The Yadu-Ziyun-Luodian aulacogen(YZLA) developed into being NW-trending in the Late Paleozoic,and was considered as an important passive continental margin aulacogen in Guizhou Province, South China. This tectonic zon...The Yadu-Ziyun-Luodian aulacogen(YZLA) developed into being NW-trending in the Late Paleozoic,and was considered as an important passive continental margin aulacogen in Guizhou Province, South China. This tectonic zone is considered a large intracontinental thrust-slip tectonic unit, which has undergone a long period of development. It was ultimately determined in the Yanshanian, where the typical Upper Paleozoic marine shales were deposited. In 2021, Well QSD-1 was deployed in the Liupanshui area at the northwest margin of the aulacogen, and obtained a daily shale gas flow of 11011 m3in the Carboniferous Dawuba Formation. It thus achieved a breakthrough in the invesgation of shale gas in the Lower Carboniferous in South China, revealing relatively good gas-bearing properties and broad exploration prospects of the aulacogen. Being different from the Lower Paleozoic strata in the Sichuan Basin and the Yichang area of the Middle Yangtze, the development of the Carboniferous Dawuba Formation in the aulacogen exhibits the following characteristics:(1) The Lower Carboniferous shale is thick and widely distributed, with interbedded shale and marlstone of virous thickness;(2) The total organic carbon(TOC) content of the shale in the Dawuba Formation ranges from 1% to 5%, with an average of 2%, and the thermal maturity of organic matter(Ro) varies from 1% to 4%, with an average of2.5%, indicating good hydrocarbon generation capacity;(3) The main shale in the aulacogen was formed during the fault subsidence stage from the Middle Devonian to the Early Permian. Although the strong compression and deformation during the late Indosinian-Himalayan played a certain role in destroying the formed shale gas reservoirs, comparative analysis suggests that the area covered by the current Triassic strata has a low degree of destruction. It therefore provides good conditions for shale gas preservation,which can be regarded as a favorable area for the next exploration.展开更多
In the last 200 years within the East-European platform more than 120 notable earthquakes occurred. One of the strongest earthquakes occurred in the south of Komi Republic in 1939.Since 1996 in territory of Komi Repub...In the last 200 years within the East-European platform more than 120 notable earthquakes occurred. One of the strongest earthquakes occurred in the south of Komi Republic in 1939.Since 1996 in territory of Komi Republic continuous seismic survey are conducted by station Syktyvkar(SYK).In the period of continuous survey,14 close seismic events were registered;eight of them occurred in the Kirov-Kazhim aulacogen.展开更多
The mechanism of the breakup of supercontinent is a scientific frontier in the field of supercontinent study.The rifting and breakup of supercontinent has long been considered to be related to mantle plume.Paleo-
The Kunyang Aulacogen is a continental rift which initiated at the beginning of the Middle Proterozoic. Itwas generated on the rigid continental crust represented by the crystalline Kangding Complex, and is boundedby ...The Kunyang Aulacogen is a continental rift which initiated at the beginning of the Middle Proterozoic. Itwas generated on the rigid continental crust represented by the crystalline Kangding Complex, and is boundedby two N-S-trending deep faults--Anninghe-Luzhijiang Fault and Xiaojiang Fault. Its early stage of rupturewas characterized by alkalinc mafic igneous activities in the Dahongshan Group and Hekou Group. Duringthe later tensile-depression stage the aulacogen evolved into a graben where scdimentation of the KunyangGroup took place. The sedimentary sequence comprises terrestrial red beds, algal dolomite, marine black shaleand carbonate rocks which are quite typical of rift sedimentary association, and contains stratabound copperdeposits of the well-known Dongchuan type.展开更多
Confirming thick hydrocarbon generation center and discovering thick porous reservoirs are two key factors to start the Permian gas exploration of the Western Sichuan Depression.In this paper,the Sinian-Cambrian struc...Confirming thick hydrocarbon generation center and discovering thick porous reservoirs are two key factors to start the Permian gas exploration of the Western Sichuan Depression.In this paper,the Sinian-Cambrian structures of this area were studied by adopting the layer-flattening technology and the Lower Paleozoic thickness map was prepared in order to describe the Permian hydrocarbon generation center.Then,combined with seismic facies analysis and field outcrop bioherm discovery,the distribution of Middle Permian reef flat reservoirs were predicted.Finally,the favorable conditions for reef flat reservoir dolomitization were analyzed based on fault features.The study indicates that:(1)Sinian top represents a huge depression in the profile flatted by the reflecting interface of Permian bottom,with normal faults filled by thick Lower Paleozoic sediments at both sides,revealing that a aulacogen formed during the Khanka taphrogeny exists in the Western Sichuan Depression,where very thick Cambrian strata may contain hydrocarbon generation center,making Permian strata have the material conditions for the formation of large gas pools;(2)the Middle Permian strata in the Western Sichuan Depression exhibit obvious abnormal response in reef flat facies,where three large abnormal bands are developed,which are predicted as bioherm complex combined with the Middle Permian bioherm outcrop discoveries in surface;and(3)deep and large extensional faults are developed in reef flat margin,manifesting as favorable conditions for the development of dolomite reservoirs.The results show that the Middle Permian traps in the Western Sichuan Depression contain resources up to 7400×10^(8)m^(3),showing significant natural gas exploration prospects.By far,one risk exploration well has been deployed.展开更多
基金supported by the China Geological Survey Projects of Shale Gas Survey in the GuizhongNanpanjiang Area (DD20190088)Investigation and evaluation of Paleozoic shale gas in Yunnan-Guizhou-Guangxi region (DD20230264)+1 种基金Investigation and Evaluation of Carboniferous Shale Gas in Southern Guizhou-Central Guangxi (ZDDYR2023018)Reservoir Characteristics and Gas Accumulation of Trough-platform Shale: A Case Study of Early Carboniferous Shale in Yaziluo Rift Trough (YKC2023-YC08)。
文摘The Yadu-Ziyun-Luodian aulacogen(YZLA) developed into being NW-trending in the Late Paleozoic,and was considered as an important passive continental margin aulacogen in Guizhou Province, South China. This tectonic zone is considered a large intracontinental thrust-slip tectonic unit, which has undergone a long period of development. It was ultimately determined in the Yanshanian, where the typical Upper Paleozoic marine shales were deposited. In 2021, Well QSD-1 was deployed in the Liupanshui area at the northwest margin of the aulacogen, and obtained a daily shale gas flow of 11011 m3in the Carboniferous Dawuba Formation. It thus achieved a breakthrough in the invesgation of shale gas in the Lower Carboniferous in South China, revealing relatively good gas-bearing properties and broad exploration prospects of the aulacogen. Being different from the Lower Paleozoic strata in the Sichuan Basin and the Yichang area of the Middle Yangtze, the development of the Carboniferous Dawuba Formation in the aulacogen exhibits the following characteristics:(1) The Lower Carboniferous shale is thick and widely distributed, with interbedded shale and marlstone of virous thickness;(2) The total organic carbon(TOC) content of the shale in the Dawuba Formation ranges from 1% to 5%, with an average of 2%, and the thermal maturity of organic matter(Ro) varies from 1% to 4%, with an average of2.5%, indicating good hydrocarbon generation capacity;(3) The main shale in the aulacogen was formed during the fault subsidence stage from the Middle Devonian to the Early Permian. Although the strong compression and deformation during the late Indosinian-Himalayan played a certain role in destroying the formed shale gas reservoirs, comparative analysis suggests that the area covered by the current Triassic strata has a low degree of destruction. It therefore provides good conditions for shale gas preservation,which can be regarded as a favorable area for the next exploration.
文摘In the last 200 years within the East-European platform more than 120 notable earthquakes occurred. One of the strongest earthquakes occurred in the south of Komi Republic in 1939.Since 1996 in territory of Komi Republic continuous seismic survey are conducted by station Syktyvkar(SYK).In the period of continuous survey,14 close seismic events were registered;eight of them occurred in the Kirov-Kazhim aulacogen.
文摘The mechanism of the breakup of supercontinent is a scientific frontier in the field of supercontinent study.The rifting and breakup of supercontinent has long been considered to be related to mantle plume.Paleo-
文摘The Kunyang Aulacogen is a continental rift which initiated at the beginning of the Middle Proterozoic. Itwas generated on the rigid continental crust represented by the crystalline Kangding Complex, and is boundedby two N-S-trending deep faults--Anninghe-Luzhijiang Fault and Xiaojiang Fault. Its early stage of rupturewas characterized by alkalinc mafic igneous activities in the Dahongshan Group and Hekou Group. Duringthe later tensile-depression stage the aulacogen evolved into a graben where scdimentation of the KunyangGroup took place. The sedimentary sequence comprises terrestrial red beds, algal dolomite, marine black shaleand carbonate rocks which are quite typical of rift sedimentary association, and contains stratabound copperdeposits of the well-known Dongchuan type.
基金Supported by National Science and Technology Major Project“Clastic reservoir identification and prediction in the Sichuan Basin”(Grant No.2008ZX05002-004-003).
文摘Confirming thick hydrocarbon generation center and discovering thick porous reservoirs are two key factors to start the Permian gas exploration of the Western Sichuan Depression.In this paper,the Sinian-Cambrian structures of this area were studied by adopting the layer-flattening technology and the Lower Paleozoic thickness map was prepared in order to describe the Permian hydrocarbon generation center.Then,combined with seismic facies analysis and field outcrop bioherm discovery,the distribution of Middle Permian reef flat reservoirs were predicted.Finally,the favorable conditions for reef flat reservoir dolomitization were analyzed based on fault features.The study indicates that:(1)Sinian top represents a huge depression in the profile flatted by the reflecting interface of Permian bottom,with normal faults filled by thick Lower Paleozoic sediments at both sides,revealing that a aulacogen formed during the Khanka taphrogeny exists in the Western Sichuan Depression,where very thick Cambrian strata may contain hydrocarbon generation center,making Permian strata have the material conditions for the formation of large gas pools;(2)the Middle Permian strata in the Western Sichuan Depression exhibit obvious abnormal response in reef flat facies,where three large abnormal bands are developed,which are predicted as bioherm complex combined with the Middle Permian bioherm outcrop discoveries in surface;and(3)deep and large extensional faults are developed in reef flat margin,manifesting as favorable conditions for the development of dolomite reservoirs.The results show that the Middle Permian traps in the Western Sichuan Depression contain resources up to 7400×10^(8)m^(3),showing significant natural gas exploration prospects.By far,one risk exploration well has been deployed.
