大牛地石盒子组致密储层控制因素及岩相研究

Control Factors and Lithofacies Interpretation for Compacted Reservoirs in Shihezi Formation of Daniudi Gas Field

为了解鄂尔多斯盆地大牛地气田石盒子组有利储层的控制因素及展布特征,通过数理统计、回归分析方法,结合薄片分析、粒度分析和物性分析等资料,对鄂尔多斯盆地大牛地气田石盒子组有利储层的控制因素进行了研究,认为粒度和碎屑成分是控制大牛地气田石盒子组储层物性优劣的主要因素,粗粒且富含石英砂岩物性明显较好,利用分析测试资料和测井数据,从粒度和成分入手,实现了储层的测井定量解释;砂岩平面展布表明,研究区西南部的DK26-DK2井区粗粒富含石英砂岩分布广且厚度大,是有利储层发育区。

To better understand the controlling factors and reservoir distribution in Shihezi Formation of Daniudi Gas Field in Ordos Basin,mathematical statistic method and regression method were employed to study the control factors on the favorable reservoirs in Shihezi Formation in combination with thin section analysis,grain size analysis and physical property analysis.It was considered that the grain size and clastic constituents were the key factors controlling the physical characteristics of reservoirs.The coarse-grained quartz-rich sandstone had better physical properties.According to well test and logging data,the quantitative reservoir is interpreted in combination with grain size and composition.The sandstone areal distribution shows that Well DK16-DK2 is a favorable exploration area.