沉积、成岩、构造一体化孔隙度预测模型

An integration porosity forecast model of deposition,diagenesis and structure

以库车前陆盆地白垩系巴什基奇克组砂岩为例,从盆地的构造演化、古应力变化、沉积体系分布、成岩作用类型及强度分析入手,依据大量实验分析资料(岩屑、岩心薄片、岩矿成分、古构造应力、粒度)和测井测试资料,运用地质学、数学及统计学等多学科相结合的方法,对库车坳陷主要产油气层位的孔隙成因机理和变化规律进行了研究,构建了沉积、成岩、构造一体化的孔隙度预测模型。利用该模型对目的层白垩系巴什基奇克组砂岩孔隙度进行了预测,结果与测井解释孔隙度吻合较好,为库车坳陷不同孔隙类型深埋、有效、优质砂岩储集层的空间评价及预测提供了依据。

Taking the Cretaceous Bashijiqike sandstones in the Kuqa foreland basin as an example and starting from the analyses of the tectonic evolution,ancient stress,sedimentary system distribution,diagenesis type and intensity of the basin,the authors studied the porosity formation mechanisms and changes of the main pay zones in the Kuqa Depression and built a porosity forecast model integrating deposition,diagenesis and structure based on a large number of experimental data（cuttings,thin core slices,mineral composition,ancient tectonic stress,particle size） and logging test data and using a multi-disciplinary knowledge of geology,mathematics and statistics.The predicting results of the model in the sandstones of the Bashijiqike Formation matches well with the logging integration porosity,providing a basis for the space evaluation and forecast of deep,effective,high-quality reservoirs of different pore types in the Kuqa Depression.