卫城油田卫22断块精细地质模型与剩余油分布研究
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摘要
针对卫城油田卫22断块厚层块状非均质油藏的地质特点和开发现状,综合应用各种勘探开发资料,以石油地质学、现代沉积学、储层地质学、开发地质学等学科理论为指导,运用高分辨率层序地层学、储层评价技术、油藏三维地质建模技术、油藏数值模拟技术等现代油藏描述技术和方法,以计算机技术为手段,对卫城油田卫22断块进行了精细油藏描述和剩余油分布研究。
利用三维地震、钻井和生产动态等资料对该区进行了构造精细研究,编制了油藏剖面图和大比例尺小间距等值线的微构造图,逐步搞清了区内小断层的发育分布规律和小幅度微构造的分布特征。运用高分辨层序地层学的原理和方法,通过基准面旋回对比,建立了高分辨率层序地层格架。在骨架剖面对比的基础上,完成了该区小层的划分与对比,将卫22断块地层划分为2个长期基准面旋回,4个中期基准面旋回,10个短期基准面旋回,为储层的精细描述、建模奠定了基础。在前人研究的基础上,通过岩心观察、沉积背景和沉积特征的分析,进行了储层沉积微相研究,认为卫22断块发育水进式三角洲沉积,该区位于三角洲前缘相带。沉积微相主要为分流河道、河口沙坝、前缘沙席、河道间和浅湖相,储积砂体以分流河道和河口沙坝砂体为主,前缘沙席次之。通过对储层物性的综合评价认为卫22断块为严重非均质的中低渗透储层,各个小层中孔隙度和渗透率的变化受沉积相带控制,层间、层内矛盾突出是开发生产面临的主要矛盾。
综合以上研究成果,采用多信息协同和随机建模的方法建立了卫城油田卫22断块的三维储层地质模型。根据沉积微相的空间展布特征,运用序贯指示模拟方法,建立了沉积微相模型；运用相控建模技术和序贯高斯模拟方法,建立了孔隙度模型、渗透率模型,并进行了原始地质储量拟合。在石油地质储量计算基础上,对卫22断块油藏进行了数值模拟研究,并在此基础上开展了该油藏的剩余油分布及定量描述研究,分析了剩余油的分布特征,认为油藏的可动油高值区域一般存在于砂岩尖灭区、井网不完善区和构造高部位,并大多呈分散状、片状、连续状分布。
Considering the geological characteristics and development of thick and heterogeneous block reservoir of Wei22 in Weicheng oil field, applying exploration and development data, guided by the theory of petroleum geology, sedimentology, reservoir geology and development geology, adopting the technical means of high-resolution sequence stratigraphy, reservoir 3D modeling, reservoir evaluation and reservoir numerical simulation, fine description and distribution of the remaining oil of block reservoir of Wei22 in Weicheng oil-field have been studied.
Based on the research of the tectonic formation and evolution, applying computer and 3D visual modeling technology, the fine structural of block reservoir of Wei22 has been studied. According to present reservoir sectional drawing and a large-scale, small gap contour micro tectonic graph in this paper, the minor fault growing distribution and low-amplitude micro tectonic are discussed and recognized. Applying high resolution sequence stratigraphy, the high resolution sequence stratigraphy hack is concluded. Comparing the framework profile, block reservoir of Wei22 is divided into 2 long-term,4 medium-term cycles and 10 short-term cycles. This is very helpful for fine reservoir description. Analyzing the background and characteristics of sedimentary and core, the microfacies of the formation is studied. The conclusion is that this area is at the frontal delta zone, microfacies are mainly distributary channel, mouth bar, inter-channels, sand sheet, offshore bar sand and shallow-lake facies. The main reservoir sand is the sand of river and mouth bar, and the rest is sand sheet. According to the compositive valuation of reservoir quality, block reservoir of Wei22 is a strongly heterogeneity and low permeability reservoir. The porosity and permeability are mainly controlled by the depositional microfacies. The intrastratal anisotropy and interformational anisotropy are serious, which is the main task for development.
Adopting multi-information cooperation and stochastic modeling method, the 3D reservoir models are built up. Based on the distribution of the depositional microfacies and the sequential indicator simulation, the depositional microfacies model is built up. Utilizing the facies-controlled and sequential Gauss simulation method, the attribute parameter model is built up. At last, the original geological reserves are calculated. Calculating the geology reserves, the single layer is evaluated on reserves and the quality and semi-quantity research on macro remaining oil is discussed. On the research of macro and micro remaining oil, the reservoir numerical simulation, quantitative research and distribution of remaining oil are discussed, the further development is proposed. This research suggested that the movable oil high value region exists generally in the sand pinchout area, the well pattern imperfect area and constructs the high spot, and mostly assumes the dispersion shape, laminated, the continual shape distribution.
利用三维地震、钻井和生产动态等资料对该区进行了构造精细研究,编制了油藏剖面图和大比例尺小间距等值线的微构造图,逐步搞清了区内小断层的发育分布规律和小幅度微构造的分布特征。运用高分辨层序地层学的原理和方法,通过基准面旋回对比,建立了高分辨率层序地层格架。在骨架剖面对比的基础上,完成了该区小层的划分与对比,将卫22断块地层划分为2个长期基准面旋回,4个中期基准面旋回,10个短期基准面旋回,为储层的精细描述、建模奠定了基础。在前人研究的基础上,通过岩心观察、沉积背景和沉积特征的分析,进行了储层沉积微相研究,认为卫22断块发育水进式三角洲沉积,该区位于三角洲前缘相带。沉积微相主要为分流河道、河口沙坝、前缘沙席、河道间和浅湖相,储积砂体以分流河道和河口沙坝砂体为主,前缘沙席次之。通过对储层物性的综合评价认为卫22断块为严重非均质的中低渗透储层,各个小层中孔隙度和渗透率的变化受沉积相带控制,层间、层内矛盾突出是开发生产面临的主要矛盾。
综合以上研究成果,采用多信息协同和随机建模的方法建立了卫城油田卫22断块的三维储层地质模型。根据沉积微相的空间展布特征,运用序贯指示模拟方法,建立了沉积微相模型；运用相控建模技术和序贯高斯模拟方法,建立了孔隙度模型、渗透率模型,并进行了原始地质储量拟合。在石油地质储量计算基础上,对卫22断块油藏进行了数值模拟研究,并在此基础上开展了该油藏的剩余油分布及定量描述研究,分析了剩余油的分布特征,认为油藏的可动油高值区域一般存在于砂岩尖灭区、井网不完善区和构造高部位,并大多呈分散状、片状、连续状分布。
Considering the geological characteristics and development of thick and heterogeneous block reservoir of Wei22 in Weicheng oil field, applying exploration and development data, guided by the theory of petroleum geology, sedimentology, reservoir geology and development geology, adopting the technical means of high-resolution sequence stratigraphy, reservoir 3D modeling, reservoir evaluation and reservoir numerical simulation, fine description and distribution of the remaining oil of block reservoir of Wei22 in Weicheng oil-field have been studied.
Based on the research of the tectonic formation and evolution, applying computer and 3D visual modeling technology, the fine structural of block reservoir of Wei22 has been studied. According to present reservoir sectional drawing and a large-scale, small gap contour micro tectonic graph in this paper, the minor fault growing distribution and low-amplitude micro tectonic are discussed and recognized. Applying high resolution sequence stratigraphy, the high resolution sequence stratigraphy hack is concluded. Comparing the framework profile, block reservoir of Wei22 is divided into 2 long-term,4 medium-term cycles and 10 short-term cycles. This is very helpful for fine reservoir description. Analyzing the background and characteristics of sedimentary and core, the microfacies of the formation is studied. The conclusion is that this area is at the frontal delta zone, microfacies are mainly distributary channel, mouth bar, inter-channels, sand sheet, offshore bar sand and shallow-lake facies. The main reservoir sand is the sand of river and mouth bar, and the rest is sand sheet. According to the compositive valuation of reservoir quality, block reservoir of Wei22 is a strongly heterogeneity and low permeability reservoir. The porosity and permeability are mainly controlled by the depositional microfacies. The intrastratal anisotropy and interformational anisotropy are serious, which is the main task for development.
Adopting multi-information cooperation and stochastic modeling method, the 3D reservoir models are built up. Based on the distribution of the depositional microfacies and the sequential indicator simulation, the depositional microfacies model is built up. Utilizing the facies-controlled and sequential Gauss simulation method, the attribute parameter model is built up. At last, the original geological reserves are calculated. Calculating the geology reserves, the single layer is evaluated on reserves and the quality and semi-quantity research on macro remaining oil is discussed. On the research of macro and micro remaining oil, the reservoir numerical simulation, quantitative research and distribution of remaining oil are discussed, the further development is proposed. This research suggested that the movable oil high value region exists generally in the sand pinchout area, the well pattern imperfect area and constructs the high spot, and mostly assumes the dispersion shape, laminated, the continual shape distribution.
引文
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