摘要
鄂尔多斯盆地作为我国战略性能源基地,其深层(埋深>2 000 m)煤岩气资源潜力巨大,被视作继页岩气、致密气之后非常规天然气勘探开发的重要接替领域。当前产业发展的核心挑战在于如何通过多维度数据融合与智能化技术手段,精准定位兼具“高含气性、高可压性”特征的甜点层段,以实现资源的经济高效开发。针对这一技术瓶颈,创新性构建了“气体录井-岩石热解录井-元素录井”三位一体评价体系,即通过解析储集性、烃源岩特性、含气性、流动性、脆性,建立含气性动态表征模型、渗流能力分级标准及脆性指数计算方程,最终建立本溪组8#煤层煤岩气储层分级评价标准(Ⅰ、Ⅱ、Ⅲ类),形成“数据采集-模型构建-现场验证”的螺旋式认知提升机制。实践表明,该体系显著提升了储层评价效率与精度,甜点识别效率较传统方法提高约20%,典型区块Ⅰ类储层预测准确率超过85%。研究成果已在鄂尔多斯盆地多个重点区块推广应用,展现出良好的适应性和推广价值,为深层非常规气藏开发提供了可复制的技术范式。
As a strategic energy base in China,the potential of deep coal-rock gas resource in the Ordos Basin(buried depth more than 200o m)is huge and is regarded as another important area for unconventional natural gas exploration and development after shale gas and tight gas.The core challenge of current industrial development is how to accurately locate sweet spots layers with the characteristics of"high gas content and high compressibility"through the multi-dimensional data integration and intelligent technical means,so as to achieve economic and efficient development of resources.In response to this technical bottleneck,a trinity evaluation system of"gas mud logging-rock pyrolysis logging-element logging"is innovatively built.That is to say,by analyzing reservoir property,source rock,gas content,flowability and brittleness,a gasbearing dynamic characterization model,seepage capacity classification standard and brittleness index calculation equation are established.In the end,classification evaluation standards for coal-rock gas reservoirs in the 8#coal seam of Benxi Formation(types I,II and II)are established,and a spiral cognitive improvement mechanism of"data acquistion-model constructionsite verification"is formed.The results show that this system has significantly improved the efficiency and accuracy of reservoir evaluation.The sweet spot identification efficiency is increased by about 20%compared with traditional methods,and the prediction accuracy rate of type I reservoirs in typical blocks exceeds 85%.The research results have been promoted and applied in many key blocks in the Ordos Basin,showing good adaptability and promotion value,which provide a replicable technical paradigm for the development of deep unconventional gas reservoirs.
作者
张贵军
黄子舰
方铁园
焦艳爽
姚远
张丽薇
ZHANG Guijun;HUANG Zijian;FANG Tieyuan;JIAO Yanshuang;YAO Yuan;ZHANG Liwei(Engineering Technology Supervision Center of PetroChina Changqing Oilfield Company,Xi′an,Shaanxi 710201,China;Panjin Zhonglu Oil&Gas Technology Service Co.,Ltd.,Panjin,Liaoning 124013,China)
出处
《录井工程》
2025年第4期97-102,共6页
Mud Logging Engineering
关键词
鄂尔多斯盆地
深层煤岩气
录井
甜点
解释评价
Ordos Basin
deep coal-rock gas
mud logging
sweet spot
interpretation and evaluation
