Fault zones have always drawn attention from the industry,and the performance of a quantitative interpretation of the fault interior structure on seismic data has remained as a big challenge.In this work,we focus on q...Fault zones have always drawn attention from the industry,and the performance of a quantitative interpretation of the fault interior structure on seismic data has remained as a big challenge.In this work,we focus on quantitatively populating the heterogeneity of the fault interior structure in a three-dimensional space on seismic data.To realize this goal,we take the South Wuerxun sub-depression in Hailar Basin as an example of a faulted basin.First,based on a heterogeneity analysis using the drilling and logging information from wells,we establish fault zone geologic models and perform seismic forward modeling to determine the relationship between different fault zone models with different fault dips,internal fillings,and P wave responses.Next,the fault interior structure index(FIS)is constructed,and the response features on the FIS from the fault facies and the host rock are observed.Finally,the FIS is applied to perform the quantitative interpretation and prediction of the heterogeneity in the FIS on seismic data.The results show that the FIS response from the fault zone is higher than that of the host rock in plane,indicating that the former is quantitatively separated from the surrounding host rocks.The FIS values greater than 26 represent the feedback from the fault facies,whereas those less than 26 represent the response from the host rocks.The FIS shows segmented features in the strike,banded in dip on plane.On the slip surface,the FIS indicates the shale smear zone and the location where low-graded and small-scaled faults are densely developed.The heterogeneity prediction result is proven by oil and gas exploration activities.The study results imply that the FIS could indicate a favorable path of the hydrocarbon migration in the fault zone and evaluate the fault sealing parts.The method can explore the quantitative characterization of fault facies and has essential popularization and application values in similar geological application fi elds,including hydrocarbon exploration,development of faulted reservoirs,and geological engineering evaluation related to faults.展开更多
分别于2020和2021年夏季(7-8月)对福建省东张水库的进口、库心和出口3个断面进行水样采集.结果显示,东张水库的浮游植物主要由蓝藻、绿藻和硅藻组成,其中蓝藻门为优势类群.东张水库2020年夏季浮游植物的密度在1.26×10^(7)~4.75...分别于2020和2021年夏季(7-8月)对福建省东张水库的进口、库心和出口3个断面进行水样采集.结果显示,东张水库的浮游植物主要由蓝藻、绿藻和硅藻组成,其中蓝藻门为优势类群.东张水库2020年夏季浮游植物的密度在1.26×10^(7)~4.75×10^(7)L^(-1),共检出浮游植物6门28属;2021年夏季浮游植物的密度在2.06×10^(7)~5.45×10^(7)L,共检出浮游植物5门19属.用浮游植物群落特征指数对东张水库进行了综合评价,东张水库整体处于中度污染状态.浮游植物密度受多种环境因子的影响.Spearman相关性分析显示:浮游植物总密度与总磷浓度呈极显著正相关(P<0.01),与总氮浓度呈显著正相关(P<0.05).应用浮游植物完整性指数(phytoplanktonic index of biotic integrity,P-IBI)评价东张水库健康状况,结果显示,2020年夏季东张水库的健康状况为一般;2021年夏季东张水库的健康状况为较差.展开更多
基金sponsored by the Subordinate subject of the National Major Science and Technology Project“Development of Large Oil and Gas Fields and coalbed methane”(2017ZX05001-003)supported by the Science Research Project from CNPC(2019D-0708)supported by the National Natural Science Foundation of China"Quantitative evaluation of sealing capacity of fault rocks with diff erent structures in clastic strata”(41872153).
文摘Fault zones have always drawn attention from the industry,and the performance of a quantitative interpretation of the fault interior structure on seismic data has remained as a big challenge.In this work,we focus on quantitatively populating the heterogeneity of the fault interior structure in a three-dimensional space on seismic data.To realize this goal,we take the South Wuerxun sub-depression in Hailar Basin as an example of a faulted basin.First,based on a heterogeneity analysis using the drilling and logging information from wells,we establish fault zone geologic models and perform seismic forward modeling to determine the relationship between different fault zone models with different fault dips,internal fillings,and P wave responses.Next,the fault interior structure index(FIS)is constructed,and the response features on the FIS from the fault facies and the host rock are observed.Finally,the FIS is applied to perform the quantitative interpretation and prediction of the heterogeneity in the FIS on seismic data.The results show that the FIS response from the fault zone is higher than that of the host rock in plane,indicating that the former is quantitatively separated from the surrounding host rocks.The FIS values greater than 26 represent the feedback from the fault facies,whereas those less than 26 represent the response from the host rocks.The FIS shows segmented features in the strike,banded in dip on plane.On the slip surface,the FIS indicates the shale smear zone and the location where low-graded and small-scaled faults are densely developed.The heterogeneity prediction result is proven by oil and gas exploration activities.The study results imply that the FIS could indicate a favorable path of the hydrocarbon migration in the fault zone and evaluate the fault sealing parts.The method can explore the quantitative characterization of fault facies and has essential popularization and application values in similar geological application fi elds,including hydrocarbon exploration,development of faulted reservoirs,and geological engineering evaluation related to faults.
基金sponsored by the Subordinate subject of the National Major Science and Technology Project“Development of Large Oil and Gas Fields and coalbed methane”(2017ZX05001-003)supported by the National Natural Science Foundation of China”Simulation of Dynamic Process for Shale Oil Sweet Deposition in Lucaogou Formation,Jimusar Sag”(42072119).
文摘分别于2020和2021年夏季(7-8月)对福建省东张水库的进口、库心和出口3个断面进行水样采集.结果显示,东张水库的浮游植物主要由蓝藻、绿藻和硅藻组成,其中蓝藻门为优势类群.东张水库2020年夏季浮游植物的密度在1.26×10^(7)~4.75×10^(7)L^(-1),共检出浮游植物6门28属;2021年夏季浮游植物的密度在2.06×10^(7)~5.45×10^(7)L,共检出浮游植物5门19属.用浮游植物群落特征指数对东张水库进行了综合评价,东张水库整体处于中度污染状态.浮游植物密度受多种环境因子的影响.Spearman相关性分析显示:浮游植物总密度与总磷浓度呈极显著正相关(P<0.01),与总氮浓度呈显著正相关(P<0.05).应用浮游植物完整性指数(phytoplanktonic index of biotic integrity,P-IBI)评价东张水库健康状况,结果显示,2020年夏季东张水库的健康状况为一般;2021年夏季东张水库的健康状况为较差.
