IN nature, there are many coexisting examples of petroleum with metallic ore deposit. There are metallicore deposits in the border and interior of many petroliferous basins, such as the bedded Pb-Zn ore depositin carb...IN nature, there are many coexisting examples of petroleum with metallic ore deposit. There are metallicore deposits in the border and interior of many petroliferous basins, such as the bedded Pb-Zn ore depositin carbonate rock, gold sulfide ore deposit in black shale, cinnabar deposit, copper sandstone, kupferschiefer ore deposit, etc. (Tang Kuilian, 1995). The liquid hydrocarbon all was found in the Pb-Zn oredeposit, Mercury deposit, Carlin gold deposit (Shi Jixi et al., 1995) as well as the beds adjacentto them. There are a large number of bitumen and organic inclusions with hydrocarbon in the low-temperature Hg-Sb-Au ore concentrated district in southwestern margin to Yangtze platform. Fu Jiamao (1988)thought that they are remains after the ancient oil reservior destructed. In pace with constantly finding thecoexisting phenomena of metallic ore deposit and petroleum as well as further studying the relationship between both of them, it is progressively known that there are close links between oil/gas field and展开更多
Combined evidence from the outcrop and the fluid inclusion assemblage (FIA) analysis indicates that there exist two episodes of fluid flow controlled by the tectonic activity. The first episode was recorded mainly in ...Combined evidence from the outcrop and the fluid inclusion assemblage (FIA) analysis indicates that there exist two episodes of fluid flow controlled by the tectonic activity. The first episode was recorded mainly in the reservoir rock of the Honghuayuan Formation,representing the fluid flow of hydrocarbon charging. The second episode occurred mainly along the fault systems,representing the fluid move-ment when the ancient oil reservoir was destroyed. The host mineral morphology,homogeneous tem-perature,and salinity of the FIAs record an episodic fluid movement. Characters of high homogenous temperature,low salinity and a quick temperature variation of the first episode fluid flow may indicate an early-stage fluid eruption,and correspondingly,fine-grained calcite was formed. Temperature of the erupted fluid tended to decrease during its mixing with the upper formation fluid and finally had the same temperature as the upper formation. From then on,the temperature was rather steady and fa-vored the growth of the coarse calcite. Due to this character of the temperature variation of the episodic fluid flow,we can use the homogenous temperature of the FIA of the coarse calcite to date the forma-tion and the destruction time of the Majiang ancient oil reservoir. Episodic fluid flow was known for its inhomogeneous trapping,which resulted in the failure of dating according to the burial history. But taking a close look at its temperature variation,we think that the latest stage of fluid flow,characterized by steady state temperature and grow of the coarser crystals,can be used for dating. It will be of great value if this method is proved to be effective. The formation and the destruction time of the Majiang ancient oil reservoir were dated to be in the Indosinian Period and the late Yanshan-early Hymalayan Period respectively. This conclusion is in great discrepancy with the common accepted idea that the Majiang ancient oil reservoir was formed and destroyed during the Caledonian tectonic movement. Even so,this paper fu展开更多
文摘IN nature, there are many coexisting examples of petroleum with metallic ore deposit. There are metallicore deposits in the border and interior of many petroliferous basins, such as the bedded Pb-Zn ore depositin carbonate rock, gold sulfide ore deposit in black shale, cinnabar deposit, copper sandstone, kupferschiefer ore deposit, etc. (Tang Kuilian, 1995). The liquid hydrocarbon all was found in the Pb-Zn oredeposit, Mercury deposit, Carlin gold deposit (Shi Jixi et al., 1995) as well as the beds adjacentto them. There are a large number of bitumen and organic inclusions with hydrocarbon in the low-temperature Hg-Sb-Au ore concentrated district in southwestern margin to Yangtze platform. Fu Jiamao (1988)thought that they are remains after the ancient oil reservior destructed. In pace with constantly finding thecoexisting phenomena of metallic ore deposit and petroleum as well as further studying the relationship between both of them, it is progressively known that there are close links between oil/gas field and
基金Supported by National Basic Research Program of China (Grant No.2006CB202308,2005CB422107)National Natural Science Foundation of China (Grant No.40472078)
文摘Combined evidence from the outcrop and the fluid inclusion assemblage (FIA) analysis indicates that there exist two episodes of fluid flow controlled by the tectonic activity. The first episode was recorded mainly in the reservoir rock of the Honghuayuan Formation,representing the fluid flow of hydrocarbon charging. The second episode occurred mainly along the fault systems,representing the fluid move-ment when the ancient oil reservoir was destroyed. The host mineral morphology,homogeneous tem-perature,and salinity of the FIAs record an episodic fluid movement. Characters of high homogenous temperature,low salinity and a quick temperature variation of the first episode fluid flow may indicate an early-stage fluid eruption,and correspondingly,fine-grained calcite was formed. Temperature of the erupted fluid tended to decrease during its mixing with the upper formation fluid and finally had the same temperature as the upper formation. From then on,the temperature was rather steady and fa-vored the growth of the coarse calcite. Due to this character of the temperature variation of the episodic fluid flow,we can use the homogenous temperature of the FIA of the coarse calcite to date the forma-tion and the destruction time of the Majiang ancient oil reservoir. Episodic fluid flow was known for its inhomogeneous trapping,which resulted in the failure of dating according to the burial history. But taking a close look at its temperature variation,we think that the latest stage of fluid flow,characterized by steady state temperature and grow of the coarser crystals,can be used for dating. It will be of great value if this method is proved to be effective. The formation and the destruction time of the Majiang ancient oil reservoir were dated to be in the Indosinian Period and the late Yanshan-early Hymalayan Period respectively. This conclusion is in great discrepancy with the common accepted idea that the Majiang ancient oil reservoir was formed and destroyed during the Caledonian tectonic movement. Even so,this paper fu
