發(fā)布時(shí)間：2018-04-13 18:29

  本文選題：致密砂巖 + 高壓壓汞��； 參考：《巖性油氣藏》2017年05期

【摘要】：為了評(píng)價(jià)致密砂巖儲(chǔ)層類型,為致密油氣的勘探與開發(fā)提供理論依據(jù),利用分形理論和高壓壓汞方法,結(jié)合儲(chǔ)層物性資料,通過(guò)對(duì)11個(gè)致密砂巖樣品的壓汞實(shí)驗(yàn),研究了冀中坳陷致密砂巖儲(chǔ)層微觀孔隙結(jié)構(gòu)。結(jié)果表明:根據(jù)進(jìn)汞曲線拐點(diǎn),將致密砂巖儲(chǔ)層孔隙系統(tǒng)按直徑大小劃分為裂隙(10μm)、大孔(1~10 μm)、中孔(0.1~1.0 μm)和微孔(0.1 μm)。依據(jù)分形理論,分別求取各尺度孔隙分形維數(shù),驗(yàn)證了孔隙系統(tǒng)劃分的正確性。根據(jù)不同尺度孔隙的分布頻率,結(jié)合樣品孔滲、排驅(qū)壓力和退汞效率等參數(shù)將致密砂巖儲(chǔ)層分為3類:Ⅰ類儲(chǔ)層微孔分布頻率高,但幾乎無(wú)連通孔隙,具有較低的滲透率;Ⅱ類儲(chǔ)層連通孔隙發(fā)育,但微孔較少;Ⅲ類儲(chǔ)層不僅有大量微孔,同時(shí)有豐富的連通孔隙,滲透率也較高。通過(guò)分析得出,微孔分布頻率越高,退汞效率越高,孔隙結(jié)構(gòu)越簡(jiǎn)單,均質(zhì)性越好;裂隙和大孔均決定了儲(chǔ)層的滲流能力。因此,Ⅲ類致密砂巖儲(chǔ)層為最優(yōu)質(zhì)的儲(chǔ)層,可作為致密油氣勘探與開采的首選目標(biāo)。
[Abstract]:In order to evaluate the type of tight sandstone reservoir and provide theoretical basis for exploration and development of tight oil and gas, using fractal theory and high pressure mercury injection method, combined with reservoir physical property data, the mercury injection experiments of 11 tight sandstone samples were carried out.The micropore structure of tight sandstone reservoir in Jizhong Depression is studied.The results show that according to the inflexion point of mercury injection curve, the pore system of tight sandstone reservoir is divided according to its diameter into 10 渭 m fissures, 10 渭 m of macropore, 0.1 渭 m of mesopore, 0.1 渭 m of micropore and 0.1 渭 m of micropore.According to the fractal theory, the fractal dimension of pores at each scale is obtained, which verifies the correctness of pore system partition.According to the distribution frequency of pores at different scales, combined with sample porosity and permeability, the tight sandstone reservoirs can be classified into three categories: type I reservoirs with high distribution frequency of micropores, but almost no connected pores, with low permeability;The type 鈪，

本文編號(hào)：1745690