F-K域多波变速波场分离

波场分离是多波多分量地震资料处理的基础工作,本文利用多波资料的动力学和运动学特征在Ｆ－Ｋ域实现多波炮集记录变速波场分离,可分解ｘ－ｚ分量中的Ｐ－Ｐ波和Ｐ－ＳＶ波,经过对理论模型和物理模型ｘ－ｚ二分量记录的试处理,获得了分解效果良好的Ｐ－Ｐ波和Ｐ－ＳＶ波记录     

苏里格气田苏48区盒_8—山_1段砂岩储层物性主控因素研究

通过岩心观察、物性分析、铸体薄片、扫描电镜、X-衍射等方法,对苏里格气田苏48区块盒8—山1段储层岩心样品进行分析测试,研究储层物性的主控因素。研究表明,苏里格气田苏48区盒8—山1段储层属低、特低孔低渗储层,其物性主要受沉积作用及成岩作用的控制。沉积作用通过控制储层的碎屑成分及沉积微相来控制其物性,心滩、边滩物性最好...     

Frequency‐space wavefield extrapolation using infinite impulse response digital filters: is it feasible?

The purpose of this paper is to study the possibility of performing practically stable and efficient frequency‐space (f?x) wavefield extrapolation for the application of seismic imaging and datuming via infinite impulse response (IIR) filters. The model reduction control theory was adopted to design such IIR f?x extrapolation filters. The model reduction theory reduces the order of a given order system which, in this case, involves reducing a finite impulse response (FIR) f?x extrapolation filter system into an IIR f?x extrapolation filter system. This theory relies on decomposing the states of the given filter system into strong and weakly coupled sub‐systems, and then eliminating the weakly coupled states via singular value decomposition of the Hankel and the impulse response Gramian matrices. Simulation results indicate that IIR f?x filters can be obtained, which are stable from an IIR filter design point of view. Simulations also indicate that stable seismic impulse responses and synthetics can be obtained with a reduced system model order and, hence, less computational efforts with respect to the number of complex multiplications and additions per output sample. It is hoped that this study will open new possibilities for researchers to reconsider designing IIR f?x explicit depth extrapolation filters due to their expected computational savings and wavenumber response accuracy, when compared to the FIR f?x explicit depth extrapolation filters.     

Garnet and spinel lherzolite assemblages in MgO–Al2O3–SiO2 and CaO–MgO–Al2O3–SiO2: thermodynamic models and an experimental conflict

The recent publication of an updated thermodynamic dataset for petrological calculations provides an opportunity to illustrate the relationship between experimental data and the dataset, in the context of a new set of activity–composition models for several key minerals. These models represent orthopyroxene, clinopyroxene and garnet in the system CaO–MgO–Al₂O₃–SiO₂ (CMAS), and are valid up to 50 kbar and at least 1800 °C; they are the first high‐temperature models for these phases to be developed for the Holland & Powell dataset. The models are calibrated with reference to phase‐relation data in the subsystems CaO–MgO–SiO₂ (CMS) and MgO–Al₂O₃–SiO₂ (MAS), and will themselves form the basis of models in larger systems, suitable for calculating phase equilibria in the crust and mantle. In the course of calibrating the models, it was necessary to consider the reaction orthopyroxene + clinopyroxene + spinel = garnet + forsterite in CMAS, representing a univariant transition between simple spinel and garnet lherzolite assemblages. The high‐temperature segment of this reaction has been much disputed. We offer a powerful thermodynamic argument relating this reaction to the equivalent reaction in MAS, that forces us to choose between good model fits to the data in MAS or to the more recent data in CMAS. We favour the fit to the MAS data, preserving conformity with a large body of experimental and thermodynamic data that are incorporated as constraints on the activity–composition modelling via the internally consistent thermodynamic dataset.     

KJ2х2.5х1.2-20矿井提升机提升系统安全技术改进

通过改进井口安全设施和安全装置,使KJ2х2.5х1.2-20提升机提升系统的安全技术得到较大的改进,并取得了良好的效果。运用机电一体化技术将其控制线路连接到安全保护回路中形成闭锁系统,最终达到提高提升系统安全水平,确保安全生产,提高经济效益的目的。     

Regular and Chaotic Solutions of the Sitnikov Problem near the 3/2 Commensurability

Regular solutions at the 3/2 commensurability are investigated forSitnikovx234364u/xxlarge8217.gif" alt="rsquo" align="BASELINE" BORDER="0">s problem. Utilizing a rotating coordinate system and theaveraging method, approximate analytical equations are obtained for thePoincare sections by means of Jacobian elliptic functions and 3x234364u/xxlarge960.gif" alt="pgr" align="BASELINE" BORDER="0">periodicsolutions are generated explicitly. It is revealed that the system exhibitsheteroclinic orbits to saddle points. It is also shown that chaotic regionemerging from the destroyed invariant tori, can easily be seen for certaineccentricities. The procedure of the current study provides reliable answersfor the long-time behavior of the system near resonances.     

波谱曲线指数化的方法和意义

地质研究对象的各种波谱曲线和数据包括显示量（由曲线的高低位置反映的总体辐射强度）和质（由曲线内部的起伏结构反映的不同波段辐射强度的内在相互关系）两方面的特征，其总体辐射强度往往因各种观测因素和条件的不同而发生变化，但其曲线结构形式一般不会因此而改变，本文一般性地介绍一种将复杂的原始波谱曲线简简单指数的思路和方法，使各种波谱曲线所反映的物体内在本质特征是以加强突出，同时尽量弱化总体辐射强度这一易变的     

天池天文峰剖面全新世火山喷发物长石的结构特征及意义

利用扫描电镜和x射线衍射分析数据研究天池火山天文峰剖面全新世喷发物中的长石表面特征和结构状态,结果显示:天文峰剖面从顶部黑色浮岩向下到暗灰色浮岩中,长石表面比较新鲜,个别长石有极轻微风化,在长石颗粒表面凹处偶有沉积厚度不同的非晶质絮状物。长石为碱性长石中的高透长石-高钠长石系列,特征衍射峰的强度、面网d值与歪长石PDF数据基本相符,物相组成为(Or37～41,Ab63～59),表明天池火山喷发物中的长石属歪长石;长石有序度介于0.045～0.089之间;η参数介于-1.010～-1.361之间;最低结晶温度为800～990℃,且顶部黑色浮岩中长石的最低结晶温度高达990℃。研究认为,有天池火山喷发的年代越新,长石有序度越低,其结构状态所记录的温度越高的趋势。目前测得的天池火山长石结构是由高温结构随温度下降转变而来,因此天池火山长石最初形成的温度可能更高。天池火山全新世喷发物中长石结构状态特征的差异可能与火山喷发的年代、喷发温度有关。研究天池火山全新世喷发物中的长石结构状态特征具有一定的理论和实际应用价值