低渗低阻产水气藏气水层识别:以广安气田须家河组为例  

Gas and Water Pay Recognition of Water-Producing Reservoir with Low Permeability and Resistivity:A Case from the Xujiahe Formation in Guang'an Gasfield of Sichuan Basin,Southwestern China

作　　者：兰朝利 张君峰[2] 何顺利 张红玲 杨明慧 王金秀 

机构地区：[1]中国石油大学石油工程学院石油工程教育部重点实验室,北京102249 [2]中国石油天然气股份有限公司勘探与生产分公司,北京100001 [3]中国石油大学地球科学学院油气资源与探测国家重点实验室,北京102249

出　　处：《地球科学（中国地质大学学报）》2010年第6期1053-1059,共7页Earth Science-Journal of China University of Geosciences

基　　金：国家科技重大专项(No.2008ZX05009);'973'重点基础研究规划项目(No.2003CB214602);中国石油天然气集团公司石油科技中青年创新基金项目(No.04E7023)

摘　　要：广安气田上三叠统须四段和须六段气藏发育了构造气藏、构造-岩性气藏和岩性气藏.储层具有低孔、低渗、低阻和高束缚水饱和度特征.空间上,储层孔渗相关关系变化大,气水分布复杂,气水层识别困难.根据岩心对测井的标定,研究了须四段和须六段四性关系,认识到储层为细砂岩、中砂岩和粗砂岩,具有低自然伽马、低补偿密度、低电阻率和高声波时差特征,而物性与含气性无明显相关性.采取了分层、分区块建立储层孔隙度、渗透率模型,提高了物性解释精度.不同气藏类型具有不同的气水分布,应用阵列感应、核磁共振和综合判识3种方法进行了气水层识别,提高了广安气田气水层识别精度.这些方法在广安气田的应用表明可以准确识别构造气藏和构造-岩性气藏的气、水层,但对构造幅度低的岩性气藏识别精度不高,因为在这些岩性气藏中气水分异不彻底,气层与气水同层、水层含水饱和度是渐变的.The fourth and sixth members of upper Triassic Xujiahe Formation develop structural,structural-lithological and lithological reservoirs with characteristics of low porosity,permeability,resistivity and high irreducible water saturation in Guang’an gasfield of Sichuan basin,southwestern China.In space,relationship of the reservoir porosity and permeability varies greatly,and the reservoir gas and water distribution is complex,resulting in difficulty in gas and water pay recognition.Based on the core calibration of logging data,relationships among lithology,logging characterization,petrophysical property and gas-bearing capacity of the target zones were explored.It can be concluded that the reservoirs are made up of fine,medium-and coarse-grained sandstones with characteristics of low values of gamma ray,density and resistivity and high values of sonic,while the porosity and permeability show no correlation with gas-bearing capacity.The porosity and permeability model were established by considering the sixth and fourth members of Xujiahe Formation separately and subdividing the study area into four blocks,which improves precision of the porosity and permeability interpretation.On the recognition that different gas reservoir types have different gas and water distributions,three methods of high definition induction logging,nuclear-magnetic resonance logging and comprehensive discrimination were jointly applied to distinguish gas and water pays,which increases the accuracy of gas and water pay identification.The application of these methods in the Guang’an gasfield show they are suitable for gas and water pay recognition of structural and structural-lithological reservoirs,whereas not feasible for lithological reservoirs with low structural magnitude whose water saturations of gas pay are transitional with those of water and gas-and water-bearing pay due to incomplete separation of gas and water.

关 键 词：测井解释 气水层识别 产水气藏 石油地质 广安气田 

分 类 号：P618.13[天文地球—矿床学]