摘要
目前的测井方法多达数十种 ,它们都有自身的探测特性和适用范围 ,每种测井信息都是地层某一种物理性质或物理参数的反映 ,都只是从某一侧面间接地反映地层的地质特性 ;同时 ,井下地层的地质情况又很复杂 ,加上测井仪器在采集资料时不可避免地要受到井下多种环境因素的影响。因此 ,测井信息的间接性引起了测井解释在认识上的模糊性和多解性 ,解决的办法是将测井与钻井、录井等地质资料综合起来 ,尽量作出符合实际的地质解释。地质录井资料是识别油气层最直观、最重要的第一性资料 ,是储集层含油气最直接的标志 ,也是测井解释判别储层流体性质的重要依据之一。然而 ,在现场测井解释中经常发现 ,有些储集层在钻井过程中无直接油气显示 ,录井资料显示也不好 ,而测井曲线却反映有油气 ,后经试油获得了工业性油气流 ;同样 ,有些储集层测井曲线响应较差 ,而钻井和录井又有油气显示 ,后经试油也获得了工业性油气流。文章列举了这方面的实例 ,分析了造成这种现象的原因并提出了相应的解决办法 ,以便能及时准确地发现油气层。
At present,the logging methods are as many as few tens of kinds,each having its detecting properties and applicable scope.Each kind of log messages is the reflection of one petrophysical property or parameter,which only reflects the geological features of the formation indirectly from one aspect.Owing to the complexity of downhole geological conditions and the unavoidable influence of many downhole environmental factors when the data were acquired by use of logging instruments,the fuzzyness and multi-solvability occurred to the log interpretation so that it is necessary to combine well logs with geological log data to make a reasonable geological interpretation as fully as possible.The geological log data are the most visual and important firsthand data of identifying hydrocarbon reservoirs,the most direct mark of hydrocarbon-bearing formations and the one of the important bases of identifying reservoir fluid nature by log data.However,it was often found in on-site log interpretation that in some reservoirs,there were no direct hydrocarbon shows in the process of drilling,the hydrocarbon shows of the geological log data were bad but the logs indicated the occurrence of hydrocarbons,and then the commercial oil and gas flowing was obtained through well testing;on the contrary,in other reservoirs,the log response was bad but the drilling and geological log data indicated the occurrence of hydrocarbons,and then the commercial oil and gas flowing was also obtained through well testing.In the paper,some cases about this aspect are listed,the reasons of causing such a phenomenon are analyzed and the relevant solvent ways are proposed,so as to be able to exactly find out the hydrocarbon reservoirs in time.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2003年第z1期52-56,共5页
Natural Gas Industry
关键词
测井
录井
地质解释
油气层
判断
Well logging, Logging, Geologic interpretation, Oil and gas formation, Decision
