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    20 August 1988, Volume 10 Issue 3
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    地质勘探
    THIN-SECYION ANALYSIS AND VISUAL ESTIMATION OF RECOVERY FACTOR OF HE-3 MEMBER IN SANDSTONE SECONDARY PORE SYSTEMS IN SHUANGHE OIL FIELD
    Ma Qing Liu Xue-feng
    1988, 10(3):  1-10.  DOI: 10.3863/j.issn.1000-2634.1989.03.001
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    By using resin thin-section, the characteristics of secondary pore sys-tem
    in HE-3 member of sandstone are observed in Shuanghe oil field.
    Four porosityareas and nine types of pore networks are divided, and
    capillary pressure curves and pore structure parameters of corresponding
    samples are given out in this paper.On this basis, visually-estimated
    recovery factors of all kinds of pore networks are presented.And it is
    found that the oil recovery factor of HE- 3 member in Shuanghe oilfield
    is 40.5%，which is calculated by the weighted average method,
    FURTHER STUDY OF CALCULATING THE TERRAI CORRECTION . VALUE BY CIRCULAR ZONE METHOD
    Yang Zai-chao
    1988, 10(3):  11-16.  DOI: 10.3863/j.issn.1000-2634.1989.03.002
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    In this paper，we have discussed the dra wback which exists in the squ-
    are zone terrain correction scheme, and presented the circular zone terrain
    correction scheme based on the altitude data of the rectangular net.After
    comparing the differene between real values with the ,calculated values of
    the square zone terrain correction(by means of the compressed mass line
    and the 2-D numerical integration)，and of the circular zone terrain cor-
    iection, we think that the scheme presented here is feasible.

    石油与天然气工程
    A NEW CUBIC EQUAT旧N OF STATE
    Li Shi-lun Huang Yu Sun Lei Sun Liang-tiang
    1988, 10(3):  17-25.  DOI: 10.3863/j.issn.1000-2634.1988.03.003
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    By analysis of recently commonly used equations of state_, . a ne,w，equ-
    ati.,on of stateis presented in this paper,_ Gas . compressibility and- liquid
    density of pure components such as CH4 to C16H34, and, N2.CO2，as-well
    as compressibibility of hydrocarbon mixtures, for instance, the gas sample
    of wen-72 well in Central China Oilfield, are calculated by this new eq-
    uation, It -is shown that the equation can be used to predict volumetric
    properties of a system more accurately than the others with. awi.der - range
    of temperature and pressure.
    CALCULATION OF FOAM ACID FLOWING IN DYNAMIC STATE
    Xiong You_ming
    1988, 10(3):  26-35.  DOI: 10.3863/j.issn.1000-2634.1988.03.004
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    This paper has developed mathematical models of the range of temperature, pressure, flow rate and foam quality of foam acid flowing in dynamic state fracture, and presented the iterative computing, method to determine the distribution of the four parameters in widened fractures. The calculated results show that the effect of fracture temperature range must teken into account in the design calculation of foam acid fracturing.
    石油机械工程
    YIELD CRITERION AND CRACK EXTENSION CRITERION
    Zhan Ren-rui
    1988, 10(3):  36-44.  DOI: 10.3863/j.issn.1000-2634.1988.03.005
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    The shape and size of plastic zone at crack tip is discussed by Mises, Tresca, Twin shear stress yield criterions respectively in this paper. It is pointed out that along the boundary line of plastic zone at craok tip, proper mechaniccal parameters and their amounts are selected and compared to predict the critical extension of the complex crack. Here, corresponding crack critical extension criterions are developed by using the three yield criterions and choosing three parameters, Tomax, Eomax, rpmin (size of plastic ,zone).Predicted results of crack extensimn are compared with each
    critereion,
    经济管理
    A RANDOM.DECISION PROCESS AND ITS .OPTIMIZATION
    Zhang Ming-quan
    1988, 10(3):  45-55.  DOI: 10.3863/j.issn.1000-2634.1988.03.006
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    In this ,paper, it is assumed that a point at which a unimodal func-
    tion possesses a maximum value satisfies a given probability distribution,
    For a giveen policy, we have defined a sequential decision _procss, Given
    numbers s and d, we have discussed the optimality of the policy ,when
    mathematical expectation of the number of tests according to the policy
    s-been taken as an optimum criterion, and obtained a necessary and su-
    fficient condition that an optimal policy must satisfy, Meanwhile, we
    have discussed the optimization about nn-step policy when mathematical
    expectation of final 8-accuracy has been taken as an optimum criterion,
    and finally obtained similar results,
    基础研究
    QUANTIZATION OF ROBERTSON-WALKER GEOMERTY COUPLED WITH MASSLESS SPIN-1/2 FIELDS
    Wang Wen-fu
    1988, 10(3):  56-60.  DOI: 10.3863/j.issn.1000-2634.1988.03.007
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    This paper presents the exact solutions of wheeler-Dewitt s equation corresponding to Robertson-walker geomerty coupled with-massless spin-1/2 fields. The operatororder ambiguity of wheeler-Dewitt equation in the simple model is discussed. it has been proved that the universe will not contract to singularity in the model.
    基础学科
    A . NEWMETHOD SEQUENTIAL OF SYNCHRONOUS CIRCUIT DESIGN
    Gou yang-ming
    1988, 10(3):  61-70.  DOI: 10.3863/j.issn.1000-2634.1988.03.008
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    In this paper, a new method of synchronous sequential circuit desigh
    is presented on the basis of studying an automatic operation problem. in
    incompletely specified synchronous sequentil circuits, The method is suita-
    ble_not only for the incompletely specified Synchronous sepuential circu-
    its,The characteristics of this method lie in its visualization, simplicity
    and convenience, and in its. being easier to find the simplest logical futlc-
    lion of automatic operation,
    油田化学
    DETERMINATION OF COPPER IN NON-CHROMIUM-LIGNOSULFONATE—IODOMETRIC METHOD AND ITS IMPROVEMENT
    Yang Shi-guang
    1988, 10(3):  71-76.  DOI: 10.3863/j.issn.1000-2634.1988.03.009
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    The copper in the lignosulfonate can be determined by the indirect iodometric method. To decompose the sample, we can put in some H2SO4 (1: 1)and some solid (NH4)2S2O8, which is a strong oxidant in an acidic medium. The interference from the iron (Ⅲ) in the sample can be oliminated by the addition of a mixed masking agent NaF+K2[CH(OH)COO)2. And the iodine absorbed by the solid I2can be released by the addition of thiocyanate ion.
    基础学科
    ANALYSIS OF CHARACTERISTICS OF THE COLOUR POSITIVE
    Liu yuan-she
    1988, 10(3):  77-80.  DOI: 10.3863/j.issn.1000-2634.1988.03.010
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    On the basis of colour theory, the experiment of interlamina-r effect is
    made for the colour positive.This article analyzes such eharactexistics as
    sensitivity, fog density and contrast of the colour positive.It also points
    out that under relevant conditions, the correcting method for colour non-
    equilibrium has guiding significance in the developing and printing process
    of colour positive.
    石油机械工程
    COMPUTATION FORMULA OF NATURAL FREQUENCIES OF SINGLE-DEGREE-OF-FREEDOM-SYSTEMS
    Liu Chao-tang
    1988, 10(3):  81-85.  DOI: 10.3863/j.issn.1000-2634.1988.03.011
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    The expression of dynamics of single-degree-of-freedom systems vibra-
    ting freely to the extreme position is derived in this paper from DAlem-
    bert-Lagrange principle and vibrational behaviors of single-degree-of-free-
    dom systems, It can be used directly to calculate natural frequencies of
    single-degee-of-freedom systems
    石油与天然气工程
    A NEW SOLUTION OF ROTARY MAGNETIC FIELD
    Luo Xu-guang
    1988, 10(3):  86-93.  DOI: 10.3863/j.issn.1000-2634.1988.03.012
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    There are a number of ways of analyzing a rotary magnetic field, The
    solution mentioned in this paper is a supplement to, and.: a development
    of, the graphical method of the vector, This iiew solution is of guiding
    significance, particularly to analyzing a motors rotary mag成tic field师
    triangular connection,