基于体积模量的储层含气性定量评价方法  

Quantitative Evaluation Method of Gas Bearing Based on Volume Modulus in Reservoir

作　　者：孙小平 刘春雷 李贵梅 李娜[2,5] 李亚锋 黄平[4] 李新进 SUN Xiaoping;LIU Chunlei;LI Guimei;LI Na;LI Yafeng;HUANG Ping;LI Xinjin(Department of Gas Field Development,Changqing Oilfield Company,CNPC,Xi’an,Shaanxi 710018,China;Geological Research Institute,China National Logging Corporation,Xi’an,Shaanxi 710077,China;Research Institute of Petroleum Exploration and Development,Qinghai Oilfield Company,CNPC,Dunhuang,Gansu 736200,China;Changqing Branch,China National Logging Corporation,Xi’an,Shaanxi 710201,China;Well Logging Key Laboratory,China National Petroleum Corporation,Xi’an,Shaanxi 710077,China;Tuha Branch,China National Logging Corporation,Shanshan,Xinjiang 868202,China)

机构地区：[1]中国石油长庆油田公司气田开发事业部,陕西西安710018 [2]中国石油集团测井有限公司地质研究院,陕西西安710077 [3]中国石油青海油田公司勘探开发研究院,甘肃敦煌736200 [4]中国石油集团测井有限公司长庆分公司,陕西西安710201 [5]中国石油天然气集团有限公司测井重点实验室,陕西西安710077 [6]中国石油集团测井有限公司吐哈分公司,新疆鄯善868202

出　　处：《测井技术》2023年第6期753-757,共5页Well Logging Technology

基　　金：中国石油天然气集团有限公司重大专项课题“致密砂岩气藏提高采收率关键技术研究”(2023ZZ25)。

摘　　要：鄂尔多斯盆地伊陕斜坡本溪组气藏具有矿物类型多样、储层孔隙度低、渗透率低及非均质性强等特点,导致电阻率曲线受矿物含量变化及物性变化的影响较大,对储层含气性变化反应较弱,传统上利用电阻率测井资料评价流体性质的效果较差。在分析含气饱和度与纵波速度、横波速度及岩石力学参数之间规律的基础上,利用岩性扫描测井、阵列声波测井及常规补偿密度测井资料,计算100%含水地层体积模量和真实地层体积模量,通过分析二者的差异,形成了基于地层体积模量对比的储层含气性评价方法,识别储层流体性质。通过地层、骨架、水及天然气的体积模量建立了含水饱和度计算模型,依据试气层测井数据,建立含气性评价图版及含气饱和度图版,明确了伊陕斜坡本溪组气藏的气层、气水层、水层及干层的含气饱和度下限,实现了依据非电法测井资料定量求取储层含气饱和度的研究目标。研究成果在鄂尔多斯盆地伊陕斜坡本溪组气藏生产中的应用,有效提高了测井解释符合率,应用效果较好。相较于纵横波波速重叠包络法、泊松比与纵横波速比重叠包络法及弹性模量与真实地层体积模量重叠包络法等方法,地层体积模量对比法更能有效消除岩石骨架对评价流体性质的影响,解决了常规电法测井评价流体性质不准的难题,为重点井的试油选层及气藏含气规律研究提供技术支持。The gas reservoir of Benxi formation in Yishan slope of Ordos basin is characterized by various mineral types,low porosity,low permeability and strong heterogeneity.As a result,the resistivity curve is greatly affected by the changes of mineral content and physical properties,and the response to the change of reservoir gas content is weak.The traditional evaluation of fluid properties by resistivity logging data is poor.Based on the analysis of the law between gas saturation and compressional wave velocity,shear wave velocity and rock mechanics parameters,we use lithology scanning log,array sonic log and compensated conventional density log to calculate the formation volume modulus of 100% water content and the real volume modulus.Through the analysis of the difference between them,we form an evaluation method of gas-bearing reservoir based on the comparison of the formation volume modulus to evaluate reservoir fluid property.The water saturation model is constructed by the volume modulus of formation,skeleton,water and gas.Gas bearing evaluation chart and gas saturation chart are established according to the well logging data of gas layer,and the lower limit of gas saturation of gas layer,gas-water layer,water layer and dry layer of Benxi formation of Yishan slope is defined.The research goal of obtaining reservoir gas saturation based on non-electrical logging data is realized.Research results of this paper has been applied in the production of gas reservoir of Benxi formation of Yishan slope of Ordos basin,which improves the coincidence rate of well log interpretation.The application effect is good.Compared with the overlapping envelope method of P-wave and S-wave velocity,the overlapping envelope method of Poisson's ratio and P-wave and S-wave velocity ratio,and the overlapping envelope method of Elastic modulus and real formation volume modulus,the formation volume modulus correlation method can effectively eliminate the influence of rock framework on the evaluation of fluid properties,and solve the problem

关 键 词：测井评价 气藏 体积模量 流体识别 阵列声波 鄂尔多斯盆地 

分 类 号：P631.84[天文地球—地质矿产勘探]