基于孔喉结构建立致密砂岩储层评价方案——以松南中央坳陷泉四段为例
发布时间：2019-04-12 17:23
【摘要】：致密砂岩储层评价方案是识别储层"甜点"的基础,也是致密油勘探的重点和难点,但目前国内对此尚无统一认识。为此,以松南中央坳陷区泉四段致密砂岩为例,综合常规压汞、恒速压汞、高压压汞等多种资料对致密储层微观孔喉结构进行了精细表征,并以此为基础建立了致密砂岩储层评价方案。结果表明:研究区致密砂岩孔喉小、物性差,储集空间以次生溶孔为主;储层渗透性主要由占小部分体积的最大孔喉半径所控制,喉道半径越大、大喉道所占比例越高,致密储层的渗透率(K)就越高、品质就越好。在此基础上,由孔喉结构的差异性出发,将松南中央坳陷区泉四段致密砂岩储层分类4类,其中,石油能够充注至Ⅰ—Ⅲ类致密储层,且Ⅰ类致密储层(K为(0.1~1.0)×10~(-3)μm~2)品质最高,可视为储层"甜点"。
[Abstract]:The evaluation scheme of tight sandstone reservoir is the basis of identifying reservoir "dessert" and the key and difficult point of tight oil exploration, but there is no unified understanding about it in our country at present. Therefore, taking the tight sandstone of the fourth member of Quan formation in the central depression of Songnan as an example, the micro-pore throat structure of the tight reservoir has been characterized in detail by integrating the data of conventional mercury pressure, constant velocity mercury pressure and high pressure mercury pressure and so on. On the basis of this, the evaluation scheme of tight sandstone reservoir is established. The results show that the pore throat of the tight sandstone in the study area is small, the physical properties are poor, and the reservoir space is dominated by secondary dissolved pores. The permeability of the reservoir is mainly controlled by the largest pore throat radius, which accounts for a small part of the volume. The larger the throat radius, the higher the proportion of the large throat, the higher the permeability (K) and the better the quality of the tight reservoir. On the basis of this, based on the difference of pore-throat structure, the tight sandstone reservoirs in Quan-4 member of Songnan Central Depression are classified into four types, in which oil can be injected into 鈪，
本文编号：2457219
[Abstract]:The evaluation scheme of tight sandstone reservoir is the basis of identifying reservoir "dessert" and the key and difficult point of tight oil exploration, but there is no unified understanding about it in our country at present. Therefore, taking the tight sandstone of the fourth member of Quan formation in the central depression of Songnan as an example, the micro-pore throat structure of the tight reservoir has been characterized in detail by integrating the data of conventional mercury pressure, constant velocity mercury pressure and high pressure mercury pressure and so on. On the basis of this, the evaluation scheme of tight sandstone reservoir is established. The results show that the pore throat of the tight sandstone in the study area is small, the physical properties are poor, and the reservoir space is dominated by secondary dissolved pores. The permeability of the reservoir is mainly controlled by the largest pore throat radius, which accounts for a small part of the volume. The larger the throat radius, the higher the proportion of the large throat, the higher the permeability (K) and the better the quality of the tight reservoir. On the basis of this, based on the difference of pore-throat structure, the tight sandstone reservoirs in Quan-4 member of Songnan Central Depression are classified into four types, in which oil can be injected into 鈪，
本文编号：2457219
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