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1989 Vol. 11, No. 3

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A VIEW ON TECTONICS OF PALEOZOIC BASINS OF THE YANGTZE REGION AND ITS IMPLICATION OF HYDROCARBONS
Zhang Yuchang, Qin Deyu, Ding Daogui, Lu Guoxing, Shan Xianglin, Xu Xuhui
1989, 11(3): 205-218. doi: 10.11781/sysydz198903205
Abstract(476) PDF-CN(356)
Abstract:
Regional investigation shows that the evolution of the Paleozoic basins on the Yangtze Craton experienced a primary extensional rifting in which smaller collage blocks with a great mobility and inhomogeneity were assembled during the end of middle Proterozoic and then the Paleozoic basins began to be disintegrated. The aulacogen in the north was of oceanicc rust and was later obliterated by the collision at the end of Silurian. Meanwhile rift-margin made up in the south was accreted with exotic collage blocks elavated. As a regional convergence, several cratonic depressions associated with occasional extensional rifting developed with the seawater invasion of Paleo-Tethys mainly from southwest in late Paleazoic. Some blocks separated from the southern craton during Carboniferous-Permian-late Triassic periods came into collision again.Consequently, the framework of Paleozoic basins were reformed as a result of intraplate deformation with crustal-stacking or delamination during Meso-Cenozoic, rifting to the collision of Paleo-Neo-Tethys and the effect of the Pacific Plate. As mentioned aboved, it is suggested that Paleozoic hydrocarbons were mainly generated from the present mountain belt, where the content of organic carbon is much more abundant than that carbonate platform. The subsidence in early Paleozoic perhaps played an important role in generation and migration of hydrocarbons before Caledonian. The napping may be favourable to the conservation of the generated hydrocarbons and the perspecting area could included some favourable belts such as the Foothills of Longmen and Daba mountains, and nor-thern fringe of the Xiafung-Jiannan Hill are worthy to be explored furthermore.
STUDY OF SOURCE ROCKS IN AND AROUND NORTH TARIM UPLIFT WITH THE GEOLOGICAL THEORY OF HYDROCARBON BEARING BASIN
Gan Kewen
1989, 11(3): 219-227. doi: 10.11781/sysydz198903219
Abstract(488) PDF-CN(260)
Abstract:
There have been different opinions on source rocks since the oil discovery of Shacan No.2 well in north Tarim. The author considers that the problem can never be solved if different analytical indices are taken for a single crude oil. With the geological concept of hydrocarbon bearing basin, considering the evolution condition of the basin, i.e.sufficient hydrocarbons from tne source rocks, and favourable conditions of migration and accumulation, the source rocks is suggested to be of Mesozoic age rather than Pale-aozoic, howevei. Different ideas of source rock lead to different stragic decisions and arrangements and thereby different results of exploration.
ON THE ACCUMULATION AMOUNT
Sheng Zhiwei
1989, 11(3): 228-233. doi: 10.11781/sysydz198903228
Abstract(434) PDF-CN(304)
Abstract:
The concept of the accumulation amount is briefly introduced. Attention is paid to discussing three different views on accumulation coefficient. It is considered that the coefficient should be equivalent to the percentage of the accumulation amount of oil and gas relative to the volume of primary migration in source beds. Furthermore, the relation between the coefficient of accumulation and that of hydrocarbon expulsion is discussed. Macroscopically the former is much larger than the latter. The mean value for the accumulation coefficient of oil and gas is about 50%; and that of hydrocarbon expulsion, generally ranges from 10-20%. Finally, the collocation system of a source-reservoir pair should be regarded as an unit in analogue computation. Such consideration should be applied in the research of resources estimation.
FORMATIVE TYPES OF LITHOLOGICAL GAS POOLS IN CARBONIFEROUS CARBONATES IN EASTERN SICHUAN
Chen Zongqing
1989, 11(3): 234-240. doi: 10.11781/sysydz198903234
Abstract(476) PDF-CN(313)
Abstract:
The relations among the lithology, rock fades and porosity, as well as the factors controlling the formation of lithological traps in Huanglong Formation, Carboniferous system, Eastern Sichuan were analysed. Three types of lithological traps of carbonates in the area were suggested, i.e. sedimentary facies trap, lithological updip trap and composite lithological trap. The intensely folded and the areas with complex structures are favourable for the formation of composite lithological traps.
DISCUSSION ON OCCURENCE AND ABUNDANCE OF ORGANIC CARBON OF THE ORDOVICIAN--SILURIAN DARK CLAYSTONE, SOUTHERN ANHUI
Yang Changgeng, Zhu Peijun, Ge Wanxing
1989, 11(3): 241-244. doi: 10.11781/sysydz198903241
Abstract(503) PDF-CN(332)
Abstract:
In order to properly evaluate the oil potential in overmature areas, microscopic observations are made on Ordovician-Silurian dark claystones. It is considered that there are secondary asphalts in overmature claystones. The content of asphalts should be excluded from the analytical data of organic carbon. The rocks with organic carbon content ranging from 0.4-1.0% are good source rocks of basinal facies, and those below 0.4% are poor source rocks of continental shelf facies.
APPROACH ON THE METHOD FOR RESTORATION OF ORIGINAL SEDIMENTARY BOUNDARIES OF THE CRETACEOUS DEFORMED BASIN IN JIOUXI AREA
Wan JingPin, Ma Lixiang, Zhou ZongLiang
1989, 11(3): 245-249. doi: 10.11781/sysydz198903245
Abstract(542) PDF-CN(288)
Abstract:
On the basis of the principles of sedimentology, using the data of field measurements on the diameters of gravels of different facies in modern diluvial fans in the areas of Changma and Kuantai on Hexi Corridor, and the statistical data for the trend of thickness variation of sandy conglomerates in Jixi area versus facies belts, the exponential equations for the relations between mean diameter of gravels and the thickness of sandy conglomerates with transportation distanceare etablished. The two equations and the trend of the strike of isopaches of the Cretaceous were applied to restoring the original sedimentary boundaries of the Cretaceous deformed basin in northern margin of Qilian Mountain, Jixiarea.
DISCUSSION ON THE GROWTH INDEX OF FAULT
Zhao Mengwei
1989, 11(3): 250-254. doi: 10.11781/sysydz198903250
Abstract(783) PDF-CN(393)
Abstract:
The growth index of a fault is related not only to its speed of activity but also to the deposition rate which has been neglected foralong time. The duration of sedimentation has to be established in order to evaluate the sedi-mentary rate. Hower, the speed of activity ofafault can be directly abtained from the duration of sedimentation and reflects quantitatively the activity intensity of the fault, thus the terminology of the growth index of fault is practically meaningless.
DETERMINATIONS OF ARITHMETICALLY AVERAGED MOLECULAR WEIGHT OF HEAVY CRUDE OIL AND ITS COMPONENTS AND THEIR GEOCHEMICAL SIGNIFICANCE
Tang Liping, Yang Zhiqiong
1989, 11(3): 255-263. doi: 10.11781/sysydz198903255
Abstract(675) PDF-CN(383)
Abstract:
The arithmetically averaged melocular weights of certain heavy crude oils of continental facies and their components were determined using VPO method, which provided important parameters of chemical structure for hydrocarbons. The results show that the arithmetically averaged melocular weights of continental facies heavy crude oils in China range approximately from 480.1-686.2. The arithmetically averaged melocular weights of their components are as follows. 385.2-398.6 for saturated hydrocarbons; 362.5-464.7 for aromatics; 755.7-1321.7 for resin and 856.7-4043 for asp-haltene. The melocular weights are closely dependent on the maturity specific density and group composition of crude oils.
STUDY OF CONTINUOUS EXTRACTION OF BITUMEN A WITH CHLOROFORM
Yu Zhiqing
1989, 11(3): 264-268. doi: 10.11781/sysydz198903264
Abstract(533) PDF-CN(244)
Abstract:
In view of problems with Soxhlet extraction for soluble organic matter in rocks, improvements were made on Soxhlet extractors. The discontinuous extraction of Soxhlet method on rocks with solvent is changed into continuous extraction of rocks with solvent. Experiments show that the extracted amounts of claystones, limestones and shales of continuous method for 8hrs were comparable to those of Soxhlet method for 72hrs. The extracted amounts of coal samples with continuous extraction for 24 hours was edual to that of Soxhlet extraction of 100 hours. Therefore the extractive efficiency is increased by 4-9 times. Moreover the data of group analysis show better continuity and comparability than those of Soxhlet methods.
DIRECT MEASUREMENT OF OIL IMMERION REFLECTANCE ON MACERALS
Liu Congbao
1989, 11(3): 269-272. doi: 10.11781/sysydz198903269
Abstract(491) PDF-CN(208)
Abstract:
Oil immersion reflectance of macerals is measured, home and abroad, all alike, with immersion oil at Ne23=1.5180; otherwise the values abtained must be corrected, which is subject to complicate procedures and time-consuming. Based on the relationships of working electric current and voltage with the reflectance, a method with which the reflectance of macerals is measured at any temperature is proposed. The principles and measuring procedures of the method are presented in detail.
WATER SATURATION OF THE PAYS IN MENGGULIN BRECCIA OF ERLIAN BASIN
Yu Jiaren
1989, 11(3): 273-276. doi: 10.11781/sysydz198903273
Abstract(512) PDF-CN(321)
Abstract:
With the analytical data on rock samples recovered by drilling mud with oil matrix, water saturation of the pays in Menggulin Breccia was evaluated. Volcanic breccia is highly water-saturated due to its fine pore geometry and poor physical properties; while gravelly sandstones and sandy conglomerates are low water-saturated with relatively high oil saturation.
APPLICATION OF LIGHT PEN IMAGE ANALYSIS SYSTEM WITH MICRO-COMPUTER WJGT SERIES TO MEASUREMENTS OF PARTICLE SIZES ON THIN SECTIONS
You Xiuling
1989, 11(3): 277-283. doi: 10.11781/sysydz198903277
Abstract(464) PDF-CN(210)
Abstract:
Since the establishment of light pen-image analysing system, the per-sonnel involved in rock and mineral analysis have been extricated from large amount of statistical and complex computation, and the efficiency and quality of the measurement of particle size have been greatly improved. In order to extend the range of application of the method, and to provide more data for petrofabric, the following problems a e discussed. Operational principles of the instrument; Noticeable problems during testing; Usage of the program of line-section percentage; Case study of the application.
A WAY TO INCREASE THE RELIABILITY OF ESTIMATION
Hu Guiming
1989, 11(3): 284-290. doi: 10.11781/sysydz198903284
Abstract(1011) PDF-CN(236)
Abstract:
One of the basic problems of quantification in geoscience is uncertainty. Based on the concept of probability, the possible value for a variable is pro-posed with the estimation of a single value replaced by probability distribution. The reliability of estimating parameters is further discussed. There are various methods for estimating the reliability of a parameter with probability distribution. Applying the mechanism of feedback, the pro-posed method of feedback combines organically the precision of mathematic computation and the human judgement. Sharp PC-1500 computer is used as the working computer for the study.
SYMBIOSIS ON MIXOBIOSIS
He Ruchang
1989, 11(3): 291-300. doi: 10.11781/sysydz198903291
Abstract(410) PDF-CN(205)
Abstract:
The paper is the sequel of the article of "Mixobiosis".The author attempts to discuss the age of Shanxi Formation with the data of sporopollen from the two wells (No.32 and No.29) in Guan Zigou region, Inner Monglia, and continue the discussion on the problems such as index fossils, annihilation of organisms and the theory of mixo-evolution. The significance of mixobiosis in delimitating stratigraphic boundaries is pointed out.

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