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2000 Vol. 22, No. 1

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STUDY OF THE GEOCHEMICAL FIELD FOR HYDROCARBON FORMATION
LIU Wen-hui
2000, 22(1): 3-8. doi: 10.11781/sysydz200001003
Abstract(663) PDF-CN(534)
Abstract:
Base on the fundamental concept of the field theory,this paper states the characteristics of the geochemical field in brief,discusses emphatically the evolution and characteristics of the geochemical field during hydrocarbon formation,and probes into the coupling actions between the organic geochemical field and other geologic fields(such as the geothermal field,the stress field,etc.)during hydrocarbon formation.It is considered that the mutual matching of different fields is the key factor for the formation of petroleum accumulation.
AN EXPERIMENTAL STUDY OF PROGRAM PYROLYTIC MODELING ON SECONDARY HYDROCARBON GENERATION OF COALS
TANG Da-zhen, WANG Ji-liu, LIN Shan-yuan, YANG Li-guo
2000, 22(1): 9-15. doi: 10.11781/sysydz200001009
Abstract(606) PDF-CN(562)
Abstract:
By means of program pyrolytic modeling,major parameters on the secondary hydrocarbon generation of coal have been described in detail,for instance,instantaneous hydrocarbon production,cumulating hydrocarbon production,cumulating amount of hydrocarbon generation,cumulating degradability and residual carbon.According to the original coalification degree of the daughter samples,the peak temperature of secondary pyrolysis changed in different styles such as lag,advance and fixation.To the coal at the metaphase pyrolytic stage,the reactive temperature zone of hydrocarbon generation extends to the lower temperature direction and the secondary hydrocarbon generation starts earlier due to the existence of weak chemical bond and bituminizied substance.To the coals at the early and terminal pyrolytic stage,activation of secondary hydrocarbon generation needs equivalent or stronger reactive conditions than the past since the hydrocarbon generation is mainly depend on the pyrolysis of principal part of the coal structure.The secondary hydrocarbon generating potential of coals is limited by primary evolution degree.Based on the stage characteristic of secondary hydrocarbon generation of coal and the self generating and self reser ving specialties of coalbed methane,the superimposed metamorphism beyond the period of hydrocarbon generating peak(Ro.m≌0.95%)offers the most effective ways to elaborate the hydrocarbon generating potential of coals.
CARBON ISOTOPIC CHARACTERISTICS OF NATURAL GAS IN THE GREAT-MEDIUM COAL-FORMED GAS FIELDS OF CHINA
SHI Xin, SUN Dong-min, QIN Sheng-fei, DAI Jin-xing
2000, 22(1): 16-21. doi: 10.11781/sysydz200001016
Abstract(665) PDF-CN(497)
Abstract:
Based on 283 sets of carbon isotopic data from typical great-medium gas fields in China,the elementary characteristics of gas alkyl hydrocarbon in the great-medium coal formed gas fields of China are discussed by contrasting coal formed gas with oil type gas.The results reveal that the carbon isotope of gas alkyl hydrocarbon has following characteristics:with the increase of carbon number,the δ13C frequency range of methane and its homologues reduces,and the main frequency value gets heavier;④compared with oil type gas,coal formed gas has lower δ13C1 main frequency peak values and higher δ13C2 values;㈣the correlation betweenΔ(δ13C2-δ13C1)and δ13C1 is negative;there are only two types of carbon isotope series for coal formed gas,that is,positive and reversed carbon isotope series;the characteristics of carbon isotope series for gas alkyl hydrocarbon depend on microcomponents,evolutionary degree and pool forming mechanism.
ANALYSIS ON THE HYDROCARBON-GENERATION CONDITIONS OF THE MIOCENE IN THE JINGGU BASIN, YUNNAN
WU Zheng, BEI Feng, SONG Zhen-ya, WEN Jing-ping, XIE Gang-ping, GUO Chi-qi
2000, 22(1): 22-27. doi: 10.11781/sysydz200001022
Abstract(549) PDF-CN(440)
Abstract:
Based on systematic organic geochemical research,it is considered that the dark argillite series in the Lower Miocene Sanhaogou Formation is the important hydrocarbon source layer of the basin,the dark argillite series in the Middle-Upper Miocene Huihuan Formation is the potential hydrocarbon source layer.The good paleoclimate conditions and the reducing water medium environment for sedimentation in the Miocene are favorable for the development of the Miocene hydrocarbon source rock series.
THE LOWER pALEOZOIC GAS-BEARING SYSTEM OF THE ORDOS BASIN AND ITS EXPLORATION DIRECTION
TANG Wen-lian, ZHANG Wan-xuan, XING Jun, YU Yong-sheng
2000, 22(1): 28-34. doi: 10.11781/sysydz200001028
Abstract(622) PDF-CN(544)
Abstract:
As a new thinking and method of research during hydrocarbon exploration,the petroliferous system has got attention from more and more scholars recently.In this paper,the Ordos Basin is preliminary divided into the Middle,the Upper and the Lower Paleozoic three gas bearing systems according to the source of hydrocarbon,the stratohorizon of hydrocarbon occurrence and the assemblage of reservoir and cover.At the same time,the characteristics of the Lower Paleozoic gas bearing system are described emphatically,the distributive rule of the Lower Paleozoic natural gas is summarized,and the favorable prospecting zones potential are pointed out.
STUDY ON PETROLEUM SYSTEMS IN ZHU- Ⅲ SUBBASIN OF SOUTH CHINA SEA
HE Guang-yu, WU Jing-fu, LIU Hai-bin, XU Shun-li
2000, 22(1): 35-39. doi: 10.11781/sysydz200001035
Abstract(720) PDF-CN(446)
Abstract:
Based on the study of petroleum geological features in Zhu-Ⅲ Subbasin of South China Sea,the authors determined the main sources,reservoirs and caprocks in the subbasin by analysizing the relationship of oil(gas)and source rocks in this paper.Moreover,according to the newest definition of petroleum system,the author identified the petroleum systems in Zhu Ⅲ Subbasin by analysizing the characteristics of its tectonics and deposition.The study indicated that there were different oil(gas)systems in Zhu Ⅲ Subbasin at different periods.Namely,there were only one oil system in Wenchang A depression in the early and five oil(gas)systems in the whole subbasin in the late.Finally,the authors also studied the rules of oil(gas)migration and the features of pool forming in these systems.
CHARACTERISTICS OF STRATIGRAPHIC OVERLAP TRAPS AND PETROLEAM PROSPECT IN THE SOUTH MARGIN OF KUQA DEPRESSION
ZHOU Xiao-jin, CHEN Yue, HUANG Ji-wen, MA Hong-qiang, WANG Shu-yi
2000, 22(1): 40-45. doi: 10.11781/sysydz200001040
Abstract(672) PDF-CN(499)
Abstract:
A series of stratigraphic overlap traps were formed as a result of depositional thin out from north to south in the Jurassic and Lower Cretaceous in Kuqa Depression.Reserviors of the Jurassic traps consist of the Lower Jurassic sandstones of coastal shallow lake facies,and the cap rocks are the Middle and Upper Jurassic mudstone of marsh facies.The lower Lower Cretaceous sandstones formed the reserviors of the Lower Cretaceous traps and the mudstones of shallow deep lake facies are their cap rocks.The floor of traps consists of pre Sinian or Sinian Lower Ordovician,its blocking ability directly infleunce effectiveness of traps.The following 3 conditions may form effeetive blocking:(1)the floor is Pre Sinian;(2)floor is the Sinian Ordovician carbonates and karst of floor in the front of trap is undeveloped;(3)the floor is Sinian Ordovician carbonates with development of karst and the karst forms one part of reserviors,which is covered by the upper Cretaceous cap rocks.It was suggested that there was rich hydrocarbon resource in the Kuqa Depression,and the south margin was a hydrocarbon accumulation area migrated from the Triassic Jurassic source rocks of the depression.The stratigraphic overlap traps in the south margin of the Kuqa Depression is a favourable target for hydrocarbon exploration.
STUDY ON THE PALEOGENE POOL-FORMING CONDITIONS IN BOSHIZHUANG AREA
CHEN Gang, LIU Lin-yu, LEI Ming, WEI Guo-biao, HUANG Jin-shan, XUE Yu-wei
2000, 22(1): 46-49. doi: 10.11781/sysydz200001046
Abstract(605) PDF-CN(361)
Abstract:
In this paper,the comprehensive seismic inversion technology under geologic and logging constrained conditions is used to analyse and study the pool forming conditions of the Paleogene continental river lake facies thin layer sand body in Boshizhuang area by tectonic interpretation and reservoir prediction.On this basis,the petroleum migration,accumulation and pool forming conditions,the petroleum enrichment rules,and the favorable trap types and exploration direction of the Paleogene Es 2 and Es 3 oil bearing target layer series in the area are comprehensively analysed and preliminary predicted combined with the research thought and method of petroleum pool forming systems.
DEPOSITIONAL FILLING PATTERN OF A LARGE BACKARC RIFT BASIN—A CASE STUDY OF THE SONGLIAO BASIN
CHEN Jian-wen
2000, 22(1): 50-54. doi: 10.11781/sysydz200001050
Abstract(901) PDF-CN(495)
Abstract:
The characteristics of the Mesozoic volcanic rock in the Songliao Basin reflect that this basin is a backarc rift basin.According to a great amount of drilling and seismic data and based on tectonic evolutionary analysis,sedimentary facies analysis and depositional filling type analysis,the depositional filling pattern of this type of basins is established in this paper.
BRAIDED-RIVER DELTAS OF MIDDLE TRIASSIC, KUQA DEPRESSION, TARIM BASIN
LI Wei-feng, GAO Zhen-zhong, PENG De-tang, WANG Chen-han
2000, 22(1): 55-58. doi: 10.11781/sysydz200001055
Abstract(710) PDF-CN(509)
Abstract:
Braided river delta that braided river systems prograde into an inland lake were well developed in the Middle Triassic of Kuqa depression,Tarim Basin.Their characters are distinct and significantly different from the other types of deltas.The deposits of braided river deltas are mainly composed of pebbled sandstone and medium coarse sandstones.The bars of the braided channel and subaqueous distributary channel are the main bodies of deltas,and they are composed of many,finning upward lenticular sand bodies that pile vertically up each other.A single lenticular sand body has a thickness of 0.5～4m.Cross stratifications are abundant in the braided river deltas,but lateral accretion cross bedding resulting from lateral accretion of sandbodies are the most principal sedimentary structures and one of the most distinct character of braided river deltas.Because the braided river deltas are characterized by a high rate of coarse sediment input,they are less influenced by the waves of lake.The sandbodies of deltas are very excellent reservoirs in that they have a higher porosity,better permeability and a larger,stable thickness.
BACKSTRIPPING INVERSION OFORIGINAL STRATUM THICKNESS IN A SALT BASIN
LI Lan-bin, SUN Jia-zhen, CHEN Zhong-hui, CHEN Wen-li, ZHAO Quan-min, XIAO Xue
2000, 22(1): 59-63. doi: 10.11781/sysydz200001059
Abstract(716) PDF-CN(407)
Abstract:
An improved backstripping inversion method of original stratum thickness was applied to Wuyang salt basin.The method considered erosion,salt movement,interlayerd bedding,and abnormal compaction in the basin.By using this method we can calculate the original stratum thickness and lithologic proportion in every sedimentary telophase based on nowadays stratum thickness,lithologic proportion,abnormal compaction,and salt thickness,which is very important to embedding history analysis and tectonic evolvement analysis in salt basin.
HYDROCARBON EXPULSION OF IMMATURE AND LOW-MATURE SOURCE ROCKS IN CHAOCHANG AREA OF THE SONGLIAO BASIN
HAO Li-ming, HAO Shi-sheng
2000, 22(1): 64-70. doi: 10.11781/sysydz200001064
Abstract(641) PDF-CN(467)
Abstract:
In this paper,the hydrocarbon expulsion course of low mature source rocks from the Cretaceous of Chaochang area and the Tertiary of peripheral Tangyuan area in the Songliao Basin is studied by laboratory simulation.We experiment upon samples at 150℃,200℃,250℃ and 300℃,respectively.The results suggest that the geo chromatographic effects do exist during the hydrocarbon expulsion course of low mature source rocks,which are shown mainly by the differences of group composition,gas chromatogram and biomarkers between expelled and residual hydrocarbon.We also figure and correct the hydrocarbon expulsion quantity and efficiency in the simulation experiment at each temperature point,and obtain the experience formulation for the hydrocarbon expulsion efficiency and evolutionary degree of low mature source rocks in Chaochang area.It is considered that the hydrocarbon expulsion of low mature source rocks is mainly controlled by the abundance,types and thermal evolutionary maturity of organic matter and the movement of groundwater.The low mature source rocks of this area have good hydrocarbon generation capability and hydrocarbon expulsion potential,so they have good prospects for hydrocarbon resources.
HYDROCARBON PREDICTION BY INTEGRATED INFORMATION FROM NONSEISMIC GEOPHYSICAL-GEOCHEMICAL PROSPECTION
GUO Shao-bin, LIU Qing-hai
2000, 22(1): 71-73. doi: 10.11781/sysydz200001071
Abstract(655) PDF-CN(393)
Abstract:
As tectonic reservoirs have been discovered one after another,the focal points of exploration have been changed to various subtle traps which will be found with greater difficulty and lower success rate.The study on the direct detection of hydrocarbon then becomes a popular topic in current hydrocarbon exploration domain.The method is to detect the microcosmic effects and anomalies of hydrocarbon by means of geophysical and geochemical prospecting.Taking Rangzijing area in the south of the Songliao Basin as an experimental area,the practical surface measurement is done by the geochemical prospecting of acidolysis hydrocarbon,ΔC,soil thermoluminescence,Rn detection and soil electrical conductivity based on the study of sequence stratigraphy,reservoirs and fault sealing as well as the summary of predecessor's prediction experience on surface geophysical geochemical prospecting for hydrocarbon.By use of BP and SOM two neural network methods,hydrocarbon prediction is made from integrated information of geophysical geochemical prospecting,and good effects are obtained.
A NEW MODEL FOR DISTINGUISHING HYDROCARBON RESERVOIRS IN GEOCHEMICAL LOGGING AND ITS APPLICATION TO KEERQING OIL FILED
MENG Yuan-lin, XIAO Li-hua, ZHANG Qing-chang, HOU Chang-ye, LI Tai-hao, HAO Cui-juan, ZHANG Chong-gang, LI Ge
2000, 22(1): 74-76. doi: 10.11781/sysydz200001074
Abstract(591) PDF-CN(450)
Abstract:
This paper presents a new model for distinguishing hydrocarbon reservoirs by 3D trend analysis using geochemical logging parameter Pg,geophysical well logging parameters AC and Rt.Keerqin Oil Field was taken as an example to illustrate the use of the model.
PRINCIPLE OF ACID-ROCK REACTION FOR IMPROVING RESERVIOR PERMEABILITY：SOME EXAMPLES OF RESERVIOR MODIFICATION
ZHANG Shou-peng, WANG Wei-qing, XIA Yun
2000, 22(1): 77-80. doi: 10.11781/sysydz200001077
Abstract(621) PDF-CN(515)
Abstract:
An acidizing fluid for improving reservior permeability was developed by application of reservior lithology,oil field chemistry and drilling technology,which greatly increased success of reservior modification and daily product of single well.It showed that the fluid have successfully been applied to different reserviors in Zhuangxi,Fanjia,Shenghai areas and gained big benefit.There is a bright prospeet for application of acidizing fluid to various reserviors of non marine complex oil province.
AN ANALYSIS OF GEOLOGICAL FACTORS OF C-2 RESERVIOR INJURY IN HANQU OIL FIELD, NORTH SHAANXI
WU Liang, LI Xue-yan, DUAN Xiao-qun
2000, 22(1): 81-84. doi: 10.11781/sysydz200001081
Abstract(741) PDF-CN(459)
Abstract:
Based on analysis of lithology,physical porperties,pore feature,pore filling mineral composition and formation fluid in reservior C-2 in Hanqu oil field of northern Shaanxi,the authors discussed the main geological factors related to injury of reservior C-2 during exploration and exploitation.Organic dirt,acid sensitivity and water lock effect are the main factors caused injury of reservior C-2,and water sensitivity,velocity sensitivity and fluid property are the minor factors.As a result,some suggestions are proposed to avoid reservior injury during development,such as injection of wax proof agent,clay stabilzing agent and Fe 3+stabilizing agent etc.
THE EFFECT OF TEMPERATURE ON PYROLYSIS OF ASPHALTENES
XIONG Yong-qiang, GENG An-song, WANG Chun-jiang, SHENG Guo-ying, FU Jia-mo
2000, 22(1): 85-89. doi: 10.11781/sysydz200001085
Abstract(681) PDF-CN(453)
Abstract:
In this study,pyrolysis experiments have been performed at different temperatures to onvestigate the possible effects of temperature on the recovery of the biomarkers from biodegraded oils.The results showed that the yield of the dichlormethane estracts is maximum at 340℃.In addition,pyrolysis temperatures lower than 300℃ have little effevt on the distribution of the biomarkers in the pyrolysates of asphaltenes.So 300℃ is a relatively suitable asphaltene pyrolysis temperature for oil/oil correlation.
A NEW METHOD OF IODINE CATALYTIC COLORIMETRIC DETERMINATION AND ITS APPLICATION IN THE GEOCHEMICAL PROSPECTING FOR HYDROCARBON
XUE Jian-hua, XU Yang, GU Jun, REN Yi-fa
2000, 22(1): 90-93. doi: 10.11781/sysydz200001090
Abstract(609) PDF-CN(409)
Abstract:
The method of iodine catalytic colorimetric determination who takes Fe(SCN)3-NaNO2 as a background reaction has high sensitivity(detection limit up to 10-8),wide linear ranges,and high precision and accuracy.The analysis using this method is simple and rapid,and has obtained good effects in its application to geochemical prospecting for hydrocarbon.
ANALYSIS OF HYDROCARBON GROUP COMPOSITION OF LIGHT CRUDE OIL (INCLUDING CONDENSATE)
GOU Jie, XIE Xiao-yu
2000, 22(1): 94-96. doi: 10.11781/sysydz200001094
Abstract(742) PDF-CN(587)
Abstract:
A displacement method of chromatography for analysis of group composition of light crude oil and condensate was introduced in the paper.The samples were filled into chromatographic columm,silica gel was used as stationary phase,and ethanol was used to replace the hydrocarbon adsorbed by silica gel.Hydrocarbon composition moved out in different time were determined according to their refractive index(RI).Volumes of various group composition were calculated by using addible RI of hydrocarbon mixtute,then their volume percentage was determinded.This method may be applied to analysis of light composition of heavy oil.

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