Monocarboxylic acids and dicarboxylic acids in sea-floor sediments of the Jizhou Island and estuarine sediments at the Yangtze River mouth have been examined by using thin layer chromatography and gas chromatography a...Monocarboxylic acids and dicarboxylic acids in sea-floor sediments of the Jizhou Island and estuarine sediments at the Yangtze River mouth have been examined by using thin layer chromatography and gas chromatography as well as computerized gas chromatography-mass spectrometry. Free and bound fatty acids distributed in the sea-floor sediments show remarkable even/odd predominances except for sample 8138. Monocarboxylic acids show a unimodal distribution, ranging from n-C14 to n-C32. with the maximum at n-C16 while dicarboxylic acids also show a unimodal distribution, ranging from di-Cl6 to di-C32 with the maximum at di-C24 or di-C28. Evidence from the distribution of fatty adds in the East China Sea sediments indicatesthat these monoearboxylic acids are probably derived from algal debris and,these dicarboxylic acids are derived from terrigenous higher plant detritus.展开更多
The chemistry of organo-clay in somc Tertiary clay-stones from the northern part of the South China Sea was studied. The preliminary results are summarized as follows : (1) Three basic types of organic matter are dist...The chemistry of organo-clay in somc Tertiary clay-stones from the northern part of the South China Sea was studied. The preliminary results are summarized as follows : (1) Three basic types of organic matter are distinguished in the claystones after treated with different chemical agents: spluble, combined and insoluble (kerogen). It is suggested that the distribution of organic matter and its conversion to petroleum are closely related with the composition and structure of expansive clay minerals in the claystones. Therefore, more detailed studies of these expansive clay minerals may provide new indices for oil-generating potentiality. (2) It is considered from the study of the state of existence of organic matter and. of organo-clay complexes in tile clay-stones that the accumulation and preservation of organic substances may substantially take the form of organo-clay complexes in the process of sedimentation and burial and that the organo-clay complexes may make considerable contributions to the formation of petroleum hydrocarbons during diagenesis. Studies in this aspect are of great significance in developing new theories conccrning petroleum generation and in localizing oil-generating occurrences.展开更多
Samples of Continetal shelf sediments from the East China Sea have been studied in an attempt to eluciate the relationship of metallie element enrichment with organoclay complexes. Investigations of the distribution p...Samples of Continetal shelf sediments from the East China Sea have been studied in an attempt to eluciate the relationship of metallie element enrichment with organoclay complexes. Investigations of the distribution patterns and modes of existence of such elements as Cu, Pb, Zn, Ni, Fe, Mn, etc. in the sediments demonstrate that there exist remarkable positive eorrelations between tha distribution of all elements except for Mn,and the content of clay minerals and organic matter and its type. Experimental results show that the removal of combined organic matter will lead to a rapid decrease in the content of these elements (up to mote than 50%). Organoelay chemistry study indicates that the enrichment of metallic elements in the sediments may involve the following processes: (1) the formation of organic metallic complexes by the ineraction between organic matter and metallic ions in the water body; (2) the production of organoclay complexes by the interaction between the organic metallic complexes and clay minerals in the same medium, (3) the deposition of the organoelay complexes due to the variation of water medium conditions during their migration, thus enabling the sediments to be enriched in some metallic elements. From the above, it can be seen that organoclay complexes may be one of the important forms of existense of metallic elements concentrated in the sediments, and also of significance in eluciating the mechanism of fineralization of metallic elements.展开更多
The technique of differential thermal analysis is widely used to investigate dispersed organic matters present in sedimentary rocks in an attempt to interprete some problems concerning petroleum geology. In our practi...The technique of differential thermal analysis is widely used to investigate dispersed organic matters present in sedimentary rocks in an attempt to interprete some problems concerning petroleum geology. In our practice, sufficient separation of organic matters from the mineral matrix has been made and DTA curves measured.On the basis of the characteristie of DTA curves, the classification of the types of organic matters has been done and a series of indexes developed to determine the degrec of metamorphism of organic matters as well as the possible direction of oil migration, thus providing reliable clues to the promising regions for petroleum exploration. Since various factors would act on DTA curves during experiments, correct and comprehensive interpretation of DTA results still await further investigation.展开更多
Ⅰ. INTRODUCTION Organoclay complexes refer to the product formed from reaction of organic substance with clay. It exists widely in soil and marine sediments. Study on its formation, properties and transform is not on...Ⅰ. INTRODUCTION Organoclay complexes refer to the product formed from reaction of organic substance with clay. It exists widely in soil and marine sediments. Study on its formation, properties and transform is not only of important economic value in industry and technology, but also of important theoretical significance in geoscience.展开更多
文摘Monocarboxylic acids and dicarboxylic acids in sea-floor sediments of the Jizhou Island and estuarine sediments at the Yangtze River mouth have been examined by using thin layer chromatography and gas chromatography as well as computerized gas chromatography-mass spectrometry. Free and bound fatty acids distributed in the sea-floor sediments show remarkable even/odd predominances except for sample 8138. Monocarboxylic acids show a unimodal distribution, ranging from n-C14 to n-C32. with the maximum at n-C16 while dicarboxylic acids also show a unimodal distribution, ranging from di-Cl6 to di-C32 with the maximum at di-C24 or di-C28. Evidence from the distribution of fatty adds in the East China Sea sediments indicatesthat these monoearboxylic acids are probably derived from algal debris and,these dicarboxylic acids are derived from terrigenous higher plant detritus.
文摘The chemistry of organo-clay in somc Tertiary clay-stones from the northern part of the South China Sea was studied. The preliminary results are summarized as follows : (1) Three basic types of organic matter are distinguished in the claystones after treated with different chemical agents: spluble, combined and insoluble (kerogen). It is suggested that the distribution of organic matter and its conversion to petroleum are closely related with the composition and structure of expansive clay minerals in the claystones. Therefore, more detailed studies of these expansive clay minerals may provide new indices for oil-generating potentiality. (2) It is considered from the study of the state of existence of organic matter and. of organo-clay complexes in tile clay-stones that the accumulation and preservation of organic substances may substantially take the form of organo-clay complexes in the process of sedimentation and burial and that the organo-clay complexes may make considerable contributions to the formation of petroleum hydrocarbons during diagenesis. Studies in this aspect are of great significance in developing new theories conccrning petroleum generation and in localizing oil-generating occurrences.
文摘Samples of Continetal shelf sediments from the East China Sea have been studied in an attempt to eluciate the relationship of metallie element enrichment with organoclay complexes. Investigations of the distribution patterns and modes of existence of such elements as Cu, Pb, Zn, Ni, Fe, Mn, etc. in the sediments demonstrate that there exist remarkable positive eorrelations between tha distribution of all elements except for Mn,and the content of clay minerals and organic matter and its type. Experimental results show that the removal of combined organic matter will lead to a rapid decrease in the content of these elements (up to mote than 50%). Organoelay chemistry study indicates that the enrichment of metallic elements in the sediments may involve the following processes: (1) the formation of organic metallic complexes by the ineraction between organic matter and metallic ions in the water body; (2) the production of organoclay complexes by the interaction between the organic metallic complexes and clay minerals in the same medium, (3) the deposition of the organoelay complexes due to the variation of water medium conditions during their migration, thus enabling the sediments to be enriched in some metallic elements. From the above, it can be seen that organoclay complexes may be one of the important forms of existense of metallic elements concentrated in the sediments, and also of significance in eluciating the mechanism of fineralization of metallic elements.
文摘The technique of differential thermal analysis is widely used to investigate dispersed organic matters present in sedimentary rocks in an attempt to interprete some problems concerning petroleum geology. In our practice, sufficient separation of organic matters from the mineral matrix has been made and DTA curves measured.On the basis of the characteristie of DTA curves, the classification of the types of organic matters has been done and a series of indexes developed to determine the degrec of metamorphism of organic matters as well as the possible direction of oil migration, thus providing reliable clues to the promising regions for petroleum exploration. Since various factors would act on DTA curves during experiments, correct and comprehensive interpretation of DTA results still await further investigation.
文摘Ⅰ. INTRODUCTION Organoclay complexes refer to the product formed from reaction of organic substance with clay. It exists widely in soil and marine sediments. Study on its formation, properties and transform is not only of important economic value in industry and technology, but also of important theoretical significance in geoscience.
