基于神经网络模型的致密砂岩储层流动单元分类与评价——以鄂尔多斯盆地WQ北部长6油层组为例  

Classification and Evaluation of Flow Units in Tight Sandstone Reservoirs Based on Neural Network Model:A Case Study of Chang 6 Oil Reservoir in Northern WQ Area of Ordos Basin

作　　者：崔英敏 杨江宇 饶利平 杨帅 蒋钧 路宽一 严昌鹏 CUI Yingmin;YANG Jiangyu;RAO Liping;YANG Shuai;JIANG Jun;LU Kuanyi;YAN Changpeng(Changqing Industrial Group Co.,Ltd.,Xi’an,Shaanxi 710018,China;No.9 Oil Production Plant,PetroChina Changqing Oilfield Company,Yinchuan,Ningxia 750005,China)

机构地区：[1]长庆实业集团有限公司,陕西西安710018 [2]中国石油长庆油田分公司第九采油厂,宁夏银川750005

出　　处：《西安石油大学学报（自然科学版）》2024年第2期22-30,共9页Journal of Xi’an Shiyou University（Natural Science Edition）

基　　金：国家油气重大专项项目(2016ZX05046-002)。

摘　　要：为了明确鄂尔多斯盆地WQ北部地区致密砂岩储层流动单元对剩余油分布的影响,通过岩心观察、铸体薄片鉴定、X衍射分析、高压压汞测试等方法分析了研究区长6储层的基本特征,并结合测井和神经网络模型分析,明确了区内长6储层流动单元类型、特征、分布规律,及其与储层的关系。结果表明:研究区长6油层组为典型的低孔-特低渗储层,主要发育长石砂岩和长石岩屑砂岩,孔隙类型以残余粒间孔和长石溶孔为主,储层孔隙结构以细喉大孔型和细喉小孔型为主。共发育4类储层流动单元。其中,长6^(2-1)小层以Ⅲ、Ⅳ类单元为主,长6^(1-2)小层主要发育Ⅰ、Ⅱ类流动单元,长6^(1-1)小层仅见零星分布的Ⅰ类流动单元,有利储层主要分布在长61-2小层。In order to clarify the impact of flow units in tight sandstone reservoirs in the northern WQ region of Ordos Basin on the distribution of remaining oil,the basic characteristics of the Chang 6 reservoir in the study area were analyzed by means of core observation,casting thin section identification,X-ray diffraction analysis,and high-pressure mercury injection testing.The types,characteristics,distribution patterns of flow units in Chang 6 reservoir and their relationship with the reservoir were analyzed in combination with logging data and neural network model analysis.The results show that the Chang 6 oil reservoir in the study area is typical low porosity-ultralow permeability reservoir,which is dominated by the rock types of feldspar sandstone and feldspar lithic sandstone.The pore types are mainly residual intergranular pore and feldspar dissolution pore,and characterized by the pore structures of fine throat-large pore and fine throat-small pore.Four types of reservoir flow units are developed in the Chang 6 oil reservoir in the study area.TypeⅢandⅣflow units mainly developed in the Chang 6^(2-1)sublayer,type I andⅡflow units mainly developed in the Chang 6^(1-2)sublayer,and the Chang 6^(1-1)sublayer only shows sporadic distribution of type I flow unit.The favorable reservoirs are majorly distributed in the Chang 6^(1-2) sublayer.

关 键 词：流动单元 储层评价 致密砂岩 长6油层组 鄂尔多斯盆地 

分 类 号：TE122[石油与天然气工程—油气勘探]