Cambrian in Sichuan basin developed thick black shale,varies carbonate and clastic rock,which deposited in different sedimentary environment.Sichuan basin in the upper Yangtze platform contained a record of environmen...Cambrian in Sichuan basin developed thick black shale,varies carbonate and clastic rock,which deposited in different sedimentary environment.Sichuan basin in the upper Yangtze platform contained a record of environment during the Cambrian.Detail facies analyses of Cambrian enable us to discuss the sedimentary environment and palaeogeographic setting.Sedimentation commenced in the Early Cambrian with the deposition of shelf facies(Qiongzhusi Formation and Canglangpu Formation).At this stage,thick shale and clastic rock deposited in Sichuan basin.At the end of the Early Cambrian,a carbonate platform developed in upper Yangtze platform,and Sichuan basin was located in restricted platform(Longwangmiao Formation).In the Middle Cambrian,tidal flat and restricted platform developed in Sichuan basin(Douposi Formation),because of continuous regression.During the Late Cambrian,Sichuan basin was located in carbonate platform again(Xixiangchi Formation).There are three types of sedimentary system in the Cambrian of Sichuan basin:clastic sedimentary system,clastics-carbonate mixed sedimentary system and carbonate sedimentary system.Vertically,the basin shows the evolutionary character of clastic-carbonate sedimentary systems.The three sedimentary systems correspond to three“transgression-regression”cycles of the Cambrian.The transgression in the initial period of the Early Cambrian led to the formation of clastic sedimentary system in the Qiongzhusi Formation of Lower Cambrian.The transgression in the later period of the Early Cambrian led to the formation of clasticcarbonate mixed sedimentary system in the Middle-Lower Cambrian.The transgression in the initial period of the Late Cambrian led to the formation of carbonate sedimentary system in the Xixiangchi Formation of Upper Cambrian.With the end of Late Sinian continental rifting ended,Sichuan basin entered a stable evolutionary stage of the craton basin,while the paleo-land developed in the north and southwest.In Qiongzhusi-Canglangpu period,the basin developed onshore-shelf sedimentary facies from west to east;In Longwangmiao-Xixiangchi period,the basin developed tidal flat-platform-slope sedimentary facies from west to east.展开更多
This paper describes the identification of waterflooded zones and the impact of waterflooding on reservoir properties of sandstones of the Funing Formation at the Gao 6 Fault-block of the Gaoji Oilfield,in the Subei B...This paper describes the identification of waterflooded zones and the impact of waterflooding on reservoir properties of sandstones of the Funing Formation at the Gao 6 Fault-block of the Gaoji Oilfield,in the Subei Basin,east China.This work presents a new approach based on a back-propagation neural network using well log data to train the network,and then generating a cross-plot plate to identify waterflooded zones.A neural network was designed and trained,and the results show that the new method is better than traditional methods.For a comparative study,two representative wells at the Gao 6 Fault-block were chosen for analysis:one from a waterflooded zone,and the other from a zone without waterflooding.Results from this analysis were used to develop a better understanding of the impact of waterflooding on reservoir properties.A range of changes are shown to have taken place in the waterflooded zone,including changes in microscopic pore structure,fluids,and minerals.展开更多
基金supported by the Petro China Innovation Foundation (No.2018D-5007-0105)National Natural Science Foundation of China (42102193)Open Experiment Funding of Southwest Petroleum University (2021KSZ02008 and 2021KSP02031)。
文摘Cambrian in Sichuan basin developed thick black shale,varies carbonate and clastic rock,which deposited in different sedimentary environment.Sichuan basin in the upper Yangtze platform contained a record of environment during the Cambrian.Detail facies analyses of Cambrian enable us to discuss the sedimentary environment and palaeogeographic setting.Sedimentation commenced in the Early Cambrian with the deposition of shelf facies(Qiongzhusi Formation and Canglangpu Formation).At this stage,thick shale and clastic rock deposited in Sichuan basin.At the end of the Early Cambrian,a carbonate platform developed in upper Yangtze platform,and Sichuan basin was located in restricted platform(Longwangmiao Formation).In the Middle Cambrian,tidal flat and restricted platform developed in Sichuan basin(Douposi Formation),because of continuous regression.During the Late Cambrian,Sichuan basin was located in carbonate platform again(Xixiangchi Formation).There are three types of sedimentary system in the Cambrian of Sichuan basin:clastic sedimentary system,clastics-carbonate mixed sedimentary system and carbonate sedimentary system.Vertically,the basin shows the evolutionary character of clastic-carbonate sedimentary systems.The three sedimentary systems correspond to three“transgression-regression”cycles of the Cambrian.The transgression in the initial period of the Early Cambrian led to the formation of clastic sedimentary system in the Qiongzhusi Formation of Lower Cambrian.The transgression in the later period of the Early Cambrian led to the formation of clasticcarbonate mixed sedimentary system in the Middle-Lower Cambrian.The transgression in the initial period of the Late Cambrian led to the formation of carbonate sedimentary system in the Xixiangchi Formation of Upper Cambrian.With the end of Late Sinian continental rifting ended,Sichuan basin entered a stable evolutionary stage of the craton basin,while the paleo-land developed in the north and southwest.In Qiongzhusi-Canglangpu period,the basin developed onshore-shelf sedimentary facies from west to east;In Longwangmiao-Xixiangchi period,the basin developed tidal flat-platform-slope sedimentary facies from west to east.
基金Project supported by the National Natural Science Foundation of China (No. 41172109)the National Natural Science Foundation of Shandong Province (No. ZR2011DM009)the Research Foundation for the Doctoral Program of Higher Education (No. 20110003110014),China
文摘This paper describes the identification of waterflooded zones and the impact of waterflooding on reservoir properties of sandstones of the Funing Formation at the Gao 6 Fault-block of the Gaoji Oilfield,in the Subei Basin,east China.This work presents a new approach based on a back-propagation neural network using well log data to train the network,and then generating a cross-plot plate to identify waterflooded zones.A neural network was designed and trained,and the results show that the new method is better than traditional methods.For a comparative study,two representative wells at the Gao 6 Fault-block were chosen for analysis:one from a waterflooded zone,and the other from a zone without waterflooding.Results from this analysis were used to develop a better understanding of the impact of waterflooding on reservoir properties.A range of changes are shown to have taken place in the waterflooded zone,including changes in microscopic pore structure,fluids,and minerals.
