页岩含气量测井评价方法研究  

Logging Evaluation of Shale Gas Content

作　　者：夏宏泉[1,2] 刘畅 王瀚玮[1,2] 赵昊 周灵烨 Xia Hongquan;Liu Chang;Wang Hanwei;Zhao Hao;Zhou Lingye(Southwest Petroleum University , Chengdu, Sichuan 610500, China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation (Southwest Petroleum University), Chengdu, Sichuan 610500, China;Sichuan Changning Natural Gas Development Co., Ltd., Chengdu, Sichuan 610000, China)

机构地区：[1]西南石油大学,四川成都610500 [2]油气藏地质及开发工程国家重点实验室,四川成都610500 [3]四川长宁天然气开发有限责任公司,四川成都610000

出　　处：《特种油气藏》2019年第3期1-6,共6页Special Oil & Gas Reservoirs

基　　金：国家重点基础研究发展计划“973”计划“页岩气水平井钻完井关键基础研究”(2013CB228003)

摘　　要：针对现有页岩含气量计算模型关键参数计算困难、误差较大,部分参数需要通过大量的实验来获取,成本较高等问题,以长宁地区下志留系龙马溪组为例,以兰格缪尔等温吸附为理论依据,利用等温吸附实验数据和大量测井数据,通过优选拟合回归的方法计算页岩含气量关键参数,由此建立了基于常规测井资料的页岩含气量计算新模型。结果表明:兰格缪尔等温吸附方程关键参数VP、VL可利用TOC进行计算; SGR、DEN测井曲线计算的TOC比传统△logR法计算结果相对误差降低14. 00%;阿尔齐法和西门度法受异常电阻率低值影响,计算的含气饱和度偏低,SGR-DEN法计算的含气饱和度更加准确。新模型只需通过常规测井曲线即可计算页岩含气量,为页岩气水平井地质导向钻井和储层评价提供了可靠依据。The present shale gas content determination models are partly limited by key parameter calculation,relative large error,the determination of some parameters need a large number of laboratory experiment data,high cost,etc. Based on the Langmuir isothermal adsorption,the isothermal adsorption test and logging data were used to study the Longmaxi Formation of the Lower Silurian in Changning. The fitting regression was optimized to gain the key parameters to calculate shale gas content. A new model for shale gas content calculation was established on the basis of conventional logging data. Research indicates that The VPand VLof the Langmuir isotherm equation can be calculated by TOC. Comparing with the TOC calculation with conventional △logR method,the relative error can be reduced by 14% for the TOC calculation with SGR and DEN logging data. The Alzheimer and Simon methods are influenced by the low value of the anomalous resistivity,which will underestimate the gas saturation. SGR-DEN method could supply a reasonable gas saturation calculation. The new model can calculate the shale gas content with conventional logging curve,which could provide certain reliable basis for the horizontal well drilling with geo-steering and reservoir evaluation.

关 键 词：页岩气 等温吸附 吸附气含量 游离气含量 测井评价 

分 类 号：TE132.2[石油与天然气工程—油气勘探]