陕北定边张韩区长2油藏三维建模和剩余油分布研究
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摘要
本论文从定边张韩油区的实际情况出发,以研究宏观剩余油分布为目的,在对该油区进行构造特征、沉积微相特征、储层特征、油藏特征等油藏地质研究之后,建立了精细的储层三维模型,并以丰富的开发动态监测资料为基础,运用综合地质分析和井间监测动态分析方法对研究区宏观剩余油分布进行了研究,并提出了开发调整建议。本次研究主要取得了以下的成果和认识：对研究区地层进行了精细的划分与对比,将本区长2油层组划分为长21、长22、长23三个油层亚组,其中又将长21油层亚组划分为长21-1、长21-2、长21-3三个小层。根据区域沉积背景,结合相标志与前人研究成果,在确立长2为三角洲平原亚相的基础上,进一步将其分为水上分流河道等4个微相,并认为分流河道相为本区长2主要的储集砂体。在此分析基础上,分别绘制了砂岩厚度等值线图及砂地比等值线图,进而分析了3个小层的沉积相平面展布及演化规律。研究区长2储层为中-细粒长石砂岩、岩屑长石砂岩,孔隙类型主要为粒间孔和溶蚀孔隙。成岩作用主要有压实压溶作用,胶结作用和溶解作用。受成岩作用的影响,长2储层物性表现为中孔,低-特低渗,其中孔隙度平均值为15.88%,渗透率平均值为8.261×10-3μm2。孔喉组合类型主要为中孔中细喉型,此外成岩作用研究表明长2层段储层已处于晚成岩阶段A期。综合分析认为长2储层主要为Ⅰ类和Ⅱb类储层。圈闭类型主要是构造-岩性圈闭。研究区原油是具有低密度、中等粘度的常规陆相原油特征。地层水主要为CaCl2型。长2地温梯度约为2.49℃／100m。选用Petrel建模软件,采取相控随机建模的方法,在丰富的地质知识库的基础上,以沉积相、地质条件为约束,建立了研究区长21-1、长21-2、长21-3的三维地质模型,包括储层构造模型、岩相模型、孔隙度、渗透率和含油饱和度等属性模型。通过井间监测动态分析方法与综合地质分析方法,对研究区主力油层长21-1小层宏观剩余油分布进行了研究,绘制了长21-1小层宏观剩余油平面分布预测图,并提出了剩余油开发的调整建议。
Based on the current and actual situation of Dingbian Zhanghan aera, with the purpose of studying the distribution of remaining oil, by analyzing the structure, sedimentary microfacies, reservoir characters and oil reservoir characters, we found the fine 3D geological modeling, and based on the abundant dynamic monitoring data, using the dynamic oil-well monitoring analytic method and the comprehensive geological method, we analyze the distribution of macroscopical remaining oil in the study aera, and make some adjustment suggestions of oil region development. The following researching results and achievements are obtained in this paper:Through subtly stratigraphic correlation in the study aera, Chang 2 oil-bearing can be divided into Chang 21, Chang 22, Chang 23. Further more, Chang 21 can be divided into Chang 21-1,Chang 21-2 and Chang 21-3.Based on the regional sedimentary background, combined with facies indices and the formers'achievement in research, on the base of the fact that Chang2 belong to the distributary channel deposits of lake delta plain, further divided it into 4 micro-faces including distributary channel which is considered to be the main reservoirs of the area, and based on this, the the sand thickness maps and sedimentary micro-face maps have been established respectively, then analyzing the plane distribution and the regularity of microfacies of the three separate subzone.The Chang 2 reservoir in the study area is medium to fine arkose and lithic arkose. The main pore configuration are intergranular pore and emposieu pore. The main lithogenesis are compaction and pressure solution, cementation and dissolution. Effect of lithogenesis, the Chang2 sandstones is medium porosity, low-extremely low permeability, the average porosity is 15.88% and the average permeability is 8.261×10-3μm2. It is held that the pore throat structure is the type of medium pore and medium-fine throat. In addition, the study of diagenesis showed that the Chang2 reservoir diagenetic stage with late-diagenetic stage-A. Based on overall analysis,the results showed that the main type of reservoir are I and II b.The traps are mainly structure-lithology trap, oil in the study aera is the general continental crude oil with the characteristic of low density and moderately viscous, the formation water is mainly belong to chloride-calcium type. The Chang2 geothermal gradient is about 2.49℃/100m, which belong to normal temperature and pressure conditions.Making use of petrel software, using the methods of sediments cortrolling and random modeling, on the based of the abundant geological knowledge base, with the restriction of sedimentary facies and geological conditions, we established the 3-D geological modeling of Chang21-1, Chang21-2, Chang21-3 in the study aera, which including the structure model, the facies model, the attribute model of porosity、permeability and oil saturation.Using the dynamic oil-well monitoring analytic method and the comprehensive geological method, we analyzed the distribution of macroscopical remaining oil of main Reservoir-Chang21-1 subzone in the study aera, mapped the prediction diagrams of two-dimensional distribution of the macroscopical remaining oil of Chang21-1 in the aera, and make some adjustment suggestions of remaining oil region development.
Based on the current and actual situation of Dingbian Zhanghan aera, with the purpose of studying the distribution of remaining oil, by analyzing the structure, sedimentary microfacies, reservoir characters and oil reservoir characters, we found the fine 3D geological modeling, and based on the abundant dynamic monitoring data, using the dynamic oil-well monitoring analytic method and the comprehensive geological method, we analyze the distribution of macroscopical remaining oil in the study aera, and make some adjustment suggestions of oil region development. The following researching results and achievements are obtained in this paper:Through subtly stratigraphic correlation in the study aera, Chang 2 oil-bearing can be divided into Chang 21, Chang 22, Chang 23. Further more, Chang 21 can be divided into Chang 21-1,Chang 21-2 and Chang 21-3.Based on the regional sedimentary background, combined with facies indices and the formers'achievement in research, on the base of the fact that Chang2 belong to the distributary channel deposits of lake delta plain, further divided it into 4 micro-faces including distributary channel which is considered to be the main reservoirs of the area, and based on this, the the sand thickness maps and sedimentary micro-face maps have been established respectively, then analyzing the plane distribution and the regularity of microfacies of the three separate subzone.The Chang 2 reservoir in the study area is medium to fine arkose and lithic arkose. The main pore configuration are intergranular pore and emposieu pore. The main lithogenesis are compaction and pressure solution, cementation and dissolution. Effect of lithogenesis, the Chang2 sandstones is medium porosity, low-extremely low permeability, the average porosity is 15.88% and the average permeability is 8.261×10-3μm2. It is held that the pore throat structure is the type of medium pore and medium-fine throat. In addition, the study of diagenesis showed that the Chang2 reservoir diagenetic stage with late-diagenetic stage-A. Based on overall analysis,the results showed that the main type of reservoir are I and II b.The traps are mainly structure-lithology trap, oil in the study aera is the general continental crude oil with the characteristic of low density and moderately viscous, the formation water is mainly belong to chloride-calcium type. The Chang2 geothermal gradient is about 2.49℃/100m, which belong to normal temperature and pressure conditions.Making use of petrel software, using the methods of sediments cortrolling and random modeling, on the based of the abundant geological knowledge base, with the restriction of sedimentary facies and geological conditions, we established the 3-D geological modeling of Chang21-1, Chang21-2, Chang21-3 in the study aera, which including the structure model, the facies model, the attribute model of porosity、permeability and oil saturation.Using the dynamic oil-well monitoring analytic method and the comprehensive geological method, we analyzed the distribution of macroscopical remaining oil of main Reservoir-Chang21-1 subzone in the study aera, mapped the prediction diagrams of two-dimensional distribution of the macroscopical remaining oil of Chang21-1 in the aera, and make some adjustment suggestions of remaining oil region development.
引文
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