建立辫状河储层地质模型的露头调查———以张家口地区为例

摘 要　 根据储层沉积学原理?对张家口地区辫状河砂体的成因进行分析?划分出3级层次 界面和6种岩石相类型?对沉积、成岩作用与储层物性的关系进行了探讨。指出：沉积作用 是影响砂体物性的主要因素?成岩作用对物性的改造受沉积作用控制；砂岩物性和粒度中值 及泥质含量密切相关?胶结物对孔隙度有一定影响?对渗透率影响较弱。各次洪泛事件的能 量大小控制了有利储集带的分布。最后建立了辫状河砂体的一维和二维储层地质模型。

AN OUTCROP SURVEY FOR BRAIDED RIVER RESERVOIR MODELING A CASE FROM ZHANGJIAKOU REGION

Based on the fundamental principle of reservoir sedimentology, the formation mechanism of the braided river sandbodies in Zhangjiakou region is analyzed in this paper. Three orders of bounding surfaces and six types of lithofacies of the sandbodlies are identified, and the influence of sedimentation and diagenesis on reservoir properties is discussed. It is proved that sedimentation is the dominant factor affecting reservoir properties, and the influence of diagenesis on reservoir properties is determined by sedimentation. There is an intimate relationship between reservoir properties and middle grain size and mud content. Cements has a greater influence on porosity than on permeability. The hydraulic energy of each flooding event controls the distribution of favorable reservoirs. At last, a 1 D and a 2 D geological reservoir models are established, these models should be helpful for oil development.