The results obtained in this paper indicate that carbazole-type compounds have high thermal stability and also show stability in oxidation and bio-degradation. This kind of compounds still has a high concentration and...The results obtained in this paper indicate that carbazole-type compounds have high thermal stability and also show stability in oxidation and bio-degradation. This kind of compounds still has a high concentration and complete distribution in the analyzed dry asphalt samples, showing that they are particularly useful in studying petroleum migration of paleo-pool. During the basin＇s first-stage of oil-gas pool formation in the Silurian in Tazhong and Tabei areas of Tarim Basin （at the end of Silurian period） and the second-stage in the Awati area （in Permian）, the petroleum experienced a long-distance migration. During the formation of the Silurian paleo-pools in Tazhong Uplift at the end of Silurian, the petroleum mainly came from the lower and middle Cambrian source rocks in the Manjiaer sag. The petroleum migrated towards the southwest-south entering the Silurian reservoir beds in Tazhong first. Then, it further migrated within Silurian from northwest to southeast along the highs of the Structural Belts to the region of the Silurian pinchout boundary in Tazhong. In Tabei Uplift, during the first-stage of pool formation, the petroleum was also from the lower and middle Cambrian source rocks in the Manjiaer sag. It migrated northwest entering the Silurian reservoir beds in the Tabei Uplift firstly, and then the migration continued in the same direction within the Silurian reservoirs and finally the petroleum was trapped in higher positions. During the second-stage pool formation in the Silurian beds in the areas around Awati sag, the petroleum mainly came from the lower-middle Cambrian source rocks in the Awati sag. The petroleum migrated from the generation center to Silurian reservoirs in all directions around the sag through major paths, and the petroleum was finally trapped in higher locations.展开更多
Petroleum migration process of Bamianhe oilfield of Dongying depression, EastChina is evaluated on the basis of our detailed work on geochemistry of the crude oil and thesource. Molecular tracers, especially nitrogen ...Petroleum migration process of Bamianhe oilfield of Dongying depression, EastChina is evaluated on the basis of our detailed work on geochemistry of the crude oil and thesource. Molecular tracers, especially nitrogen compounds, are employed in assessing style of oilmigration and accumulation. Additionally, absolute quantitative results of heteroaromatics includingdibenzofuran, dibenzothio-phene and fluorene with similar basic frames to pyrrolic nitrogeniccompounds are also used to evaluate the quantity of petroleum migration. According to apparentmigration effects of the pyrrolic nitrogen compounds, it is indicated that most of Bamianhe oil wasderived from potential source kitchen―Niu-zhuang sag, migrated and accumulated at Bamianhe faultbelt through selective paths according to a main filling point displayed. Generally, upwardmigration trend from the main point along the south slope is noted. There are observable migrationeffects from Guangli subsag to the north Bamianhe and Yangjiao-gou oilfields showing Guangli subsagwas a secondary kitchen accounting for the oils in the north portion. Significant vertical migrationeffects shown in several cross sections demonstrate that faults well developed in the area play animportant role in oil migration and accumulation. Unformality, sandstone reservoirs distributedlocally also suggest important fairways in connecting sources with traps. The tectonic and acombination of tectonic and lithological mechanism are identified as the critical mechanisms inentrapping hydrocarbons. Migration trend suggested by nitrogenic compounds agrees well with analysisof lateral compositional variety and thermal maturity gradient. This study also confirms well withour previous studies. It is the location of source rocks, tectonic and stratigraphic characteristicsthat have a comprehensive control on the model of hydrocarbon migration and accumulation inBamianhe oilfield. Results also show that the oils are mostly derived from the deep parts of theNiuzhuang and Guangli sags within normal oil window.展开更多
文摘The results obtained in this paper indicate that carbazole-type compounds have high thermal stability and also show stability in oxidation and bio-degradation. This kind of compounds still has a high concentration and complete distribution in the analyzed dry asphalt samples, showing that they are particularly useful in studying petroleum migration of paleo-pool. During the basin＇s first-stage of oil-gas pool formation in the Silurian in Tazhong and Tabei areas of Tarim Basin （at the end of Silurian period） and the second-stage in the Awati area （in Permian）, the petroleum experienced a long-distance migration. During the formation of the Silurian paleo-pools in Tazhong Uplift at the end of Silurian, the petroleum mainly came from the lower and middle Cambrian source rocks in the Manjiaer sag. The petroleum migrated towards the southwest-south entering the Silurian reservoir beds in Tazhong first. Then, it further migrated within Silurian from northwest to southeast along the highs of the Structural Belts to the region of the Silurian pinchout boundary in Tazhong. In Tabei Uplift, during the first-stage of pool formation, the petroleum was also from the lower and middle Cambrian source rocks in the Manjiaer sag. It migrated northwest entering the Silurian reservoir beds in the Tabei Uplift firstly, and then the migration continued in the same direction within the Silurian reservoirs and finally the petroleum was trapped in higher positions. During the second-stage pool formation in the Silurian beds in the areas around Awati sag, the petroleum mainly came from the lower-middle Cambrian source rocks in the Awati sag. The petroleum migrated from the generation center to Silurian reservoirs in all directions around the sag through major paths, and the petroleum was finally trapped in higher locations.
基金hispaperissupportedbytheNaturalScienceResearchCouncilofChi na (underChina 973NationalKeyResearchandDevelopmentProgram #G1 999 4331 0 ) .
文摘Petroleum migration process of Bamianhe oilfield of Dongying depression, EastChina is evaluated on the basis of our detailed work on geochemistry of the crude oil and thesource. Molecular tracers, especially nitrogen compounds, are employed in assessing style of oilmigration and accumulation. Additionally, absolute quantitative results of heteroaromatics includingdibenzofuran, dibenzothio-phene and fluorene with similar basic frames to pyrrolic nitrogeniccompounds are also used to evaluate the quantity of petroleum migration. According to apparentmigration effects of the pyrrolic nitrogen compounds, it is indicated that most of Bamianhe oil wasderived from potential source kitchen―Niu-zhuang sag, migrated and accumulated at Bamianhe faultbelt through selective paths according to a main filling point displayed. Generally, upwardmigration trend from the main point along the south slope is noted. There are observable migrationeffects from Guangli subsag to the north Bamianhe and Yangjiao-gou oilfields showing Guangli subsagwas a secondary kitchen accounting for the oils in the north portion. Significant vertical migrationeffects shown in several cross sections demonstrate that faults well developed in the area play animportant role in oil migration and accumulation. Unformality, sandstone reservoirs distributedlocally also suggest important fairways in connecting sources with traps. The tectonic and acombination of tectonic and lithological mechanism are identified as the critical mechanisms inentrapping hydrocarbons. Migration trend suggested by nitrogenic compounds agrees well with analysisof lateral compositional variety and thermal maturity gradient. This study also confirms well withour previous studies. It is the location of source rocks, tectonic and stratigraphic characteristicsthat have a comprehensive control on the model of hydrocarbon migration and accumulation inBamianhe oilfield. Results also show that the oils are mostly derived from the deep parts of theNiuzhuang and Guangli sags within normal oil window.
