Classification and Formative Effects of Sandstone Reservoirs with Low Recovery Efficiency
|School||Chinese Geology University (Beijing)|
|Course||Mineral prospecting and exploration|
|Keywords||Daqing Changyuan Reservoir heterogeneity Difficult to use the reservoir Image analysis Pore ??structure|
Thesis Daqing the Changyuan Saertu oilfield North West End for the object, Saar, Figure Putaohua the Gaotaizi three sets of reservoir sandstone reservoir water / polymer flooding reservoir characteristics difficult to use in the development process, analysis of the formation of difficult to draw on a reservoir of factors discussed difficult classification method utilized the reservoir criteria for the classification as well as the single well profile on its distribution characteristics are analyzed and utilized conditions. Made the following main results: 1, the basic characteristics of each reservoir sandstone reservoir analysis, based on research the sandstone reservoir layers in the region between the plane and the layer of non-homogeneous characteristics, and reservoir water oil displacement efficiency relationship. 2, the use of digital microscopy image analysis system the 92 the core plugs sample 33 microscopic two-dimensional pore structure parameters were measured, the results show that the pore structure parameters and core plugs samples measured permeability and water flooding efficiency parameters between a high correlation. 3, water 10 kinds of image analysis of pore structure parameters and water flooding efficiency is closely related to the simulation of oil displacement efficiency. An important basis from which to determine the the pore morphology index as a reservoir types by. 4, from macro to micro comprehensive analysis of the factors affecting the reservoir formation difficult to use. Analysis of the causes of sand body types, sedimentary cycle characteristics, layer series of development wells network type and injection wells pitch and sand microscopic heterogeneity and so on factors to determine the main factors that control water / polymer flooding development effect. 5, the use of pore morphology index in the core samples divided sandstone reservoir types. Analysis of the various types of sandstone reservoir rock types and pore structure parameters characteristics, looking for all kinds of difficult and easy to draw on the law of distribution of reservoir pore structure. Thus to apply the method to a single well core section, respectively, according to the balance sheet thickness and the effective thickness divided all kinds of difficult and easy use of the reservoir type. To reservoir classification criteria for the classification of writing into computer operating interpreter will be difficult to use by Delphi5.0 language to achieve human-computer interaction. 6, the use of the criteria for the classification and the classification of computer operating interpreter, analysis of the region's 49 three infill wells difficult to use the reservoir distribution characteristics. Effective thickness, accounted for 43.4% of the entire reservoir layers difficult to draw on the reservoir, which Ⅰ, Ⅱ class accounted for 44.6%, Ⅲ class IV 55.4%. Separate sheet thickness, difficult to draw on a reservoir accounted for 49.8% of the number of layers of the reservoir, which Ⅰ, Ⅱ class accounted for 71.1%, 28.9% Ⅲ, Ⅳ. Studies suggest that the reservoir is difficult to use the effective thickness spend relatively large potential. From three aspects difficult to spend reservoir utilization conditions: (1) appropriate adjustments to the type of well network; (2) change the physical and chemical properties of the injected fluid, the polymer injection is now the preferred method; (3) thin and poor difficult to draw on the reservoir layer and table limit fracturing completion should be used as much as possible, to improve the flow properties of the reservoir near the wellhead.