基于Xu-White模型的致密砂岩储层含气性评价  

Gas-bearing property evaluation of tight sandstone reservoir based on Xu-White model

作　　者：张鹏[1,2] 杨巧云 范宜仁[3] 张云 张海涛[4] ZHANG Peng;YANG Qiaoyun;FAN Yiren;ZHANG Yun;ZHANG Haitao(No.1 Gas Production Plant,PetroChina Changqing Oilfield Company,Xi'an 710021,China;Project Group for Evaluation and Excavation of Qiankou GasWell,PetroChina Changqing Oilfield Company,Xi'an 710018,China;School of Geosciences,China University of Petroleum(East China),Qingdao 266580,Shandong,China;Research Institute of Exploration and Development,PetroChina Changqing Oilfield Company,Xi'an 710018,China)

机构地区：[1]中国石油长庆油田分公司第一采气厂,西安710021 [2]中国石油长庆油田分公司千口气井评价挖潜工程项目组,西安710018 [3]中国石油大学(华东)地球科学与技术学院,山东青岛266580 [4]中国石油长庆油田分公司勘探开发研究院,西安710018

出　　处：《岩性油气藏》2020年第6期138-145,共8页Lithologic Reservoirs

基　　金：国家油气重大专项“陆相强非均质性页岩储层品质测井评价方法研究”(编号:2017ZX05039-002);国家自然科学基金项目“岩溶储层小型缝洞体三轴感应测井响应数值/物理模拟研究”(编号:41674131)联合资助。

摘　　要：鄂尔多斯盆地东部致密砂岩储层属于典型的岩性气藏,储层物性差、储集空间有限、孔隙结构复杂,常规测井资料易受岩石骨架影响,孔隙流体对其响应特征的贡献小,测井曲线难以有效突出反映孔隙流体的信息,导致气层识别难度大。为了解决这一难题,基于Xu-White模型,利用阵列声波测井资料,结合Biot-Gassmann方程和流体替换模型,获取纵横波速度比差值、体积模量差值等含气敏感参数和含气指示因子,提出了一种识别致密砂岩气层的新方法。结果表明:阵列声波测井能够提供反映地层骨架和流体特征的声学信息,是致密砂岩储层含气性评价的有效手段;体积模量差值和含气指示因子识别准确度较高,含气性评价效果较好,而纵横波速度比差值评价效果较差。通过实际资料处理和试气资料成果验证,该方法评价鄂尔多斯盆地东部致密砂岩储层的含气性具有较高的有效性,同时可为其他地区同类致密砂岩储层含气性评价提供技术支持。The tight sandstone reservoir in eastern Ordos Basin is a typical lithologic gas reservoir,with poor physical properties,limited reservoir space and complex pore structure. The conventional logging data is easily influenced by rock matrix,pore fluid makes little contribution to its response characteristics,and well logging curve is difficult to highlight the information of pore fluid effectively,which leads to gas identification difficultly. In order to solve this problem effectively,a new method for identifying gas-bearing tight sandstone gas reservoir was proposed by obtaining gas-bearing indicator factor and gas-bearing sensitive parameters such as P-S-wave velocity ratio difference,bulk modulus difference,which is based on Xu-White model,array acoustic logging data,BiotGassmann equation and fluid replacement model. The results show that array acoustic logging can get real acoustic information reflecting the real framework and fluid characteristics of the formation,so it is an effective method for gas-bearing property evaluation of tight sandstone reservoirs. The accuracy of identification of tight sandstone gas reservoir by bulk modulus difference and gas-bearing indicator factor is high,and the gas-bearing property evaluation effect is good,while the evaluation effect of P-S velocity ratio difference is poor. According to actual data processing and gas test data,this method achieved good results in gas-bearing property evaluation of tight sandstone reservoir in eastern Ordos Basin,meanwhile it can provide some technical support for gas-bearing property evaluation of similar tight sandstone reservoirs in other areas.

关 键 词：XU-WHITE模型 Biot-Gassmann方程 阵列声波测井 致密砂岩储层 气层识别 

分 类 号：P631.81[天文地球—地质矿产勘探]