百色盆地古近系那读组和百岗组层序地层划分与沉积演化
|
摘要
野外剖面显示百色盆地古近系那读组内部、那读组与百岗组之间存在不整合面。综合分析地震、测井等资料,将盆地古近系那读组和百岗组划分为1个二级层序,3个三级层序。那读组那三段构成三级层序的层序Ⅰ,那读组那二和那一段构成三级层序的层序Ⅱ,百岗组构成三级层序的层序Ⅲ。层序Ⅰ和层序Ⅱ是盆地断陷期的沉积,具有相似的充填特征,层序Ⅲ是盆地坳陷期的沉积。层序Ⅱ既发育厚度大、分布范围广的深湖亚相泥岩,又发育河流相、三角洲相和扇三角洲相砂岩,是盆地内主要的生储盖组合发育层序。盆地北部层序Ⅱ,Ⅲ发育的扇三角洲是盆地有利储集岩。各层序低水位体系域发育长轴分布的河流相和三角洲相砂岩,这些砂岩是盆地隐蔽性圈闭勘探的有利储层。
The outcrops indicate that the unconformity boundaries exist in the interior of Nadu formation and between Nadu formation and Baigang formation of the Paleogene in Baise Basin. Based on the analysis of seismic data and well logs,the Nadu formation and Baigang formation of the Paleogene can be divided into one second-order sequence, and three third-order sequences. The member 3 of the Nadu formation forms sequence stratigraphy Ⅰ, the members 2 and 1 of the Nadu formation form sequence stratigraphy Ⅱ, and Baigang formation forms sequence stratigraphy Ⅲ. Sequence stratigraphy Ⅰ and Ⅱ are deposited during faulted period, and sequence stratigraphy Ⅲ is deposited during depreesion period. Sequence stratigraphy Ⅱ contains not only mudstonds of deep-lake subfacies with large thickness and wide distribution, but also rich sandstones of fluvial facies, fan delta facies, delta facies, and is the main sequence with source-reservoir-caprock assemblage combination. The sandstones of fan delta facies deposited in the north of the basin are available reservoirs. The long-axial widely distributed sandstones of fluvial facies and delta facies developed in the lowstand systems tract of each sequence are the potential reservoirs for hydrocarbon exploration of subtle traps.
The outcrops indicate that the unconformity boundaries exist in the interior of Nadu formation and between Nadu formation and Baigang formation of the Paleogene in Baise Basin. Based on the analysis of seismic data and well logs,the Nadu formation and Baigang formation of the Paleogene can be divided into one second-order sequence, and three third-order sequences. The member 3 of the Nadu formation forms sequence stratigraphy Ⅰ, the members 2 and 1 of the Nadu formation form sequence stratigraphy Ⅱ, and Baigang formation forms sequence stratigraphy Ⅲ. Sequence stratigraphy Ⅰ and Ⅱ are deposited during faulted period, and sequence stratigraphy Ⅲ is deposited during depreesion period. Sequence stratigraphy Ⅱ contains not only mudstonds of deep-lake subfacies with large thickness and wide distribution, but also rich sandstones of fluvial facies, fan delta facies, delta facies, and is the main sequence with source-reservoir-caprock assemblage combination. The sandstones of fan delta facies deposited in the north of the basin are available reservoirs. The long-axial widely distributed sandstones of fluvial facies and delta facies developed in the lowstand systems tract of each sequence are the potential reservoirs for hydrocarbon exploration of subtle traps.
引文
[1] 蔡舜天,郭亦秋.广西百色盆地石油地质概述[J].石油与天然气地质,1984,5(4):363-371.CAIShun tian,GUOYi qiu.AnoutlineofpetroleumgeologyofBaiseBasin[J].Oil＆GasGeology,1984,5(4):363-371.
[2] 吴崇筠.中国中—新生代湖相沉积[A].冯增昭,王英华,刘焕杰,等.中国沉积学[C].北京:石油工业出版社,1994.438-439.
[3] 威尔格斯著.层序地层学原理[M].徐怀大,等译.北京:石油工业出版社,1993.49-55.
[4] 魏魁生,徐怀大.华北典型箕状断陷盆地的层序地层学模式及其油气赋存关系[J].地球科学,1993,18(2):139-149.WEIKui sheng,XUHuai da.Sequencestratigraghicmodelsandtheirrelationshiptooilandgasoccurrenceintypicalfaultedbasins,NorthernChina[J].EarthScience,1993,18(2):139-149.
[5] 姜在兴.层序地层学原理及应用[M].北京:石油工业出版社,1996.
[6] 纪友亮,张士奇,张宏,等.层序地层学原理及层序成因机制模式[M].北京:地质出版社,1998.
[7] 杨玉峰,李长山,孙德君,等.乌尔逊凹陷北部层序地层学研究[J].石油学报,1999,20(3):25-30.YANGYu feng,LIChang shan,SUNDe jun,etal.ApproachesofsequencestratigraphyintheNorthernWuerxunsag,HailaerBasin[J].ActaPetroleiSinica,1999,20(3):25-30.
[8] 张振生,黎英,王冰.冀中坳陷陆相地层层序地层学的应用[J].石油学报,1997,18(2):26-33.ZHANGZhen sheng,LIYing,WANGBing.AnapplicationofsequencestratigraphyincontinentaldepositofJizhongDepression[J].ActaPetroleiSinica,1997,18(2):26-33.
[9] 李思田,林畅松,解习农,等.大型陆相盆地层序地层学研究[J].地学前缘,1995,2(3-4):133-136.LISi tian,LINChang song,XIEXi nong,etal.Studyonsequencestratigraphyoflargecontinentalbasin[J].EarthScienceFrontiers,1995,2(3-4):133-136.
[10] 彭军,郑荣才,陈景山.百色盆地那读组层序分析与生储盖组合[J].沉积学报,2002,20(1):106-111.PENGJun,ZHENGRong cai,CHENJing shan.Sequenceanalysisandsource reservoir caprockassociationsofNaduformationinBaiseBasin[J].ActaSedimentologicaSinica,2002,20(1):106-111.
[11] 彭军,郑荣才,陈景山,等.百色盆地那读组短期基准面旋回层序分析[J].沉积学报,2002,20(2):203-209.PENGJun,ZHENGRong cai,CHENJing shan,etal.Short termbase levelcyclesequenceanalysisofNaduformationinBaiseBasin[J].ActaSedimentologicaSinica,2002,20(2):203-209
[2] 吴崇筠.中国中—新生代湖相沉积[A].冯增昭,王英华,刘焕杰,等.中国沉积学[C].北京:石油工业出版社,1994.438-439.
[3] 威尔格斯著.层序地层学原理[M].徐怀大,等译.北京:石油工业出版社,1993.49-55.
[4] 魏魁生,徐怀大.华北典型箕状断陷盆地的层序地层学模式及其油气赋存关系[J].地球科学,1993,18(2):139-149.WEIKui sheng,XUHuai da.Sequencestratigraghicmodelsandtheirrelationshiptooilandgasoccurrenceintypicalfaultedbasins,NorthernChina[J].EarthScience,1993,18(2):139-149.
[5] 姜在兴.层序地层学原理及应用[M].北京:石油工业出版社,1996.
[6] 纪友亮,张士奇,张宏,等.层序地层学原理及层序成因机制模式[M].北京:地质出版社,1998.
[7] 杨玉峰,李长山,孙德君,等.乌尔逊凹陷北部层序地层学研究[J].石油学报,1999,20(3):25-30.YANGYu feng,LIChang shan,SUNDe jun,etal.ApproachesofsequencestratigraphyintheNorthernWuerxunsag,HailaerBasin[J].ActaPetroleiSinica,1999,20(3):25-30.
[8] 张振生,黎英,王冰.冀中坳陷陆相地层层序地层学的应用[J].石油学报,1997,18(2):26-33.ZHANGZhen sheng,LIYing,WANGBing.AnapplicationofsequencestratigraphyincontinentaldepositofJizhongDepression[J].ActaPetroleiSinica,1997,18(2):26-33.
[9] 李思田,林畅松,解习农,等.大型陆相盆地层序地层学研究[J].地学前缘,1995,2(3-4):133-136.LISi tian,LINChang song,XIEXi nong,etal.Studyonsequencestratigraphyoflargecontinentalbasin[J].EarthScienceFrontiers,1995,2(3-4):133-136.
[10] 彭军,郑荣才,陈景山.百色盆地那读组层序分析与生储盖组合[J].沉积学报,2002,20(1):106-111.PENGJun,ZHENGRong cai,CHENJing shan.Sequenceanalysisandsource reservoir caprockassociationsofNaduformationinBaiseBasin[J].ActaSedimentologicaSinica,2002,20(1):106-111.
[11] 彭军,郑荣才,陈景山,等.百色盆地那读组短期基准面旋回层序分析[J].沉积学报,2002,20(2):203-209.PENGJun,ZHENGRong cai,CHENJing shan,etal.Short termbase levelcyclesequenceanalysisofNaduformationinBaiseBasin[J].ActaSedimentologicaSinica,2002,20(2):203-209
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心