应用遥感技术划分芜铜地区地层

采用遥感技术及其图象资料，对地层影象进行系统解译、调绘验证，达到划分对比地层的目的，是一种新的技术途径和方法。本文重点介绍芜钢地区１／１．４万航片、１／２０万ＴＭ卫片数字图象处理的地层影象解译调绘的成果、经验和方法。     

反演地壳磁化强度等效源法的模型验证及实际资料试算

等效源法曾被广泛应用于卫星磁异常解释,而本文是将等效源法引用到航空△T磁场的解释中,用其研究区域地质构造。根据等效源法的理论,推导出球坐标系下球棱柱体的△T磁场公式,采用线性反演的方法进行模型验证,同时将该方法用于秦巴地区航空△T磁异常的试算,得到了一些有意义的结论。利用该方法可由所求得的磁场强度来得到居里深度分布。     

树分类器在测井岩性评价中的应用

 利用测井资料进行岩性定量识别,分类方法的设计是决定分类结果好坏的关键。本文讨论了树分类器与产生式规则相结合的方法在岩性分类中的应用。利用数据完整的测井曲线参与树分类器的学习、判别工作,用树分类器进行岩性的“逐级识别”,不完整的特征交由定性规则处理,既实现了岩性的细分,且保证了分类的精度。     

利用测井资料研究储层的孔隙结构

以岩芯孔隙结构分析为基础，通过分析表征孔隙结构参数的静态模型， 依据现场数据得到了求解孔隙结构参数的白化方程，从而阐明了用测井资料 求解孔隙结构参数的可行性。通过2个实例的分析表明，可以用声波时差、感 应电导、自然电位等常规测井方法准确地求取孔喉半径、喉道分选系数等孔 隙结构参数。为储层微观非均质性研究打下了基础以及为储层评价提供了有 用的手段，直接指导了油田生产及调整开发措施的实施。     

RESEARCH ON TIME-DISTANCE INTERPRETATION OF MULTIPLES AND GHOSTS BASED ON MARINE SEISMIC DATA

Currently, the study on the active fault in the land areas is relatively mature, while there is still lack of detection and research on active faults in the sea areas. Marine exploration, which is different from land areas, has a prominent problem due to the existence of strong reflecting interfaces such as water surface and seafloor in the sea, thus the recording is often accompanied by interference of multiples on seafloor reflections. In addition, because of the characteristics of marine seismic exploration, the source exciting in the water and the geophone receiving in the water, ghost wave usually can be recorded simultaneously during the reflected wave propagation. This phenomenon makes it difficult to distinguish the effective waves and the noise, and has always plagued the data and seriously affects the quality of records. In the offshore and other regions of complex structures, such as inclined interfaces, it is difficult to eliminate the interference of multiples accurately by traditional multiples suppression methods, which are based on the horizontal interface assumption. This paper combines the sea area seismic data and its acquisition method, uses simplified model to simulate the multiples based on the time-distance analysis of multiples and their ghost wave in inclined interface. The time-distance characteristics of the multiples and their ghost waves from different interfaces(including the inclined interface)are obtained, and they are consistent with the actual records. The multiples time-distance simulation can help to distinguish the causes of reflected waves, summarize the multiple-wave time-distance characteristics from different interfaces(including inclined interfaces), and analyze the relationship between the characteristics of multiple waves and primary waves. In particular, this simulation has a significant effect on characterizing the internal multiples that are difficult to identify due to inconspicuous periodicity and the multiples of the inclined interface which present the phenomenon that the vertex of the time-distance curve is shifted. On this basis, relying on the time-distance analysis of ghost wave, we analyze the travel time difference characteristics between reflected waves and their accompanying ghost waves. The differences of the travel time characteristics of different orders ghost wave and reflected wave are summarized and the symmetry of the travel time difference between inclined interface and horizontal interface of ghost waves and reflected waves is analyzed. We simulate the distraction of the ghost wave event with the event of the reflected wave and analyze the influence of the ghost wave on the sea area seismic records. These results can improve the practical interpretation of seismic data. At last, the time-distance information is used to synthesize sea area seismic records, which can help us carry out the effective data processing and understand the characteristics of the time-distance and velocity of multiples in different interfaces and the layer artifact caused by multiples. This study combines the time-distance simulation of multiples and their ghost wave with conventional seismic data processing to analyze the pre-stack and post-stack features of multiple waves and their ghost waves in the seismic records of the sea area. The results of this study are conducive to the effective identification of multiples in seismic records in the sea, provide a theoretical basis for multi-wave suppression and prediction, and may facilitate the future study of sea-area seismic activity detection.     

A direct method for interpreting magnetic anomalies—the case of a horizontal circular cylinder

A new method is introduced here to interpret the magnetic anomalies with special reference to vertical magnetic anomalies of a horizontal circular cylinder. The parameters of the cylinder are found to be related toV, ∂V/∂x and∂V/∂z at the origin of the cylinder. HereV is the observed anomaly,∂V/∂x and∂V/∂z are its horizontal and vertical derivatives respectively. The origin may be located working out an equality,viz.,3(∂V/∂z) ²=2V∂²V/∂z² which is true only at the origin. Thus, once the cylinder is located,V, ∂V/∂x and∂V/∂z at its origin can be determined and hence its parameters. The procedure is illustrated with a theoretical example.     

起伏地形剖面重磁异常半智能处理解释软件及应用

简要介绍了起伏地形剖面重磁异常半智能处理解释软件的基本原理和方法技术,及其系统实现方法和主要功能,并对云南某地的实测航磁剖面进行了最优化正反演计算。     

关于得尔布干深大断裂北东段延伸去向问题的遥感分析

在1:100万遥感地质解译编图的基础上,经进一步综合解译发现得尔布干深大断裂北东段有可能在阿龙山镇附近演变形成延伸方向和性质均不同的两条分支大断裂.一条呈北东向延伸进入俄罗斯;另一条呈北东东-北东向延伸出境,并以锐角相交形式在阿龙山镇附近与得尔布干深大断裂中南段衔接,构成一醒目斜"Y"型断裂构造展布格局.     

2002年12月广西寒潮过程特征及数值预报产品的释用

对2002年12月25～27日全区性寒潮天气过程爆发前后的形势进行分析,认为横槽南摆是造成这次过程的主要原因,而低纬度南支槽的配合加剧了过程的降温、降水;通过对数值预报产品的解释应用,得到一些预报全区性寒潮的指示信息。     

面块切片在三维地震资料解释中的应用

目前的三维地震资料解释方法仍停留在二维解释的基础上。面块切片解释改变了传统的解释方法，利用了更多的三维信息，比较充分地发挥了三维数据体的三维立体优势，使解释过程更直观、更清楚，提高了解释精度和速度。