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基于分频尺度约束的缝洞体空间定位方法

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塔里木盆地奥陶系碳酸盐岩缝洞体尺度预测和空间位置确定存在较大困难,影响油气勘探靶点设计、压裂方案实施等.为此,提出一种有效提高缝洞体预测精度的基于分频尺度约束的缝洞体空间定位方法.首先利用叠前分频数据体,通过高斯函数拟合确定缝洞体的调谐频率,得到缝洞体的尺度参数;然后利用这一尺度参数对缝洞体中心阻抗曲线进行阈值扫描,当低阻抗曲线段时间厚度满足缝洞体尺度参数时,便完成阻抗阈值的约束和标定,从而实现缝洞体的尺度预测和空间定位.模型正演验证了该方法的可靠性和准确性.实际资料应用表明,预测结果能更加精细地描述缝洞体尺度特征和空间位置,井轨迹与缝洞体之间的关系更加明确.该方法可以有效指导井位压裂方案的制定,助力油气勘探.
Spatial positioning for fracture-cavity bodies based on frequency-segmented scale constraints
Predicting the scale and determining the position of Ordovician carbonate fracture-cavity bodies in the Tarim Basin is very challenging,which affects the target design and the implementation of fracturing for oil and gas exploration.This paper proposes a method for the spatial positioning of fracture-cavity bodies based on fre-quency-segmented scale constraints,which effectively improves prediction accuracy.Firstly,based on the seis-mic data volumes of pre-stack frequency segmentation,this paper determines the tuning frequency of fracture-cavity bodies by the Gauss function to obtain scale parameters.Then the scale parameters are used to scan the threshold of the impedance curve of central fracture-cavity bodies.When the time thickness of the curve with low impedance matches the scale parameters,the constraints and calibration of the impedance threshold are completed,thereby achieving scale prediction and spatial positioning.The reliability and accuracy of the pro-posed method are verified through forward modeling.Practical applications show that the prediction results can better describe the scale features and spatial positions of fracture-cavity bodies,and provide a clearer relation-ship between well paths and fracture-cavity bodies.This method provides effective support for fracturing plans and oil and gas exploration.

fracture-cavity bodyforward modelingpre-stack frequency segmentationscale predictionquantita-tive inversionoptimal target selection

朱博华、王洋、张胜寒、卢志强、高厚强、袁刚

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中石化石油物探技术研究院有限公司,江苏南京 211103

同济大学海洋与地球科学学院,上海 200092

南京大学地球科学与工程学院,江苏南京 210023

中国石化西北油田分公司勘探开发研究院,新疆乌鲁木齐 830011

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缝洞体 正演模拟 叠前分频 尺度预测 定量反演 靶点优选

中国石化科技攻关项目

P21064-1

2024

石油地球物理勘探
东方地球物理勘探有限责任公司

石油地球物理勘探

CSTPCD北大核心
影响因子:1.766
ISSN:1000-7210
年,卷(期):2024.59(5)