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1994 Vol. 16, No. 4

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A REVIEW ON THE TERMINOLOGY OF A-SUBDUCTION IN THE GEOTECTONICS OF CHINA
Luo Zhili
1994, 16(4): 317-324. doi: 10.11781/sysydz199404317
Abstract(738) PDF-CN(341)
Abstract:
The terminology of A-subduction is rather confusion in the geotectonics of Chinathough it is popularly used by Chinese geologists for a long period.After making reviewson the various definitions and expressions of this teetonic term,the author of this paperput forward the conception of C-subduction(Chinese-type subduction)with eight geological characters which have been compared with those of A-subduction. Consequently,it issuggested that three B,A,and C subductions should be expressed different orogenic stagesof plate subduction, continental collision and intracontinental sequence, respectively.
KINETIC MODELLING ON THE FORMATION AND EVOLUTION OF THE QINTONG DEPRESSION IN NORTHERN JIANGSU
Shi Zejin, Zhang Yuchang, Shi Yangshen, Sun Yan
1994, 16(4): 325-333. doi: 10.11781/sysydz199404325
Abstract(1235) PDF-CN(266)
Abstract:
Kinetic study on the formation and evolution of a basin is one of key links of basiningsimulation,it is also momentous significant for the research of trap's formation and evolution,and type and size of oil/gas traps. The deformation of hanging walls may be well described by the field of velocity vector and the time it occurred. Through the establishmentof kinetic mathematical model,the profiling and compaction corrections have been completed in this paper. The modelling reveals the formation and evolution of the Qintong Depression and synsedimentary process,as well as the amount of faulting extensions in various stages.Thereafter,the evolutional characteristics of the Qintong Depression have beenanalvsed in this paper.According to three modelling profiles,the authors have studied dif-ferent evolutional features in the west middle and east sections of the Depression.
DETERMINATION OF DIVERGENT DIRECTION OF BILATERAL BLOCKS OF GRABENS
Xu Junyuan
1994, 16(4): 334-338. doi: 10.11781/sysydz199404334
Abstract(633) PDF-CN(265)
Abstract:
A new and simple technique is proposed for determination of divergent directions ofbilateral blocks of grabens using the structural geometry data. Futhermore, by applyingthis technique,the divergent directions of the graben in Liaodong Bay Basin is determinedas NNW6°and it is comfirmed by those(NNW5°)of Yilan-Yishu grabens at the north-ern extension of Laodong Bay Basin, which is determined by field investigation and the inversion stress tensor of microstructures.
A STUDY OF SEDIMENTARY CHARACTERISTICS AND PETROLLFEROUSNESS IN THE JURASSICSEQUENCES OF THE FAULT REGION, THE SE TARIM BASIN
Chen Ronglin, Zhu Hongfa, Chen Yao, Luo Yueming, Liu Fangjun
1994, 16(4): 339-344. doi: 10.11781/sysydz199404339
Abstract(563) PDF-CN(327)
Abstract:
Ten oil-bearing sandstone beds with a thickness up to 103m were discovered in thesections of the Jurassic sequences,Zhenggeleke,Qiemo County,Xinjiang. This is the firstdiscovery in the region of the SE Tarim Basin,It is suggested that the petroleum source inthe oil bearing sandstones should be attributed to shallow marine source rocks of the un-derlying Paleozoic sequerices and the reservoir should be composed of Middle Jurassic dilu-vial-fluvial sand body,while the upper Jurassic dark mudstone with a thickness of 80mact as its immediate cap bed.Since this kind of source, reservoir and seal assemblege foroil/gas pools is very popular in the region,this discovery provides a guideline to the petro-liferous evaluation and the selection of exploratory prespects in this region.
ON GEOCHEMICAL CHARACTERISTICS OF THE JURASSIC OIL-BEARING SANDSTONES IN THE FAULT DEPRESSION, THE SE TARIM BASIN
Xu Xiang, Hu Min, Zhang Qu, Bai Senshu
1994, 16(4): 345-353. doi: 10.11781/sysydz199404345
Abstract(645) PDF-CN(302)
Abstract:
In this paper,the studies of geochemical characteristics on both the Jurassic sourcerocks and oil-bearing sandstones in the fault depression of the southeast Tarim basin havebeen carried out.It is suggested that the kerogens of the Jurassic source rocks mainly comefrom nonmarine higher plants with low evolutionary level while those of the Jurassic oil-bearing sandstones derived from lower hydrobios with high maturity of crude oil. Therefore,it is revealed the source rocks of the Jurassic oil-bearing sandstones should be attributed to Paleozoic marine source rocks.
CEOCHEMICAL CHARACTERISTICS AND GENETIC ANALYSIS OF HEAVY VISCOUS OIL IN THE LENGDONG LEIJIA AREA
Fang Chaoliang, Zhang Yiwei, Zhang Zhihuan
1994, 16(4): 354-365. doi: 10.11781/sysydz199404354
Abstract(868) PDF-CN(308)
Abstract:
Crude oil of the unit Ⅰ,Ⅱ and Ⅲ of the Shahejie Formation in the Lengdong-Leijiaarea is dominated by heavy viscous oil The study of the heavy viscous oil plays an important role in establishing a fluid characteristic distribution and geochemical model of thearea. In this paper, various experimental data from the analysis of the family components,gas chromatography(GC)and stable carbon isotope of crude oil,and the gas chromatogra-phy-mass spectrometry(GC-MS)of saturated and aromatic hydrocarbons is used to studycomprehensively the geochemical characteristics of heavy viscotis oil in the area. Combining vvith the regional geology and geochemical condition of the area,the oil sotirce condition and genesis of heavy viscous oil are also discussed.The restilt provides an importantgeological basis for the exploration and development of heavy viscous oil pools in the area.
STUDY ON BIOMARKERS IN THE MARINE SEQUENCES OF THE MID-YANGTZ AREA
Tang Feilong
1994, 16(4): 366-373. doi: 10.11781/sysydz199404366
Abstract(562) PDF-CN(245)
Abstract:
In this paper,the study is mainly focused on biomarkers in the marine esquences ofthe Mid-Yangtz area. At present,the determined six types of biomarkers are sterane,di-cyclosesquiterpene,tricycloditerpene,tetracyclene, horane of a pentacyclotriterpene kind and γ-waxane. By comprehensive analysis on the characters of their composition distribution and evolution of configuration,the biogenic environment of organic matter.the kerogen types and the evolution levels in the marine sequences of local area could be clearlyoutlined.This study has an important reference value for better understanding of the organic geochemical characters of the marine sequences and the further geochemical researchin the area.
APPLYING EFFECTS OF SOIL ELECTRICCONDUCTIVITY IN SEARCHING FOR OIL AND GAS FIELDS
Jia Guoxiang
1994, 16(4): 374-379. doi: 10.11781/sysydz199404374
Abstract(777) PDF-CN(285)
Abstract:
Using electric conductivity(ks)in searching for oil and gas fields(pools)is mainlybased on the magneto-electric current of oxido-reduction happened on the upper position ofoil and gas fields(pools)and oxidation column formed by oil-field wateracting on the bothsides of the oil and gas fields(pools).With the metal ions in the oxidation coltimn diffusing and migrating upward, part of cations in the side layer would enter the column andpromotes the conductivity(ks)of the column. Under such a long-term geochemical processit would bring about ring-abnormality of K,around the peripheral surface of the oil and gasfields(pools). So high background area in the inner side of ring-abnormality indicates theeffective area of the distribution of oil and gas fields(pools).
ON AROMATIC STRUCTURES OF DIFFERENT MACERALS AND THEIR FLUORESCING MECHANISM
Qiu Nansheng, Jin Kuili
1994, 16(4): 380-383. doi: 10.11781/sysydz199404380
Abstract(667) PDF-CN(238)
Abstract:
On the basis of GC-MS analysis and laser-induced fluorescence spectrum analysis onthe same coal rank with different macerals and combining with molecular fluorescence theory,the fluorescing mechanism of aromatic hydrocarbons with different macerals is approached in this paper under the condition of dye laser as the light sources of excitation.
NEW PARAMETERS OF MERCURY-INJECTION CAPILLARY PRESSURE CURVE OF SANDSTONE IN RESERVOIREVALUATION AND THEIR GEOLOGICAL SIGNIFICANCE
Zhang Wenda, Zu Panliang, Liang Shu
1994, 16(4): 384-388. doi: 10.11781/sysydz199404384
Abstract(719) PDF-CN(535)
Abstract:
In this paper,both new parameters of the mercury-injecting velocity and the critical entry pressure for the mercury-injection capillary pressure curve of sandstone are introduced. These two new parameters have a crucial significance in the reservoir evaluation and the etimation of oil/gas reserves.
CHARACTERISTICS OF THE RESERVOIR SAND-BODY SEDIMENTATION AND PORE-EVOLUTION IN THE 1ST. SECTION OF THE KAPUSHALIANG GR, YAKELA AREA OF THE TARIM BASIN
Zhang Ximing
1994, 16(4): 389-396. doi: 10.11781/sysydz199404389
Abstract(585) PDF-CN(318)
Abstract:
No. 1 Section of the Kapushaliang Group is dominated by the sedimentary sequencesof fan delta, The microfacies of gas reqervoir sand body mainly consists of channel bar andsubaquatic split-flow channel and they should be attributed to braided river plain and sub-aqtiatic braided plain stibfacics,respectively,They are vertically charactcrized by multiplesuperimposition and latterally by frequent migration,in occurrence of well-sequentialsheet-geometry, Du ring the evolution on of porous reservoir,the katogene by diagenesis includes compaction,pressure solution, cementation and replacement of carbonate and quartzsccondary enlargement while the construction consists of remagenesis and deep dissolution.The reservoir spaces of thc sandstones are dominated by secondary solution openingsand percolation paths are pore throats associated with fractures,briiiging about a of thereservoir porous type.
ON TOMOGRAPHY APPLYING IN THE THEKMAL CONDUCTIVITY VARIATION OF SEDIMENTARY FORMATIONS
Xue Aimin, Jiao lingxiu
1994, 16(4): 397-402. doi: 10.11781/sysydz199404397
Abstract(1069) PDF-CN(242)
Abstract:
As the thermal conductivity of sedimentary formations is stable throughout the periodof sedimentary evoltition,it can be regarded as a constant. With a premise of invariable offluid property,the thermal conductivity of cemented rocks changes only with the variationof porosity and temperature,By the comptiter modellings on thermal history and sedimentary history,the thermal conductivity of rocks in different times can be inversed and imaged obtaining the images of thermal conductivity in varing times and depths, In this paper, the authors discuss the imaging method of thermal conductivity according to the fission track of apatite and the data of vitrinite reflectivity and suggest a theoretical model ofimaging using vitrinite reflectivity.
MEASURES ON RESERVOIR KESERVOIPTION CORRESPONDING WITH THE GRADUATION OF GEOLOGICAL RESERVOIR MODELS
Yao Guangqing, Ma Zheng, Zhao Yanchao
1994, 16(4): 403-408. doi: 10.11781/sysydz199404403
Abstract(722) PDF-CN(382)
Abstract:
In this paper,the authors propose eight grades for reservoir descriptions correspond-ing with different reservior models as the following scales:Ⅵ. Basin,Ⅴ.Oil field,Ⅳ.Sandstone formation,Ⅲ.Sand bed,Ⅱ.Sand body,Ⅰ.Bedding,-Ⅰ.Millimeter and-Ⅱ.Micron. The reservoir models with different grades may reflect the reservoir heterogeneityat different levels.Therefore,the description can be applied in varions scale of reservoirsby such measurements.
NUMERICA LMODELLING ON THE LENGTH DISTRIBUTIONS OF APATITE FISSION-TRACKS AND ITS APPLICATIONS IN GEOLOGY
Zhao Licheng, Feng Shi, Wang Shicheng, Kang Tiesheng
1994, 16(4): 409-416. doi: 10.11781/sysydz199404409
Abstract(1138) PDF-CN(235)
Abstract:
In tbe paper,the fan model from Australia is adopted as a quantitative model of apatite fission-track annealing. The authors modelled the length distribution of apatite fission-tracks along certain temperature-time paths on the basis of fission-track annealing atvariable temperatures using the equivalent time principle;the length distribution of a series of fossion-tracks produced at a sufficient short time being approached by a Qatiss den-sity function;and the superimposed length distributions of fission-tracks prodticed successively throughrout geohistory.Some qualitatively discriminant models,herein for theanalysis of geothermal history of sedimentary basins,are presented by numerical modellings on the distributions of apatite fission-tracks along several geothermal temperaturepaths and their correlations. It is proposed that a further modelling on the geohistory andgeothermal history sedimentary basins can be achieved with such a discriminant model andfinanlly,the numerical modelling is applied for the thermal history and stratigraphic de-nudation of Qiou No.3 well.

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