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徐深气田A 区块岩石力学参数及地应力分析
Geomechanical parameters and in-situ stress in A block, Xushen gasfield, Songliao Basin
吴云龙
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作者单位:中国石油大庆油田有限责任公司勘探开发研究院
中文关键字:松辽盆地 徐深气田 岩石力学参数 地应力方向 地应力大小 水平井优化设计
英文关键字:Songliao Basin; Xushen gasfield; Geomechanical parameter; In-situ stress direction; In-situ stress; Horizontal-well optimal design.
中文摘要:    松辽盆地徐深气田A 区块下白垩统营城组火山岩储层非均质性强,单井自然产能低,储层的岩石力学性质、地应力特征与储层中裂缝的分布情况有着密切关系,是油田后期开发井网部署、水平井优化设计、压裂方案制定的重要依据。通过岩石力学参数测试分析了工区营城组火山岩的岩石力学参数特征,找出了动、静态岩石力学参数之间相关关系;通过波速各向异性结合测井解释确定了工区水平最大主应力方向,并利用声发射效应计算了水平最大、最小主应力值及应力梯度。结果表明:①营城组火山岩的岩石力学参数明显高于沉积岩,且火山岩中不同岩性之间岩石力学参数存在差异性;②动静态岩石力学参数相关关系表现为静态弹性模量和动态弹性模量相关性一般,静态泊松比和动态泊松比相关性较差;③火山岩水平最大主应力方向在NE83.4 ~ 129.6°,多集中在NE106.1°附近;④火山岩主应力随深度增加而增大,水平最大主应力介于83.8 ~ 96.1 MPa,水平最小主应力介于63.9 ~ 79.9 MPa。结论认为,该区水平井轨迹延伸方向为SN 向且施工压裂大于87 MPa 时,更易形成纵横交错的裂缝网络。
英文摘要:    Most volcanic rock reservoirs of Lower Gretaceous Yingcheng Formation in A block, Xushen gasfield, Songliao Basin, are featured by strong heterogeneity and low single-well natural productivity. Their geomechanical properties and in-situ stress characteristics are closely related to fracture distribution in these reservoirs. And these properties and characteristics are the important basis for well pattern deployment, horizontal-well optimization design, and fracturing scheme formulation in the later development stage. By means of parameter test, some geomechanical parameter characteristics of Yingcheng volcanic rocks were analyzed and the correlation between dynamic and static parameters was made clear. Then, based on wave velocity anisotropy, combined with logging interpretation, the direction of maximum horizontal principal stress was determined. Finally, both maximum and minimum horizontal principal stress and stress gradient were calculated by virtue of acoustic emission effect. Results show that, (1) the geomechanical parameters of these volcanic rocks are obviously greater than those of sedimentary rocks, and there is difference in the parameters between different lithology of volcanic rocks; (2) the correlation between static and dynamic elastic modulus is fair and that between static and dynamic Poisson's ratios is poor; (3) the direction of the maximum horizontal principal stress of volcanic rocks is 83.4-129.6 °NE, mostly near 106.1 °NE; and (4) the principal stress increases with depth increase, the maximum and minimum ones are respectively 83.8-96.1 MPa and 63.9-79.9 MPa in the range. In conclusion, a crisscrossed fracture network can be created easily in this block when the trajectory extension direction of horizontal well is SN, and the fracturing pressure is higher than 87 MPa.
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国内统一连续出版物号:CN51-1159/TE |国内发行代码: |国际标准出版物号:ISSN1673-3177 |国际发行代码:
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