Petrophysical facies characteristics and reservoir classification evaluation of the glutenite reservoir of the E3d3 of Paleogene in the Block C, western Shijiutuo Uplift
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摘要:
利用岩芯、铸体薄片、扫描电镜、常规物性及动态监测等资料，以渤海C区块东三段砂砾岩储层为靶区，开展沉积相、成岩相及孔隙结构相综合作用下的岩石物理相研究，并基于岩石物理相进行储层分类评价。研究区东三段以扇三角洲前缘亚相沉积为主，发育近岸水道、碎屑流、远岸水道和分流间湾4种沉积微相。成岩相划分为泥/砂质杂基充填相、压实致密相、不稳定组分溶蚀相和碳酸盐胶结相。孔隙结构相划分为大孔粗喉、中孔中喉、大孔细—中喉和小孔细喉。选取储集层品质指数（RQI）值表征不同沉积相、成岩相及孔隙结构相对储层的影响，通过计算储集层岩石物理相的定量参数值，表征不同相的综合作用下对储层物性和产能的影响，并将研究区东三段岩石物理相划分为3类，对应Ⅰ—Ⅲ类储层。利用东三段生产井投产初期所获得的产出剖面测试资料，验证了通过岩石物理相静态参数划分储集层类别的合理性。研究成果可为下一步注采优化调整及潜力调整井位优选提供一定的地质依据。
Abstract:Using core, cast thin sections, scanning electron microscopy, conventional physical properties and dynamic monitoring data, the petrophysical facies of the glutenite reservoir in the E3d3 of the Block C of the Bohai Bay is studied under the comprehensive action of sedimentary facies, diagenetic facies and pore structure phase. The results show that fan-delta front subfacies are the main sedimentary microfacies of the E3d3 in the study area, with four types of sedimentary microfacies: near-shore channel, detrital flow, far-shore channel and distributary bay. Diagenetic facies can be divided into mud/sandy mixed base filling phase, compacted dense phase, unstable component dissolution phase and carbonate cementation phase. The pore structure phase can be divided into large pore type, middle pore type, large pore type and small pore type. Reservoir Quality Index (RQI) value was selected to characterize the influence of different sedimentary facies, diagenetic facies and pore structure on the reservoir. By calculating the quantitative characterization parameter values of the reservoir petrophysical facies, the influence of different facies on the reservoir physical property and productivity was characterized. The petrophysical facies of the E3d3 in the study area were divided into 3 categories, corresponding to class Ⅰ—Ⅲ reservoirs. Based on the output profile test data obtained in the early production period production well of the E3d3 in the study area, the rationality of classifying reservoirs by the static parameters of petrophysical facies is verified. The research results can provide some geological basis for the next step of injection and production optimization and potential adjustment of well location selection in this area.
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Key words:
- Shijiutuo Uplift /
- E3d3 /
- petrophysical facies /
- reservoir classification evaluation
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表 1 研究区东三段储层高压压汞测试孔喉结构参数表
Table 1. Pore throat structure parameters of high pressure mercury injection test on the E3d3 in the study area
类型 Φ/% K/10−3 μm2 孔喉大小参数 连通性参数 n/个 Pd/MPa γp/μm Smax/% We/% 大孔粗喉 平均值 21.2 579.4 0.03 6.54 93.6 22.3 16 最大值 25.1 1 102.4 0.05 12.38 96.8 33.7 最小值 17.0 79.4 0.02 2.24 89.5 16.6 中孔中喉 平均值 17.3 127.2 0.05 3.28 90.1 26.3 5 最大值 20.1 195.4 0.08 4.49 92.6 27.2 最小值 14.4 43.5 0.03 1.39 87.0 25.2 大孔细—中喉 平均值 16.7 34.3 0.13 1.13 85.9 35.6 5 最大值 21.5 50.5 0.31 1.50 90.7 50.0 最小值 11.9 7.5 0.08 0.37 83.1 27.2 小孔细喉 平均值 13.3 12.4 0.28 0.71 84.5 37.1 7 最大值 19.1 32.8 0.46 1.50 89.7 44.5 最小值 8.6 1.5 0.08 0.32 81.9 31.1 注：Φ为孔隙度，K为渗透率，Pd为排驱压力，γp为平均孔喉半径，Smax为最大进汞饱和度，We为退汞效率，n为样品数。 
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表 2 研究区东三段岩石物理相主控因素及物性/产能系数
Table 2. Main controlling factors of petrophysical facies and the physical property/productivity coefficient of the E3d3 in the study area
主控因素及类别 孔隙度/% 渗透率/10−3 μm2 RQI/μm 物性/产能系数 沉积相 远岸水道 15.1～24.1/19.4 121.8～1 364.5/501.5 5.08 4.24 近岸水道 11.0～19.4/15.2 10.9～242.9/90.3 2.44 2.03 碎屑流 9.0～20.7/14.5 6.0～42.4/24.0 1.29 1.07 分流间湾 7.3～13.9/10.1 6.6～26.3/14.4 1.19 1.00 成岩相 不稳定组分溶蚀相 14.0～24.1/18.9 121.8～1 364.5/463.1 4.95 3.96 碳酸盐胶结相 10.6～17.2/15.3 30～80.6/53.2 1.86 1.55 泥/砂质杂基充填相 11.0～19.4/15.3 10.9～49.4/35.0 1.51 1.26 压实致密相 7.3～20.7/12.3 6.0～42.4/19.2 1.25 1.00 孔隙结构相 大孔粗喉 17.0～25.1/21.2 79.4～1 105.4/579.4 5.23 5.39 中孔中喉 14.4～20.1/17.3 43.5～195.4/127.2 2.71 2.79 大孔细—中喉 11.9～21.5/16.7 7.5～50.5/34.3 1.43 1.47 小孔细喉 8.6～19.1/13.3 1.5～32.8/12.4 0.97 1.00 注：孔隙度、渗透率数据为最小值～最大值/平均值。
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表 3 研究区东三段岩石物理相及储层分类评价
Table 3. Petrophysical facies and reservoir classification evaluation on the E3d3 in the study area
岩石物理
相类别物性指标 产能指标 沉积相 成岩相 孔隙结构相 孔隙度
/%渗透率
/10−3 μm2储层类别 PF1 7.083～7.343/7.265 3.286～4.846/4.382 远岸水道 不稳定组分溶蚀相 大孔粗喉为主、中孔中喉次之 19.4 485.4 Ⅰ 优质 PF2 2.878～5.757/4.161 1.181～3.065/2.143 远岸水道 碳酸盐胶结相 中孔中喉 15.3 46.4 Ⅱ 中等 近岸水道 不稳定组分溶蚀相 大孔细—中喉 14.4 43.5 近岸水道 泥/砂质杂基充填相 大孔细—中喉 15.3 35.0 PF3 2～2.089/2.030 1～1.165/1.058 分流间湾 压实致密相 小孔细喉 10.1 9.4 Ⅲ 差 碎屑流 压实致密相 小孔细喉 16.0 6.0 注：物性、产能指标数据为最小值～最大值/平均值。
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表 4 研究区东三段不同类型储层产能对比表
Table 4. Productivity comparison among different types of reservoirs in the E3d3 in the study area
数据组 产层段
有效厚度/m不同储集层占比/% 初期
日产油量/(m3/d)比采油指数
/（m3/（d·Mp·m））产层段
类别Ⅰ类 Ⅱ类 Ⅲ类 S-1 39.8 80.9 10.1 9.0 199.1 3.3 A 42.1 0.0 60.1 39.9 70.9 1.3 B 38.0 0.0 37.6 62.4 15.6 0.1 C S-2 31.6 75.3 12.8 11.9 110 2.8 A 32.9 5.8 81.1 13.1 71.7 1.4 B 30.8 0.0 15.6 84.4 5.2 0.1 C S-3 20.5 61.0 25.2 13.8 65.1 2.7 A 22.5 3.8 59.2 37.0 32.9 1.2 B 19.6 0.0 21.0 79.0 5.1 0.2 C S-4 10.0 58.0 30.0 12.0 34.1 2.5 A 10.7 7.5 74.1 18.4 17.8 1.3 B 11.7 0.0 38.5 61.5 2 0.1 C 注：表中数据为平均值。
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