碳酸盐岩水淹层测井评价方法研究
发布时间：2019-04-21 19:38
【摘要】：L油田在开发过程存在油井水淹严重、注入水锥进方向不均一,水驱波及系数较低,这些问题的存在,造成部分油井开始投产就见水,油井产量低和产能低,油井的产量下降。为了抑制含水上升,减缓产量递减,迫切需要对地区的油藏进行深入研究,找出水淹与储层关系,建立L油田水淹层的定性识别方法、定量解释标准以及水淹锥进方式与储层关系的判别模式,进而对新开发井储层的水淹状况进行快速判断。找出油藏水淹的规律以及剩余油分布特性,预测剩余油富集区,为调剖堵水、提高采收率、调整油藏的开发方案等提供依据。目前国内外对砂泥岩水淹层测井解释研究很多,而在碳酸盐岩水淹层测井解释方面还没有一套完整的方法体系。此外,相比砂泥岩水淹层测井解释,碳酸盐岩水淹层测井解释需要考虑到裂缝对水淹规律及剩余油分布的影响。以L油田为研究对象,以水淹层测井解释为核心,结合碳酸盐岩特性,同时考虑裂缝在水淹过程的影响,从测井角度建立了碳酸盐岩水淹层解释的系统研究方法,为有效地进行高含水阶段剩余油分布预测探索了一条新途径。由于少量微裂缝的对渗流的影响,在含中低水淹时期,含水上升非常快。在对取心井资料分析发现,L油田在研究层段以孔隙型储层为主,发育少量微裂缝,因此,首先针对孔隙型储层运用定性、定量方法进行解释。①定性方法：结合生产动态资料分析测井资料,准确提取水淹层测井响应特征,制作定性模版来划分水淹层；通过反演原始地层电阻率及原始地层含油饱和度定性识别水淹层。②定量方法：通过计算三饱和度,建立含水率与驱油效率模型,定量划分水演级别,运用以上方法能有效识别水淹层。其次,在发育微裂缝的地方采用定性对比的方法进行水淹解释,分析取心井成像资料,总结出了裂缝发育段的常规测井响应特征,能有效识别出微裂缝发育层段,对这些层段通过井间对比达到定性识别水淹层的目的。结合以上所有方法,对水淹层具有很强的识别效果,达到要求的解释符合率,可以广泛应用于生产。
[Abstract]:The water flooding of oil well in L oilfield is serious, the direction of injection water coning is not uniform, and the sweep efficiency of water drive is low. These problems cause some oil wells to come into production and see water, the production and productivity of oil well are low, and the production of oil well is decreased. In order to restrain the rise of water cut and slow down the decline of production, it is urgent to deeply study the reservoir in the area, find out the relationship between water flooding and reservoir, and establish the qualitative identification method of water flooded zone in L oilfield. The standard of quantitative interpretation and the discriminant model of the relationship between the water-flooded coning mode and the reservoir can be used to judge the water-out status of the newly developed wells quickly. The rule of water flooding in reservoir and the distribution characteristics of remaining oil are found out, and the remaining oil enrichment area is predicted, which provides the basis for profile control and water plugging, improvement of oil recovery, adjustment of reservoir development plan and so on. At present, there are a lot of researches on logging interpretation of sand-mudstone watered-out zone at home and abroad, but there is no complete method system for logging interpretation of carbonate-rock watered-out zone. In addition, compared with logging interpretation of sand-mudstone water-flooded zone, the influence of fractures on water-flooded rule and remaining oil distribution should be considered in log interpretation of carbonate water-flooded zone. Taking L oilfield as the research object, taking logging interpretation of waterflooded zone as the core, combining the characteristics of carbonate rock and considering the influence of fracture in waterflooded process, the systematic research method of water flooded zone interpretation of carbonate rock is established from the logging point of view. In order to effectively predict the residual oil distribution in high water cut stage, a new approach has been explored. Due to the influence of a small amount of micro-cracks on seepage, the water-cut rises very quickly during the middle-low flooding period. Based on the analysis of coring well data, it is found that pore-type reservoir is the main reservoir in L oilfield, and a few micro-fractures are developed. Therefore, the qualitative analysis of pore-type reservoir is firstly carried out. Quantitative method for interpretation. 1 qualitative methods: combined with production performance data analysis logging data, accurate extraction of logging response characteristics of water-flooded zones, making qualitative templates to divide water-flooded zones; Water flooded zone is identified qualitatively by inversion of original formation resistivity and original formation oil saturation. 2 quantitative method: by calculating triple saturation, a model of water cut and oil displacement efficiency is established, and water modeling level is quantitatively divided. The above methods can be used to identify water flooded zones effectively. Secondly, the water flooding interpretation is carried out by qualitative comparison where micro-fractures are developed, and the imaging data of coring wells are analyzed, and the conventional logging response characteristics of the fracture development section are summarized, which can effectively identify the micro-fracture development zone. Through the cross-well correlation, the water-flooded zone can be identified qualitatively. Combined with all the above methods, it can be widely used in production because it has a strong recognition effect on waterflooded zones and meets the required concordance rate of interpretation.
【学位授予单位】：长江大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P631.81
本文编号：2462497
[Abstract]:The water flooding of oil well in L oilfield is serious, the direction of injection water coning is not uniform, and the sweep efficiency of water drive is low. These problems cause some oil wells to come into production and see water, the production and productivity of oil well are low, and the production of oil well is decreased. In order to restrain the rise of water cut and slow down the decline of production, it is urgent to deeply study the reservoir in the area, find out the relationship between water flooding and reservoir, and establish the qualitative identification method of water flooded zone in L oilfield. The standard of quantitative interpretation and the discriminant model of the relationship between the water-flooded coning mode and the reservoir can be used to judge the water-out status of the newly developed wells quickly. The rule of water flooding in reservoir and the distribution characteristics of remaining oil are found out, and the remaining oil enrichment area is predicted, which provides the basis for profile control and water plugging, improvement of oil recovery, adjustment of reservoir development plan and so on. At present, there are a lot of researches on logging interpretation of sand-mudstone watered-out zone at home and abroad, but there is no complete method system for logging interpretation of carbonate-rock watered-out zone. In addition, compared with logging interpretation of sand-mudstone water-flooded zone, the influence of fractures on water-flooded rule and remaining oil distribution should be considered in log interpretation of carbonate water-flooded zone. Taking L oilfield as the research object, taking logging interpretation of waterflooded zone as the core, combining the characteristics of carbonate rock and considering the influence of fracture in waterflooded process, the systematic research method of water flooded zone interpretation of carbonate rock is established from the logging point of view. In order to effectively predict the residual oil distribution in high water cut stage, a new approach has been explored. Due to the influence of a small amount of micro-cracks on seepage, the water-cut rises very quickly during the middle-low flooding period. Based on the analysis of coring well data, it is found that pore-type reservoir is the main reservoir in L oilfield, and a few micro-fractures are developed. Therefore, the qualitative analysis of pore-type reservoir is firstly carried out. Quantitative method for interpretation. 1 qualitative methods: combined with production performance data analysis logging data, accurate extraction of logging response characteristics of water-flooded zones, making qualitative templates to divide water-flooded zones; Water flooded zone is identified qualitatively by inversion of original formation resistivity and original formation oil saturation. 2 quantitative method: by calculating triple saturation, a model of water cut and oil displacement efficiency is established, and water modeling level is quantitatively divided. The above methods can be used to identify water flooded zones effectively. Secondly, the water flooding interpretation is carried out by qualitative comparison where micro-fractures are developed, and the imaging data of coring wells are analyzed, and the conventional logging response characteristics of the fracture development section are summarized, which can effectively identify the micro-fracture development zone. Through the cross-well correlation, the water-flooded zone can be identified qualitatively. Combined with all the above methods, it can be widely used in production because it has a strong recognition effect on waterflooded zones and meets the required concordance rate of interpretation.
【学位授予单位】：长江大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P631.81
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