石油实验地质

2007, 29(2): 108-108. doi: 10.11781/sysydz200702108

Abstract(425) PDF-CN(372)

Abstract:

MAIN FACTORS CONTROLLING HYDROCARBON RESERVOIRS AND EXPLORATION DIRECTIONS IN THE PRE-SALT SEQUENCE IN PRECASPIAN BASIN

Jin Zhijun, Wang Jun, Zhang Shenggen, Wang Junling, Zhang Faqiang

2007, 29(2): 111-115. doi: 10.11781/sysydz200702111

Abstract(596) PDF-CN(501)

Abstract:
Hydrocarbon resources in the pre-salt is very rich,and eighty-five percent of oil and gas proven reserves is distributed in the presalt in PreCaspian Basin.There are three series of hydrocarbon-bearing strata in the pre-salt sediments in the basin:Devonian,Carboniferous and Permian.Among them,Carboniferous is the most important oil-bearing layer system.In PreCaspian Basin,four secondary tectonic units are developed.They are southern PreCaspian Sub-basin,eastern PreCaspian Sub-basin,western and northern-western PreCaspian Sub-basin and Central Depression.In different sub-basins,the main factors controlling reservoir formation are different.Based on analysis of the basic conditions for reservoir formation in the pre-salt succession in PreCaspian Basin,this paper researched into main factors controlling reservoirs in the pre-salt in each sub-basin.Study indicated that main factors controlling reservoir are the distribution of Carboniferous carbonate and Lower Permian salt in southern sub-basin,and distribution of Carboniferous carbonate and Lower Permian clastic reservoir in eastern sub-basin,and Carboniferous and Lower Permian carbonate reservoir in western and northern-western sub-basin.On the basis of analysis of main controlling factors,this paper put forward further exploration directions for the pre-salt in PreCaspian Basin.

NEW EXTRACTION TECHNIQUE OF ADSORPTION HYDROCARBON GAS AND ITS ROLE IN SURFACE OIL AND GAS GEOCHEMICAL EXPLORATION

Cheng Tongjin, Li Guangzhi, Chen Yinjie

2007, 29(2): 116-119. doi: 10.11781/sysydz200702116

Abstract(745) PDF-CN(463)

Abstract:
A degassing apparatus has been developed based on vertical hydrocarbon migration theory and material adsorption principle,thus a new extraction and detection method of adsorption hydrocarbon gas has been established.The apparatus is scientifically structured and easy to operate.It is suitable to be used in in situ hydrocarbon analysis in the filed.The technical elements of this detection method ensure that the adsorption hydrocarbon gas can be degassed completely,so that the full hydrocarbon components can be detected by means of this method.It is regarded that the hydrocarbon gas extracted by acid extraction method,which is commonly used in the current oil and gas geochemical exploration practices,can not be defined as "adsorption hydrocarbon gas" because of the basic principle and extraction process of this method.Therefore,it is often difficult to distinguish anomalies of reservoir-sourced acid extraction hydrocarbon from those of in situ inherent hydrocarbon.The uncertainty of hydrocarbon sources influences the application effect of acid-extraction method.The newly developed adsorption method of hydrocarbon,with its ability to acquire the dynamic information of a given oil and gas system,can remedy the insufficiency of the commonly used hydrocarbon detecting method,and improve the effect of oil and gas geochemical exploration.

BASEMENT DECOUPLING STRUCTURE IN JIANGNAN-XUEFENG——SERIES 1 OF THE SOUTHERN STRUCTURE STUDIES

Ding Daogui, Guo Tonglou, Hu Mingxia, Liu Yunli

2007, 29(2): 120-127. doi: 10.11781/sysydz200702120

Abstract(718) PDF-CN(523)

Abstract:
The basement decoupling structure is the reaction in continent plate when the margin of continent plate is subducted,subdued,extruded and shortened.Extruded under horizontal effect,the earth crust is decoupled along such flabby zones as "low velocity zone" and "high conductivity formation".These huge flexile shear zones in metamorphic basement divide the lithosphere plate into several "thin sheets".Along the decoupling surface,great scale slide and nappe take place,resulting in the Jura-type fold and superimposition of sedimentary cover of the Paleozoic basin within plate.Interbed shear slide and distorted rebuilding and shortening from strong to weak take place so as to balance the middle and upper crusts.It is discussed in this paper the attribute of Jiangnan-Xuefeng uplift which is neither "thick-skinned structure" of orogenic belt nor "thin-skinned structure" of sedimentary cover fold but "intergradational basement decoupling structure".From Indosinian to early Yanshanian,decoupling and nappe take place from SE to NW(S to N,E to W at the meanwhile).It is the dynamic source and domination controlling deformation of Yangtze marine facies Meso-Paleozoic basins and at the same time it controls the generation and accumulation of marine facies petroleum.

DYNAMIC MECHANISM OF NAPPE STRUCTURES IN THE SOUTHWEST OF FUJIAN PROVINCE—TAKING THE GUANGPING NAPPE STRUCTURE AS AN EXAMPLE

Zhou Zhenqi

2007, 29(2): 128-132. doi: 10.11781/sysydz200702128

Abstract(643) PDF-CN(354)

Abstract:
Nappe structures spread widely in the southwest of Fujian Province.There are 2 basic types:decoupling decollement and thrust nappe.The middle-deep thrust nappe structure in Guangping is part of nappe structures in the southwest of Fujian.Its generation and evolution,influenced by plate tectonic dynamic backgrounds in southwestern Fujian and even the whole Fujian and China,have experienced 6 stages:Hercynian intracontinental lifting(D₃-P₂);early Indo-Chinese extension decollement-compression deformation gliding(T_1-2);late Indo-Chinese synclinal structure generation(T₃);early Yanshanian early lifting and late thrust nappe(J_1-2);late Yanshanian early lifting and erosion and late differential settlement(J₃-K);and Himalayan uplift-erosion(E-Q).

TECTONIC EVOLUTION AND SEDIMENTARY CHARACTERISTICS OF THE FORELAND BASIN IN THE NORTHERN PART OF LOWER YANGTZE AREA

Du Jianbo, He Mingxi, Zhang Yanxia, Xie Qifeng, Ma Rongfang, Zhang Dongmei

2007, 29(2): 133-137. doi: 10.11781/sysydz200702133

Abstract(916) PDF-CN(438)

Abstract:
The northern part of lower Yangtze area is controlled by the interaction of the Yangtze platform,the North China platform and the Qinling micro-platform.The Yangtze platform starts to dive to the Qinling platform during the late Permian and the northern part of lower Yangtze area accomplishes the tectonic environment conversion from extension to extrusion.The foreland basin in the northern part of lower Yangtze area is formed during the middle Triassic.The evolution of the foreland basin can be divided into 3 stages:1)sprout and budding stage(P₃-T₁),during which the passive continental margin basin is formed,characterized by a set of typical deep-water to semideep-water flysch;2)flourishing stage(T₂-T₃),during which the marine foreland develops to continental foreland,forming marine molasse and continental molasse;3)continued and extinction stage(J_1-2),during which the intracontinental foreland is formed,characterized by coal-bearing clastic rock sediments of continental facies.The foreland basin experiences the evolution from marine to continental facies gradually,and the sedimentary characteristics diverge with the different stages.Though the sedimentation and subsidence center migrates continually,it is characterized by continental facies superposed to marine facies.

IDENTIFICATION OF THE DETACHMENTS IN THE FORELAND FOLD-THRUST BELT IN SOUTHERN MARGIN OF JUNGGAR BASIN

Dong Chenqiang, Sun Ziming, Hong Taiyuan

2007, 29(2): 138-142. doi: 10.11781/sysydz200702138

Abstract(685) PDF-CN(504)

Abstract:
The foreland fold-thrust belt in the southern margin of Junggar Basin is located in the north side of the Tianshan orogenic belt,experienced superimposition and juxtaposition of multi-prototype basins from the Carboniferous and formed a series of possible detachments,which are the main factors controlling formation and evolution of skin-typed structural styles and causing the unconformities between the upper and the lower structures.Based on comprehensive analysis of the outcrops and interpretation of seismic data in this area,six detachments are identified,which are the Middle Permian Lucaogou and Hongyanchi Formations,the Lower Jurassic Badaowan Formation,the Middle Jurassic Xishanyao Formation,the Cretaceous Tugulu Group,the Palaeocene Anjihaihe Formation and the Neocene Taxihe Formation from the deep to the shallow.There exists one or more detachments in different segments of the foreland fold-thrust belt whose eras have the tendency of becoming new from east to west.The identification of the detachments are significant to the structure modeling and trap determination.

APPLICATION AND DEVELOPMENT OF PETROLEUM SYSTEM IN CHINA BASINS

Luo Kaiping, Zhou Zuyi, He Zhiliang

2007, 29(2): 143-148. doi: 10.11781/sysydz200702143

Abstract(820) PDF-CN(439)

Abstract:
In the over 20 years since the idea of petroleum system was put forward,petroleum exploration worldwide has undergone a way from risk to sense,random to system and blindness to high effect.The naissance and application of petroleum system have markedly improved exploration success ratio and become an important exploration tool.In the 1960s,petroleum geologists and explorationists in China brought forward the idea of "oil generation system".And in the following 20 years,the knowledge and theory system of "source controlling theory" and "determining depression and selecting zone" which is equivalent to petroleum system was developed,playing an important role in guiding petroleum exploration in relatively simple basins in the east of China.In the late 1980s,several innovative petroleum system concepts including "multiplex petroleum system","complex petroleum system" and "petroleum reserve unit" which are closer to Chinese basin style and characteristics were put forward based on the study of multicycle superimposed or deformed basins in the west and south of China,resulting in great discoveries in this field.Generations of Chinese petroleum workers have been exploring and practicing successively,whose experiences have enhanced the amalgamation of petroleum system with Chinese basins,making petroleum system Sinicized.

RELATIONSHIP BETWEEN TECTONIC EVOLUTION AND PETROLEUM SYSTEM FORMATION——TAKING THE JIMSAR SAG OF EASTERN JUNGGAR BASIN AS AN EXAMPLE

Fang Shihu, Song Yan, Xu Huaimin, Fan Ruidong, Liu Loujun, Xu Xiucai

2007, 29(2): 149-153. doi: 10.11781/sysydz200702149

Abstract(917) PDF-CN(467)

Abstract:
The eastern Junggar Basin has entered the stage of continental basin evolution since the late Carboniferous.It is composed of several hydrocarbon bearing sags and uplifts with complicated tectonic evolution history,which can be divided into 4 stages:rift-faulted basin during Pemian, faulted-depression basin from Triassic to Jurassic,intra-continental depression basin from Cretaceous to Eocene,and rejuvenated foreland basin during late Cenozoic.Tectonic evolution of the Jimsar Sag has great influence on petroleum system formation in the following 3 aspeots:a) Tectonic evolution controls the formation of source rocks and source-reservoir-caprock assemblages;b) Tectonic evolution is likely to postpone the evolution processes of source rocks;c) The most important,tectonic evolution may control the multi-phase hydrocarbon generation and the multi-phase pool forming of every petroleum system,which make up of the critical moments for hydrocarbon migration,accumulation,rebuilding and preservation of composite petroleum system.

STUDY ON FORMATION OF INORGANIC CARBON DIOXIDE GAS RESERVOIRS

Yang Xiaoyong, Liu Deliang, Wang Baichang, Li Zhensheng, Tan Yin, Yang Qiang

2007, 29(2): 154-161. doi: 10.11781/sysydz200702154

Abstract(2152) PDF-CN(414)

Abstract:
This paper presents the general situation on the geological and geochemical characteristics of CO₂ pools,their forming condition and distributions as well as their controlled geological-tectonic environments.The degassing experiment of volcanic rocks in Songliao Basin presents the CO₂ releasing parameters for different types of volcanic rocks.Geochemical modeling calculation of CO₂ releasing has been done based on dynamic metamorphism caused by ductile-brittle shearing deformation.The amount of CO₂ releasing is calculated and its relative calculation model is proposed during the contact metamorphism in carbonate rocks.Based on research,the model for the calculation of CO₂ degassing and formation of CO₂ pools under the condition of degassing from volcanic rocks,dynamic and contact metamorphism have been established.The distributions of CO₂ pools and their exploration localities in China have also been proposed.

STUDY ON THE HYDROCARBON-GENERATION AMOUNT UNDER THE COMPLEX GEOLOGICAL HISTORY IN THE POLY-CYCLIC BASIN

Li Huili, Shao Zhibing, Jin Zhijun, He Zhiliang

2007, 29(2): 162-166. doi: 10.11781/sysydz200702162

Abstract(823) PDF-CN(361)

Abstract:
The hydrocarbon-generation amounts under the complex geological history in poly-cyclic basin were discussed through several sets of thermal simulation experiments.According to the results of experiments,the hydrocarbon-generation amounts in the continuous generation history is greatly different from the one in the discontinuous histories.When hydrocarbon generation reaction completing,the accumulative hydrocarbon amounts generated in the histories with two discontinuous hydrocarbon generation courses are always more than the hydrocarbon amount generated in the continuous generation history.Moreover,the hydrocarbon-generation amounts are various in different discontinuous generation histories.Based on the discussion about the results of thermal simulation experiments,the differences in the hydrocarbon-generation amount was thought resulting from the different hydrocarbon generation courses,discharging efficiencies and surrounding conditions.It can be deduced that the generated hydrocarbon amount for the old source rocks during the complex and long geological history in the poly-cyclic basin should be different from the hydrocarbon amount for the source rock during the simple continuous generation history in the singular-cyclic basin.

DISTRIBUTION MODE OF REMAINING OIL OF FLUVIAL AND DELTA RESERVOIR——TAKING THE SHENGTUO OILFIELD OF THE BOHAI BAY BASIN AS AN EXAMPLE

Huang Shiyan

2007, 29(2): 167-171. doi: 10.11781/sysydz200702167

Abstract(695) PDF-CN(336)

Abstract:
The paper studied mechanism and distribution of macro and micro remaining oil in fluvial and delta reservoir,and built distribution mode of macro and micro remaining oil.The paper put forward that the remaining oil in fluvial and delta reservoir enriched mainly in margin facies,hereabout fault,round wedgeout and part uncontrolled by well.The plane distribution of remaining oil is mainly controlled by sediment microfacies,fault and sand distribution.The interlayer distribution of remaining oil is mainly controlled by vertical heterogeneity.The remaining oil enriched in upside of positive rhythm reservoir of fluvial while in downside of negative rhythm reservoir of delta.Micro remaining oil has five shape types,such as network,speckle,attached,trickle and confuse of oil and water.

OIL CHARGING ORIENTION AND ACCUMULATION CHARACTERISTICS OF OIL RESERVOIRS IN THE FUSHAN SAG, BEIBUWAN BASIN

Li Meijun, Wang Tieguan, Liu Ju, Zhang Meizhu, Lu Hong, Ma Qinglin, Gao Lihui

2007, 29(2): 172-177. doi: 10.11781/sysydz200702172

Abstract(757) PDF-CN(595)

Abstract:
By using reservoir geochemical approach,this paper mainly studies on the hydrocarbon migration and charging orientation of Eocene Liushagang Formation(E₂l) oil reservoirs in the Fushan Sag,Beibuwan Basin.Combined with the petroleum geological background,the reason that caused the difference between oil pools in upper(E₂l₃¹) and mid-lower parts(E₂l₃²—E₂l₃³)of Liushagang Formation has also been discussed.It shows that the oils in E₂l₃¹ horizon in Huachang oil and gas field are mainly sourced from the Bailian sub-Sag.The unconformity between E₂l₂ and E₂l₃,the sandstone of fan delta front and the faults are good carrier beds for these oils.Comparison with the E₂l₃¹,the oils in E₂l₃²-E₂l₃³ horizons have relatively higher density,lower maturity,high content of CO₂ and lower oil and gas yields.All these characteristics are determined by the special fault systems and specific geological background.The oils in E₂l₃²-E₂l₃³ horizons are mainly derived from the source rock of the third member of the Liushagang Formation in Huachang area,which have relatively lower thermal maturity and limited hydrocarbon generation potential.Controlled by the giant faults that cut through the E₂l₃ stratum and terminated in the basement,the volcanic-mantle derived CO₂ can migrate through these faults and charge in E₂l₃²-E₂l₃³ traps.The geochemical research provides direct evidence for hydrocarbon charging orientation and pathways.

AN INVESTIGATION ON THE GEOCHEMICAL CHARACTERISTICS OF CRUDE OIL FROM WENLIU AREA IN THE DONGPU SAG, BOHAI BAY BASIN

Chang Zhenheng, Chen Zhonghong, Zhang Yuti, Peng Jun, Jin Zhenhua

2007, 29(2): 178-182. doi: 10.11781/sysydz200702178

Abstract(801) PDF-CN(368)

Abstract:
The group composition and carbon isotope of oil,chromatogram and mass spectrum of saturation hydrocarbon in the source rocks and crude oil from Wenliu area in Dongpu Sag,Bohai Bay Basin were analyzed.The studying results show that the crude oil in the Shahejie Formation was mainly immature.The content of saturation hydrocarbon in the samples is 38.3%～79.3%.The carbon isotope of group composition of crude oil is-27.4‰～-28.7‰,and the fractionation effect of the carbon isotope of group composition is not obvious.There is predominance of phytane to pristane,and the ratio of pristane to phytane is lower than 0.5 in most samples.For the most samples,the values of αααC₂₉20R/20(R+S) and C₂₉ββ/(αα+ββ) are lower than 0.40,the content of diasteranes is low,and the sterane of C₂₇ is predominance in the series of steranes.The ratio of diasteranes to regsteranes is related to the maturity of samples.High maturity is correspond to high value of the ratio.For the samples distributing between the Wendong fault and Wenxi fault,the content of Gammacerance is high,the ratio of gamma-cerance to C₃₀hopanes is 0.40～0.99,the ratio of gammacerance to HC₃₁22S is 2.11～4.15 and the geochemical characteristics demonstrated that they formed in the salt lake facies sedimentary environment.For the samples located in the east of Wendong fault,the content of Gammacerance was low,the ratio of gammacerance to C₃₀ hopanes is 0.05～0.15,the ratio of gammacerance to HC₃₁22S is 0.16～0.28,and the geochemistry characteristics demonstrated that they formed in the sedimentary environment of low salty.

DISTRIBUTION OF METHYL PHENANTHRENE IN SEDIMENTS AND ITS IMPACTING ON MATURITY PARAMETERS

Song Changyu, Jin Hongrui, Liu Xuan, Wang Zhong

2007, 29(2): 183-187. doi: 10.11781/sysydz200702183

Abstract(836) PDF-CN(439)

Abstract:
In this paper,the distribution features of methyl phenanthrene from some coals in Jiyang Depression and some hydrocarbon source rocks in Bonan Sag were analyzed.The results show that the sedimentary environment and the biologic source have a great influence on the distribution of methyl phenanthrene.In Bonan Sag,the 9-methyl phenanthrene is more abundant than 1-methyl phenanthrene in the lake facies sediments with lower hydrobios being the dominant species.The relative abundances of 3-methyl phenanthrene and 2-methyl phenanthrene increase in the hydrocarbon source rock under the salt lagoon environment and the methyl phenanthrene index is on the high side.But the index is on the low side in the fresh-brackish lake facies sediments.In the coals in Jiyang Depression,the 9-methyl phenanthrene is liable to form in the salty reducing environment with aboundant bacteria and alga,while 1-methyl phenanthrene is more abundant than 9-methyl phenanthrene in the weak oxidizing environment with higher plants being dominant species.The difference causing by biologic source should be considered in utilizing methyl phenanthrene index for evaluating maturity of organics.

GEOCHEMICAL CHARACTERISTICS OF BIOMARKERS EXTRACTED FROM THE LOWER CRETACEOUS COAL MEASURES ROCKS IN JIXI BASIN

Gao Fuhong, Gao Hongmei, Fan Fu

2007, 29(2): 188-191. doi: 10.11781/sysydz200702188

Abstract(706) PDF-CN(347)

Abstract:
By the Gas chromatography and the Gas chromatography-mass spectrogram analysis,the biomarkers in the Lower Cretaceous mud rocks and coals of coal measures from Jixi Basin were studied.The results indicate that n-alkanes in mud rocks show front single-peak type,with the main peak carbons to be C₁₆ or C₁₈.The ratio of Pr/Ph is 2.86～11.22,Pr/n C₁₇ is larger than 1.The n-alkanes in coals show rear single-peak type,with the main peak carbons to be C₂₂ or C₂₃.The ratios of Pr/Ph and Pr/n C₁₇ are 2.86～11.22 and 2.1～3.33 respectively.The values of the OEP and CPI in both mud rocks and coals concentrale on 1.0.The thermal evolution has reached maturation stage.The biomarkers in mud rocks show that the ratio of tricycle terpane plus tetracyclic terpane to C₃₀H is 2.37～3.62.The C₃₁22S/22(S+R),Ts/Tm and G/C₃₀H are 0.57～0.61,0.47～0.81 and 0.11～0.34 respectively.The ααα20R homosteranes in mud rocks appears to be in asymmetrical "V"distribution.The analytic result of the biomarkers show the mud rocks coming mainly from aquatic organisms and depositing in reducing environment with more saline water,which is better for preservation and transformation of organics.The biomarkers in coals show that the ratio of tricycle terpane plus tetracyclic terpane to C₃₀H is lower than that in mud rocks.The ratio of C₃₁22S/22(S+R) is about 0.6,the Ts/Tm and G/C₃₀H are very low.The ααα20R homosteranes of coals appear to be in inverted "L" distribution.The coals are mainly from higher plants,and deposit in oxidizing environment.

ANALYSIS OF THE DIFFERENCES AND GENESIS FOR THE KEKEYA OIL IN TARIM BASIN

Wang Dongliang, Li Yong, Jing Bing, Li Jianli, Guo Jianying, Zeng Changmin, Zhang Xianjun, Feng Xiaojun

2007, 29(2): 192-198. doi: 10.11781/sysydz200702192

Abstract(635) PDF-CN(335)

Abstract:
The oil-and gas-bearing strata are the Neogene Xihepu Formation(N₁x),the Paleogene Kalata Formation(E₂k)and the Cretaceous in Kekeya oilfield,Tarim Basin.Researches show that,in this area,the oil properties,group components,saturated hydrocarbon chromatograms,saturated hydrocarbon steranes,terpanes,carbon isotopes,nitrogen compounds etc.have regularly changed in spatial distribution.The density and the concentration of carbazole of the crude oil decrease gradually from the deep to the shallow,while some other parameters,such as content of saturated hydrocarbon,C₂₁-/C₂₂+,C₂₁₊₂₂/C₂₈₊₂₉,reset/regular steranes,carbon isotope and ratio of gas to oil,increase gradually from the deep to the shallow.These varying tendences in vertical were due to migration fractionation from the bottom to the top.Besides,the lateral differences between different strata or between the different oil-bearing formations in the same stratum are mainly controlled by the sedimentary facies belt and physical properties of reservoirs.And they are induced by grouped accumulation.

THE INFLUENCES OF MATURATION AND WATER IN THE ISOTOPIC COMPOSITIONS OF PYROLYSIS

Liu JinPing, Geng Ansong, Lu Jialan, Wang Tongshan, Yang Chupeng, Jin Zhaoxun

2007, 29(2): 199-202. doi: 10.11781/sysydz200702199

Abstract(590) PDF-CN(299)

Abstract:
In order to characterize the influences of maturation and water in the hydrogen isotopic compositions of individual n-alkanes from the pyrolysis,the simulation test of typeⅡsource rock was made by high-pressure autoclave.The analytical results indicate that in the condition of non-hydrous pyrolysis,with the rise of temperature(290～400℃),the individual n-alkanes have the shift toward enriched hydrogen,the difference is over 20‰.But in hydrous pyrolysis,the hydrogen isotopic fractionation is smaller because the lower maturation at the same temperature.Moreover,water has no obvious effect on the hydrogen isotopic compositions of individual n-alkanes in the simulation test.So,the hydrogenisotopic compositions of lipid biomarkers were not obviously influenced by maturation and the hydrogen isotopic exchange during diagenesis.The hydrogen isotopes of lipid biomarkers from source rock can be used to discuss the differences of source rocks and depositional environments and to correlate oil/oil and oil/source.

EXPLORATION OF SUBTLE OIL AND GAS RESERVOIR IN BLOCK KD32-33, XINTAN OIL FIELD, THE BOHAI BAY BASIN

Hu Haiyan

2007, 29(2): 203-206. doi: 10.11781/sysydz200702203

Abstract(872) PDF-CN(328)

Abstract:
The block KD32-33 in Xintan Oil Field of the Bohai Bay Basin has already come into the stage of subtle oil and gas reservoir exploraion.The seismic prediction of thin-bedded fluvial sandbodies is the key for rolling exploration and exploitation in this area.Applying the Conseis complex oil and gas reservoir forecast system which has not been generalized,the reconstruction of well-log and the reservoir prediction of texture-logging constraint nonlinear inversion are made.Thin-bedded sandbodies are effectively recognized.The planar distribution of sandbodies is predicted,instructing the rolling exploration and exploitation of oil and gas.The attainment rate is confirmed high by drilling wells.

APPLICATION OF STATISTIC METHODS IN PETROLEUM RESOURCES QUANTITATIVE ASSESSMENT IN THE QIANJIANG SAG, THE JIANGHAN BASIN

Zhou Zongying

2007, 29(2): 207-211. doi: 10.11781/sysydz200702207

Abstract(625) PDF-CN(329)

Abstract:
Based on the distribution characteristics of proven oil field reserves size and the changing trend of oil yield and discovery rate per exploration well over the years in the Qianjiang Sag,the Jianghan Basin,three different kinds of statistic methods such as pool size sequence,Weng's life cycle and exploration benefit method have been chosen in the paper.On the foundation of analyzing mathematical principle,mathematical model,parameter feature and application condition,petroleum resources in the Qianjiang Sag are estimated from different angles.The study shows that the amount of petroleum resources in the Qianjiang Sag is about 16 535.2×10⁴ t.Though the exploration degree of petroleum resources is high at present,there still remains some resource potential.The amount of unproven resources is about 5 202.2×10⁴ t,which will provide geological basis for oil and gas exploration plan and medium and long-term development goal.

DETERMINATION OF LIGHT HYDROCARBON IN CRUDE OIL WITH BACK-FLOW GAS CHROMATOGRAPHY METHOD

Zhang Meizhen, Cheng Qiuquan, Jiang Qigui, Zhang Caiming, Zhang Zhirong

2007, 29(2): 212-216. doi: 10.11781/sysydz200702212

Abstract(731) PDF-CN(353)

Abstract:
It is studied in this paper the two analysis methods of light hydrocarbon in crude oil(≤C₁₅) with temperature programming sample injection(PTV) and back-flow GC analysis respectively.Based on the optimized choosing of pressure(P₁,P₂) and pressure changing time and speed control,the light hydrocarbon(≤C₁₅) in crude oil is determined successfully.The heavy components are cut out.The column is protected.The resolution of several components which are hard to separate is better than that requested by GB/T18430.1-2001 and 1998 ASTM of USA.The parameters of light hydrocarbon fingerprint are comparable with those from normal GC analysis.The method is stable and credible.Some samples from the Jungger Basin are analyzed with this method to obtain geochemical parameters of light hydrocarbon.The analysis results show the homogeneity and the migration direction of crude oil samples clearly.

2007 Vol. 29, No. 2

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