Journal of Southwest Petroleum University(Science & Technology Edition)

RELATIONSHIP BETWEEN BIOMARKER DISTRIBUTION AND PALAEO-ENVIRONMENTS IN UPPER TRIASSIC OF ZHONGBA, NORTHWEST OF SICHUAN

Cai Kaiping Wang Tingdong

1991, 13(1): 1-8. DOI: 10.3863/j.issn.1000-2634.1991.01.001

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This paper discusses the relationship between the distribution of biomar- kers and the sedimental environments including the input of materials, the depth of water, the sality and oxidation-reduction conditions in Upper Triassic of NW of Sichuan. Therefore, biomarkers can be used to reconstruct the palaeoenvironments of this area.

DESIGN AND REALIZATION OF DRAWING SYSTEM OF MICROCOMPUTER APPLIED IN GEOPHYSICAL PROSPECTING

Du Chaomin Chun Dingguo

1991, 13(1): 9-14. DOI: 10.3863/j.issn.1000-2634.1991.01.002

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Drawing is a very important link of digital processing in geophysical prospecting. Especially in scientific research, drawing up of the results of experiments with a new method is a necessary means to testify the new method and select the parameters. We have chosen the commonest IBM microcomputer and its outer equipment, exploited its drawing function, and compiled for geophysical prospecting drawig a special software, by means of which most pictures needed in scientific research and teaching can be drawn. After being used in practice,it has proved to be highly effective.

ON RULE OF METEORITE SERIES CONTROLLED BY THE CRYSTAL LATTICE ENERGY

Hong Qingyu Den Tao

1991, 13(1): 15-22. DOI: 10.3863/j.issn.1000-2634.1991.01.003

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The crystal lattice energy of meteorites can be found with a calculating method. It increases in proper order from iron meteorites, carbonaceous chondritie meteorites, chondritie meteorites to non-chondritic meteorites. The formatiom of meteorites is controlled by the crystal lattice energy. The formation series arises from low to high sequence according to the crystal lattice energy, and has the same rule controlled by the crystal lattice energy as the crystalline process of the minerals and rocks in the earth.The coefficient of the crystal lattice energy and the average gram atomic weight of meteorites accord with the following function relation.

MAKING HIGHER THE RESOLUTION OF FREQUENCY SPECTRUM BY INTERPOLATING SAMPLES AND SETTING THE VALUE OF INTERPOLATING SAMPLES TO ZERO

Sa Liming

1991, 13(1): 23-28. DOI: 10.3863/j.issn.1000-2634.1991.01.004

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The analysis of frequency spectrum is an important link in seismic data processing. The algorithm of FFT(Fast Fourier Transform) is used in the module TRAFO to analyze the frequency spectrum. Its resolution is directly proportional to the length of time window. When the length is smaller than 2000ms, the resolution is too low to be used in processing. A wonderful method of interpolating samples and setting the value of interpolating samples to zero, which makes the resolution higher, is presented in this paper.The resolution of frequency spectrum can certainly meet the needs of the practical processing.

NEW METHOD OF CALCULATING BHP OF GAS-CUTTING MUD

Zheng Yonggang Hao Junfang

1991, 13(1): 29-40. DOI: 10.3863/j.issn.1000-2634.1991.01.005

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In view of gas slip in the mud and gas weight, the formulas of calculating dynamic BHP of gas-cutting mud and computer programs have been developed in this paper. The new method has been compared with that one generally used in the past in case the gas slip and gas weight were neglected. From this a conclusion can be drawn that when the well depth is within 2000 to 4000 meters, gas slip has an obvious effect on BHP. The abs olute error may be up to 1.92 MPa, and the relative error 5.8%. Gas weight also has some influence on BHP,the absolute error may be up to 0.77MPa and the relative error 2.3%.

TECHNICAL AND ECONOMICAL ANALYSIS OF DESIGN OF PARALLEL PIPE AND VARIABLE DIAMETER PIPE IN GAS TRUNK PIPELINE-MINIMUM COST METHOD

Liu Xiantao Li Jian

1991, 13(1): 41-48. DOI: 10.3863/j.issn.1000-2634.1991.01.006

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In order to adjust the distance between compressor stations or increase the transporation quantity of gas trunk pipeline, it is often necessary to lay a certain length of parallel pipe and variable diameter pipe in nhe design of gas trunk pipeline. From the point of view of the lowest investment, the paper has dealt with the functional relations between the investment in parallel pipe and variable diameter pipe and the pipe diameter, and established the corresponding mathematical model, according to which it has given the formula and method of calculating the optimum technical parameters-diameter,thickness,and length-of parallel pipe and variable diameter pipe in gas truck pipeline.

HOW TO FORECAST INVESTMENT IN OFFSHORE DRILLING PLATFORMS IN CHINA

Liu Chaoquan Li Guangyiao

1991, 13(1): 49-56. DOI: 10.3863/j.issn.1000-2634.1991.01.007

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Before decision-making period, feasibility study and economic evaluation analysis should be done prudently. One important task is to forecast the investment in platforms. By analyzing the forecast methods at home and abroad and using the knowledge of Economics and Mathematical Statistics, this paper gives out a new forecast method which is much more efficient than those used in the past.

PROTECTION OF THREE-PHASE INDUCTION MOTORS FROM SINGLEPHASE OPERATION

Li Fengzhen

1991, 13(1): 57-65. DOI: 10.3863/j.issn.1000-2634.1991.01.008

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We have discussed in this paper the advantages and disadvantages of protective circuits in three-phase induction motors from single-phase operation and the troubles which should be given attention to.

INTERPOLATION METHOD OF IMPROVED PRECISION

Zhong Shouyan Chen Lianghao Kang Xiaohua

1991, 13(1): 66-72. DOI: 10.3863/j.issn.1000-2634.1991.01.009

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An improved interpolation method has been put forward on the basis of point-to-point comparision in this paper. The anthors have related the priociple of this method, derived recursion formulas of the interpolation for lines, ane designed the interpolating program.

OPTIMAL DESIGN METHOD OF SPRING

Yan Qun Chui Lan

1991, 13(1): 73-77. DOI: 10.3863/j.issn.1000-2634.1991.01.010

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Spring design is made mostly with the basic formula method, which is unable to be used to appraise whether the design is optimal or not although the structural performance can be satisfied. The constraint stochastic method is used in this paper to make an optimal design of spring and give an optimal solution. The procedure of this method is first to define the type of spring and set up optimal model——objective function and constraint function——using basic formula, and then to make calculation with computer,and finally to get optimum design programme.

STATIC ANALYSIS OF SUSPENDED PIPELINE FOR NON-FLEXIBILITY

Liang Zheng

1991, 13(1): 78-84. DOI: 10.3863/j.issn.1000-2634.1991.01.011

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On the basis of discussing simply the existing methods, this paper proposes a calculating model and obtains satisfactory solutions through theoretical analysis. Finally, an example is used to show the effects of concerned parameters and to make contrastive analysis of the existing results.

SOLUTION OF ONE ILL-POSED PROBLEM

Liu Liangjian Jiang Maoze Zeng Ziqiang

1991, 13(1): 85-96. DOI: 10.3863/j.issn.1000-2634.1991.01.012

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Mathematical models of the mainline and branches of complex branch-like pipeline network system are nonlinear partial differential equation systems. In some cases, the equation systems can be linearrized, and then be solved with analytical methods. The simultaneous mathematical model is a Volterra integral equation system of the first kind based on the relation connection conditions between the mainline and the branches. Usually the solution of integral equation of the first kind is not stationary, it must be solved with particular methods.Therefore,the method in this paper is proved reliable and practicable.

SOLUTION IN WIDER SENSE OF TRANSIENT FLOW MATHEMATICAL MODEL OF COMPLEX BRANCH-LIKE PIPELINE NETWORK ON LOOP

Wu Xiaoqing Zeng Ziqiang Jiang Maoze

1991, 13(1): 97-108. DOI: 10.3863/j.issn.1000-2634.1991.01.013

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In consideration of the practical transient flow of complex branch-like pipeline network on loop, it is the first time that we have presented in this paper the mathematical model, which is a system of partial differential equations with initial conditions and boundary conditions, an initial-boundary value problem. We have proved that the solution of the initial-boundary value problem is existent and unique by the theory of semigroups of linear operators, and we have obtained the solution in wider sense with the operator series method.

AN IMPROVED METHOD OF FUZZY SIMILAR CHOICE

Geng Xingyu

1991, 13(1): 109-113. DOI: 10.3863/j.issn.1000-2634.1991.01.014

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In this paper, certain improvement is made in the method of Fuzzy similar choice determined by the ratio of distance, so that it can be adopted to arrange the elements in order of superiority directly based on Hamming Distance so as to save a large amount of computing work.

PRINCIPLE OF A DIGITAL INTER-COHERENT DETECTION METHOD OF VOLUME OF MULTIPHASE FLOW

Gou Yangming

1991, 13(1): 114-120. DOI: 10.3863/j.issn.1000-2634.1991.01.015

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new method of measuring the volume of flow in a producing oil well according to the inter-coherent detection theory is presented in this paper. The principle of the new method, the design of sensing units, the process of signal management. and the ways, steps and programing of digital intercoherent management with a microcomputer are mainly introuced here.

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