STUDY ON PALEO-TECTONIC AND PRESENT TECTONIC STRESS IN CHANG 7 TIGHT RESERVOIR OF MALING OILFIELD, ORDOS BASIN
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摘要: 构造应力是油气运移与富集的控制因素之一,古今构造应力状态的研究对油气勘探与开发具有重要意义。利用流体包裹体测温、古地磁裂缝定向、声发射法和微地震监测、岩石压缩试验和水力压裂法分别对鄂尔多斯盆地马岭油田长7致密储层古今构造应力进行研究。结果表明:长7致密储层裂缝发育关键期为燕山运动Ⅳ幕,其水平最大主应力方向为84°,有效应力大小为44 MPa;现今水平最大主应力方向为76°,而现今水平最小主应力有效应力大小为15 MPa。Abstract: Tectonic stress is one of the controlling factors of hydrocarbon migration and accumulation. The study of stress state on paleo-tectonic and present tectonic is of great significance to the exploration and development of oil and gas. Temperature measurement of fluid inclusion, paleomagnetic fracture orientation, acoustic emission method, microseismic monitoring, rock compression experiment and hydraulic fracturing method are applied respectively to the study of paleo-tectonic and present tectonic stress in the Chang 7 tight reservoir of Maling oilfield in Ordos Basin. The results show that the crucial period of fracture formation in the Chang 7 tight reservoir is the Ⅳ stage of the Yanshan movement, with the horizontal maximum principal stress direction of 84° and effective stress 44 MPa, while the current horizontal maximum principal stress direction is 76° and the current effective stress of minimum principal stress is 15 MPa.
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图 6 水力压裂测地应力曲线示意图
(据参考文献[40])
Figure 6. Sketch map of in-situ stress curves tested by hydraulic fracturing
表 1 马岭油田长7致密储层裂缝古地磁定向结果
Table 1. Results of paleomagnetic orientation of fractures in the Chang 7 tight reservoir in Maling oilfield
序号 井号 深度/m 岩性 裂缝走向/° 裂缝性质 1 白483 2041.5 灰色细砂岩 13.1 张扭缝 2 西232 2018 深灰色粉砂岩 60.6 压扭缝 3 镇233 2203.6 灰色粉砂岩 60.7 压扭缝 4 里170 1995.5 灰色粉砂岩 63.8 压扭缝 5 西271 2058.3 灰黑色粉砂岩 64.9 压扭缝 6 西270 2079.5 灰黑色粉砂岩 65.1 压扭缝 7 里155 1981.5 灰色细砂岩 66.9 压扭缝 8 板15 2073.1 灰色粉砂岩 67.6 压扭缝 9 西259 1928 灰色细砂岩 73.2 压扭缝 10 庄140 1873.4 深灰色粉砂岩 79.9 压扭缝 11 白270 2018 深灰色粉砂岩 81 张扭缝 12 阳测5 2055.6 灰褐色细砂岩 86.1 张扭缝 13 白117 1887.4 灰色细砂岩 87.6 张扭缝 14 城94 1827 深灰色细砂岩 88.5 张扭缝 15 西240 2028.2 浅灰色细砂岩 96.7 压扭缝 16 镇219 2257.3 深灰色粉砂岩 99.9 压扭缝 17 里92 2191.4 灰色粉砂岩 105.6 压扭缝 18 里89 2317.7 灰绿色细砂岩 107 压扭缝 19 西208 1910.5 深灰色细砂岩 108.8 张扭缝 20 镇140 2147.9 灰色细砂岩 114.6 压扭缝 21 里17 1828.4 灰色细砂岩 121.4 压扭缝 22 城120 1988.4 深灰色细砂岩 123 压扭缝 表 2 岭油田西平233井区长7致密储层开发水平
Table 2. Micro seismic monitoring data of horizontal wells for oil production in the Chang 7 tight reservoir of Xiping 233 wellblock, Maling oilfield
井号 层位 段数 段号 缝高/m 带长/m 带宽/m 破裂方位/° 西平233-52 长7 5 5 30 666 47 78 6 72 666 30 78 7 77 706 38 78 8 72 708 100 78 9 55 632 80 78 西平235-52 长7 7 1 10 29 27 75 2 106 322 103 78 3 133 395 99 77 4 128 396 86 75 5 131 213 101 73 6 35 77 49 72 西平235-54 长7 7 1 122 64.2 68 76.6 2 127 188 139 75.4 3 128 217 126 76.9 4 124 333 93 75.5 5 122 67.1 73 77.2 6 45 110 40 76.7 现今平均最大主应力方向: 76.4 表 3 马岭油田长7致密储层岩石压缩法现今最小主应力计算结果
Table 3. Calculation results of present minimum principal stress using rock compression experiments of samples from the Chang 7 tight reservoir in Maling oilfield
编号 井号 深度/m 岩性 最小主应力/MPa 1 白117 1881.0 灰黄色粉-细砂岩 15.89 2 白117 1881.0 灰黄色粉-细砂岩 16.42 3 白117 1881.0 灰黄色粉-细砂岩 15.71 4 白117 1881.0 灰黄色粉-细砂岩 15.82 5 西245 2004.2 灰黄色粉-细砂岩 15.59 6 西245 2004.2 灰黄色粉-细砂岩 15.49 7 西245 2004.2 灰黄色粉-细砂岩 15.47 8 西245 2004.2 灰黄色粉-细砂岩 15.61 9 西271 2025.0 灰白色细砂岩 13.98 10 西271 2025.0 灰白色细砂岩 13.99 11 西271 2025.0 灰白色细砂岩 13.89 12 西271 2025.0 灰白色细砂岩 13.99 13 里155 1982.4 灰白色细砂岩 14.66 14 里155 1982.4 灰白色细砂岩 14.60 15 里155 1982.4 灰白色细砂岩 14.61 16 里155 1982.4 灰白色细砂岩 14.52 平均值: 15.02 表 4 马岭油田西233井区长7致密储层开发水平井套管停压数据表
Table 4. Pump pausing pressures in casings of horizontal wells for oil production in the Chang 7 tight reservoir of Xi 233 wellblock, Maling oilfield
序号 井号 完钻井深/m 水平段长/m 套管停压/MPa 1 西平231-48 3750 1531.4 15.2~19.1 2 西平233-56 3240 843.5 14.6~22.2 3 西平235-62 2714 739.95 14.9~16.9 4 西平235-56 3084 854 13.3~16.0 5 西平233-58 3021 840 16.7~21.9 6 西平235-52 3178 938.1 12.5~15.7 7 西平235-54 3147 840.44 13.4~15.5 8 西平235-60 2760 740.73 15.8~16.8 9 西平230-47 3140 722 14.6~22.2 10 西平230-45 3206 716 12.7~13.4 11 西平230-43 3175 840 13.9~15.5 12 西平230-41 3123 840 13.9~14.9 13 西平233-52 3078 842.4 12.8~14.3 14 西平229-38 3557 1209.36 14.2~15.3 15 西平229-46 3557 1209.36 15.1~16.4 16 西平231-46 4010 1400.9 11.1~13.1 17 西平233-54 3132 842.27 13.9~14.9 18 西平236-44 3645 1401.95 14~19.3 现今平均最小有效主应力: 15.2 -
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