Evaluation of volcanic reservoirs with the “QAPM mineral model” using a genetic algorithm |
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作者姓名: | Pan Baozhi ;Xue Linfu ;Huang Buzhou ;Yan Guijing ;Zhang Lihua |
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作者单位: | [1]College of Geo-Exploration Science and Technology, Ji Lin University, Changchun 130026, China.; [2]Qingdao Marine Geological Institute, Qingdao, 266071, China. |
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基金项目: | This work was sponsored by the National Natural Science Foundation of China (No. 49894194-4) The authors would like to thank Daqing 0il Company for permission to use the log and core data in Songliao Basin, China, and to publish results of the analysis. |
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摘 要: | Gas-bearing volcanic reservoirs have been found in the deep Songliao Basin, China. Choosing proper interpretation parameters for log evaluation is difficult due to complicated mineral compositions and variable mineral contents. Based on the QAPF classification scheme given by IUGS, we propose a method to determine the mineral contents of volcanic rocks using log data and a genetic algorithm. According to the QAPF scheme, minerals in volcanic rocks are divided into five groups: Q(quartz), A (Alkaline feldspar), P (plagioclase), M (mafic) and F (feldspathoid). We propose a model called QAPM including porosity for the volumetric analysis of reservoirs. The log response equations for density, apparent neutron porosity, transit time, gamma ray and volume photoelectrical cross section index were first established with the mineral parameters obtained from the Schlumberger handbook of log mineral parameters. Then the volumes of the four minerals in the matrix were calculated using the genetic algorithm (GA). The calculated porosity, based on the interpretation parameters, can be compared with core porosity, and the rock names given in the paper based on QAPF classification according to the four mineral contents are compatible with those from the chemical analysis of the core samples.
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关 键 词: | 矿物模型 遗传算法 火山 水库形成 |
收稿时间: | 5 June 2006 |
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