鄂尔多斯盆地陇东地区铝土岩储层含气性测井评价方法及其应用  

Logging evaluation method for gas bearing properties of bauxite reservoirs in the Longdong area of Ordos Basin and its application

作　　者：郭笑锴 滕飞启[3,4] 吴明松[3,4] 郝志磊 杨小明[3,4] 徐培裕 张三[4,5] GUO Xiaokai;TENG Feiqi;WU Mingsong;HAO Zhilei;YANG Xiaoming;XU Peiyu;ZHANG San(Geological Research Institute,China National Logging Corporation,Xi’an 710077,China;Well Logging Key Laboratory,China National Petroleum Corporation,Xi’an 710077,China;Research Institute of Exploration and Development,PetroChina Changqing Oilfield Company,Xi’an 710018,China;National Engineering Laboratory for Exploration and Development of Low Permeability Oil and Gas Fields,Xi’an 710018,China;Exploration Division,PetroChina Changqing Oilfield Company,Xi’an 710018,China)

机构地区：[1]中国石油集团测井有限公司地质研究院,陕西西安710077 [2]中国石油集团测井有限公司测井重点实验室,陕西西安710077 [3]中国石油长庆油田分公司勘探开发研究院,陕西西安710018 [4]低渗透油气田勘探开发国家工程实验室,陕西西安710018 [5]中国石油长庆油田分公司勘探事业部,陕西西安710018

出　　处：《天然气地球科学》2024年第8期1454-1466,共13页Natural Gas Geoscience

基　　金：中国石油天然气集团有限公司科学研究与技术开发项目“测井采集处理解释关键技术研究”课题三“测井数字岩石技术研究”(编号:2021DJ4003)资助.

摘　　要：鄂尔多斯盆地陇东地区太原组铝土岩气藏规模相对较小且分布零散,沉积类型多样,岩性多变,物性参数级差大,储层含气性主控因素不明朗,气水关系复杂,试气差异大。从测井角度,深入分析了含铝岩系储层的试气结果与储层岩性厚度、物性、电性之间的关系,明确了影响含铝岩储层产量的主控因素:按照权重依次为岩性均质性、厚度、电性及物性。在此基础上,结合岩性识别和孔隙度计算分岩性建立区域气水识别图版;针对物性较差的含铝岩储层应用图版法存在局限性的问题,在利用声波时差与自然伽马包络面积的含铝岩快速识别方法的基础上,创新建立基于声波时差与自然伽马包络面积累加的岩性均质性指数,进一步结合含气性敏感测井变量孔隙度和电阻率构建了含气信号增强因子定量指示参数和流体敏感因子,可以较为直观地在铝土岩储层进行含气指示,实现了含铝岩储层的有效气水识别;同时,研究基于岩电实验,建立不同类型储集空间的饱和度计算模型,通过定量计算得到表征储层含气性的含水饱和度。研究方法在铝土岩储层新井试气选层、老井复查中应用效果显著,有效提高了测井解释符合率,支撑了区域单井试气选层及气藏认识。The scale of the Taiyuan Formation bauxite gas reservoir in the Longdong area of the Ordos Basin is relatively small and scattered,with diverse sedimentary types,variable lithology,and large differences in physical property parameters.The main controlling factors for gas content in the reservoir are unclear,and the gas water relationship is complex,resulting in significant differences in gas testing.From the perspective of logging,this study conducted an in-depth analysis of the relationship between gas testing results of aluminum bearing rock reservoirs and reservoir lithology thickness,physical properties,and electrical properties.It was clarified that the main factors affecting the production of aluminum bearing rock reservoirs are lithology homogeneity,thickness,electrical properties,and physical properties in order of weight.On this basis,a regional gas and water identification chart is established by combining lithology identification and porosity calculation based on lithology.In response to the limitations of the graphical method in the application of aluminum bearing rock reservoirs with poor physical properties,based on the rapid identification method of aluminum bearing rock using acoustic time difference and natural gamma envelope area,an innovative lithology homogeneity index based on envelope area accumulation is established.Furthermore,combined with gas sensitive logging variables such as porosity and resistivity,a quantitative indicator parameter for gas signal enhancement factor and a fluid sensitivity factor are constructed,which can intuitively indicate gas content in aluminum bearing rock reservoirs and achieve effective gas water identification in aluminum bearing rock reservoirs.At the same time,based on rock electrical experiments,saturation calculation models for different types of reservoir spaces were established,and the water saturation that characterizes the gas content of the reservoir was quantitatively calculated.The application of research methods in gas testing and layer selection

关 键 词：鄂尔多斯盆地 铝土岩 含气性 主控因素 岩性识别 孔隙度 气水识别 

分 类 号：TE122.2[石油与天然气工程—油气勘探]