Tracing of natural gas migration by light hydrocarbons:A case study of the Dongsheng gas field in the Ordos Basin,NW China

Based on the analysis of light hydrocarbon compositions of natural gas and regional comparison in combination with the chemical components and carbon isotopic compositions of methane,the indication of geochemical characteristics of light hydrocarbons on the migration features,dissolution and escape of natural gas from the Dongsheng gas field in the Ordos Basin is revealed,and the effect of migration on specific light hydrocarbon indexes is further discussed.The study indicates that,natural gas from the Lower Shihezi Formation(Pix)in the Dongsheng gas field displays higher iso-C5-7contents than n-C5-7contents,and the C6-7light hydrocarbons are composed of paraffins with extremely low aromatic contents(<0.4%),whereas the C7light hydrocarbons are dominated by methylcyclohexane,suggesting the characteristics of coal-derived gas with the influence by secondary alterations such as dissolution.The natural gas from the Dongsheng gas field has experienced free-phase migration from south to north and different degrees of dissolution after charging,and the gas in the Shiguhao area to the north of the Borjianghaizi fault has experienced apparent diffusion loss after accumulation.Long-distance migration in free phase results in the decrease of the relative contents of the methylcyclohexane in C7 light hydrocarbons and the toluene/n-heptane ratio,as well as the increase of the n-heptane/methylcyclohexane ratio and heptane values.The dissolution causes the increase of isoheptane values of the light hydrocarbons,whereas the diffusion loss of natural gas in the Shiguhao area results in the increase of n-C5-7contents compared to the iso-C5-7contents.

On Diagonal P-Representation of Superposition Field of Two Light Modes

For the superposition field a^＋1＋aA^＋2 of two light modes we introduce an appropriate diagonal P-representation which is constructed on the common eigenvectors ｜z,x 〉 of （X1 -X2） and al ＋ a2, where Xi = （ai ＋ a^＋i） /√2, [ai, a^＋i] = δij. It is remarkable that ｜z, x〉make up a new quantum mechanical representation.

Teleportation of Entangled States through Divorce of Entangled Pair Mediated by a Weak Coherent Field in a High-Q Cavity

We propose a scheme to partially teleport an unknown entangled atomic state. A high-Q cavity, supporting one mode of a weak coherent state, is needed to accomplish this process. By partial teleportation we mean that teleportation will occur by changing one of the partners of the entangled state to be teleported. The entangled state to be teleported is composed by one pair of particles, we called this surprising characteristic of maintaining the entanglement, even when one of the particle of the entangled pair being teleported is changed, of divorce of entangled states.

Entropy of field interacting with two two-qubit atoms

We use quantum field entropy to measure the degree of entanglement for a coherent state light field interacting with two atoms that are initially in an arbitrary two-qubit state. The influence of different mean photon number of the coherent field on the entropy of the field is discussed in detail when the two atoms are initially in one superposition state of the Bell states. The results show that the mean photon number of the light field can regulate the quantum entanglement between the atoms and light field.

鄂尔多斯盆地大牛地气田上古生界致密气轻烃地球化学特征

大牛地气田是鄂尔多斯盆地典型致密砂岩大气田之一。为了更深入了解该区天然气的成因和来源,揭示天然气运移相态,对大牛地气田上古生界致密气开展了轻烃地球化学特征分析。研究表明,该区上古生界致密气C5-7轻烃组成具有异构烷烃优势分布,C6-7轻烃组成中芳烃含量整体偏低(<10%),甚至未检出芳烃,C7轻烃组成具有甲基环己烷优势分布特征,甲基环己烷相对含量均超过50%。上二叠统下石盒子组天然气K_(1)值、K_(2)值均与二叠系山西组和石炭系太原组天然气一致,而δ^(13)C_(1)值则与山西组天然气一致,与太原组天然气有明显不同。与山西组天然气相比,下石盒子组天然气整体具有偏低的苯/正己烷、苯/环己烷和甲苯/正庚烷比值,以及明显偏高的正庚烷/甲基环己烷比值。轻烃地球化学特征及烷烃气碳氢同位素组成综合表明,大牛地气田上古生界天然气为典型煤成气,其中山西组和太原组天然气均为原地自生自储,而下石盒子组天然气为下伏山西组烃源岩生成的天然气经历了游离相垂向运移聚集形成,太原组烃源岩不具有显著贡献。受天然气运移和水溶等作用影响,庚烷值、异庚烷值、苯/正己烷比值等轻烃指标直接用于判识大牛地气田致密气成熟度会存在偏差。

天然气运移轻烃地球化学示踪--以鄂尔多斯盆地东胜气田为例

基于天然气中轻烃化合物组成分析和区域性对比,结合组分和甲烷碳同位素组成特征,揭示轻烃地球化学特征对鄂尔多斯盆地东胜气田上古生界天然气运移和水溶及逸散等示踪作用,探讨运移作用对特定轻烃指标的关联效应。研究表明:①东胜气田二叠系下石盒子组天然气C5−7异构烷烃含量高于正构烷烃,C6−7轻烃组成呈链烷烃优势分布且芳香烃含量明显偏低(小于4.0%),C7轻烃主体呈甲基环己烷优势分布,整体表现出煤成气特征且受到了水溶等作用影响;②东胜气田天然气经历了自南向北的游离相运移,并在充注后发生不同程度的水溶作用,其中泊尔江海子断裂以北什股壕地区天然气在聚集后具有明显的散失;③长距离的游离相运移导致天然气C7轻烃中甲基环己烷相对含量和甲苯/正庚烷值降低、正庚烷/甲基环己烷值和庚烷值增大,水溶作用导致轻烃异庚烷值增大,天然气散失导致什股壕地区天然气中C5−7正构烷烃相对异构烷烃含量增加。

Optical bound states in the continuum in periodic structures:mechanisms,effects,and applications

Optical bound states in the continuum(BICs)have recently stimulated a research boom,accompanied by demonstrations of abundant exotic phenomena and applications.With ultrahigh quality(Q)factors,optical BICs have powerful abilities to trap light in optical structures from the continuum of propagation waves in free space.Besides the high Q factors enabled by the confined properties,many hidden topological characteristics were discovered in optical BICs.Especially in periodic structures with well-defined wave vectors,optical BICs were discovered to carry topological charges in momentum space,underlying many unique physical properties.Both high Q factors and topological vortex configurations in momentum space enabled by BICs bring new degrees of freedom to modulate light.BICs have enabled many novel discoveries in light-matter interactions and spin-orbit interactions of light,and BIC applications in lasing and sensing have also been well explored with many advantages.In this paper,we review recent developments of optical BICs in periodic structures,including the physical mechanisms of BICs,explored effects enabled by BICs,and applications of BICs.In the outlook part,we provide a perspective on future developments for BICs.

红外发光二极管对固体继电器漏电流的影响

固体继电器在军工和民用市场被使用得越来越广泛,大量替换了传统的电磁继电器,并且固体继电器的隔离方式也从变压器隔离向着光隔离转变,光隔离固体继电器已经成为很多厂家的设计主流。光隔离固体继电器被大量使用,但是在使用红外发光二极管等发光器件时,如果选择的红外发光二极管的波长和输出场效应管的禁带宽度不匹配,处理不当时会造成固体继电器的输出漏电流超标。通过光电效应分析了红外发光二极管对固体继电器输出漏电流的影响,通过试验测试验证了这种影响机理,并提出了改进方法。

Controlling Population Transfer and Dissociation Rate of Na2 Molecules with Ultra-Short Intense Laser Pulses

A scheme used for controlling the population transfer and the dissociation rate of Na2 molecules is described by using the quantum wavepacket dynamical method. It is theoretically shown that the population transfer and the dissociation rate of Na2 molecules can be controlled by pump and probe laser pulses with appropriate widths of pulses, sequence and intensities.

GENERATION OF NONCLASSICAL STATES OF LIGHT FIELD BY ORTHO-SYMMETRIZATION

In recent years, nonclassical effects of light field havealways been a very conspicuous subject. In this field an effective approach is to construct as many as possible the nonclassical states of light field that are allowed in the frame of quantum mechanics and then to study their properties, so as to find out the relations of different nonclassical effects or states of light field and to discover new nonclassical effects or states of light field.

轻烃地球化学特征对天然气来源和运移相态的约束——以四川盆地西部新场气田侏罗系气藏为例

新场气田侏罗系是四川盆地川西坳陷天然气稳产的重要产层之一,但是新场气田侏罗系天然气来源和成藏特征的认识存在较大争议。为了更有效地揭示川西坳陷侏罗系天然气成藏过程和富集机理,在分析新场气田不同层位天然气轻烃化合物组成的基础上,探讨了轻烃参数判识成熟度的适用性,并揭示了轻烃地球化学特征对成烃成藏的指示意义。研究结果表明:(1)新场气田侏罗系天然气C_(5)—C_(7)轻烃组成中异构烷烃相对正构烷烃呈优势分布,C_(7)轻烃组成中甲基环己烷呈明显的优势分布,甲基环己烷指数均大于60%,为典型的煤成气;C_(6)—C_(7)轻烃组成中芳烃含量明显低于链烷烃和环烷烃。(2)上侏罗统蓬莱镇组气藏主要为上三叠统须家河组三段烃源岩生成的天然气以游离相运移聚集形成,中侏罗统沙溪庙组气藏与部分蓬莱镇组气藏主要为须家河组五段烃源岩生成的天然气以水溶相和游离相运移聚集形成。(3)蓬莱镇组气藏天然气C_(6)—C_(7)轻烃组成中芳烃含量明显偏低,异庚烷值明显偏高,主要源自不同类型化合物在溶解度、极性等方面的差异影响。结论认为,天然气在运移聚集过程中受水溶、吸附等作用的影响,运用C_(6)—C_(7)轻烃组成、异庚烷值分别进行天然气成因类型和成熟度判识时需特别谨慎。

第Ⅶ类两态叠加多模叠加态光场的偶数阶等阶N次方Y压缩

本文构造了由多模相干态 |{Zj}〉q与多模虚相干态的相反态 |{-i Zj}〉q这两者的线性叠加所组成的第 类两态叠加多模叠加态光场 |ψ(2 )7〉q.利用多模压缩态理论 ,研究了态|ψ(2 )7〉q 的偶数阶等阶 N次方 Y压缩特性 .结果发现 :在压缩阶数 N =2 p、并且 P=2 m+1( m=0 ,1 ,2 ,3 ,… ,… )的条件下 ,如果各模的初始相位 φj( j=1 ,2 ,3 ,… ,q)、态间的初始相位差与各单模相干态光场的平均光子数之和 [( θ(R)pq -θ(I)nq) + qj =1R2j]等分别满足一定的取值条件 ,则在这种情况下态 |ψ(2 )7〉q可呈现出周期性变化的偶数阶等阶 N次方 Y压缩效应 .

第Ⅰ种非对称两态叠加多模叠加态光场的偶数阶等阶N次方Y压缩

本文利用多模压缩态理论 ,研究了第 种非对称两态叠加多模叠加态光场 |Ψ(ab) 〉q的偶数阶等阶 N次方 Y压缩特性 .结果发现 :在压缩阶数 N取偶数情况下 ,只要构成态 |Ψ(ab) 〉q的两个量子光场态的强度 (即平均光子数 )不相等 ,则当各模的初始相位φ(a)j 、φ(b)j ( j=1 ,2 ,3 ,… ,q)、态间的初始相位差 ( θ(b I)pq -θ(a R)nq )以及与上述的两个量子光场态相对应的各单模相干态光场的光子干涉项之和 qj =1[R(a)j R(b)j cos( φ(a)j -φ(b)j ) ]等满足一定条件时 ,态 |Ψ(ab) 〉q 可呈现出周期性变化的、任意偶数阶的等阶 N次方 Y压缩效应 .

量子叠加态光场中广义电场的N次方H压缩效应

利用多模压缩态理论 ,研究了一种新型的三态叠加多模量子叠加态光场 ｜Ψ( 3 ) 〉q 中广义电场分量的等幂次N次方H压缩特性。结果发现 ,在一定条件下 ,态 ｜Ψ( 3 ) 〉q 的广义电场分量总可呈现出周期性变化的广义非线性等幂次 N次方H压缩效应。

一种强度不对称的两态叠加多模叠加态光场的等阶N次方H压缩特性研究

利用多模压缩态理论 ,研究了一种强度不对称的两态叠加多模叠加态光场 ｜Ψ(ab)I >q 的等阶N次方H压缩特性。结果发现 :当腔模总数 q与压缩阶数 N 这两者之积 qN 为偶数时 ,态 ｜Ψ(ab)I >q 的第一或第二正交分量在一定条件下可分别呈现出等阶N次方H压缩效应。

第类多模叠加态光场的不等幂次差压缩特性

利用多模不等幂次压缩态的一般理论,详细研究了第 类两态叠加多模叠加态光场的场幅幂次不等的差压缩特性(即Nj次方X压缩特性),结果发现:第 类多模叠加态在一定的条件下存在周期性变化的广义非线性二阶不等幂次Nj次方X压缩效应;发现了"奇异压缩"现象;说明这个多模叠加态光场是一种典型的多模非经典光场。

第Ⅰ类三态叠加多模叠加态光场高次和压缩特性

构造了由多模相干态|{Zj}〉q、多模真空态|{0j}〉q和多模相干态的相反态|{-Zj}〉q线性叠加组成的第Ⅰ类三态叠加多模叠加态光场|ψ(3)1〉q,利用多模压缩态理论,研究了态|ψ(3)1〉q中广义电场分量的等幂次高次和压缩特性.结果表明,在一定条件下,态|ψ(3)1〉q的广义电场分量(即第二正交相位分量)可分别呈现出周期性变化的等幂次奇数模与偶数次、偶数模与奇数次、偶数模与偶数次、奇数模与奇数次的高次和压缩效应.

态|Ψ^((3))〉_q中广义电场分量的不等幂次N_j次方Y压缩

利用多模压缩态理论 ,研究了由多模复共轭虚相干态 |{iZ j}〉q、多模复共轭虚相干态的相反态 |{ -iZ j}〉q 和多模复共轭相干态 |{Z j}〉q 的线性叠加所组成的新型三态叠加多模叠加态光场 |Ψ( 3 ) 〉q 中广义电场分量的偶数次不等幂次Nj 次方Y压缩特性 .结果发现 :在各模的压缩次数Nj=2 pj 且 pj=2m′j+1(m′j=0 ,1,2 ,3,… ,… )和Nj′=2 pj′且 pj′=2m′j′+1(m′j′=0 ,1,2 ,3,… ,… )的条件下 ,当各模的初始相位 φj 与 φj′、态间的初始相位差 (θ1-θ3 )与 (θ2 -θ3 ) ,以及各单模相干态光场总的平均光子数之和 qj=1R2 j 等分别满足一定的取值条件时 ,态 |Ψ( 3 ) 〉q 的广义电场分量(即第二正交相位分量 )总可呈现出周期性变化的、偶数次的广义非线性不等幂次Nj

受量子相位调制的两态叠加多模叠加态光场的广义非线性等阶N次方Y压缩

本文根据量子力学中的线性叠加原理 ,构造了由受量子相位调制的多模 (即 q模 )虚相干态 |{im1 Zj}〉q及其相反态 |{- im2 Zj}〉q这两者的线性叠加所组成的一种新型的两态叠加多模叠加态光场 |ψ( 2 )m1 ,m2 〉q.利用新近建立的多模压缩态理论 ,详细研究了态 |ψ( 2 )m1 ,m2 〉q的广义非线性等阶 N次方 Y压缩特性 .结果发现 :1 )无论态间的初始相位差 (θm2 - θm1 )、各模的初始相位 φj、腔模总数 q、压缩参量 Rj以及两态叠加的几率幅 rm1 和 rm2 等取何值 ,无论压缩阶数N取奇还是取偶 ,只要相位调制因子 m1和 m2 与压缩阶数 N的关系满足一定的量子化条件 ,态 |ψ( 2 )m1 m2 〉q就恒处于等阶 N- Y最小测不准态 .2 )当态间的初始相位差 (θm2 - θm1 )在态间压缩区 [2 kθπ-π/ 2 + qj =1{R2jsin[(m2 - m1)π/ 2 ]},2 kθπ+π/ 2 + qj =1{R2jsin[(m2 - m1)π/ 2 ]}]内取值时 ,无论压缩阶数 N取奇还是取偶 ,只要相位调制因子 m1和 m2 与 N的关系式以及各模的初始相位φj等满足一定的量子化条件 ,态 |ψ( 2 )m1 ,m2 〉q就可呈现出周期性变化的 ,任意阶的等阶 N次方 Y压缩效应 .3)利用相位调制因子 m1、m2 与压缩阶数 N之间的解析关系式 ,可直接确定出 |ψ( 2 )m1 m2 〉q呈现等阶 N次方 Y压缩效应时的压?

第Ⅵ类两态叠加多模叠加态光场的等阶N次方Y压缩特性研究

本文构造了由多模相干态｜｛Ｚj｝〉q与多模虚相干态｜｛iZj｝〉q这两者的线性叠加所组成的第Ⅵ类两态叠加多模叠加态光场｜Ψ（２）６〉q。利用多模压缩态理论，研究了态｜Ψ（２）６〉q的广义非线性等阶N次方Y压缩特性。结果发现：1)在压缩阶数N＝2p且p＝2l(l＝1，2，3，…，…)的条件下，无论各模的初始相位φj(j＝1，2，3，…，q)、态间的初始相位差(θ（Ｒ）pq－θ（Ｉ）pq)以及各单相干态光场的平均光子数之和qj＝1Rj等如何变化，态｜ψ（２）６〉q总是恒处于偶数阶等阶NY最小测不准态。2)在压缩阶数N＝2p且p＝2l＋１（l＝0，1，2，3，…，…)的条件下，当各模的初始相位φj、态间的初始相位差(θ（Ｒ）pq－θ（Ｉ）pq)以及各单模相干态光场的平均光子数之和qj＝1R２j等分别满足一定的量子化条件(或者在特定的区间内连续取值)时，态｜ψ（２）６）q的第一及第二这两个正交分量总可分别呈现出周期性变化的偶数阶的等阶N次方Y压缩效应.