苏丹Sufyan油田Abu Gabra组层序地层特征与沉积微相研究
发布时间：2018-08-20 16:42
【摘要】：本文以高分辨率层序地层学、沉积学理论为指导,综合应用钻井岩心、录井、地震、测井等资料进行高分辨率地层学研究,并以区域沉积模式为指导,对沉积微相类型及分布规律进行识别,分析储层的平面、层内与层间的分布与非均质特征,为今后油田的下一步开发以及各项研究打了下坚实的基础。研究结果表明:(1)通过岩心、测井、地震等资料的综合分析,识别出Abu Gabra组顶与Bentiu组顶区域不整合面,对应Abu Sufyan凹陷第一裂陷期的超长期旋回,并在Abu Gabra组识别出两个沉积作用转换面和一个最大湖泛面,分为3个长期基准面旋回,从下到上依次为AG3旋回、AG2旋回和AG1旋回;16个中期基准面旋回,45个短期旋回,并且建立了Abu Sufyan凹陷Abu Gabra组高分辨率层序地层格架。(2)根据局部标志层和旋回特征,进一步将AbuGarba组划分为分流河道、决口扇、分流间湾、滨浅湖泥、水下分流河道、水下分流间湾和河口坝微相。对测井数据进行分析,建立测井相识别模式,并利用主成分分析法总结出可用于Abu Sufyan凹陷单井沉积微相识别模板,Abu Gabra组为小型三角洲,。(3)通过对沉积微相分布的分析,确定Abu Sufyan凹陷沉积模式,并编制优势储层沉积微相平面分布图,系统的分析了本区域沉积微相的分布。Abu Gabra组沉积时期湖平面经历扩张-收缩变化,其中AG2砂岩组沉积时期湖面扩张,三角洲呈退积,AG1砂岩组沉积时期湖面收缩,三角洲以进积为主。(4)对Abu Gabra组地层优势储层进行储层性质研究,进而对储层的平面及纵向非均质性进行了详细分析,Abu Gabra组储层含油层位主要分布在AG1d-1~AG2d-2小层,平面具有强非均质性,渗透率变异系数大于0.7、突进系数大于3。层间突进系数均小于3,变异系数小于0.7,层间非均质弱。
[Abstract]:Guided by high-resolution sequence stratigraphy and sedimentology theory, this paper comprehensively applies drilling core, logging, seismic and logging data to carry out high-resolution stratigraphic research, and identifies sedimentary microfacies types and distribution rules under the guidance of regional sedimentary patterns, and analyzes reservoir plane, intra-layer and inter-layer distribution and heterogeneity characteristics. The results show that: (1) Through the comprehensive analysis of core, logging and seismic data, the unconformity surface between the top of Abu Gabra formation and the top of Bentiu formation is identified, which corresponds to the ultra-long-term cycle of the first rift period in Abu Sufyan sag, and two subsidences are identified in Abu Gabra formation. There are three long-term base-level cycles, AG3, AG2 and AG1, 16 medium-term base-level cycles and 45 short-term cycles, and the high-resolution sequence stratigraphic framework of Abu Gabra Formation in Abu Sufyan sag is established. (2) According to the characteristics of local marker and cycle, the high-resolution sequence stratigraphic framework of Abu Gabra Formation in Abu Sufyan sag will be further developed. Abu Garba Formation is divided into distributary channel, crevasse fan, distributary bay, shore-shallow lake mud, underwater distributary channel, underwater distributary Bay and estuary bar microfacies. Logging data are analyzed, logging facies recognition model is established, and single-well sedimentary microfacies identification template for Abu Sufyan sag is summarized by principal component analysis. Abu Gabra Formation is a small three-well. (3) By analyzing the distribution of sedimentary microfacies, the sedimentary model of Abu Sufyan depression is determined, and the planar distribution map of dominant reservoir sedimentary microfacies is compiled. The distribution of sedimentary microfacies in this area is systematically analyzed. (4) Reservoir properties of Abu Gabra formation are studied, and then the horizontal and vertical heterogeneity of the reservoir are analyzed in detail. The oil-bearing layers of Abu Gabra formation are mainly distributed in AG1d-1~AG2d-2 small layers, with strong heterogeneity in the plane and variable permeability. The coefficient of difference is greater than 0.7 and the coefficient of inrush is greater than 3. The coefficients of interlayer inrush are less than 3, the coefficient of variation is less than 0.7, and the interlayer heterogeneity is weak.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.13
，
本文编号：2194309
[Abstract]:Guided by high-resolution sequence stratigraphy and sedimentology theory, this paper comprehensively applies drilling core, logging, seismic and logging data to carry out high-resolution stratigraphic research, and identifies sedimentary microfacies types and distribution rules under the guidance of regional sedimentary patterns, and analyzes reservoir plane, intra-layer and inter-layer distribution and heterogeneity characteristics. The results show that: (1) Through the comprehensive analysis of core, logging and seismic data, the unconformity surface between the top of Abu Gabra formation and the top of Bentiu formation is identified, which corresponds to the ultra-long-term cycle of the first rift period in Abu Sufyan sag, and two subsidences are identified in Abu Gabra formation. There are three long-term base-level cycles, AG3, AG2 and AG1, 16 medium-term base-level cycles and 45 short-term cycles, and the high-resolution sequence stratigraphic framework of Abu Gabra Formation in Abu Sufyan sag is established. (2) According to the characteristics of local marker and cycle, the high-resolution sequence stratigraphic framework of Abu Gabra Formation in Abu Sufyan sag will be further developed. Abu Garba Formation is divided into distributary channel, crevasse fan, distributary bay, shore-shallow lake mud, underwater distributary channel, underwater distributary Bay and estuary bar microfacies. Logging data are analyzed, logging facies recognition model is established, and single-well sedimentary microfacies identification template for Abu Sufyan sag is summarized by principal component analysis. Abu Gabra Formation is a small three-well. (3) By analyzing the distribution of sedimentary microfacies, the sedimentary model of Abu Sufyan depression is determined, and the planar distribution map of dominant reservoir sedimentary microfacies is compiled. The distribution of sedimentary microfacies in this area is systematically analyzed. (4) Reservoir properties of Abu Gabra formation are studied, and then the horizontal and vertical heterogeneity of the reservoir are analyzed in detail. The oil-bearing layers of Abu Gabra formation are mainly distributed in AG1d-1~AG2d-2 small layers, with strong heterogeneity in the plane and variable permeability. The coefficient of difference is greater than 0.7 and the coefficient of inrush is greater than 3. The coefficients of interlayer inrush are less than 3, the coefficient of variation is less than 0.7, and the interlayer heterogeneity is weak.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.13
，
本文编号：2194309
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