直罗油田西北地区长2储层特征及分类评价
发布时间：2018-11-02 20:23
【摘要】：直罗油田位于鄂尔多斯盆地内部的陕北斜坡构造单元上,前期的勘探开发表明该区延长组储层物性差,油气分布主要受沉积相带、成岩作用、储层物性等因素控制。针对这一状况,本文以沉积岩石学、储层地质学、石油地质学、地球物理测井等相关理论为指导,结合多元统计学的研究方法,以目前先进的实验测试手段为依托,应用地质露头、钻井、测井等资料,采取宏观与微观相结合的研究方法,对直罗油田西北部延长组长2储层特征进行详细研究。综合研究认为区域构造较为平缓,有一些低缓的鼻状隆起,地层厚度较为稳定,变化不大。区内物源主要来自北东方向,各时期的河道都具有北东-南西向展布的特征,长2以三角洲前缘沉积为主,沉积亚相类型主要有水下分流河道,分流河道侧翼,分流间湾等,长21,长22小层砂体最为发育,长23在研究区钻遇率低,且以泥质分流间湾为主。长2储层砂岩主要为岩屑长石砂岩和长石砂岩,碎屑组成主要为石英、长石、岩屑、云母等,填隙物组分总体含量比较高,胶结物以绿泥石膜为主。砂岩的成分成熟度比较低,结构成熟度达到中等,分选比较好,磨圆主要为次棱角状。砂岩碎屑颗粒之间主要为点-线接触,胶结类型以孔隙式胶结为主。储层多发育残余粒间孔隙、粒间溶孔、粒内溶孔。长2孔隙度平均为12.57%,渗透率平均为2.50×10-3μm2。本次选用Q型因子分析和聚类分析的多元统计学方法进行储层分类与评价,这种定量的储层评价方法与以往定性的储层评价方法相比,从客观数据出发,有效避免了主观因素的干扰,每一个评价因子都附有权重系数,同时给出了综合因子得分公式,即储层评价模型,对研究区有很好的适用性。分类结果将研究区长2储层划分为3类:Ⅰ类(好储层)、Ⅱ类(中等储层)、Ⅲ类(无效储层)。综合来看,Ⅰ类,Ⅲ类储层在研究区发育较少,仅在长2储层个别地区发育,Ⅱ类储层在研究区内分布最为广泛。
[Abstract]:Zhiluo Oilfield is located in the structural unit of northern Shaanxi slope in Ordos Basin. The early exploration and development show that the reservoir physical property of Yanchang formation in this area is poor, and the distribution of oil and gas is mainly controlled by sedimentary facies zone, diagenesis, reservoir physical property and so on. In view of this situation, based on the relevant theories of sedimentary petrology, reservoir geology, petroleum geology, geophysical logging and so on, combined with the research methods of multivariate statistics, this paper relies on the advanced experimental testing methods. Based on the geological outcrop, drilling and logging data, the characteristics of Yanchang 2 reservoir in northwestern Zhiluo Oilfield are studied in detail by combining macroscopic and microcosmic research methods. It is considered that the regional structure is relatively smooth, there are some low slow rhinoid uplift, the formation thickness is relatively stable, and the change is not obvious. The source of material in this area mainly comes from the north to east direction, and the channel in each period has the characteristics of NE-NW distribution, Chang 2 is dominated by delta front sedimentation, the sedimentary subfacies are mainly subaqueous distributary channel, distributary channel flank, distributary bay and so on. The sand body of Chang 21 and Chang 22 is the most developed, and Chang 23 has a low drilling rate in the study area, and is dominated by muddy distributary bay. The sandstone of Chang 2 reservoir is mainly lithic feldspar sandstone and feldspar sandstone, and the clastic composition is mainly quartz, feldspar, lithic debris, mica, etc. The composition maturity of sandstone is low, the structure maturity is medium, the sorting is better, and the grinding circle is mainly sub-angled. The sandstone clastic grains are mainly point-line contact, and the type of cementation is pore cementation. The reservoir develops residual intergranular pores, intergranular dissolved pores, and intragranular dissolved pores. The average porosity of Chang 2 is 12.57 and the average permeability is 2.50 脳 10 ~ (-3) 渭 m ~ (2). The multivariate statistical method of Q type factor analysis and cluster analysis is used for reservoir classification and evaluation. This quantitative reservoir evaluation method is compared with the previous qualitative reservoir evaluation method, starting from the objective data. It can avoid the interference of subjective factors effectively, and each evaluation factor has weight coefficient. At the same time, the comprehensive factor score formula, that is, reservoir evaluation model, is given, which has good applicability to the study area. According to the classification results, Chang2 reservoir in the study area can be divided into three categories: class 鈪，
本文编号：2306857
[Abstract]:Zhiluo Oilfield is located in the structural unit of northern Shaanxi slope in Ordos Basin. The early exploration and development show that the reservoir physical property of Yanchang formation in this area is poor, and the distribution of oil and gas is mainly controlled by sedimentary facies zone, diagenesis, reservoir physical property and so on. In view of this situation, based on the relevant theories of sedimentary petrology, reservoir geology, petroleum geology, geophysical logging and so on, combined with the research methods of multivariate statistics, this paper relies on the advanced experimental testing methods. Based on the geological outcrop, drilling and logging data, the characteristics of Yanchang 2 reservoir in northwestern Zhiluo Oilfield are studied in detail by combining macroscopic and microcosmic research methods. It is considered that the regional structure is relatively smooth, there are some low slow rhinoid uplift, the formation thickness is relatively stable, and the change is not obvious. The source of material in this area mainly comes from the north to east direction, and the channel in each period has the characteristics of NE-NW distribution, Chang 2 is dominated by delta front sedimentation, the sedimentary subfacies are mainly subaqueous distributary channel, distributary channel flank, distributary bay and so on. The sand body of Chang 21 and Chang 22 is the most developed, and Chang 23 has a low drilling rate in the study area, and is dominated by muddy distributary bay. The sandstone of Chang 2 reservoir is mainly lithic feldspar sandstone and feldspar sandstone, and the clastic composition is mainly quartz, feldspar, lithic debris, mica, etc. The composition maturity of sandstone is low, the structure maturity is medium, the sorting is better, and the grinding circle is mainly sub-angled. The sandstone clastic grains are mainly point-line contact, and the type of cementation is pore cementation. The reservoir develops residual intergranular pores, intergranular dissolved pores, and intragranular dissolved pores. The average porosity of Chang 2 is 12.57 and the average permeability is 2.50 脳 10 ~ (-3) 渭 m ~ (2). The multivariate statistical method of Q type factor analysis and cluster analysis is used for reservoir classification and evaluation. This quantitative reservoir evaluation method is compared with the previous qualitative reservoir evaluation method, starting from the objective data. It can avoid the interference of subjective factors effectively, and each evaluation factor has weight coefficient. At the same time, the comprehensive factor score formula, that is, reservoir evaluation model, is given, which has good applicability to the study area. According to the classification results, Chang2 reservoir in the study area can be divided into three categories: class 鈪，
本文编号：2306857
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