archie常数，可为同类研究提供参考，泥质含量对该方法评价效果具有一定影响。利用TPE对Sg进行测井解释时，通过自适应方法获取地层固结参数α值，发现α值与电阻率的对数值之间满足幂指数关系，利用该定量关系可以对地层α进行预测；TPE评价方法受泥质含量影响较小，但会受地层真实Sg的影响，当真实Sg低于60%时Sg预测效果较好，而高于此值时，预测结果略微偏低。由于高含气饱和度不是导致声波频散和衰减的主要原因，因此该现象与岩石自身因素，即基质矿物组成、内部颗粒微观接触型式及孔—裂隙结构等方面因素有关。基于以上认识，根据实际资料掌握程度，可以优选适当方法对非饱和致密砂岩储层Sg进行精细测井解释。
尹帅，丁文龙，黄昌杰，肖子亢，周学慧 . 非饱和致密砂岩储层含气饱和度测井评价[J]. 天然气地球科学, 2016 , 27(1) : 156 -165 . DOI: 10.11764/j.issn.1672-1926.2016.01.0156
The tight sandstone reservoir in the Xujiahe Formation of western Sichuan Basin has experienced a complex sedimentation,diagenesis and tectonic evolution process.The reservoir physical properties and hydrocarbon content have strong heterogeneity in both vertical and horizontal directions.Strengthening the logging contrast research of dense reservoir gas saturation has great significance for further study of gas and water distribution,looking for high quality reservoir,and contrast between interwell hydrocarbon showings.In this paper,based on the conventional and special logging data of tight sandstone reservoir,we made logging interpretation of gas saturation using the Archie formula and three-phase Biot-type equation (TPE) respectively.It showed that,when the selection of various parameters is appropriate,they can both achieve good evaluation effect.The value of undetermined constant of this tight sandstone reservoir using the Archie formula and its corrected formula can provide a reference for similar research.The effect of evaluation based on the electrical method is greatly influenced by the shale content.When making logging interpretation of gas saturation using the TPE method,obtaining the consolidation parameter α through adaptive method,we found that there’s good power relationship between α and the resistivity log,and we can use this formula to predict α .This acoustic evaluation method is seldom affected by the shale content,but it can be affected by the true gas saturation of formation.When the true gas saturation of formation is lower than 60%,the prediction effect was good,but when it is higher than this value,the prediction result is lower.Because that the high saturation is not the main reason for acoustic dispersion and attenuation,this phenomenon is mainly correlated with the rock itself,such as the matrix mineral composition,internal particles microscopic contact type and the pore-crack structure.Based on the above understanding,we can select appropriate method to make fine logging interpretation of partially saturated tight sandstone reservoir according to the master degree of actual data that we have got.
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