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1.
井间示踪剂分析技术   总被引:1,自引:0,他引:1  
根据现有示踪剂解释方法存在的问题 ,提出了描述示踪剂运移规律的半解析法的数学模型。该模型考虑了两类示踪剂的弥散、吸附滞留以及分配示踪剂滞后等特点 ,并吸收了示踪剂解析法和数值法的优点 ,将三维问题转化为一维问题。由于用解析法求解浓度不存在任何截断误差 ,且浓度的解总是位于合理解的范围内 ,故采用解析法求解产出液浓度。该方法可用于模拟任何可能的地层分布情况 ,不存在辅助算法的不稳定性等问题。利用计算机完成繁杂的解释任务 ,可以避免人为的反复调参过程。运用所建立的解释方法对开发试验区资料进行了解释 ,解释结果与取心井资料的解释结果基本一致 ,且解释结果已应用于后续的开发调整。  相似文献   

2.
针对井间示踪剂产出曲线解释方法存在的问题,提出了井组示踪剂产出曲线的解释方法。建立了以一口注入井对应的多条产出曲线总体拟合最优为目标函数、以相应的注水量和井组面积等静、动态参数为约束条件的解释模型。利用遗传算法实现了产出曲线的自动拟合,避免了最小二乘法中求偏导数困难的问题,提高了求解的速度和精度。实例应用表明,提出的解释方法具有较强的可靠性。  相似文献   

3.
针对井间示踪剂产出曲线解释方法存在的问题,提出了井组示踪剂产出曲线的解释方法.建立了以一口注入井对应的多条产出曲线总体拟合最优为目标函数、以相应的注水量和井组面积等静、动态参数为约束条件的解释模型.利用遗传算法实现了产出曲线的自动拟合,避免了最小二乘法中求偏导数困难的问题,提高了求解的速度和精度.实例应用表明,提出的解释方法具有较强的可靠性.  相似文献   

4.
针对常规砂岩油藏注气体示踪剂解释方法基于储层连续介质假设,不适用于大尺度缝洞离散组合的缝洞型油藏问题,考虑了气体示踪剂在大尺度溶洞区中径向迁移扩散及裂缝中一维迁移二维扩散的传输方式,引入了井间分配系数、相间分配系数及裂缝分配系数,建立起缝洞型油藏注采井间气体示踪剂解释物理和数学模型,求解模型并绘制了气体示踪剂浓度理论采出曲线。对该模型进行了参数敏感性分析,探索了溶洞大小、裂缝条数与长度、扩散系数、注气速度及示踪剂注入量对产出曲线的影响规律。研究表明,溶洞越大,浓度曲线峰值出现时间越迟;裂缝长度增加,峰值滞后,条数增多,峰值越多。对塔河油田TK425井组注气体示踪剂实测响应曲线进行了拟合解释,计算了溶洞区体积及注采井间裂缝流道。缝洞型油藏注气体示踪剂解释模型能够有效判断井间连通性,计算地层参数,认识储集体分布情况,为井组注气提高采收率提供理论支撑。  相似文献   

5.
用通用解析法求解二维无界场的电场分布   总被引:1,自引:0,他引:1  
提出了一种新的求解拉普拉斯方程或泊松方程的解析法,该法具有通用性,可求解具有复杂边界形状的二维有界静态电磁场和无界静态电磁场,文内用该解析法求解了两例二维无界静电场问题,计算结果同理论值的比较表明,误差较小。  相似文献   

6.
用同伦摄动法求解第一类超奇异积分方程   总被引:1,自引:0,他引:1  
大量的物理学问题和工程问题等都可以用超奇异积分方程描述,但此类方程解析解的求解非常困难.因此相关领域的研究者将其目光投向了对其数值解的研究上.文中采用同伦摄动法求解了第一类超奇异积分方程,并运用数值算例验证了所用方法的有效性,最后将该方法应用到了断裂力学问题的求解中,且将得出的裂纹尖端应力强度因子的解与其解析解进行对比.由对比结果可知该方法在求解含裂纹的断裂力学问题时是非常有效的.  相似文献   

7.
采用解析方法研究了上随体Maxwell流体管内非定常流动问题,指出了该问题可归结为一个高阶非线性偏微分方程的求解问题,利用Chebyshev多项式的不同项数为基底的谱方法成功地将偏微分方程化为常微分方程组问题来处理,然后用Laplace变换法和本征值方法求解常微分方程组得到问题的解析结果。  相似文献   

8.
本文用Adomian分解法求解了一类非线性振动问题,从而不需任何假设条件下得到了逼近解析解。并以Dufing方程为例讨论其解。  相似文献   

9.
基于谱方法的管内非牛顿流体非定常流动   总被引:1,自引:0,他引:1  
以上随体Maxwell流体为非牛顿流体介质,探索了一种用谱方法解析处理水平圆管内非牛顿流体非定常流动的方法.该非定常问题归结为一个非线性二阶偏微分方程的求解问题.用谱方法将非线性二阶偏微分方程求解问题化为常微分方程组Chebyshev多项式数的近似问题,用Laplac变换法和本征值方法求解常微分方程组得到问题的解析结果.  相似文献   

10.
超导约瑟夫森结直流I-V曲线的数值计算   总被引:1,自引:0,他引:1  
基于超导约瑟夫森结的RCSJ模型的解析式为一非线性的二阶微分方程,对于该微分方程直接求解析解比较困难,故采用四阶龙格库塔法进行数值计算求解。经反复调用龙格库塔函数可得出约瑟夫森结的I—V曲线。并且,对这一求解过程及其关键部分进行了阐述,数值计算结果定性地解释了实验结果。  相似文献   

11.
Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.  相似文献   

12.
The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3~4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰~ -7.8‰, PDB) and matrix dolomites (-6.6‰~ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084~0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078~0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.  相似文献   

13.
王慧 《科技信息》2008,(10):240-240
Wuthering Heights, Emily Bronte's only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.  相似文献   

14.
The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.  相似文献   

15.
理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。  相似文献   

16.
何延凌 《科技信息》2008,(4):258-258
Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women's language from these perspectives: pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women's language, more attention should be paid to language use in social context. What's more, the linguistic phenomena in a speaking community can be understood more thoroughly.  相似文献   

17.
As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.  相似文献   

18.
There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.  相似文献   

19.
AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…  相似文献   

20.
Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.  相似文献   

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