测井模糊聚类法在复杂碳酸盐岩气藏含气面积圈定中的应用
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摘要
文章介绍了模糊迭代自组织数据分析技术的算法原理，提出了将该技术用于测井分析进行气水界面确定和含气面积圈定的方法。首先从复杂碳酸盐岩气藏的地质特点出发，充分应用测井信息，在建立复杂碳酸盐岩气水模型的基础上，求准对储层流体识别较敏感的孔隙度、含水饱和度、泥质含量、视地层水电阻率及储渗条件综合判别值等五个参数；再运用模糊迭代自组织数据分析技术，对多井气水干层进行综合评价，从而准确地确定整个构造的气水界面；最后结合地震资料预测与圈定了含气面积，为天然气储量计算提供了有力依据。该方法成果已应用于川东龙门、五百梯和肖家沟等气田，得到了良好的地质印证，在大天池构造带整体综合评价的含气面积圈定上见到了好的地质效果。
Algorithmic principle of fuzzy iterative auto organization data analysis technique is introduced.A method of applying the techniqne to logging analysis to determine gas water interface and delimitate gas bearing area is suggested.First,starting from analysing the geological characteristics of complex carbonate gas reservoir,fully making use of logging data,a gas water model is set up for complex carbonate rock to accurately determine the 5 parameters sensitive to reservoir fluid identification,such as porosity,water saturation,shale content apparent formation water resistivity and the comprehensive discriminant value of reservoir conditions.Then applying fuzzy iterative auto organization data analysis technique,comprehensive evaluation of gas water dry zones for multiwell is conducted to accurately determint the gas water interface of the whole structure.Finally,combining with seismic data gas bearing area is predicted and delimitated.This method has been confirmed by the favourable geological practices in the Longmen,Wubaiti and Xiaojiaogou gas fields in eastern Sichuan,and good geological results are also obtained in the evaluation of the gas bearing area delimitation of Datianchi structure belt.
Algorithmic principle of fuzzy iterative auto organization data analysis technique is introduced.A method of applying the techniqne to logging analysis to determine gas water interface and delimitate gas bearing area is suggested.First,starting from analysing the geological characteristics of complex carbonate gas reservoir,fully making use of logging data,a gas water model is set up for complex carbonate rock to accurately determine the 5 parameters sensitive to reservoir fluid identification,such as porosity,water saturation,shale content apparent formation water resistivity and the comprehensive discriminant value of reservoir conditions.Then applying fuzzy iterative auto organization data analysis technique,comprehensive evaluation of gas water dry zones for multiwell is conducted to accurately determint the gas water interface of the whole structure.Finally,combining with seismic data gas bearing area is predicted and delimitated.This method has been confirmed by the favourable geological practices in the Longmen,Wubaiti and Xiaojiaogou gas fields in eastern Sichuan,and good geological results are also obtained in the evaluation of the gas bearing area delimitation of Datianchi structure belt.
引文
1王碧泉．模式识别理论、方法和应用．地震出版社2李安华，吴达．模糊数学基础及其应用．新疆人民出版社3吴继余．川东裂缝—孔隙型碳酸盐岩储层参数的测井综合解释．天然气工业，1990；（5～6）
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