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1990 Vol. 12, No. 1

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TECTONIC EVOLUTION AND HYDROCARBON DISTRIBUTION IN NORTH CHINA BASIN
Chen Guanghan
1990, 12(1): 1-7. doi: 10.11781/sysydz199001001
Abstract(637) PDF-CN(361)
Abstract:
Since Mesozoic,the platform of east China had been transformed to active continental marginal belts.Structural units of faulted upwarping,falldown depression,platform folding belts had been formed through tectonic deformations during Indo-chinese,Yanshan and Himalaya periods.Under stretching force,north China basin formed itself into a tensional falldown basin.The conditions for oil generation were different due to basemental structure and subsidence rate.There are three stages of structural evolution for tentional basin,relative to basin development are early period of faulted subsidence,filling period of faulted subsidence and regional depressing period.Three stratified structures,i.e hydrocarbon pool in burial hills,original hydrocarbon pool and draped hydrocarbon pools were developed.Hydrocarbons were mainly accumulated in the pools capable of self generation and preservation,from lower Tertiary of filling period of faulted subsidence.
CHARACTERISTICS OF TECTONIC GEOLOGY AND HYDROCARBON FOR MESOZOIC ERLIAN BASINS
Wang Bing
1990, 12(1): 8-20. doi: 10.11781/sysydz199001008
Abstract(633) PDF-CN(425)
Abstract:
The basement of Mesozoic Erlian basins is a fold of late Palaeozoic.Numerical palaeo-terrains were separated duing several cleavages and closures between Siberia and Sino-Korea palaeo-plates;and epicontinental sea sedimentation was dominant in middle and lower Carboniferous and lower Permian.On the whole,there were brittle masses enveloped in ductile folding belts with different rigidities and low consolidation.It was very influential on the formation of Mesozoic continental basins.No centralized catch basin appeared during Mesozoic,but the basin-range structures in the form of basin group were marked.During the evolutional stages of comp-ressional rising,stretching rifting deppression and compressional rising,the stretching rate of faulted subsidence was only about 20%,while the violent remoulding took place in later period,and basins(faulted subsidences)can be divided into two types and six subtraps.Seven original types were recognized for secondary structural belts with different evolutional histories,resulting in differences in the generation,accumulation and preservation of hydrocarbons.
DISCUSSION ON THE ASSEMBLAGE CHARACTERISTICS OF CLAY MINERALS IN THE JIANGHAN BASIN AND THEIR SEDIMENTARY ENVIRONMENT
Dai Xianzhong, Li Lingli
1990, 12(1): 21-29. doi: 10.11781/sysydz199001021
Abstract(598) PDF-CN(302)
Abstract:
Jianghan Basin is a non-marine faulted-down basin developed during Cretaceous time.During the period from Cretaceous to the end of Tertiary,the whole basin gradually contracted and the distributive areas of individual sedimentary sequences reduced from the area of the Xinjingzhui Formation over 24100km2,to that of the Qianjiang Formation over 10460km2.Both of the two are of major source beds and exploratory targets.A set of unique characteristic clay minerals in these two formations are dominated by illites(90-900%)with a little chlorites(usually less than 7.7%),the unitary and stable mineral species would not be controlled by horizon and depth,neither would change with temperatures and pressures.What the principle factor on such an assemblage characteristics is the water body of the basin.Based on available data,it is proved that the Jianghan Basin had been a lacustrine basin controlled by transgression and regression.In addition,with the application of SEM,the determination of surface characteristics of quartz particles,and the mappings of the transgressive water body boundaries during the sedimentation of 43-42 sand bed in the Qianjiang Formation of the Qianjiang Depression are also made in the paper.
APPLICATION OF RELAXATION TIME T1F ‘H NMR SPIN LATTICE AS ORGANIC MATURATION INDEX
Li Zhenguang, Zhang Lianjin
1990, 12(1): 30-35. doi: 10.11781/sysydz199001030
Abstract(789) PDF-CN(316)
Abstract:
H NMR T1 measurements were carried out oa 23 kerogen samples of mudstones from three wells in the Hailar Basin,which revealed the relationship of 'H NMR T1 of kerogen with Tmax(max.pyrolytic temperature)and R°(Vitrinite Reflectance),and comments are made on the experimental results.
ON THE MECHANISM AND THE CHARACTERISTICS OF EARLY CAMBRIAN“STONE COAL”IN LOWER YANGTZE REGION AND THEIR RELATION TO PETROLIFEROUS POTENTIALS
Zhou Haoda
1990, 12(1): 36-43. doi: 10.11781/sysydz199001036
Abstract(684) PDF-CN(370)
Abstract:
Through Cambrian geohistory of Lower Yangtze area,only at the beginning of early Cambrian could"stone coal"be formed and wide spreaded throughout the area.The stone coal was the result of synsedimentation of fungous algal organic remains and gel siliceous deposits.The conditions of its formation are dominated by the following three decisive factors 1.abundance of fungous-algae;2.palaeogeographic location-the slope section of basins with anoxic viscous flow;3.the sedimentation(the condition of burial history)."Stone coal" contains abundant organic matter,with organic compositions of 50-55%.The environments of anoxic viscous flow basin in which "stone coal" formed is the most favourable to oil generation.Thus the "stone coal" is considered as major source series and oil and gas have been generated and migrated during its geological history.
ON THE ORIGINS OF THE PERMIAN SILICEOUS ROCKS IN JIANGSU-ZHEJIANG—ANHUI PROVINCES AND THEIR RELATION WITH THE GENERATION OF OIL AND GAS
Xu Weimin
1990, 12(1): 44-48. doi: 10.11781/sysydz1990010044
Abstract(1107) PDF-CN(394)
Abstract:
In the study areas,the Permian siliceous rocks consisting mainly of large amount of siliceous organic remains which dissolved into colloidal solution of SiO2 and preserved in the sediments were formed by the replacement during the early stage of diagenesis-epigenesis.During the siliceous replacement,the original pores and path ways were filled up by replaced siliceo-us matters,the primary porosity and permeability of the rocks thus reduced.Therefore,it is unfavourable for the conversion of organisms into hydrocarbons and the subsequent migration.Nevertheless,the easily fractured siliceous rocks being frail,are favoured to forming fissured-type primary oil pools.
SIMPLIFICATION OF PYROLYSIS—GAS CHROMATOGRAPHY PARAMETERS FOR KEROGENS AND ITS SIGNIFICANCE
Zhang Dajiang, Li Jinchao, Huang Xiaoming, Zhou Zhuhong
1990, 12(1): 49-55. doi: 10.11781/sysydz199001049
Abstract(790) PDF-CN(310)
Abstract:
In order to determine PY-GC parameters of kerogen,certain compounds are selected to replace the other similar compounds.The results show that these parameters may after all be of geochemical significance and practice.Moreover,the difficulties in spectrogram determination and the calculation of the parameters are greatly reduced,which would be useful to the application of PY-GC analysis technique.
THE CHARACTERISTICS OF INFRA—RED SPECTRA FOR UPPER TRIASSIC COAL SERIES IN THE SICHUAN BASIN
Cao Wei
1990, 12(1): 56-63. doi: 10.11781/sysydz199001056
Abstract(601) PDF-CN(312)
Abstract:
The characteristics of Infra -Red spectra for the upper Triassic coal series in the Sichuan Basin are studied.Based on the analysis on the data from more than 20 wells,three absorption peaks associated respectively with structures of alkane-chain,benzene ring and radicals of hetero-atoms have been distinguished,and it reveals the characteristics of the upper Triassic source rocks,coal and crude oil constitutions.In addition,the study provides basis for the determinations of sedimentary environment,organic types and oil gen-erating potential.
STANDARDIZATION ON THE CURVES OF PERMEABILITY AND CAPILLARY PRESSURE
Chen Yuanqian
1990, 12(1): 64-70. doi: 10.11781/sysydz199001064
Abstract(747) PDF-CN(577)
Abstract:
Since the parameters of the permeability and the capillary pressure curves are important for characterizing reservoirs,the standardization of these two curves is proposed in this paper.Generally,permeability and capillary pressure curves of reservoirs are measured directly from experiments on small core samples under simulated reservoir conditions.With the different curves of the two parameters,dimensio-nless relationship can be abtained by the standardization suggested in this paper,which may be used in the correlation of reservoir properties and to obtain typical curves of the permeability and capillary pressure for the reservoirs.
DIRECT MEASUREMENTS OF FERRO FROM PYRITE IN FACIES ANALYSIS
Wang Ziyu, Cao Jian
1990, 12(1): 71-75. doi: 10.11781/sysydz199001071
Abstract(756) PDF-CN(332)
Abstract:
The ferrous content is used to be converted from the sulfur determination(the difference between total sulphur and sulphate-sulphur).Therefore,the influence of natural sulphur,organic sulphur and other forms of sulphied matters existing in the rocks are not taken into consideration.Besides the whole process is a complicated operation needing a lot of time,costs and overlaborate procedures.Should there be considerable indissoluble or indissovable sulphate(such as barite,alumstone,gypysum)in hydrochloric acid of the rock,the measurements would be even more difficult.For this reason,the experiments of direct measurements on ferro from pyrite are carried out.In the experiments,soluble ferro(Fe2O3)was separated by a mixed acid with l:1 hydrochloric acid and 1:1 phosphoric acid solutions;and then the residue of which is dissolved with l:l nituic acid,and the ferrous content(FeOFeS2)is determined from pyrite.
DSC EXPERIMENTAL ANALYSIS ON THE MATURATIONS OF KEROGEN EVOLUTION
Zhou Guoqing, Zhang Wei
1990, 12(1): 76-81. doi: 10.11781/sysydz199001076
Abstract(686) PDF-CN(341)
Abstract:
The experimental study on the maturations of evolution with DSC analysis is discussed.DSC is a renewed pyrolytic technique developed in recent years.As compared with DTA analysis,it has plenty of advantages,such as little interference and more sensitive and precise to the measurements under the thermal effecctive temperatures.Furthermore,the rate of △H1/△H2 by DSC analysis can be regarded as quantitative or semi-quantitative indicators for determining the maturations of kerogen evolution,especially for the high levels of kerogen evolution.
DEVELOPMENT AND APPLICATION OF JYC CARBONATE ANALYZER
Chen Zhengyu, Wu Dikang, Xue Guopan, Chen Denyyan
1990, 12(1): 82-86. doi: 10.11781/sysydz199001082
Abstract(590) PDF-CN(290)
Abstract:
In the light of problems existed in carbonate analysis and measurements,JYC carbonate Analyzer is designed and developed,based on the principles of the relationships between gas and pressure;pressure and electric signal conversion.The tests and determinations have proved its advantages with simplified operations,high speed and sensitivity,stable performance,and reliable results for the further analysis.
THE ANALYSIS ON MIDDLE MIOCENE FORAMINIFERAL FAUNA OF THE TARIM BASIN AND THEIR ECOLOGY, PROPERTY OF STRATIGRAPHIC OIL—SOURCE POTENTIAL
Qiu Songyu
1990, 12(1): 87-97. doi: 10.11781/sysydz199001087
Abstract(599) PDF-CN(316)
Abstract:
The middle Miocene sequences in the Tarim Basin are characterized by the clastic deposits comprising mainly of sandstone,siltstone-mudstone and mudstone with the appearance of variegated zones interspaced with grey and greyish green and brownish and reddish brown.Foraminiferal materials sourced mainly from the Kashi Depression and the Kuche Depression,are attributed to the Anjuan Formation and the Jidike Formation.The ammonia fauna of the middle Miocene sequences widespread over the two near E-W striking belts,i.e the Kashi Depression from Wuqia to Xiao’atushi,and the Kuche Depression from Kuche river to Kuele respectively.The Foraminiferal fauna are associated with Cyprideis,littoralis,Cyprinotus deformis,Limnocythere orgulata,Cyclocypris sp.,Eucypris sp.,etc and in addition,specif ic fossils of charophytes.This fauna would survive in the environment of brackish-fresh transitional water,which is favourable for oil generation.

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