To solve the problems in restoring sedimentary facies and predicting reservoirs in loose gas-bearing sediment,based on seismic sedimentologic analysis of the first 9-component S-wave 3D seismic dataset of China,a four...To solve the problems in restoring sedimentary facies and predicting reservoirs in loose gas-bearing sediment,based on seismic sedimentologic analysis of the first 9-component S-wave 3D seismic dataset of China,a fourth-order isochronous stratigraphic framework was set up and then sedimentary facies and reservoirs in the Pleistocene Qigequan Formation in Taidong area of Qaidam Basin were studied by seismic geomorphology and seismic lithology.The study method and thought are as following.Firstly,techniques of phase rotation,frequency decomposition and fusion,and stratal slicing were applied to the 9-component S-wave seismic data to restore sedimentary facies of major marker beds based on sedimentary models reflected by satellite images.Then,techniques of seismic attribute extraction,principal component analysis,and random fitting were applied to calculate the reservoir thickness and physical parameters of a key sandbody,and the results are satisfactory and confirmed by blind testing wells.Study results reveal that the dominant sedimentary facies in the Qigequan Formation within the study area are delta front and shallow lake.The RGB fused slices indicate that there are two cycles with three sets of underwater distributary channel systems in one period.Among them,sandstones in the distributary channels of middle-low Qigequan Formation are thick and broad with superior physical properties,which are favorable reservoirs.The reservoir permeability is also affected by diagenesis.Distributary channel sandstone reservoirs extend further to the west of Sebei-1 gas field,which provides a basis to expand exploration to the western peripheral area.展开更多
该研究采用Illumina Mi Seq高通量测序技术对3份人工窖泥样品的微生物菌群多样性进行解析,并对优势菌属间的相关性进行分析。结果表明,人工窖泥中微生物组成丰富,优势细菌属(平均相对丰度>1%)为魏斯氏菌属(Weissella)、真杆菌属(Euba...该研究采用Illumina Mi Seq高通量测序技术对3份人工窖泥样品的微生物菌群多样性进行解析,并对优势菌属间的相关性进行分析。结果表明,人工窖泥中微生物组成丰富,优势细菌属(平均相对丰度>1%)为魏斯氏菌属(Weissella)、真杆菌属(Eubacterium)、新斯氏菌属(Neoscardovia)、片球菌属(Pediococcus)、芽孢杆菌属(Bacillus)、Caproicibacter、高温放线菌属(Thermoactinomyces)、棒状杆菌属(Corynebacterium)、真丝菌属(Planifilum)、狭义梭菌属(Clostridium sensu stricto)、肠球菌属(Enterococcus)、链霉菌属(Streptomyces)和联合乳杆菌属(Ligilactobacillus);优势真菌属(平均相对丰度>1%)为耐干霉菌属(Xeromyces)、曲霉属(Aspergillus)、节担菌属(Wallemia)、Trichomonascus、根霉属(Rhizopus)和毕赤酵母属(Pichia)。其中,Planifilum与Bacillus和Ligilactobacillus与Enterococcus的协同效应对人工窖泥品质有正向调节作用,而Aspergillus与Enterococcus、Thermoactinomyces及Pichia与Weissella之间存在显著的拮抗或竞争关系(P<0.05)。展开更多
Whether benthic macroalga can be an important type of bio-precursor of source rocks is a contentious issue in source-rock studies,and has not been well understood.This paper represents a case study of Jurassic mudston...Whether benthic macroalga can be an important type of bio-precursor of source rocks is a contentious issue in source-rock studies,and has not been well understood.This paper represents a case study of Jurassic mudstone source rocks from the northern Qaidam Basin,northwestern China,in which the benthic macro red algae were recognized for the first time based on combined organic petrological and biomarker works.We found not only cystocarps in the algae,representative of rhodophyta,but also diahopanes,which are diagnostic biomarkers of such algae.Thus,as many reservoired oils in the northern Qaidam Basin contain abundant diahopanes,it may indicate that the red algae have contributed to hydrocarbon accumulation.This was confirmed by integrated geological and geochemical analyses.Hence,this study provides new evidence for macroalga-generated hydrocarbons.展开更多
基金Supported by the CNPC Science and Technology Projects(2022-N/G-47808,2023-N/G-67014)RIPED International Cooperation Project(19HTY5000008).
文摘To solve the problems in restoring sedimentary facies and predicting reservoirs in loose gas-bearing sediment,based on seismic sedimentologic analysis of the first 9-component S-wave 3D seismic dataset of China,a fourth-order isochronous stratigraphic framework was set up and then sedimentary facies and reservoirs in the Pleistocene Qigequan Formation in Taidong area of Qaidam Basin were studied by seismic geomorphology and seismic lithology.The study method and thought are as following.Firstly,techniques of phase rotation,frequency decomposition and fusion,and stratal slicing were applied to the 9-component S-wave seismic data to restore sedimentary facies of major marker beds based on sedimentary models reflected by satellite images.Then,techniques of seismic attribute extraction,principal component analysis,and random fitting were applied to calculate the reservoir thickness and physical parameters of a key sandbody,and the results are satisfactory and confirmed by blind testing wells.Study results reveal that the dominant sedimentary facies in the Qigequan Formation within the study area are delta front and shallow lake.The RGB fused slices indicate that there are two cycles with three sets of underwater distributary channel systems in one period.Among them,sandstones in the distributary channels of middle-low Qigequan Formation are thick and broad with superior physical properties,which are favorable reservoirs.The reservoir permeability is also affected by diagenesis.Distributary channel sandstone reservoirs extend further to the west of Sebei-1 gas field,which provides a basis to expand exploration to the western peripheral area.
文摘该研究采用Illumina Mi Seq高通量测序技术对3份人工窖泥样品的微生物菌群多样性进行解析,并对优势菌属间的相关性进行分析。结果表明,人工窖泥中微生物组成丰富,优势细菌属(平均相对丰度>1%)为魏斯氏菌属(Weissella)、真杆菌属(Eubacterium)、新斯氏菌属(Neoscardovia)、片球菌属(Pediococcus)、芽孢杆菌属(Bacillus)、Caproicibacter、高温放线菌属(Thermoactinomyces)、棒状杆菌属(Corynebacterium)、真丝菌属(Planifilum)、狭义梭菌属(Clostridium sensu stricto)、肠球菌属(Enterococcus)、链霉菌属(Streptomyces)和联合乳杆菌属(Ligilactobacillus);优势真菌属(平均相对丰度>1%)为耐干霉菌属(Xeromyces)、曲霉属(Aspergillus)、节担菌属(Wallemia)、Trichomonascus、根霉属(Rhizopus)和毕赤酵母属(Pichia)。其中,Planifilum与Bacillus和Ligilactobacillus与Enterococcus的协同效应对人工窖泥品质有正向调节作用,而Aspergillus与Enterococcus、Thermoactinomyces及Pichia与Weissella之间存在显著的拮抗或竞争关系(P<0.05)。
基金Supported by National Natural Science Foundation of China (Grant Nos. 40602014, 40872086, 40638042)
文摘Whether benthic macroalga can be an important type of bio-precursor of source rocks is a contentious issue in source-rock studies,and has not been well understood.This paper represents a case study of Jurassic mudstone source rocks from the northern Qaidam Basin,northwestern China,in which the benthic macro red algae were recognized for the first time based on combined organic petrological and biomarker works.We found not only cystocarps in the algae,representative of rhodophyta,but also diahopanes,which are diagnostic biomarkers of such algae.Thus,as many reservoired oils in the northern Qaidam Basin contain abundant diahopanes,it may indicate that the red algae have contributed to hydrocarbon accumulation.This was confirmed by integrated geological and geochemical analyses.Hence,this study provides new evidence for macroalga-generated hydrocarbons.
