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1994 Vol. 16, No. 3

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THE STUDY ON THE ORGANIC GEOCHEMISTRY OF ISOMETAMORPHIC COAL AND VITRINITE──ROCK-EVAL PYROLYTIC ANALYSES
Zhao Shiqing, Li Xianqing
1994, 16(3): 199-208. doi: 10.11781/sysydz199403199
Abstract(638) PDF-CN(283)
Abstract:
In this paper,detailed Rock-Eval pyrolyses have been carried out on the vitrinite and composition of various reductional-type coals(i.e. coal facies Ⅱ and Ⅲ)from the Northern Jiangsu and Southern Shandong provinces of the southern part of North China,and their geochemical features are also studied combining with anthracological identification and the measurement of fluorescent parameters. The above studies suggest the following three comments:1)the pyrolytic analysis could be an effective means for the potential evaluation on coal-derived hydrocarbon,2)the type of vitrinite should play a signigicant influence on the hydrocarbon poteintial derived from humic coal,in which rich hydrogen-bearing vitrinites are the major contributors to hydrocarbon generation,3) exinoid compositions should also be the contributor to the hydrocarbon generation from humic coal, and 4)the rich hydrocarbon-bearing coal with coal facies Ⅱ and Ⅲ in the study areas should be a certain type of humic coal which essentially consists of fluorescence vitrinite and exinoid compositions.
ON SOME THEORETICAL AND METHODOLOGICAL TOPICS OF BIOGENIC GAS SYUDIES
Chen Ying, Dai Jinxing, Qi Houfa
1994, 16(3): 209-219. doi: 10.11781/sysydz199403209
Abstract(570) PDF-CN(596)
Abstract:
As viewed with some theoretical and methodological topics of biogenic gas studies at home and abroad,the authors suggest that the formation of biogenic gases in the nature(by the reduiction of CO2 or methane formed by the fermentation of acetic acid)should be dominated by combining factors,such as sedimentary environment,burial depth,climate and geological ages etc.,and the criteria of δ13C less than-55% and less than 0.5% could be reasoi1able indexes for the identification of biogenic gases.As for the analysis,subdivision and evaluation on the types of organic matter of biogenic gas source rocks,the authors of this paper donot believe that the traditional concept and method used in petroleum genlogical studies can continue to be fully used.
A NEW TYPE OF SHALLOW NATURAL GAS WITH BROAD EXPLORATION PROSPECT──THEREGENERATED BIOGENIC GAS FROM OIL RESERVOIR AND COAL SEAMS BY THE DEGRADATON OF ANAERODIC BACTERIA
Li Zanhao
1994, 16(3): 220-229. doi: 10.11781/sysydz199403220
Abstract(810) PDF-CN(323)
Abstract:
Tbe biogenous natural gas of regenerated type is a widespread shallow natural gas which is a regenerated energy sotirce by the degradation of the anaerobic bacteria(mainly-methanegenerated bacteria)from shallow oil reservoir and coal seams under a reduction condition. Such an understanding breaks through the conception that biogenic natural gas could only be discovered in shallow unmatured players, and expands the exploration field-into oil-bearing and coal-bearing basins and even some salt-bearing and alkali-bearing basins,which are attributed to shallow-buried and thermal mature type. So this kind of shallow natural gas would be a significaiit prospecting and can probably become a main resource type of biogenic gas of our country in the future.
A PRELIMINARY APPROACH TO THEMAIN FOKMATTIVE CONDITIONS OF LARGE AND MIDDLE SIZE OF GAS FIELDS IN COAL-BEARING SYSTEMS
Wu Yaoxing
1994, 16(3): 230-233. doi: 10.11781/sysydz199403230
Abstract(534) PDF-CN(256)
Abstract:
With a viewpoint of dynamic equilibrium,a preliminary approach has been made to the key factors which control over the formation of large and middle size of gas fields in coal-bearing systems on the basis of the studies on the typical coal-derived gas fields at home and abroad.It is proposed that source rocks, accumulation and preservation of natural gas should be essential conditions.
ON THE CHARACTERISTICS OF TECTONIC EVOLUTION OF SE CHINA CONTINENTAL MARGIN
Liao Zongting, Zhou Zuyi, Chen HuanJiang, Jing Xueli
1994, 16(3): 234-242. doi: 10.11781/sysydz199403234
Abstract(657) PDF-CN(383)
Abstract:
As viewed from the tectonic evolution of the SE China continental margin as a whole,it has experienced a long,continueous and successive developing process though the variation of geological evolution is characterized by stages, During the pre-Indosinian (or late Variscian)of the ancient global tectonic stage,the tectonics of the continental margin was characterized by continental growth or accretion in the mode of ductkile creeping or variotis terrane collisions at different times. The lndosinian diktygenesis broiight ab0ut the trans-formation of tectonic regimes,i.e, from the accient global tectoiiic regime into the new global tectonic regime of plate tectonics,indicated by the generation,development and stib-duction of the Tethvan and Pacific plates. Since the tectonic deformation and the stJperim-position of the later tectonics on those of the former continued to go on by collision after convergence or interblock squeezing reactivated along pre-collisional belts.This is indeed a type of thin-crusted collision tectonics that occurred in the new global tectonic stage of plate tectonic regime. However,the tectoiiics of the SE China continental margin differs from both of the Alps and S.Appaliachian types since the interblock collision followed by continental squeezing and various derived terrane collision took place at different times and in different stvles. Moreover,it differs also from the Germano and Cordileran types of oro-genic tectonics siiice the interblock squeezing was accompaiiied by severe deformation,a profuse of metamorphism,magmatism,migmatization and magma intrusion,as well as the various highly heterogeneous terranes which welt to each other in different times and stvles. Therefore,it is concluded that the tectonics and their evolution of the SE China con-tinental margin should have its unique geological characteristics.
A WAY TO FIND OIL IN TARIM BASIN BY STRUCTURAL ANALYSIS OF CHINA SEDIMENTARY BASINS
Yang Kesheng
1994, 16(3): 243-249. doi: 10.11781/sysydz199403243
Abstract(831) PDF-CN(273)
Abstract:
In a vievv of exploratory practice,it is provedthat generally the midaestage of a half-graben evolution should be considered as the peak oil generation,while the developing period of platform strutural layer in a petroliferous basin as the optimuln stage of gas generation,Tarim basin is a typical petroliferous basin with a multi-layered structure consisted of platform,downfault and depression,the developing stage of the platform structural layer is the peak generation, but a higher ratio of condensate oil in the basin than those in he Sichuan andordos Bsans,due to rather lower value of haet flow for the Tarim Basini and the developing stage of the half-graben is the peak oil generation, In vievv of the abovementioned geological pattern,the author suggests that a new seismic method(VSP)be applied to carry out seismic survey in the Mz-Efault-depressions of the Kuche and the SW Tarim in order to seek new structural highs for future petroleum exploration in the basin.
INTRACRUSTAL DETACHMENT IN THESOUTHERN MARGIN OF THE NORTH CHINA PLATE AND ITS INFLUENCE OVER THE FORMATION OF OVERTHRUST SYSTEM IN NORTHRN DABIESHAN
Song Zitang
1994, 16(3): 250-255. doi: 10.11781/sysydz199403250
Abstract(606) PDF-CN(257)
Abstract:
Data of telluric electromagnetic sounding illustrate that there is a sliding plane with highly electric conductivity developed at the depth of 3～5km in the southern margin of the north China plate,In accordance with the directional structures of mylonites,the occurrence of major fold axis plane and sense of tectonic windows and napping emplacement in the Dabie uplifting area,it is suggested a large-scale of southward detachment should have developed along the upper crust of southern margin of the north China plate since the late Hercynian period.Till Yanshan period, this movement was blocked by severe uplifting of the Dabieshan,resulted in the development of northward Dabieshan overthrust system.
A PRELIMILARY STUDY ON TdEG ENESES OF PETROLIFEROUS DIFFRENCE IN THE ORDSVICIAN CARBONATE RESERVOIR, EASTERNORDOS BASIN
Qin Jianxiong, Liu Xiufeng, Zeng Yongfu
1994, 16(3): 256-266. doi: 10.11781/sysydz199403256
Abstract(839) PDF-CN(306)
Abstract:
The petroliferous diffence of the Lower Ordovician reservoir rocks in the eastern Or-dos Basin is resuIted from the non-uniformly geological conditions for the reservoir rocks,which is an interaction of paleo-elevation of the basement structure,and depression,lith-facies and paleogeography,diageneLsis and paleokarstification,among those factors,paleo-elevation of the basement and depression are the foundation,lithfacies is the geological condition,diagenesi is the key to geological process, and paleokarstification is a decisive factor.
ON THE RELATIONSHIP BETWEEN THE OXYGEN AND CARBON ISOTOPES AND THE DIAGENESES OF ORDOVICIAN CARBONATE ROCKS IN THE YANGTAC AREA
Yang Changgeng
1994, 16(3): 267-273. doi: 10.11781/sysydz199403267
Abstract(612) PDF-CN(434)
Abstract:
Through the regressional calculation and simulation on the δ18O of micritic limestone and Rmaxo of associated argillous asphaltum from the 11 Ordovician sections in the YangtzeArea,it is suggested that the oxygen isotopic exchanges of the micritic limestones shouldbe dominated by buried paleo-geotemperature, Based on the above analysis,the author ofthis paper discusses on the oxygen and carbon isotopic characteristics of the 6 kinds of diageneses with different diagenetic environments in the Ordovician carbonate rocks of the 6section points of the Yangtze carbonate platform. Furthermore,the author suggests thegeological significance of the discussions in the assessment on the maturity of organic matter and oil/gas accumulation, preservation,and migration.
DIAGENETICFACIES──A NE WAPPROACH TO THE PKEDICTION OF RESERVOIT ROCKS
Chen Yanhua, Liu Ying
1994, 16(3): 274-281. doi: 10.11781/sysydz199403274
Abstract(678) PDF-CN(342)
Abstract:
Reservoir distribution and the heterogeneity within reservoir rocks are dominated by varying diagenesis,Up this knowledge allows studies on the quantltative distribution of the effective reservoir rocks with respect to their geologic process and clarification of the diagenetic facies with various porosities and permeabilities,Futhermore,the study is ex-tended from a point to an overall 3-D quantitative analysis by establishing discriminant correlation models between diagenesis and sedimentology,seismology and well-logging.Eventually the paper suggests a new approach to estimating reservoir capacity by diagenetic facies-pore volume.
INFLUENCEOF BURIED DEPTH ON THE PROPERTIES OF REGIONAL COVERING STRATA WITH AN EXPERIMENTAL ANALYSIS OF TRIAXIAL RESISTANCE TO SHEARING AND COMPRESSING
Chen Jingren, Peng Xiumei
1994, 16(3): 282-289. doi: 10.11781/sysydz199403282
Abstract(604) PDF-CN(257)
Abstract:
The experimental analysis of triaxial resistance to shearing and compressing on rocksshow that yleld limit and ultimate tensile strength would increase regularly along with theincrease of design confining pressure. Futhermore,in a case of same compressional force. the deeper the buried depth is for the coveriiig strata, the higher resistance to the shearing and compression strength would be for the rocks, and the less the fractures would be generated.With the combination of case studies of practical explorations, the authors setquantitative standards to estimate regional covering strata, based on the relationship of vertically hydro-geologic zoi1ing with the buried depth of a covering strata.
MODELLING EXPERIMENTS ON THE GENERATION AND MIGRATION OF COAL-DERIVED HYDROCARBONS：I. THE CHARACTERISTICS OF GASEOUS AND LIQUID HYDROCARBON PRODUCTS AND THEIR EVOLUTIONS
Lu Shuanfang, Zhao Xigu, Huang Difan, Wang Ziwen, Liu Xiaoyan
1994, 16(3): 290-302. doi: 10.11781/sysydz199403290
Abstract(630) PDF-CN(368)
Abstract:
In this paper,the amount and compositions of the gaseous and liquid hydrocarbon products and their evolutionary regularities are studied on the bases of hydrocarbon generation and expulsion modellings on two brown coal samples simultaneously. Combined with recently documented achievements,the authors have proved the evident influence of reactive pressure upon the amount and compositions of gaseous and liquid hydrocarbon products. At the same time,the authors discuss on the capacity of oil generation and expulsion derived from brown coal,the mechanism and effects of hydrocarbon migration,and hydrocarbon maturation and evolution.
ON THE DETERMINATION OF THE KINETIC PARAMETERS OF SOURCE ROCKS IN THE HEFEI BASIN
Liao Jingjuan, Xue Aimin
1994, 16(3): 303-307. doi: 10.11781/sysydz199403303
Abstract(615) PDF-CN(252)
Abstract:
In this paper,three source rock samples are sampled from the Cretaceous Zhuxiang and Xiangdaopu Frs. and the Tertiary Dingyuan Fr. of the Hefei basin,and the pyrolytic analyses have been carried out with the heating rates of 20℃/min, 30℃/min,40℃/min,and 50℃/min respectively in an open experimental system. This causes the determination of the relationship between the generating rates of accumulated hydrocarbons and the temperatures of various souece rock samples. Furthermore, it can ascertain the kinetic parameters of various samples of different geological ages in the Hefei basin.
ON THE LOWER PERMIAN SPOROPOLLEN ASSEMBLAGE AND PETROLEUM SIGNIFICANCE INTHE SOUTHERN TANGSHAN, HEBEI PROVINCE
Yang Xueying
1994, 16(3): 308-312. doi: 10.11781/sysydz199403308
Abstract(780) PDF-CN(228)
Abstract:
A plenty of sporopllen fossils been discovered in the Shanxi Fr and the lower section of the Shhezi Fr. within the Lower Permian System in the Southem Tangshan, Accoring to the sporopollencharacters from bottom to top, the sporopollen assemblage can be divided into two subassemblages as theLaevigatosporites-Gul isporitespal midites and the Laevigatosporites-Florinites-Disaccites. The geological age of the first subassemblage is attributed to the Shanxi Fr.,while that of the second one should be theShihezi Fr. of the Lower Carboniferous System. The correlation of the sporopollen assemblages with thoseof same ages in our country are discussed in this paper.

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