测井资料在松辽盆地火成岩岩性识别和储层评价中的应用

Application of logging data in lithology identification and reservoir evaluation of igneous rock in Songliao basin

(1.吉林大学地球探测科学与技术学院，吉林长春130026；2.大庆钻探工程公司测井一公司，黑龙江大庆163412）

Geo-exploration Science and Technology College, Changchun 130026, China

松辽盆地火成岩矿物成分复杂，含量变化大，在利用测井资料进行储层评价时存在解释参数选择困难的问题。为此，对松辽盆地火成岩的测井响应特征进行了分析和归纳总结，并应用因子分析法进行了岩性划分。分析了火成岩中的矿物成分，并基于此建立了以矿物为基础并包含孔隙度的体积模型（QAPM模型）；建立了密度、视中子孔隙度、声波时差、伽马射线和体积光电吸收截面指数的测井响应方程，计算了岩石骨架中4种矿物的体积含量，依据国际地质科学联合会提出的火成岩矿物分类方案（QAPF方案）对火成岩进行了分类。利用自主研发的测井资料处理解释软件，对松辽盆地深层火成岩进行了孔隙度和含水饱和度计算，所计算的孔隙度可与岩心分析孔隙度相比，含水饱和度与密闭取心分析结论相吻合。给出的火成岩类型与岩心薄片命名相一致。

The mineral compositions of igneous rock in Songliao basin are complex and its content changes largely, which makes it difficult for selecting interpretation parameters during evaluating reservoirs by logging data. Therefore, the logging responses of igneous rock in the area were analyzed and summarized, and the factor analysis method was adopted to classify lithology. The minerals of igneous formations were described and a bulk volume model (QAPM model) based on mineral and including porosity was established. The logging response equations of density, apparent neutron porosity, acoustic travel time，gamma ray and volume photoelectric cross index were deduced. The volume content of four minerals in matrix was calculated. The igneous rocks were classified according to the international igneous classification scheme (QAPF scheme) proposed by IUGS (International Union of Geological Society). The log data of igneous sections in deep Songliao Basin were processed by using the software developed by authors. The calculated porosity is well coherent with core porosity and the calculated water saturation is also similar to the sealed core analysis. The identified lithology was the same with the core entitles.