The gas-bearing reservoir in X area is mainly the tight sandstone reservoir characterized by low porosity and permeability, frequently lateral variation and poor connectivity of single sand. The previous research resu...The gas-bearing reservoir in X area is mainly the tight sandstone reservoir characterized by low porosity and permeability, frequently lateral variation and poor connectivity of single sand. The previous research results reveal that the general seismic attributes analysis cannot meet the requirement of fluid identification. This is because the relationship between seismic attributes and their implication is uncertain and ambiguous, which decreases the precision of both reservoir prediction and fluid identification. To overcome the problem, multi-attribute crossplot technology is proposed from the mathematical statistical point of view rather than the correspondence between the seismic attributes and their geological implication. In this method, the wells which have the same statistical law are classified firstly, and then all the interest wells are retained while the wells beyond the statistical law are eliminated, and the seismic attributes sensitive to the same types of eliminated wells are optimized and used to generate crossplots. The nonzero area of their crossplots results just predicts the potential distribution. The discontinuity of subsurface geological conditions results in the non-continuous shape and the seismic bin lead to the mosaic form. The optimization of sensitive attributes relative to the same types of wells is independent from each other, and thus the order of attributes in crossplots does not affect the final prediction results. This method is based on the statistical theory and suitable for the areas such as the study area abundant of lots of well data. Application to X area proves the effectiveness of this method and predicts plane distribution about different types of gas production. Due to the effect of faults and other geological factors, the partition prediction results using multi-attribute crossplots reach 95% of coincidence which is obviously and far higher than the results of the whole area. The final prediction results show that the potential areas with medium and high gas production are mainly concentrated in the northern part of the study area, where lots of development research will be strengthened.展开更多
针对单一的非线性电阻元件无法模拟金属氧化物压敏电阻片的伏安特性,对IEEE模型与P-G模型进行了对比介绍,并利用ATP-EMTP仿真软件对二者使用波形为8/20μs,幅值分别为5 k A,10 k A,20 k A的雷电流进行仿真冲击。最后将仿真得到的残压与...针对单一的非线性电阻元件无法模拟金属氧化物压敏电阻片的伏安特性,对IEEE模型与P-G模型进行了对比介绍,并利用ATP-EMTP仿真软件对二者使用波形为8/20μs,幅值分别为5 k A,10 k A,20 k A的雷电流进行仿真冲击。最后将仿真得到的残压与实验数据对比。结果显示模型皆有较好的仿真结果,最大的不同就是模型中对参数值估算的复杂度不一样,P-G模型较为简单,仿真结果更精确,电路的组成更简单,实用性更强。展开更多
文摘The gas-bearing reservoir in X area is mainly the tight sandstone reservoir characterized by low porosity and permeability, frequently lateral variation and poor connectivity of single sand. The previous research results reveal that the general seismic attributes analysis cannot meet the requirement of fluid identification. This is because the relationship between seismic attributes and their implication is uncertain and ambiguous, which decreases the precision of both reservoir prediction and fluid identification. To overcome the problem, multi-attribute crossplot technology is proposed from the mathematical statistical point of view rather than the correspondence between the seismic attributes and their geological implication. In this method, the wells which have the same statistical law are classified firstly, and then all the interest wells are retained while the wells beyond the statistical law are eliminated, and the seismic attributes sensitive to the same types of eliminated wells are optimized and used to generate crossplots. The nonzero area of their crossplots results just predicts the potential distribution. The discontinuity of subsurface geological conditions results in the non-continuous shape and the seismic bin lead to the mosaic form. The optimization of sensitive attributes relative to the same types of wells is independent from each other, and thus the order of attributes in crossplots does not affect the final prediction results. This method is based on the statistical theory and suitable for the areas such as the study area abundant of lots of well data. Application to X area proves the effectiveness of this method and predicts plane distribution about different types of gas production. Due to the effect of faults and other geological factors, the partition prediction results using multi-attribute crossplots reach 95% of coincidence which is obviously and far higher than the results of the whole area. The final prediction results show that the potential areas with medium and high gas production are mainly concentrated in the northern part of the study area, where lots of development research will be strengthened.
文摘针对单一的非线性电阻元件无法模拟金属氧化物压敏电阻片的伏安特性,对IEEE模型与P-G模型进行了对比介绍,并利用ATP-EMTP仿真软件对二者使用波形为8/20μs,幅值分别为5 k A,10 k A,20 k A的雷电流进行仿真冲击。最后将仿真得到的残压与实验数据对比。结果显示模型皆有较好的仿真结果,最大的不同就是模型中对参数值估算的复杂度不一样,P-G模型较为简单,仿真结果更精确,电路的组成更简单,实用性更强。
