张家湾地区长2储层沉积微相研究

Study on sedimentary micro facies of the Chang2 reservoir in Zhangjiawan

张家湾地区长2油层开发程度较高,但油气富集规律复杂,开发难度较大。在岩心、测井资料分析的基础上,对研究区长2油层组的沉积微相特征及各小层沉积微相平面展布特征进行了深入的研究。结果表明:张家湾地区长2油层组主要为灰色细-中粒长石砂岩,主要为三角洲平原亚相沉积,包括水下分流河道、天然堤、决口扇和泛滥平原4种沉积微相。沉积微相对储层物性和油气富集的控制作用明显,其中水下分流河道为主要微相,长22为主要含油层。

Chang 2 reservoir in Zhangjiawan area development degree is high,but research has not been done deeply,the oil and gas accumulation is complex,it is difficult to develop.Based on the outcrop observation,core description and logging data analysis,the characteristics of sedimentary micro facies and the distribution of micro facies in each layer of Chang 2 reser- voir in Zhangjiawan area are systematically studied.The results show that Chang 2 reservoir in Zhangjiawan area is mainly composed of gray fine- sandstone.Delta plain subfacies deposition are the main deposits in Chang 2 reservoir in Zhangjiawan area.Mainly includes four micro facies, which are the underwater distributary channel,natural levee,crevasse splay and flood plain facies.The controlling role of sedimentary micro facies to layer physical property and bydrocarbon enrichment is obvious.The frame micro facies,which is the most underwater distributary channel is Chang2 formation＇s advantageous oil gas enrichment zone.Chang22 is the main oil-bearing.