石油实验地质

RECENT ADVANCES IN DEVELOPMENTS OF SEDIMENTOLOGY

Wu Chongjun

1986, 8(1): 1-7. doi: 10.11781/sysydz198601001

Abstract(653) PDF-CN(280)

Abstract:
This paper is a part of the "Opening Speech" of the Second National Sumposium on Sedimentary Facies of Clastic Rocks held in Daqing City in sept. 1985. It introduces and studies the recent developing trends of sedimento-logy at home and abroad.Moreover, it proposes a new way for the national researches on sedimentology in the future. In these years, the sedimentology emphasizes the integrated analyses on the indicators of multiple facies and opens up a new frontier for the development of production. Meanwhile, it attaches a great importance to modern sedimentation, event deposition and modelling experiments of flume, seeking for a new depositional mechanism and its model. The oil/gas and saline deposits in China are closely related to the depositional environment of non-marine, lacustrine facies. Therefore, it is a great significance for the national sedimentologist to establish and develop the lacustrine sedimento-logy.

RECENT ADVANCES IN DEVELOPMENTS OF SEDIMENTOLOGY

Xia Bangdong

1986, 8(1): 8-21. doi: 10.11781/sysydz198601008

Abstract(779) PDF-CN(379)

Abstract:
First of all, this paper relates N.S.Schatski's researches on aulacogen and the development of its conception with the advent of plate tectonic. It is suggested the Early Paleozoic sedimentary basin of the west part of Zhejiang Province is an aulacogen with NEE extension and the Caledo-nian geosynclinal-folded zone of South China located at the south side might take a turn from north east-east to north in the area out of the mouth of Yangtze River. The aulacogen was confined by two boundary faults and opened eastward as horn shape.Its range showing in the spread of sedimentary geological body is completely coincided with the convex of the Moho's surface. The upward amplitude of Moho's surface progressively increases eastward, which indicated the amplitude of basin subsidence to be inhanced along the same direction. It also accords with the geological facts. The evolution of the aulacogen underwent three stages: the hot uplifting and graden type rifting, the broad downwarp and the rapid filling and dying out. Seven formations were deposited accordingly in continental and shallow sea environments. This evolution feature is similar to that of typical aulacogen and has a close relation with the evolution of Caledonian geosynclinal-folded zone of South China. Both of them were synchronous in development and had a similar evolutional direction and stages. On the other hand, their properties of formations are markedly different from each other. These show that they were formed by same deep geological process but underwent different developments and environments afterward.

THE DEPOSITIONAL ENVIRONMENT OF SALT ROCKS IN DONGPU DEPRESSION

Gu Jiayu

1986, 8(1): 22-28. doi: 10.11781/sysydz198601022

Abstract(689) PDF-CN(359)

Abstract:
Dongpu Depression is asecond graded structure unit in Pohai Gulf Basin with thick formation of salt-sediments interbedded with dark mudstones developed during Paleogene. In this paper, the rhyme, cycle, structure and ecological properties of contained fossils in the depression are discussed and the author suggests that the salt rocks were generated in a depositional environment of still-stand deepwater and probably experienced sea water immersions in a short period expect for the salt rocks derived from surface flows. The various haloclines formed in saline lakes caused multiple dissolutions and crystal sedimentations of halogen rocks foming the saline deposits. Based on macroscopic viewpoint, the saline deposit is controlled by the highland bailt up with the marginal deep faults and is a typical example of "high mountain-deep basin" saline model.

AN APPROACH TO THE REGULARITY OF OIL/GAS DISTRIBUTON IN PALEOGENE DEPRES-SIONS WITH A PRACTICAL EXAMPLE OF A PETROLIFEROUS AREA IN NORTH CHINA

Yang zhaoyu

1986, 8(1): 29-35. doi: 10.11781/sysydz198601029

Abstract(570) PDF-CN(265)

Abstract:
The depressions of paleogene are rich in oil/gas resources and hundrands of oil/gas fields have been discovered. Large oil fields are not only distributed in large depressions but also in small-scale depressions. In some small but rich in oil and gas depressions, the oil reserve can reach 100-150 million ton within a thousand sq.Km. The distributions of oil/gas in depressions are controlled by three key factors of space configulation, growth faults and depositional system of source rocks. The various depressions would contain different oil and gas accumulations due to the changes of the three factors, then formed various types of oil and gas pools.

PRELIMINARY STUDIES ABOUT TECTONIC-PETROLOGY PROBLEMS OF THE MESOZOIC-CENOZOIC BASALTIC SERIES IN EAST CHINA

Xu Yongyuan, Qing Deyou, Tong Fushen

1986, 8(1): 36-49. doi: 10.11781/sysydz198601036

Abstract(553) PDF-CN(298)

Abstract:
This paper is offered for exploring the regional and geohistorical distributive regularities, petrochemical characteristics and evolutional tendency, as well as the magmatic differentiation and genesis of the Meso-Cenozoic basaltic series in East China. The correlations between basalt evolution basin developments and plate tectonic movements are also discussed.

MATHEMATICAL GEOLOGY RESEARCH ON THE THERMAL EVOLUTON OF PALEOZOIC COAL-SERIES OF SHANGANNING BASIN

wang Shaochang, Fu Suotang

1986, 8(1): 50-57. doi: 10.11781/sysydz198601050

Abstract(642) PDF-CN(357)

Abstract:
Shanganning Basin is a major Mesozoic inland basin with an area of 230000Km². There are evident differences in geothermic gradient depending on the burial depth of Mono-discontinuity. Using the relationship between temperature and vitrinite reflectance, it is possible to obtain the apparent palaeo-geothermic gradient which bears an inverse linear relation-ship to the burial depth of mohorovicic discontinuity. It is revealed that the value of vitrinite reflectance representing the maturity index of the upper palaeozoic source rock depends on the burial depth of mohorovicic discontinuity and that of the source rock itselt, and an equation for relating them has been worked out. Using multiple regression analysis for vitrinite reflectance, and the burial depth of mohorovicic discontinuity and the source rock, an empirical equation has been deduced to give the quantitative parameters for evaluating the hydrocarbon source rock of a new area and the erosional magnitude to be restored.

AN APPLICATION OF HASP IN ASSESSMENT OF OIL AND GAS RESOURCES

Chen Xuefu

1986, 8(1): 58-71. doi: 10.11781/sysydz198601058

Abstract(775) PDF-CN(249)

Abstract:
This article uses HASP method to analyse the structure of a random sampling model. It introduces the principles of Monte Carlo Method and discusses the faults and mistakes in the present-day applications.

STUDY ON THE FORMATION OF RESIDUAL WATER WITH TRANSPARENT POROUS MODELS

Qu Zhihao, Kong Lingrong

1986, 8(1): 72-78. doi: 10.11781/sysydz198601072

Abstract(608) PDF-CN(356)

Abstract:
A transparent porous model and the related experimental method are recommended. The various types of residual water observed in this model during displacing water by air (or kerosene) under water-wet condition are described.The experimental results of this model indicate that the hete-rogeneity of pore structure plays an important role in the formation of residual water, the process of which is excellently demonstrated in the photographs presented in this paper.

CONDENSATE ANALYSIS BY GAS CHROMATOGRAPHY

Wu Jie, Zhang Yijia

1986, 8(1): 79-83. doi: 10.11781/sysydz198601079

Abstract(669) PDF-CN(279)

Abstract:
Fused capillary column coated with OV-101 is used in this new method. The distribution of hydrocarbons in some condesates samples has been studied with 15m column. For the prefractionization (below 130℃)of condesates, the seperation was carried out on a 50m column. More than 63 peaks (up to NC₈) are identied with their corresponding Van Den Dool indices. The analytical conditions are listed. The results and their geochemical applications have been discussed.

CONDENSATE ANALYSIS BY GAS CHROMATOGRAPHY

Qian Jisheng, Chen Yipin

1986, 8(1): 84-89. doi: 10.11781/sysydz198601084

Abstract(779) PDF-CN(308)

Abstract:
Under certain selected experimental conditions, the authors study the whole process of thermal degradation of kerogens. Meanwhile, based on the evidence of DTG curves, the analyses of mixed degree of organic matter from different sources and the classification of kerogen types are carried out. With increasing temperature, the instantaneous reactions composing a DTG curve in releasing sequence of decomposed products can be taken to some extent as a modelling alteration profile of organic matter in geological bodies. Moreover, the weight lost in the whole process of thermal degradation of organic matter can be used to calculate the theoretical oil and gas productivities in various evolutional stages. It also can be used to assess oil/gas resources in combination with geological data.

AN ALGORITHM OF GRAIN SIZE PARAMETERS

Zhang Zukui

1986, 8(1): 90-93. doi: 10.11781/sysydz198601090

Abstract(549) PDF-CN(267)

Abstract:
The author write a program of algorithm for analysing grain size para-meters on the pocket calculator (CASIO-TX-602 P) in order to do the systematization and statistic of grain size data. The program can calculate 9 values of various parameters of mean size, standard deviation, skewness, kurtosis, etc.. Thus, it is convenient for analysing the populations of samples, sections and stuctures.

CALCULATION OF THE ELEMENTAL CONTENT USING PEAK-HIGH VALUES INSTEAD OF INTEGRATED VALUES ON MODEL 1106 ELEMENTARY ANALYZER

Song Gexi

1986, 8(1): 94-96. doi: 10.11781/sysydz198601094

Abstract(496) PDF-CN(308)

Abstract:
Peak-High Values instead of Integrated Values are used to calculate the elemental content of an organic matter because many faults occur when Model 1106 Elementary Analyzer is running. It is proved by practices that the method of Peak-High Value is feasible with allowable deviations.

1986 Vol. 8, No. 1

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