Characteristics of complex gas-water distribution affect the efficient exploration of tight gas. The paper aims at tight sandstone gas-water distribution characteristics of He8 Member in Sulige Gas Province (SGP), describes thickness and TOC of source rocks from Benxi Formation in Carboniferous to the Second Member of Shanxi Formation in Permain, evaluates its hydrocarbon generation potential, discusses its controlling effect on tight sandstone gas-water distribution, and determines the threshold values of R_o and HGI of commercial gas flow wells. Research shows that the coal-measure source rock has the characteristics of extensive and superimposition. The coal seam and dark mudstone is the lithology of source rock, and its R_o is chiefly distributed 1.2% ∼ 2.1% in the stage of high mature thermal evolution, which is mainly type III kerogen. Among them, the thickness of coal seam is mainly ranged from 5 ∼ 15 m with an average of 9.32 m, and its average TOC is 64.08% and the distribution of HGI is (1∼36) ×10⁸ m³/km². No.8 and No.5 coal seams are relatively stable. The extent of thickness of dark mudstone is mainly between 10m and 30m with an average of 21.2m, and its average TOC is 2.11%, HGI is between (0.2∼10)×10⁸m³/km². Gas reservoir of He8 Member is tight sandstone lenticular reservoirs with the large-area quasi-continuous distribution. When the gas testing production is less than 1 × 10⁴m³/d, the controlling effect of R_o and HGI are relatively obvious, and its controlling effect is obviously weakened with the increase of gas production. When R_o is more than 1.6%-1.7%, or HGI is larger than 15 × 10⁸m³/km², the decreasing trend of water/gas ratio is evident, especially in commercial gas flow wells (including high producing gas flow wells). In comparison, the controlling effect of HGI is stronger than R_o. 1.33% and 8 × 10⁸ m³/km² are the threshold values of R_o and HGI for commercial gas flow wells, respectively.

复杂的气水分布特征影响致密气高效勘探。本文针对苏里格天然气省（SGP）河8段致密砂岩气水分布特征，描述了石炭系本溪组至二叠系山西组二段烃源岩的厚度和TOC，评价其生烃潜力，讨论其对致密砂岩气水分布的控制作用，并确定商业气流井的R _o和HGI阈值。研究表明，煤系烃源岩具有广泛性、叠加性的特点。煤层和暗色泥岩是烃源岩的岩性，其R _o主要分布于高成熟热演化阶段的 1.2%～2.1%，主要为 III 型干酪根。其中，煤层厚度主要为5～15 m，平均为9.32 m，平均TOC为64.08%，HGI分布为（1～36）×10 ⁸ m ³ /km ²。8、5号煤层相对稳定。暗色泥岩厚度范围以10m～30m为主，平均21.2m，平均TOC为2.11%，HGI为(0.2～10)×10 ⁸ m ³ /km ²。河8段气藏为致密砂岩透镜状气藏，大面积准连续分布。当试气产量小于1×10 ⁴m ³ /d，R _o和HGI的控制作用比较明显，随着产气量的增加其控制作用明显减弱。当R _o大于1.6%-1.7%，或HGI大于15×10 ⁸ m ³ /km ^{2 时}，水气比下降趋势明显，特别是在商业气井（包括高产气井）井）。相比之下，HGI 的控制作用强于 R _o。1.33%和8×10 ⁸ m ³ /km ²分别是商业气流井的R _o和HGI阈值。