Reconstructed synsedimentary paleogeomorpholgy is an effective method in predicting the distribution of sandbodies and can provide valid evidence in the search for reservoirs. Based on a synsedimentary paleogeomorphol...Reconstructed synsedimentary paleogeomorpholgy is an effective method in predicting the distribution of sandbodies and can provide valid evidence in the search for reservoirs. Based on a synsedimentary paleogeomorpholgy reconstruction of the third member of the Dongying formation (Ed3) in the Qikou sag,the basic paleogeomorphic characteristics of Ed3 are described and the spatial distributions of denudation and subsidence areas are discussed. Key boundary faults controlling the deposition of important sediment bodies are proposed and the interrelations among faulted slope-break belts or flexure belts,intra-depression uplifts and sags,sediment sources and sediments input points have been investigated.展开更多
Organic inclusions from the Shahejie Formation of the Eogene period in the Bohai Gulf Basin, eastern China, were examined using micro\|FT. IR and fluorescence microscopy in addition to the measurement of their homogen...Organic inclusions from the Shahejie Formation of the Eogene period in the Bohai Gulf Basin, eastern China, were examined using micro\|FT. IR and fluorescence microscopy in addition to the measurement of their homogenization temperatures (T\-h). Two populations of organic inclusions were recognized, the primary and the secondary organic inclusions. The primary organic inclusions contain organic materials with relatively long alkyl chains (the carbon atom number is 15 to 17), whereas the secondary organic inclusions contain a certain amount of H\-2S besides organic materials which have relatively short alkyl chains with the carbon atom number of 5 to 6. The T\-h values of the primary organic inclusions are within the range of 87-91℃, lower than those of the secondary organic inclusions (T\-h=98-105℃), suggesting that the primary organic inclusions experienced a lower degree of thermal evolution than the secondary inclusions. This inference is consistent with the fluorescence spectroscopic characteristics and parameters (T\-\{max\}, Q values) of the organic inclusions. Data from the organic inclusions together with the petroleum geology setting revealed that the primary inclusions resulted from the migration of hydrocarbons generated within the strata they are hosted, whereas the secondary organic inclusions were trapped in the process of secondary hydrocarbons expelled out of the source rocks to the locations where they were accumulated. The thermal properties of the organic inclusions are consistent with the maturation of the oil generated from the Shahejie Formation. The abundance of the organic inclusions and their characteristics indicate that the member Es3 of the Shahejie Formation is highly potential for oil accumulation. The results could provide essential clues to petroleum exploration in the Bohai Gulf Basin.展开更多
基金Projects 40872077 supported by the National Natural Science Foundation of China2008CDA098 by the Key Natural Science Foundation of Hubei Province
文摘Reconstructed synsedimentary paleogeomorpholgy is an effective method in predicting the distribution of sandbodies and can provide valid evidence in the search for reservoirs. Based on a synsedimentary paleogeomorpholgy reconstruction of the third member of the Dongying formation (Ed3) in the Qikou sag,the basic paleogeomorphic characteristics of Ed3 are described and the spatial distributions of denudation and subsidence areas are discussed. Key boundary faults controlling the deposition of important sediment bodies are proposed and the interrelations among faulted slope-break belts or flexure belts,intra-depression uplifts and sags,sediment sources and sediments input points have been investigated.
基金ThisprojectwassupportedbytheNationalNaturalScienceFoundationofChina (No .496 72 131) .
文摘Organic inclusions from the Shahejie Formation of the Eogene period in the Bohai Gulf Basin, eastern China, were examined using micro\|FT. IR and fluorescence microscopy in addition to the measurement of their homogenization temperatures (T\-h). Two populations of organic inclusions were recognized, the primary and the secondary organic inclusions. The primary organic inclusions contain organic materials with relatively long alkyl chains (the carbon atom number is 15 to 17), whereas the secondary organic inclusions contain a certain amount of H\-2S besides organic materials which have relatively short alkyl chains with the carbon atom number of 5 to 6. The T\-h values of the primary organic inclusions are within the range of 87-91℃, lower than those of the secondary organic inclusions (T\-h=98-105℃), suggesting that the primary organic inclusions experienced a lower degree of thermal evolution than the secondary inclusions. This inference is consistent with the fluorescence spectroscopic characteristics and parameters (T\-\{max\}, Q values) of the organic inclusions. Data from the organic inclusions together with the petroleum geology setting revealed that the primary inclusions resulted from the migration of hydrocarbons generated within the strata they are hosted, whereas the secondary organic inclusions were trapped in the process of secondary hydrocarbons expelled out of the source rocks to the locations where they were accumulated. The thermal properties of the organic inclusions are consistent with the maturation of the oil generated from the Shahejie Formation. The abundance of the organic inclusions and their characteristics indicate that the member Es3 of the Shahejie Formation is highly potential for oil accumulation. The results could provide essential clues to petroleum exploration in the Bohai Gulf Basin.
