0 引言
1 风险勘探新发现及意义
2 洼陷区大面积岩性油气藏成藏条件
2.1 烃源岩条件
表1 吐哈盆地台北凹陷水西沟群烃源岩地球化学指标简表Table 1 Geochemical indexes of source rocks of Shuixigou Group in Taipei Sag, Turpan Hami Basin |
凹陷 | 层系 | 岩性 | 面积/km2 | 厚度/m | TOC/% | (S 1+S 2)/(mg/g) | I H/(mg/g) | R O/% |
---|---|---|---|---|---|---|---|---|
胜北 | J2 x | 泥岩 | 4 311 | 100~400 | (0.51~5.16)/1.98 | (0.48~15.26)/3.34 | (43~318)/180 | (0.5~1.0)/0.7 |
煤 | 1 083 | 40~100 | (41.96~76.13)/57.5 | (43.7~93.74)/74.75 | (93.5~47.6)/119 | |||
J1 s | 泥岩 | 1 337 | 50~180 | (0.4~11.97)/1.52 | (0.15~18.21)/2.8 | (31~329)/180 | (0.64~0.83)/0.73 | |
J1 b | 泥岩 | 4 205 | 100~150 | (0.5~5.72)/1.59 | (0.48~32.65)/3.74 | (20.34~447)/124 | (0.7~0.97)/0.82 | |
煤 | 330 | 20~40 | 59.9 | 221.63 | 264.31 | |||
丘东 | J2 x | 泥岩 | 2 612 | 100~600 | (0.5~7.81)/1.9 | (0.52~57.53)/7.12 | (11.63~392.86)/144 | (0.51~1.21)/0.75 |
煤 | 1 745 | 40~140 | (14.4~83)/42 | (15.78~222.52)/66 | (89~334)/151 | |||
J1 s | 泥岩 | 1 179 | 100~180 | (0.27~11.76)/1.26 | (0.11~33.29)/5.12 | (95~392)/175 | (0.5~1.1)/0.82 | |
J1 b | 泥岩 | 1 567 | 100~250 | (0.52~4.55)/1.26 | (0.5~26.65)/4.4 | (28.57~950)/112 | (0.67~1.3)/1.1 | |
煤 | 416 | 20~60 | 67.9 | 170.81 | 226 | |||
小草湖 | J2 x | 泥岩 | 2 465 | 100~400 | (0.56~5.65)/1.44 | (0.5~43.24)/4.55 | (24~291)/127 | (0.5~1.15)/0.78 |
煤 | 1 553 | 40~120 | 50.7 | 70.14 | 25 | |||
J1 s | 泥岩 | 1 184 | 50~150 | (0.17~2.26)/0.73 | (0.03~2.12)/0.47 | (2.2~74.4)/26.4 | (0.6~0.97)/0.73 | |
J1 b | 泥岩 | 1 038 | 100~200 | (0.51~3.51)/1.2 | (1.35~10.93)/3.15 | (41~93)/68 | (0.6~0.97)/0.73 |
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2.2 储层条件
图6 吉7井、沁探1井和葡探1井三工河组储层微观照片(a) 吉7井,中—粗砂岩,溶蚀孔、微裂缝,孔隙度为5.1%,渗透率为0.348×10-3 µm2,J1 s,5 333.08 m,铸体薄片;(b) 吉7井,含砾细砂岩,溶蚀孔,孔隙度为4.1%,渗透率为0.031×10-3 µm2,J1 s,5 334.30 m,铸体薄片;(c) 沁探1井,细砂岩,溶孔,孔隙度为4.0%,渗透率为0.015×10-3 µm2,J1 s,5 479.58 m,铸体薄片;(d) 沁探1井,细粉砂岩,构造缝,孔隙度为3.3%,渗透率为0.008×10-3 µm2,J1 s,5 476.34 m,铸体薄片;(e) 葡探1井,粗砂岩,溶蚀孔,孔隙度为7.1%,渗透率为0.322×10-3 µm2,J1 s,5 334.93 m,铸体薄片;(f) 葡探1井,含砾粗砂岩,溶蚀孔、微裂缝,孔隙度为6.4%,渗透率为1.490×10-3 µm2,J1 s,5 335.28 m,铸体薄片 Fig.6 Wells Ji 7, Qintan 1 and Putan 1 reservoir micrograph of J1 s |