最新刊期
卷 12 ， 期 2 ， 1991
- 摘要：A lot of physical and geochemical data of crude oils from Eastern Pearl River Mouth Basin show tnat all the oils are terrestrial-derived ones. The distribution of biomarkers,such as n-alkanes, isoprenoids, steranes, triterpanes and tricyciic terpanes in these oils was studied and lots of special biomarkers which were derived from terrestrial higher plants and fresh algae were discovered. This indicats that they were all sourced by both lacustrine Wenchang Formation mudstone and coaly Enping Formation deposited in Eocene and Eocene-Oiigocene terrestrial environment. Wenchang Formation was a good oil source with high hydrocarbon potential and Enping coaly source rock has been proved to be able to generate oil and gas. Both have therefore provided much abundant reserve of the oil and gas. Since many trap structures were formed earlier than main oil and gas expulsion periods, and the source-reservoir-cap rocks in the basin were well combined, the migration and accumulation of the oil and gas were very ideal. The geochemical migration parameters show that the oils found in Dongsha uplift underwent long distance migration. The migra-tory directions determined by the sterane parameter were coincident with those of important structural ridge, indicating that the oils migrated from oil generating depressions up to the traps in Dongsha uplift along the migratory pathways of the structural ridges, and thus the wide area of the uplift should be the important exploration target for searching big oil fields.关键词：珠江口盆地;地球化学;陆相沉积;生油岩;油源对比;油气勘探839|739|0更新时间：2023-05-30
- 摘要：The analysis of coal-petrology and geochemistry were carried out for Devonian cutinite coal in Luquan Region, Yunnan, so that abundant tetracyclic diterpanoid with the skeletons of phyllocladene and kaurene were determined, but the contents of pristane and phytane were very little or nothing. According to paleoplant study, the coal-forming materials were mainly the short plants of Psilopsid and Lycoposida. It is inferred that the tetracyclic diterpanes were not derived from the resinites which were considered from gymnospermous, but may derived from pteridophytes or non-cyclic isoprenoid alkanes that were reformed by bacteria. This will be further studied in thermo-simulation of organic matter.关键词：角质残植煤;贝叶烷;扁枝烷819|508|0更新时间：2023-05-30
- 摘要：Thermal simulation of hydrocarbon expulsion from Eogene source rock in Damintun Depression were mnde with high temperature-pressure semi-closed experimental system.The results show that the factor controlling hydrocarbon expulsion amounts is organic matter abundance of the source rock, but the factor controlling expulsion efficiency is the type of organic matter. Higher expulsion amount does not always mesn higher expulsion effciency. The content of alkanes and NSO compounds in crude oil is remarkably affected by hydrocarbon expulsion, while that of aromatics is only slightly affected. Hydrocarbon expulsion models of the souree rocks in the depression are characterized by no abrupt peak of petroleum expulsion.关键词：排烃;初次运移;大民电凹陷648|842|0更新时间：2023-05-30
- 摘要：The GC-MS and HPLC methods were used to determine geoporphyrins in the present work. Compounds in HPLC were assigned by coinjections with Gilsonite bitumen,Serpiano oil shale and Boscan oil. Meanwhile the compounds in GC-MS were identified by coinjection with the porphyrin standards which isolated from Gilsonite bitumens, Serpiano oil shale and Boscan oil. The results show that porphyrin distributions in Chinese samples,which were collected from different lacustrine palaeoenvironmentS, are pronounced distinguishable. Samples from fresh water lacustrine are dominated in C32, C31 13, 15-Ethano CAP. Samples from hypersaline water lacustrine are characterised by unknown CAP com-pounds, C31 13, 15-Ethano CAP. However, the coal samples are dominated in aetio compounds. These divergences imply there are different porphyrin precursors and porphyrin transformations (in water column and early diagenesis) in different palaeoenvironments.关键词：地质卟啉;湖盆沉积环境;卟啉(TBDMSO)2;硅衍生物631|537|0更新时间：2023-05-30
- 摘要：The distribution of porphyrin in oils from Jianghan and Biyang Basins, China, was studied. The high contents of C32 and C33 DPEP porphyrin isomers with a additional methyl group in five-membered isocyclic ring is the indicator of an unusual type of porphyrin precusor or input occurred in sedimentary environment with very high salinity and low maturity of oils. The major changes of porphyrins under maturity are the gradual decreases of DPEP/(DPEP+ETIO)% and dealkylation/alkylation within ETIO porphyrins. The ratios of DPEP/ETIO or DPEP/(DPEP+ETIO)%, C31 ETIO-A/C28ETIO-B and ETIO-A C31/C30 can be used as thermal maturity parameters.关键词：卟啉;高效液相色谱;沉积环境;热成熟作用671|618|0更新时间：2023-05-30
- 摘要：In this paper, the synthetic studies on microfluorescence alteration regularity during 30 minites irradiation have been made for more than 100 typical hydrocarbon source rocks. Starting with the two types of organic matter (kerogen and soluble organic matter) which lead to fluorescence and are composed of macerals, the authors discussed some geological factors effecting the fluorescence alteration, including maturity, the type of macerals and the abundance of organic matter, and proposed to use four parameters such as fluorescence alteration gradient (P), turning time (T), equilibrium intensity ratio (IR) and the difference of spectral maximun wavelength (Δλmax) to describe the fluorescence alteration. It is suggested that the fluorescence alteration of source rocks can not only indicate their maturation level, but also provides informations about oil generation, migration and accumulation.关键词：荧光变化;显微组分;成熟度;烃源岩683|723|0更新时间：2023-05-30
- 摘要：Simulation experimental result shows that the rate of natural gas migration decreases with the increase of compaction extent in carbonate or clay rocks. But in quartz sandstone, compaction extent has less effect on migration rate, high rate of migration which is 700 times as it in clay rocks was obtained even if in burial depth of 5000m (equal to 1300kg/cm2). The experimental result also indicates that, during migration of natural gas in carbonate or clay rocks, mineral matrices have different retaining abilities for gaseous hydrocarbons with different molecular weight. That is, C1 and C2 have the highest migration rate, and the ratio of C1/ΣC1-C5 is not only related to the type of organic matter, but also to the migration distance of natural gas. Long distance migration may make it into dry gas.关键词：压实作用;天然气;油气运移;模拟实验639|1003|0更新时间：2023-05-30
- 摘要：Natural gas generated from differentiation of condensate was studied for understanding its change in quantity, constitute and effected factors by experiments of heating and migration. The results demonstrate that the factor causing the cracking of condensate is mainly temperature, and that C1-C4 gas can be easily generated from condensate. As a result, the quantity of gas generated from condensate and C1/C2-4, nonhydrocarbon/alkane of the gas decreases with the increase of temperature. It is also shown by the study that the value of C1/C2-4, nonhydrocarbon/alkane of natural gas increaese with the increase of migration distance, and that the existance of SiO2 media has promoting effect on cracking of the condensate.关键词：凝析油;热裂解;相态运移;温度;介质600|572|0更新时间：2023-05-30
- 摘要：Lower Paleozoic marine sedimentary rocks in Tarim Basin are characterized by the distribution of biomarkers coming from algae and bacteria, including the distribution of lower carbon number n-alkanes with even carbon predominances or odd carbon predominances and the distribution of lower carbon number alkyl cycloalkanes with even carbon predominances. Gammacerane,,aarotanes, pristane and phytane are widespread, and the contents of rearrange steranes are lower than that of regular steranes, but the contents of tricyclic terpanes are higher. Cambrian sedimentary rocks with besin marginal facies are different from Ordovician Sedimentary rocks with open platform and half-deep water shelf facies in the distribution of biomarkers. The contont of C27 sterane increases from Cambrian to Ordovician. Ordovician sedimentary rocks in Tarim Basin are different from those of shallow water shelf facies in North American in the distribution of biomarkers. The later have no pristane and phytane, containing lower carbon number n-alkanes with odd carbon predominances and lower carbon number a1kyl cycloalkanes with odd carbon predominances,and are characetrized by higher content of C29 sterane, the content of rearrange steranes is equal to the content of regular steranes.关键词：塔里木盆地;生物标志物;生物输入;奥陶系;寒武系;沉积环境597|809|0更新时间：2023-05-30
- 摘要：During coalification, the chemical structure of coal is dramatically altered.In order to establish a geochemical scheme for coalification pathways and to reconstruct the key structural transformations of coaly materials, a series of Late Palaeozoic coals from North China and some synthetically coalified samples were analyzed by means of C-13 cross-polarization, magic angle spinning (CP/MAS) NMR spectra. Besides observable changes in carbon aromaticity encountered in coals of different rank, the data revealed also significant changes in aromatic as well as aliphatic structural components. At the early metamorphic stage (lower than 1.28% Rmaxo), the skeletal carbon structure shows relatively low aromatization and contuiris a relatively high amount of substituents. Methylenic and methinic groups are the dominant aliphatic components. With the increase of coal rank and, especially, in the range of major oxygen decrease, these components exhibit relatively high mobility and their amount is gradually reduced. At the medium metamorphic stage (from 1.28 to 2.69% Rmaxo), there is a rapidincrease in aromaticity. This is accompanied by a significant reduction in number and size of aliphatic components. At the late metamorphic stage (higher than 2.65% Rmaxo), aliphatic carbon groupsal most have disappeared, except for a small number of methyl and its adjacent methylene groups. The quantitative variations in the abundancy of the aromatic and aliphatic components tend to be quite moderate. We suggest that the predominant geochemical mechanism in the late metamorphic stuge has changed from aromatization into ring condensation. The changes in the geochemical structure of coal obviously result in differences of yield and composition of hydrocarbons with increasing coalification. The three strutural evolutionary stages correspond with the generation stages of oil, condensate+wet gas and late catagenetic methane respectively.关键词：核磁共振;结构演化;脂族碳结构;芳族碳结构850|455|0更新时间：2023-05-30
- 摘要：Organic enclosure is the direct indicator of hydrocarbon generation, migration, accumulation and evolution. This paper discussed the properties of organic enclosures in different diagenesis stages from the Second Member of the Lower Triassic Jialingjiang Formation and determined the time, depth, direction, passage, phase state of migration and source of the gas. Five indicators, namely the type, amount, temperature, paleosalinity and constituent of the organic enclosures for the pool-forming assessment of natural gas pools are proposed based on typic dissection and contrast. Studying gas migration with organic enclosures, a comprehensive dynamic research in connection time with space could be made and the examinational results of Huangcaoxia gas pools are pretty well.关键词：有机包裹体;成岩序次;喜山期;走向纵张裂缝;动态研究625|382|0更新时间：2023-05-30
- 摘要：The authors proposed that the Dayao copper deposit is of diagenesis reformation type based on mineral deposit geology, geochemistry and organic geochemistty. According to the research of the abundance, existence form, characteristics of organic matter under microscope and simulation experiment, the genesis relation between organic matter and copper mineral has been discovered. The roles of organic matter are not the same in different mineralization processes. It is characterised by organic matter adsorting copper during the formation of ore source beds, and bacterial reduction of sulfate and decomposition of organic matter to produce H2S etc. during the process of diagenetic mineralization, but in the process of reformation mineralization it showed reducing action of CH4 etc. which are produced by organic matter decomposition to SO42-.关键词：铜矿;成岩—改造型矿床;矿床地球化学;有机质;模拟实验615|676|0更新时间：2023-05-30
- 摘要：According to thermo-degradation kinetics data from laboratory and relational formula between activational energy and polymer lifetime established by Toop, the authors calculated the time or temperature of kerogen evolution, and find a new way to get the kinetics data from the laboratory thermo-simulation to apply in geology. The time-temperature relation diagrams and tables of every conversion stage in the kerogen oil-generation phase calculated with the method mentioned above, and the stratum temperature (or time), can be used to calculate the amount and time (or temperature) of oil generation. The result shows that the variation of the reaction speed with different temperature is complicated in different conversion stages of each kerogen oil-generation phase, so it is necessary to make a field survey in different research areas.关键词：热降解动力学;时间—温度关系;模拟实验;聚合物814|417|0更新时间：2023-05-30
- 摘要：Three prinicple factors of hydrocarbon chemical prospecting were selected from the data of 30 indices and 124 stations in North Tarim, Xinjiang, with the methods of multivariate statistics (R-cluster analysis and factor analysis). These principle factors are explained as weathering and denudation factor, oil-gas accumutation factor and oil-gas pool boundary factor. Besides, acidolysis hydrocarbon, ΔC, Hg, Rn and Ultraviolet etc. five methods and ten indices were sieved from commonly used chemical prospecting indices for production usage.关键词：油气化探;聚类分析;因子分析;塔里木盆地718|417|0更新时间：2023-05-30
- 摘要：Thermo-simulation was mede on mudstone source rocks of the Wenchang Formation drilled in the Pearl River Mouth Basin. The result indicates that the abundant C30 4-methyl steranes contained in the source rocks were thermally stable. Nevertheless,the source rocks were the products of special dipositional environment,andwere part of the significant oil sources in the basin since they contributed abunhant C30 4-methyl steranes to the crude oils found in the basin. Therefore, it would be much helpful for oil-source correlation and reserve assessment of the basin if a thorough investigation on the source rocks is made. In addition, after 400℃ and 500℃ heating, another configuration of C30 4-methyl steranes was identified from the extracts, of which the origin may have two probabilities.关键词：珠江口盆地;热模拟实验;4—甲基甾烷;热稳定性;构型;油源对比1011|800|0更新时间：2023-05-30
- 摘要："七五"期间,地球化学研究所广州分部承担了"天然气运移、储集和封盖条件研究",在下列各方面取得重要成果。563|454|0更新时间：2023-05-30
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