Identification And Class Ification Method Of Large Pore Characteristics Of Channel Sand

Based on this research into middle south 1st area in DaQ ing oilfield, the article analysed four aspects of channel sandbodies in three kinds of subphases, which were flood plain, distributary plain and delta inner front respectively, and the four aspects were the distribution of permeability, the distribution of phase controlled space; the range of flood area and flood thickness changing with the time. According to the following four essentials, which are the distribution of permeability, the effective sandstone thickness, high waterflooding thickness and the calculation of two parameters PDKD and PDKD T HIN(concluded via the well log curve), we defined the large pole identification standard and four types of large pore, named relatively as I II III IV. By looking into the development characteristics of large pole channel single sandbody inner side, we identified the typical sedimentary unite sand pole. Research showed that in the flooding plain scenario, I, II type large pole distribute as short ribbon paralleled along the first and second channel sandbodies, while III and IV type distribute as pieces ad short ribbons paralleled along the channel. In the distributary plane scenario, I, II type randomly distribute blocky in the first and second channel sandbodies, along them distributed III and IV types in block and flake. I n the Delta Inner Front scenario, I, II types distributed paralleled along the first and second channel sandbodies blocky, among them randomly paralleled III and IV large pore type flaky.