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| 1 | The relationship between methylated chromans and maturity of organic matter in the source rocks from Jianghan hypersaline basin显示文摘The distribution,the relative composition,and their variation of methylated chromans(MTTC) with maturation of organic matter in the source rocks from Mingjia 1 well,Jianghan hypersaline basin,have been analyzed and studied. There is a close relationship between the distribution of methylatd chromans and paleosalinity of depositional environment. In the Eq1-Eq3 source rocks deposited under hypersaline environment with lower Pr/Ph ratio,higher gammacerane index and abundant organic sulfur-containing compounds,methyl MTTC and dimethyl MTTC are main components,but in the Eq4 source rocks deposited non-hypersaline environment with relatively higher Pr/Ph ratio,lower gammacerane index and organic sulfur-containing compounds,trimethyl MTTC is a major compound in methylate chromans. Obviously,the distributions and the compositions of methylated chromans in the source rocks are in harmony with biomarker indicators indicating the paleaosalinity and redox of depositional environment. The relationship between the ratio of 5,8-dimethyl MTTC to 7,8-dimethyl MTTC(dimethyl MTTC ratio) and the maturity of organic matter in the source rocks from Mingjia 1 well has been discussed. The results show that dimethyl MTTC ratio increased with the burial depth and the maturation of organic matter in the source rocks,especially in immature level. It is noteworthy that this ratio is very susceptible to small variation in the maturity of organic matter in the source rocks when vitrinite reflectance Ro is less than 0.65%. It may imply that this ratio is a good and susceptible aromatic maturity indicator for the relative maturity of organic matter in immature source rocks. | BAO JianPing1,ZHU CuiShan1 & MA AnLai2 1 Key Laboratory of Oil & Gas Resource and Exploration Technology,Ministry of Education,Geochemistry Department,Yangtze University,Jingzhou 434023,China 2 Institute of Petroleum Exploration and Development,Sinopec,Beijing 100083,China | 2009 | Science China Earth Sciences2009，52，S1： | 8 |
| 2 | Immature crude oils in the salt lake depositional environment are related to organic matter precipitated at stage of carbonate in salt lake sedimentation sequences显示文摘The present paper studies the mineralogy and geochemistry of a geological section in Jianghan basin. Widely distributed immature oils in this basin have been shown to relate to the carbonate depositional stage of salt lake sedimentation cycle. It is concluded that only when the content of organic carbon in the rocks is taken into account, is it meaningful to calculate the immature oil in the source rocks. | PENG Ping’an SHENG Guoying FU Jiamo JIANG Jiagang | 2000 | Chinese Science Bulletin2000，45，S1： | 5 |
| 3 | Influence of depositional environment on coalbed methane accumulation in the Carboniferous-Permian coal of the Qinshui Basin, northern China显示文摘Based on analyses of the lithofacies palaeo-geography of the Taiyuan and the Shanxi Formations in the Qinshui Basin, the spatial variations of the coal seam thickness, coal maceral composition, coal quality, and gas content, together with the lithofacies of the surrounding rocks in each palaeogeographic unit were investigated. The results show that the thick coals of the Taiyuan Formation are mainly distributed in delta and barrier island depositional units in the Yangquan area in the northern part of the basin and the Zhangzi area in the southeastern part of the basin. The thick coals of the Shanxi Formation are located within transitional areas between delta plain and delta front depositional units in the central southern part of the basin. The Taiyuan Formation generally includes mudstone in its lower part, thick, continuous coal seams and limestones in its middle part, and thin, discontinuous coal seams and limestone and sand-mud interbeds in its top part. The Shanxi Formation consists of thick, continuous sandstones in its lower part, thick coal seams in its middle part, and thin coal seams, sandstone, and thick mudstone in its upper part. From the perspective of coal-bearing sedimentology and coalbed methane (CBM) geology, the lithology and thickness of the surrounding rocks of coal seams play more significant roles in controlling gas content variation than other factors such as coal thickness, coal macerals, and coal quality. Furthermore, it is found that the key factors influencing the gas content variation are the thicknesses of mudstone and limestone overlying a coal seam. At similar burial depths, the gas content of the Taiyuan coal seams decreases gradually in the lower delta plain, barrier-lagoon,delta front, barrier-tidal flat, and carbonate platform depositional units. The CBM enrichment areas tend to be located in zones of poorly developed limestone and well-developed mudstone. In addition, the gas content of the Shanxi Formation is higher in the coals of the delta front facies compared to those in the lower delta plain. The CBM enrichment areas tend to be associated with the thicker mudstones. Therefore, based on the lithologic distribution and thickness of the rocks overlying the coal seam in each palaeogeographic unit of the Taiyuan and Shanxi Formations, the areas with higher gas content are located in the north-central basin for the Taiyuan coals and in the southern basin for the Shanxi coals. Both of these areas should be favorable for CBM exploration in the Qinshui Basin. | Haihai HOU Longyi SHAO Shuai WANG Zhenghui XIAO Xuetian WANG Zhen LI | 2019 | Frontiers of Earth Science2019，13，3： | 4 |
| 4 | Organic geochemical characterization and depositional paleoenvironments of the Devonian strata in Guizhong region,Guangxi,China显示文摘Devonian strata in the Guizhong region,Guangxi,China consist mainly of marine deposition carbonates(limestones and dolomites) as well as restricted clastic rocks. The strata thickness is measured as 2041m and classified into 14 formations. An integrated field geological,petrographic,sedimentological,palaeobiological,and geochemical study of these strata reveals that the depositional paleoenvironments were carbonate tidal flat,restricted platform,open platform,shelf,platform margin slop,and algal herm. The total organic carbon(TOC) of sedimentary organic matter ranges between 0.07% and 1.96% with average of 0.21%. The organic matter types are Type ? and Type II1. The vitrinite reflectance(R0) of kerogen ranges between 0.99% and 2.03%,indicating the maturated and highly maturated stages. The analytical results of the representative samples collected from shelf and subtidal facies show that the differences of organic matter type and biological diagnostic compounds are related to the types of source rocks deposited in different paleoenvironments. | MAO ZhiChao1,2,DU YuanSheng1,ZHANG Min2,YAN JiaXin1 & ZENG Fang2 1 Key Laboratory of Biogeology and Environment Geology of Education Ministry,Wuhan 430074,China 2 Department of Geochemistry,Yangtze University,Jingzhou 434023,China | 2009 | Science China Earth Sciences2009，52，S1： | 4 |
| 5 | Aeolian Facies Belts in the Taklimakan Desert显示文摘At least at the beginning of the last glacial epoch, the facies belts of dune sand, sandy loam and loess formed by winds had existed in the Taklimakan desert and areas south of it. There were no appreciable changes in the NE and NW wind systems and their wind fqrces that deposited dune sand, sandy loam and loess in the global cold stage since the last glacial epoch (accordingly no marked shifts of the boundaries of these aeolian facies belts took place. In the global warm stage since then, the climate in the Taklimakan desert and areas south of it became warm and dry, resulting in ablation of substantial volumes of ice and snow in their surrounding mountains and thus forming alluvial and diluvial deposits in the region. The alluvial-diluvial actions, however, failed to change the general framework of aeolian facies belts. | Li Baosheng, Dong Guangrong, Zhang Jiasheng, Li Sen,Jin Heling, Chen Huizhong, Wen Xiangle, Wang Yao, Lanzhou Desert Research Institute, Chinese Academy of Sciences, Lamhou, Gansuand Zhu YizhiXi’an Open Laboratory of Loess and Quaternary Geology, Chinese Academy of Sciences, Xi’an, Gansu Fei Zhenbi | 1995 | Acta Geologica Sinica(English Edition)1995，69，3： | 4 |
| 6 | The carbon isotope study of biomarkers in the Maoming and the Jianghan tertiary oil shale显示文摘In terms of the individual carbon isotope data of biomarkers present in the typical freshwater lake sediment (Maoming oil shale) and saline lake sediment lake (Jianghan oil shale) of China, this paper discusses their precursors and depositional environments of biomarkers in both sediment samples. Our studies showed that phytane and pristane of the Maoming oil shale were derived from the phytol side chain of chlorophyll a. By comparing the isotopic composition of 4-methyl sterane with that of sterane and hopane, it is suggested that 4-methyl sterane which has a higher abundance in the Maoming oil shale come from bacteria. The isotopic composition of biomarkers from the Jianghan rock sample (saline lake sediment) is significantly different from that of the Maoming oil shale (freshwater lake sediment). Gammacerane was derived from haloprotozoan, with δ13C being about -25.8‰, just in consistency with the value reported in previous studies. The isotopic composition of phytane and pristane in the Jianghan | Zhiqiang Yu Ping’an Peng Guoying Sheng Jiamo Fu | 2000 | Chinese Science Bulletin2000，45，S1： | 2 |
| 7 | The impact of depositional environment and tectonic evolution on coalbed methane occurrence in West Henan, China显示文摘A deeper understanding of the mechanisms by which geological factors(depositional environment and tectonic evolution) control the occurrence of coalbed methane(CBM) is important for the utilization of CBM resources via surface-drilled wells and the elimination of coal-methane outbursts, the latter of which is a key issue for coal mine safety. Based on drill core data, high-pressure isothermal adsorption experiments, scanning electron microscopy experiments, mercury intrusion porosimetry, and X-ray diffraction experiments, the impact of the depositional environment and tectonic evolution on CBM occurrence of the II-1 coal seam of the Shanxi Formation in West Henan was analyzed. Results showed that the depositional environment led to the epigenetic erosion of tidal flat coal-accumulating structures by shallow-delta distributary channel strata. This resulted in the replacement of the original mudstonesandy mudstone coal seam immediate roof with fine-to-medium grained sandstones, reducing methane storage capacity. Epigenetic erosion by the depositional environment also increased coal body ash content(from 6.9% to 21.4%) and mineral content, filling the cleat system and reducing porosity, reducing methane storage capacity. The maximum methane adsorption capacity of the coal body reduced from35.7 cm3/g to 30.30 cm3/g, and Langmuir pressure decreased from 1.39 MPa to 0.909 MPa. Hence, the methane adsorption capacity of the coal body decreased while its capacity for methane desorption increased. Owing to the tectonic evolution of West Henan, tectonically deformed coal is common; as it evolves from primary cataclastic coal to granulitic coal, the angle of the diffraction peak increases, d002 decreases, and La, Lc, and Nc increase; these traits are generally consistent with dynamic metamorphism.This is accompanied by increases in the total pore volume and specific surface area of the coal body, further increasing the capacity for methane storage. Increases in micropore volume and specific surface area also increase the ability of the coal body to adsorb methane. | Zhaodan Cao Baiquan Lin Ting Liu | 2019 | International Journal of Mining Science and Technology2019，29，2： | 2 |
| 8 | Middle Yangtze sea-basin over Paleozoic-Mesozoic transition——Sedimental continuity and environmental catastrophe显示文摘On the centimeter scale of lithologic change, we conduct poly-statistic analysis on the sedimentary behavior and dynamic features of the stratigraphic sequence from upper Dalong formation to lower Daye formation, which across the Permian-Triassic boundary in East Hubei. From the perspective of stochastically dynamic system, the depositional process of upper Dalong formation can be regarded as a stable Markovian process with weakly stratigraphic correlation and randomly lithologic alteration. Compared to it, the depositional process of lower Daye formation was unstable Markovian process with much closer stratigraphic correlation and ordered lithologic change. As for the replacement style of the sedimental cycle, the former was chaotic, while the latter was periodical. Otherwise, although the overall depositional process of the two formations was continuous, their dynamic characteristics were obviously different. So this P-T sedimental boundary can also be regarded as a dynamic limit. It was a kind of | 黄定华 姚凌青 王君慧 郭浩 张恒 段怡春 李斌 张凡 殷鸿福 | 2002 | Science China Earth Sciences2002，45，8： | 1 |
| 9 | A STUDY ON THE PLEISTOCENE STRATA AND THEIR DEPOSITIONAL ENVIRONMENT ON THE SONGLIAO PLAIN OF NORTHEAST CHINA显示文摘This paper deals with the Pleistocene strata and their depositional environment on theSongliao Plain of Northeast China by applying determinative and analytic techniques of spore-pollen, magnetic stratigraphy, clay minerals, isotopic dating, sedimentary facies, etc. Resultsshow that the underlying sand gravel layer below 75-80 m in depth in the central plain belongsto the alluvial-lacustrine deposits with a time range of 2.48-1.87 Ma, known as the lowerlimit of the Quaternary. As to the massive clay layer, its lower part, 40-30 m thick, belongsto the middle late period of the early Pleistocene, ranging from 2.01-0.73 Ma, while its upperpart, 25-21 m thick, belongs to the middle Pleistocene, ranging from 0.73-20 Ma, with amean sedimentation rate of 3-4 mm/1000a under the big lake, long-range gentle and steadydepositional environment. | 裘善文 夏玉梅 汪佩芳 李凤华 | 1989 | Science China Chemistry1989，32，8： | 0 |
| 10 | 泰国北部中三叠世放射虫硅质岩及其地球化学和沉积环境意义(英文)显示文摘Bedded cherts collected from northern Thailand, including Chiang Dao,Lamphun and Den Chai contain Middle Triassic radiolarian faunas.The faunas from Chiang Dao can be divided into two assemblages.The first assemblage includes Eptingium and other co-occurring species such as | Hathaithip THASSANAPAK Mongkol UDCHACHON Chongpan CHONGLAKMANI | 2012 | 地球学报2012，33，S1： | 0 |
| 11 | Depositional Environments of Bedded Chens in Western Yunnan Segment of Paleo-Tethys, China: a Geochemical Approach显示文摘DepositionalEnvironmentsofBeddedChensinWesternYunnanSegmentofPaleo-Tethys,China:aGeochemicalApproach￥HeFualang;ZhongDaiai(Lab... | He Fualang Zhong Daiai(Laboratory of Lithosphere Teclonic Evolution, Institute of Geology, Chinese Academy of Sciences, Beijing 100029)Liu Benpei(Department of Geology, China University of Geosciences, Beijing 100083) | 1994 | Journal of Earth Science1994，13，1： | 0 |
| 12 | Controls on alkylphenol occurrence and distribution in oils from lacustrine rift basins in East China显示文摘Oils from two lacustrine rift basins in east China are thoroughly investigated using geochemical method to understand controls on alkylphenol occurrence and distribution in oils. Oils in the Lujiapu Depression, Kailu Basin are derived from the Cretaceous source rocks, and those in the Dongying De- pression, Bohai Bay Basin, from the Tertiary source rocks. All oils are experienced relatively short distance of migration and have similar maturity in each basin. Differences in homologue distributions from different oilfields are most likely caused by organic facies variation of source rocks. The oils in the Lujiapu Depression are characterized by high proportion of C3 alkylphenols (prefixes refer to the number of alkylcarbons joined to the aromatic ring of the phenol molecule) and low proportion of cre- sols and C2 alkylphenols compared to oils from the Dongying Depression. Alkylphenol isomer distri- bution is possibly affected by depositional environment especially for C3 alkylphenols. Dysoxic fresh- water environment is favorable for the formation of propyl or isopropyl substituted C3 alkylphenols, while highly reducing saline water is more suitable for trimethyl substituted C3 alkylphenols. Variations in alkylphenol concentrations within a petroleum system are controlled mainly by secondary migration processes with alkylphenol concentrations decreasing along migration direction. Interestingly, coupled with geological factors, a subtle change of alkylphenol concentrations can be applied to differentiate carrier systems. When oil migrates through sandy beds, concentrations of total alkylphenols decrease dramatically with migration distance, while such change is less significant when oil migrates vertically along faults. However, most isomer ratios potentially related to migration distance are not as effective as those alkylcarbazoles in migration diagnosis due to complicated affecting factors. | ZHOU ShuQing HUANG HaiPing | 2008 | Science China Earth Sciences2008，51，7： | 0 |
| 13 | Coal-Forming Model in the Context of Non-marine Sequence Stratigraphy:A Case Study of Jurassic Coal Measures in Northern Qaidam Basin,Northwestern China显示文摘Previous studies of coal sequence stratigraphy have concentrated on coals associated with paralic depositional systems.Little attention has been paid to their counterparts in non-marine intra-mountain coal basins.The northern Qaidam Basin of northwestern China has been extensively developed with abundant oil and gas as well as coal resources in its Jurassic non-marine successions.A total of six sedimentary systems of the Early and Middle Jurassic | Jing Lu~1,Longyi Shao~1,Taijin Liu~2,Qi Ju~2,Huaijun Wen~2,Hao Wang~1 1.Department of Resources and Earth Sciences,China University of Mining and Technology(Beijing),Beijing 100083,China. 2.Qinghai Administration of Coal Geology,Xining 810000,China | 2009 | 地学前缘2009，16，S1： | 0 |
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