Journal of Southwest Petroleum University(Science & Technology Edition)

RESEARCH ON PERMIAN GONODONTS IN SICHUAN BASIN AND ITS SIGNIFICANCE TO OIL AND GAS

JIANG WU

1988, 10(2): 1-9. DOI: 10.3863/j.issn.1000-2634.1988.02.01

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The Permian is dominated by marine carbonate，which is a major zone of gas production in the' Sichuan, basin. Thirty three formation sections have been systematically studied and numerous data of conodonts have been collected. The Paper describes the author’s recent research results. According to the vertical and lateral distribution of conodonts discovered，ten conodont zones can be divided. A sequence of the evolution of Permian Neogondolella .And Ahchignathodus genus and the relationship of conodont color to the estimation of oil arid gas maturity are found.

BRACHIOPOD SEQUENCE AROUND THE LOWER-MIDDLE DEVONIAN BOUNDARY FROM YANMENBA OF LONGMEN, SICHUAN

DENG Tao

1988, 10(2): 11-21. DOI: 10.3863/j.issn.1000-2634.1988.02.02

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Four brachiopod zones are divided in the member of section at Yanmenba of Mt. Longmen .According to the principle of modern stratigraphy, the Lower-Middle Devonian boundary is drawn in the Euryspirifer yanme-nbaensis-Xenospirifer fongi Zone at the top of the Ganxi Formation, and the first appearance of Xenospirijer fungi is regarded as a sign. This boundary corresponds to the international bounbary-stratotype .A method is put forward to define a boundary between chronostratigraphic is units in a region without indicated fossil zones. It is proved that the sedimentary environment is a muddy shelf in the section member. Four new bracniopod species are described.

MODIFIED METHODS FOR ANALYSIS OF LIGHT HYDROCARBONS IN OILS AND CONDENSATES BY CAPILLARY COLUMN GC

Wang Hai-qing;Wang Ting-dong

1988, 10(2): 22-28. DOI: 10.3863/j.issn.1000-2634.1988.02.03

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For analysis of light hydrocarbons in oils and condensates a very common method consists of: first, a oil or condensate is distilled and，second，it is analysed by GC using a long and highly effective capillary column .In order to avoid the loss of some light hydrocarbons because of distillation, We used three modified methods: 1. direct sampling of pure Condensates. 2 .direct sampling of oils and condensate mixed with oil after asphaltene removal by propane and resin removal by Al2O3. analysis of C4—C8 light hydrocarbons by He extraction . To support these methods, we have designed and made a micro-capillary column-connector with zero-dead volume and some other supplementary equipment.

CORRECT UNDERSTANDING OF TWE PIPE-STRING NEUTRAL POINT

Wu Jiang

1988, 10(2): 29-38. DOI: 10.3863/j.issn.1000-2634.1988.02.04

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In this article, all definitions of pipe-string neutral point mentioned in previous occasions and their mechanical properties are analyzed in detail. The relationship between the neutral point, the axial zero-stress point and the neutral section is discussed. Answers are presented to such problems as whether the neutral point is the unstable demarcation point of the pipe-string while bent. This is beneficial to the correct understanding of the neutral point and its effect on engineering.

THE DESIGN At}D CALCULAT旧N OF THREE-DIMENSIONAL TRAJECTORIES OF WELLS

Peng Liang-yi

1988, 10(2): 39-49. DOI: 10.3863/j.issn.1000-2634.1988.02.05

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The design and calculation of 3-D directional well trajectories are analyzed and derived in detail. Mathematical equations for determining directional well trajectories are proposed. Using these equations, we can accurately calculate the coordinates of any point in the directional well trajectories. It is suggested that this method can be used in directional-well planning and calculating.

PRELIMINARY RESEARCH ON THE REPRODUCIBILITY OF THE SHALE ROLL EXPERIMENTS

Zhang Xiao-hua

1988, 10(2): 50-60. DOI: 10.3863/j.issn.1000-2634.1988.02.06

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In this paper, the method of shale roll experiment is reproducibility of the experiments is raised and the effect improved, of the type pint bottle on rate of recovery is found

NUMERICAL SOLUTION OF THE PLANE ONE-DIMENSIONAL PROBLEM OF ELASTIC DYNAMICS BY APPLYING THE METHOD OF CHARACTERISTIC CURVE

Pu Hong-zhang

1988, 10(2): 61-73. DOI: 10.3863/j.issn.1000-2634.1988.02.07

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This paper presents the numerical solution of the plane one-dimensional problem of elastic dynamics by applying the method of characteristic curve. Considering change of density, an equation of characteristic curve is established and the Riemann constant is found，an example has been calculated. The calculated result agrees with the physical process of the example.

QUANTITATIVE ANALYSIS OF THE QUARTZ CONTENT OF BENTONITE BY INFRARED SPECTRUM

Luo Xiu-zhan

1988, 10(2): 74-78. DOI: 10.3863/j.issn.1000-2634.1988.02.08

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This paper presents method of determining the quarts content of bentonite by the infrared spectrum, and discusses the effect of milling in making the sample on the result of analyses.

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