非均质油气藏的测井技术发展方向
|
摘要
面对复杂的非均质油气藏 ,必须发展一套三维空间的储层评价技术来了解储层在纵、径向上和不同方位上储集性能的变化。首先以井为基础 ,研究井壁附近非均质油气藏储层的裂缝特征 ,用DSI测井研究速度各向异性 ,DSI所测快、慢横波的时差和能量差综合地反映了地层速度的各向异性。第二 ,裂缝的分布虽然千变万化 ,但它总要受到一定地质规律的控制 ,因此用测井资料对这些因素进行较准确的描述后 ,就可推测裂缝的横向展布 ,对现代构造应力的研究有助于对裂缝宏观展布状况的预测。第三 ,为了提高油气勘探的效率 ,要求尽量准确地搞清非均质油气藏的形态、厚度、物性、地层流体等性质在横向上的变化 ,从单井测井资料分析显然是不够的 ,因此测井必须与地质、垂直地震测井、地面地震结合起来才有可能解决这一问题。在四川这种严重非均质的油气藏 ,要搞好储层识别和评价工作 ,测井资料除采集三电阻率、三孔隙度之外 ,还应采集电阻率成像和包含有横波、斯通利波信息的声波资料 ,这样才能保证更准确、全面地描述非均质油气藏的各项特征 ,这也是四川测井技术发展的方向。
In face of the complicated heterogeneous oil and gas reservoirs,it is necessary to expand a set of 3-D reservoir evaluation techniques to find out the reservoir property change in vertical,lateral and radial.First,by taking individual well as the basis,the characteristics of fractures in the heterogeneous oil and gas reservoir near borehole wall are studied and the velocity anisotropism can be researched by the DSI logging method,because the interval transit time and energy difference between the fast and slow shear-waves logged by DSI may comprehensively reflect the formation velocity anisotropism;second,although the distribution of fractures is complex and changeable,it must be controlled by a certain geological law after all,therefore the lateral distribution of fractures may be predicted by accurately describing these factors with log data and the investigation of current tectonic stress field is conductive to the prediction of the macro-distribution of fractures;and third,in order to raise the success ratio of oil and gas exploration,the lateral change laws of the shapes,thicknesses,petrophysical properties and formation fluid properties,etc.,of the heterogeneous oil and gas reservoirs must be accurately found out as far as possible,so that the analysis of the individual well log data is not enough;such a problem may be settled only through combining the log data with the data on geology,vertical seismic log and surface seismic exploration.In order to identify and evaluate the super heterogeneous oil and gas reservoirs found in Sichuan Basin finely,the resistivity imaging log data and acoustic logging data including the shear-wave and Stoneley wave in formation should be acquired besides the three-resistivity log and three-porosity log data.Only based on this can various characteristics of the heterogeneous oil and gas reservoirs be described overall and accurately.And this is also the trend of expanding logging techniques in Sichuan.
In face of the complicated heterogeneous oil and gas reservoirs,it is necessary to expand a set of 3-D reservoir evaluation techniques to find out the reservoir property change in vertical,lateral and radial.First,by taking individual well as the basis,the characteristics of fractures in the heterogeneous oil and gas reservoir near borehole wall are studied and the velocity anisotropism can be researched by the DSI logging method,because the interval transit time and energy difference between the fast and slow shear-waves logged by DSI may comprehensively reflect the formation velocity anisotropism;second,although the distribution of fractures is complex and changeable,it must be controlled by a certain geological law after all,therefore the lateral distribution of fractures may be predicted by accurately describing these factors with log data and the investigation of current tectonic stress field is conductive to the prediction of the macro-distribution of fractures;and third,in order to raise the success ratio of oil and gas exploration,the lateral change laws of the shapes,thicknesses,petrophysical properties and formation fluid properties,etc.,of the heterogeneous oil and gas reservoirs must be accurately found out as far as possible,so that the analysis of the individual well log data is not enough;such a problem may be settled only through combining the log data with the data on geology,vertical seismic log and surface seismic exploration.In order to identify and evaluate the super heterogeneous oil and gas reservoirs found in Sichuan Basin finely,the resistivity imaging log data and acoustic logging data including the shear-wave and Stoneley wave in formation should be acquired besides the three-resistivity log and three-porosity log data.Only based on this can various characteristics of the heterogeneous oil and gas reservoirs be described overall and accurately.And this is also the trend of expanding logging techniques in Sichuan.
引文
1 赵良孝主编.碳酸盐岩储层测井评价技术.北京:石油工业出版社,1994年
2 欧阳健等著.测井地质分析与油气定量评价.北京:石油工业出版社,1999年
2 欧阳健等著.测井地质分析与油气定量评价.北京:石油工业出版社,1999年
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心