0 引言
1 地质背景
2 模拟实验样品与条件
2.1 模拟实验样品
表1 川中地区须家河组致密砂岩模拟实验样品储层物性参数Table 1 Reservoir parameters of Xujiahe Formation tight sandstone in central Sichuan Basin |
地区 | 样品编号 | 层位 | 岩性 | 井深/m | 孔隙度/% | 渗透率/(10-3 μm2) |
---|---|---|---|---|---|---|
安岳 | YUE2 | T3 x 4 | 灰白色细砂岩 | 2 057 | 5.5 | 0.062 |
YUE8 | T3 x 2 | 灰白色中砂岩 | 2 252 | 11.5 | 0.437 | |
YUE12-183 | T3 x 2 | 灰白色中砂岩 | 2 473 | 7.8 | 0.280 | |
YUE12-186 | T3 x 2 | 灰白色中砂岩 | 2 485 | 8.5 | 0.163 | |
YUE12-471 | T3 x 2 | 灰白色细砂岩 | 2 561 | 7.4 | 0.122 | |
YUE12-391 | T3 x 2 | 灰白色细砂岩 | 2 537 | 5.1 | 0.117 | |
YUE12-469 | T3 x 2 | 灰白色细砂岩 | 2 561 | 4.8 | 0.141 | |
蓬莱 | PL7-56 | T3 x 2 | 灰白色中砂岩 | 3 004 | 12.6 | 0.568 |
PL7-146 | T3 x 2 | 浅灰色细砂岩 | 3 138 | 9.1 | 0.116 | |
PL7-320 | T3 x 2 | 灰白色细砂岩 | 3219 | 7.1 | 0.013 | |
金华 | JH2-61 | T3 x 2 | 灰白色细砂岩 | 3 294 | 4.0 | 0.018 |
JH2-103 | T3 x 2 | 灰白色细砂岩 | 3 303 | 6.4 | 0.120 | |
JH2-115 | T3 x 2 | 灰白色细砂岩 | 3 306 | 6.7 | 0.136 | |
合川 | HC5-254 | T3 x 2 | 灰白色细砂岩 | 2 256 | 5.6 | 0.029 |
HC7 | T3 x 4 | 灰白色细砂岩 | 2 186 | 6.4 | 0.070 |
2.2 实验条件
3 结果与讨论
3.1 天然气特征与近源聚集
图2 川中地区须家河组天然气甲烷碳同位素与湿度关系Fig.2 Relationship between the methane carbon isotopes and wetness of Xujiahe Formation gas in central Sichuan Basin |
表2 川中地区须家河组天然气甲烷、湿度系数及碳同位素数据Table 2 Methane, wetness and carbon isotope of Xujiahe Formation gas in central Sichuan Basin |
气田/气藏 | 层位 | CH4/% | (C2 +/C1 +)/% | δ13C1/‰ |
---|---|---|---|---|
广安 | T3 x 6 | (88.02~94.28)/89.87(26)* | (5.15~11.52)/8.83(26) | (-42.5~-38.1)/-39.7(26) |
T3 x 4 | (88.98~94.31)/92.42(7) | (4.00~9.96)/6.35(7) | (-40.2~-37.0)/-38.1(7) | |
八角场 | T3 x 6 | (87.40~89.50)/89.80(3) | (9.21~9.47)/9.30(3) | (-41.0~-40.3)/-40.4(3) |
T3 x 4 | (87.29~92.31)/90.58(14) | (6.10~9.75)/7.89(14) | (-39.3~-37.3)/-38.6(4) | |
T3 x 2 | (91.32~94.44)/92.94(4) | (4.65~7.57)/6.13(4) | (-38.4~-37.0)/-37.7(2) | |
磨溪 | T3 x 6 | 88.22(1) | 10.03(1) | -41.2(1) |
T3 x 4 | (85.38~91.47)/87.62(14) | (6.62~13.04)/10.51(14) | ||
T3 x 2 | (86.23~92.26)/88.95(13) | (6.53~11.65)/9.35(13) | ||
充西 | T3 x 6 | 89.18(1) | 9.58(1) | -40.4(1) |
T3 x 4 | (87.31~90.18)/88.82(6) | (7.97~11.01)/9.70(6) | (-43.8~-39.7)/-41.4(6) | |
遂南 | T3 x 6 | (86.43~88.89)/86.66(2) | (10.52~12.08)/11.30(2) | -41.3(1) |
T3 x 4 | (84.15~88.32)/86.15(4) | (10.51~14.02)/12.32(4) | -42.5(1) | |
T3 x 2 | (84.04~89.54)/86.64(4) | (9.59~13.48)/11.60(4) | (-41.4~-40.9)/-41.2(2) | |
营山 | T3 x 6 | (88.74~90.55)/89.78(6) | (8.23~9.98)/8.91(6) | (-41.4~-39.3)/-40.6(6) |
T3 x 4 | (87.88~92.52)/90.20(2) | (6.55~9.18)/7.87(2) | (-40.4~-39.1)/-39.8(2) | |
T3 x 2 | (89.81~95.22)/92.27(16) | (4.20~8.86)/6.51(16) | (-40.8~-37.5)/-39.1(16) | |
白庙场 | T3 x 6 | 92.17(1) | 6.95(1) | -37.6(1) |
T3 x 4 | (90.62~91.62)/91.12(2) | (6.61~6.83)/6.72(2) | ||
龙岗 | T3 x 6 | (87.65~95.11)/92.12(6) | (4.06~10.64)/6.72(6) | (-42.2~-38.1)/-39.7(4) |
T3 x 4 | (93.07~97.24)/95.16(2) | (2.36~5.88)/4.12(2) | (-37.1~-35.4)/-36.2(2) | |
T3 x 2 | (90.69~95.28)/92.85(4) | (3.49~8.06)/5.78(4) | (-39.9~-34.6)/-36.5(4) | |
合川 | T3 x 2 | (85.77~94.38)/89.96(27) | (5.02~13.02)/8.53(27) | (-42.8~-38.3)/-40.5(17) |
安岳 | T3 x 2 | (80.25~89.35)/85.34(28) | (8.70~14.42)/12.48(28) | (-43.8~-40.7)/-42.1(13) |
3.2 气藏含气饱和度与储层孔隙半径
3.2.1 气藏含气饱和度
3.2.2 储层孔隙半径
3.2.3 不同孔隙中的含气饱和度
图5 致密砂岩模拟样品含气饱和度与孔隙度、渗透率关系Fig. 5 Relationships between gas saturation and porosity, permeability respectively of tight sandstone samples |