The Standard Division of Tight Oil Reservoirs in Chang 6-8 Members of Changqing Oilfield based on CQ Index
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摘要:
鄂尔多斯盆地三叠系长6—长8段致密油储层具有低孔、低渗、低压和低产等特征，为了优选单井剖面的地质甜点、工程甜点，针对长6—长8段致密油储层的地质特性，提出了一种划分致密油储层标准的实用方法。首先计算或提取储层的最小水平主应力、破裂压力、脆性指数、孔隙度、渗透率及含水饱和度等参数，建立储层完井品质综合评价指标CQ；然后基于CQ和单井产能的关系图版，将储层划分为好、中、差3个等级，并根据CQ值优选射孔压裂层段。利用该方法对长庆油田陇东地区L375井进行了储层划分，划分结果与试油结果对比表明，基于CQ指标优选出的射孔压裂位置与实际高中低产井段完全相符。研究表明，该方法满足优选致密油射孔压裂位置和寻找地质甜点、工程甜点的要求，可以用于区块储层的划分。
Abstract:The tight oil reservoirs in the Chang 6-8 Member of the Triassic Yanchang Formation in the Ordos Basin are characterized by low porosity, low permeability, low pressure and low production. In order to optimize the geological engineering sweet spots on the single-well section, a practical method for standard division of tight oil reservoirs has been proposed in accordance with the geological characteristics of Chang 6-8 tight oil reservoir. The first step involved calculating and extracting the minimum horizontal principal stress, fracture pressure, brittleness index, porosity, permeability and water saturation of reservoir etc. This allows them to establish the comprehensive evaluation index of the reservoir completion quality (CQ), and then, to classify the reservoirs “good, medium and bad” based on the relationship chart of CQ and single well productivity. And then to optimize the perforating and fracturing intervals in terms of the CQ value. Using this method, reservoir division was performed in Well L375 of the Changqing Longdong Area, and the comparison of division result and the oil test result showed that the perforating/fracturing interval optimized by the CQ index was completely consistent with the actual intervals of high, medium and low production-yields. Study results also indicated that this method could meet the requirements for optimizing the perforating/fracturing intervals of tight oil and and for identifying engineering geological sweet spots, and can be used for a classification standard for block reservoirs.
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图 1 倾斜层理面或层界面发育地层与大地坐标系、层状坐标系的关系
Figure 1. The relationship between the strata developed ininclined bedding plane or layer interface and earth coordinate system and layered coordinate system
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图 2 倾斜层状地层的地应力分量转换关系
Figure 2. Conversion relationship of in-situ stress componentsof inclined layered strata
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图 3 完井品质综合评价指标和单井产能的交会图
Figure 3. Crossplot of comprehensive appraisal index of completion quality and single well daily production
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图 4 L375井长7—长8段2 350～2 510 m测井优选的射孔层段及位置
Figure 4. Optimization result of perforating interval and location at 2 350-2 510 m of Chang 7-8 members in Well L375
表 1 L375井延长组致密油射孔压裂优选层段
Table 1 Optimized intervals for perforating/fracturing in Yanchang tight oil formation of Well L375
小层编号 储层井段/m 解释结论 CQ 优选射孔井段/m S 排序 65 2 475.00～2 483.50 油层 186.49 2 478.00～2 482.00 192.417 1 60 2 366.50～2 373.50 油层 105.15 2 369.38～2 373.38 149.429 2 69 2 500.38～2 507.00 油层 94.00 2 500.62～2 504.62 122.245 3 55 2 333.00～2 335.88 油层 83.14 2 333.00～2 335.88 113.843 4 58 2 355.75～2 360.00 油层 61.41 2 356.12～2 360.00 77.703 5 67 2 488.75～2 491.88 油层 50.57 2 488.75～2 491.88 68.576 6 66 2 484.50～2 485.50 油层 26.92 2 484.50～2 485.50 34.627 7 52 2 293.38～2 295.75 油层 18.00 2 293.38～2 295.75 21.524 8 68 2 495.38～2 497.00 干层 0.09 2 495.38～2 497.00 0.096 9 51 2 285.00～2 287.88 干层 0.08 2 285.00～2 287.88 0.090 10 
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表 2 L375井实际射孔位置与通过CQ指标所优选射孔位置对比
Table 2 Comparison of actual perforation position and optimized perforation position by CQ index in Well L375
层位 CQ 优选射孔位置/m 实际射孔位置/m 产油量/（t·d–1） 储层划分结果 长7 61.41 2 356.13～2 360.00 2 358.24 32.47 优质储层 105.15 2 369.38～2 373.38 2 370.28 长8 186.49 2 478.00～2 482.00 2 478.00～2 481.00 21.59 优质储层 50.57 2 488.75～2 491.88 2 489.00～2 491.00
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