白豹油田白209区长6_3储层特征与三维地质建模研究
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摘要
鄂尔多斯盆地上三叠统延长组储层是典型的低孔低渗、低孔特低渗储层。近年来,在对低渗透储层的勘探开发过程中发现了相对优质的储层,白豹油田白209井区长6_3储层就是其中之一。为了更加客观真实的认识储层地质特征,预测相对优质储层的空间展布和剩余油的分布规律,制定合理开发方案以提高采收率,为高效合理的开发油藏提供理论依据、研究方法和技术支持等,因此开展储层特征和三维地质建模研究有着重要的实际意义。
本文以白209井区长6_3油藏的区域地质背景为出发点,针对区内储层物性差、非均质性强的特点,以石油地质学、构造地质学、沉积学等理论为指导,以层序地层学、储层地质学、油藏开发地质学、测井地质学等为方法,综合应用地质、测井、测试、分析化验以及开发动态等多种资料对研究区内储层的地质特征进行深入剖析。在前人研究的基础上,通过高分辨率层序地层学和传统岩相厚度法相结合,准确的建立了地层等时格架;通过岩心相和测井相结合分析本区的沉积特征、纵向上相的演化及平面上微相的展布规律;在此基础上从低渗透储层的地质特征出发,在“四性”关系研究的基础上,建立了地质条件约束的测井解释模型,据此对区内182口井进行了单井测井综合解释及多井评价;应用多种分析化验资料对长6_3储层的微观特征进行了细致的研究;利用岩心分析资料从不同角度对储层的非均质性做了定量描述;针对本区岩性油气藏的特点,选取影响流体渗流特征最有代表性的参数孔隙度和渗透率划分出4类流动单元。在上述工作的基础上,通过对不同地质建模方法的分析,选择适合研究区地质特征的建模方法,建立了构造模型、相模型和相控属性模型,从而建立了能够客观反映长6_3油藏地质特征的定量化三维地质模型。
The reservoir of Yanchang formation of Upper Triassic in Ordos Basin is well known as low porosity, low permeability, and extra-low permeability. In recent years, favorable reservoirs for low permeability have been discovered in the process of exploration and development, and Chang 6_3 reservoir of Bai 209 well field in BaiBao oil field is such the case. In the order to have an objective and true understanding of geologic characteristic of reservoir, predict the three-dimensional distribution of favorable reservoir and oil remaining, draw up reasonable oilfield development plan so as to enhance crude petroleum, offer theoretical basis, research methods and techniques assistance for high-efficient exploration, it is of great significance to study geological characteristics and 3-D geology modeling.
According to regional geological background of Chang 6_3 reservoir in Bai 209 well field, aiming at bad petrophysical and high heterogeneity of reservoir, following the guidence of petroleum geology, structural geology and sedimentology, using sequence stratigraphy , reservoir geology and geophysical logging, this article will give an in-depth illustration to the geographic characteristics with the areas studied by means of using geology, logging, testing, analysis, production performance data and so on. Based on the former research work, it built the sequence-stratigraphy framework by the combination of the High-resolution sequence stratigraphy and the tradition cycle-thickness method. The characteristic of sedimentation and vertical evolution and planar distribution of micro-facies have been recognized by using the combination of drilling core facies and well logging facies. It is according to geological characteristics of low permeability reservoirs, based on the study of Four-property Correlation of reservoirs, the author establishes logging interpretation model constrained by geological characteristics and comprehensively interprets and evaluates more than 182 wells in this region. The microstructure of Chang 6_3 reservoir has been meticulously dealt with through various data from laboratory testing, and the heterogeneity has been quantitatively described by core analysis. Aiming at Chang 63 Oil Reservoir Set is lithologic oil reservoir, study on the flow unit was divided into 4 types based on porosity and permeability which influence the seepage features. On the basis of the above study, through analyzing various methods for geological modeling, choosing the modeling methods which suit the geologic characteristic in the area, the thesis set up geological model which include structure model, facies model and attribute model constrained by facies. Thus, the quantative geological model that could objectively show the geological characteristic of chang 63 oil reservoir will be established.
本文以白209井区长6_3油藏的区域地质背景为出发点,针对区内储层物性差、非均质性强的特点,以石油地质学、构造地质学、沉积学等理论为指导,以层序地层学、储层地质学、油藏开发地质学、测井地质学等为方法,综合应用地质、测井、测试、分析化验以及开发动态等多种资料对研究区内储层的地质特征进行深入剖析。在前人研究的基础上,通过高分辨率层序地层学和传统岩相厚度法相结合,准确的建立了地层等时格架;通过岩心相和测井相结合分析本区的沉积特征、纵向上相的演化及平面上微相的展布规律;在此基础上从低渗透储层的地质特征出发,在“四性”关系研究的基础上,建立了地质条件约束的测井解释模型,据此对区内182口井进行了单井测井综合解释及多井评价;应用多种分析化验资料对长6_3储层的微观特征进行了细致的研究;利用岩心分析资料从不同角度对储层的非均质性做了定量描述;针对本区岩性油气藏的特点,选取影响流体渗流特征最有代表性的参数孔隙度和渗透率划分出4类流动单元。在上述工作的基础上,通过对不同地质建模方法的分析,选择适合研究区地质特征的建模方法,建立了构造模型、相模型和相控属性模型,从而建立了能够客观反映长6_3油藏地质特征的定量化三维地质模型。
The reservoir of Yanchang formation of Upper Triassic in Ordos Basin is well known as low porosity, low permeability, and extra-low permeability. In recent years, favorable reservoirs for low permeability have been discovered in the process of exploration and development, and Chang 6_3 reservoir of Bai 209 well field in BaiBao oil field is such the case. In the order to have an objective and true understanding of geologic characteristic of reservoir, predict the three-dimensional distribution of favorable reservoir and oil remaining, draw up reasonable oilfield development plan so as to enhance crude petroleum, offer theoretical basis, research methods and techniques assistance for high-efficient exploration, it is of great significance to study geological characteristics and 3-D geology modeling.
According to regional geological background of Chang 6_3 reservoir in Bai 209 well field, aiming at bad petrophysical and high heterogeneity of reservoir, following the guidence of petroleum geology, structural geology and sedimentology, using sequence stratigraphy , reservoir geology and geophysical logging, this article will give an in-depth illustration to the geographic characteristics with the areas studied by means of using geology, logging, testing, analysis, production performance data and so on. Based on the former research work, it built the sequence-stratigraphy framework by the combination of the High-resolution sequence stratigraphy and the tradition cycle-thickness method. The characteristic of sedimentation and vertical evolution and planar distribution of micro-facies have been recognized by using the combination of drilling core facies and well logging facies. It is according to geological characteristics of low permeability reservoirs, based on the study of Four-property Correlation of reservoirs, the author establishes logging interpretation model constrained by geological characteristics and comprehensively interprets and evaluates more than 182 wells in this region. The microstructure of Chang 6_3 reservoir has been meticulously dealt with through various data from laboratory testing, and the heterogeneity has been quantitatively described by core analysis. Aiming at Chang 63 Oil Reservoir Set is lithologic oil reservoir, study on the flow unit was divided into 4 types based on porosity and permeability which influence the seepage features. On the basis of the above study, through analyzing various methods for geological modeling, choosing the modeling methods which suit the geologic characteristic in the area, the thesis set up geological model which include structure model, facies model and attribute model constrained by facies. Thus, the quantative geological model that could objectively show the geological characteristic of chang 63 oil reservoir will be established.
引文
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[13]王晖,赵建辉.油田开发方案设计阶段储集层地质模型的建立[J].石油勘探与开发,2001,28(3):83-85
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[23]宋万超,刘波,宋新民.层序地层学概念、原理、方法及应用[M].北京:石油工业出版社,2003,222-214
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