鄂尔多斯盆地W19-L36区块长2储层沉积特征研究

Study on the sedimentary characteristics of the Chang 2 reservoir at block W19 -L36 well area in Ordos basin

W19-L36区块位于鄂尔多斯盆地陕北斜坡的中部。区内储层沉积特征对油田的开发和增产具有重要意义。本文在沉积岩石学、储层地质学等学科理论和方法的基础上，结合已获得的有关测井、测试资料，对研究区长2油层的沉积特征进行研究。结果显示，本区长2油层组主要以辨状河沉积为主，主要微相类型为分流河道、河漫滩与河间洼地。长2^1-3油层组是研究区主要的含油层位，砂体延北东一南西方向呈条带状展布。

W19 -L36 well area is located in the middle part of Ordos basin. The reservoir sedimentary characteristics in the study area are of great significance to the development and yield - increasing of oil field. Based on the sedimentary petrology ,reservoir geology and other theories and methods, and combining with the acquired related well - logging and testing data,it conducts research on the sedimentary characteristics of the Chang 2 reservoir. The results show that the study area of Chang 2 is mainly dominated by discernible river deposit,including the main microfacies types：the distributary channel, the flood plain and the odsinterfluve depressions. The Chang 21 -3 oil layer is the main oil - bearing layer in the research area,and the sand body shows a ribbon spreading in the North east -south west direction.