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摘要:
基于阜新盆地地质条件和油气勘探结果, 对辽阜地2井的地质条件和油气资源条件进行了测试试验, 确定了阜新盆地油气资源地质条件、资源条件和赋存条件, 得到了各储层实测临界解析压力, 确定了该区地应力梯度约为0.013 kPa/m, 储层破裂压力为10.6~11.5 MPa. 通过油气产能测试试验得到了辽阜地2井最高日产油16.86 t, 最高日产气2 584 m3, 确定了辽阜地2井区盆地煤层气储量评价为小型中产能气田, 为接下来的地质勘探及开采工作提供了依据.
Abstract:Based on the geological conditions and oil-gas exploration results of Fuxin Basin, the LFD-2 well is tested to determine the geological, resources and occurrence conditions of oil-gas resources in the basin. According to the measured critical analytical pressure of each reservoir, the ground stress gradient of the area is about 0.013 kPa/m, with the reservoir fracture pressure of 10.6-11.5 MPa. The oil-gas productivity test shows that the highest daily oil output is 16.86 t and daily gas output 2 584 m3 in LFD-2 well. The coalbed methane (CBM) reserves in the basin of LFD-2 well is evaluated as a small-scaled gas field with medium productivity, which provides a basis for the following geological exploration and mining work.
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Key words:
- coalbed methane /
- oil-gas resources /
- oil-gas productivity /
- fault tectosphere /
- Fuxin Basin /
- Songliao Basin
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表 1 阜新盆地区域地层表
Table 1. Regional stratigraphy of Fuxin Basin
地层 代号 厚度/m 主要岩性 第四系 Q 0~20 黄土、黏土、砂及砾石 孙家湾组 K2s 300~1000 上、中部：紫红色粗砂岩、砂砾岩，夹薄层砂岩 下部：灰绿、紫红色砾岩，夹白色砂岩、砂砾岩 阜新组 K1f 400~1000 上部：砂岩、砂砾岩、粗砂岩夹薄煤层 中部：砂岩、泥岩、碳质泥岩，夹煤层 下部：砂泥岩互层，夹薄层砾岩，夹薄煤层 沙海组 K1sh4 250~750 泥岩、砂岩，夹砂砾岩透镜体（水下扇） K1sh3 300~600 砂岩、泥岩夹煤层，夹薄层砂砾岩 K1sh2+1 60~193 砂砾岩为主，夹少量泥岩 九佛堂组 K1j 150~1950 上部：灰色泥岩、砂质泥岩 中部：细砂岩、粉砂岩 下部：白云质含泥砂岩、含泥粉砂岩、凝灰岩、角砾岩 义县组 K1y 200~1000 安山岩、玄武岩、流纹岩、角砾熔岩，夹火山质角砾岩、集块岩及凝灰质砂岩、泥岩等 中元古界 Pt2 不详 硅质白云岩和硅质灰岩 新太古界 Ar2 不详 上部：石英片麻岩 下部：花岗片麻岩、角闪岩夹石英岩透镜体 
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表 2 煤层煤质化验结果表
Table 2. Assay results of coal seam quality
煤层 真密度（TRD） 水分 灰分/% 挥发分/% 发热量/（MJ/kg） 硫/% 磷/% 黏结性 黏结指数 镜煤最大反射率 煤类划分 孙本煤层 1.54 5.67 21.26 39.72 23.69 0.87 0.021 2 2 0.58 长焰煤 5.75 6.31 37.98 28.45 0.69 中间煤层 1.50 4.78 20.27 41.01 24.84 0.92 0.019 3 8 0.59 长焰煤 4.73 5.92 39.52 29.34 0.78 太平煤层 1.51 5.29 21.43 39.44 25.78 0.95 0.026 4 28 0.60 长焰煤 4.98 6.55 39.08 29.79 0.80 测试单位：辽宁省东煤测试分析研究院有限责任公司.
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表 3 煤储层等温吸附测试值
Table 3. Isothermal adsorption test values of coal reservoirs
煤层 兰氏体积（VL）/(cm3/g) 兰氏压力（pL）/MPa 孙本层 21.59 9.98 中间层 18.81 6.74 太平层 33.71 9.07
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表 4 主要煤层段储层压力特征值
Table 4. Eigenvalues of reservoir pressure in major coal seams
项目 孙本煤层 中间煤层 太平煤层 压力点深度/m 743.35 821.37 843.32 压力梯度/（MPa/100 m） 0.9071 0.8214 0.9768 储层压力/MPa 6.74 6.747 8.238 闭合压力/MPa — 9.00 11.48 破裂压力/MPa — 10.60 11.50 地应力梯度/（kPa/m） — 0.013 0.0136
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表 5 各煤层含气量
Table 5. Gas content of each coal seam
煤层 理论含气量/（m3/t） 实测含气量/（m3/t） 平均含气量/（m3/t） 孙本层 8.72 5.65~9.52 7.88 中间层 9.41 7.82~9.83 8.49 太平层 10.17 7.00~12.50 9.16
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