密井网条件下地质统计学反演初始模型的构建及其对反演结果的影响——以大庆长垣油田密井间开发区为例

发布时间：2018-04-24 01:24

本文选题：大庆长垣油田 + 初始模型　；参考：《石油地质与工程》2016年06期

【摘要】：在断层附近区域,不加入断层信息的简化初始模型对地震反演结果的预测精度差,不能准确刻画砂体的分布规律。以大庆长垣油田密井网开发区为例,利用井震结合的方法构建了高精度的层位模型和构造模型,建立加入准确构造信息的反演初始模型,并在该初始模型约束下进行地质统计学反演,对比了不同初始模型约束下的地震反演结果及精度。研究结果表明,加入断层信息的初始模型能够有效地提高地质统计学反演的砂岩预测精度,厚度为3 m以上砂岩的预测符合率可提高约7%,厚度为1~3 m砂岩的预测符合率可提高约11%,厚度为1 m以下砂岩的预测符合率可提高约12%。
[Abstract]:In the area near the fault, the prediction accuracy of seismic inversion results is poor without the simplified initial model of fault information, and the distribution law of sand body can not be accurately described. Taking the dense well pattern development zone of Daqing Changyuan oilfield as an example, a high-precision horizon model and a structural model are constructed by combining well and earthquake methods, and an initial inversion model with accurate structural information is established. The geostatistical inversion is carried out under the constraint of the initial model, and the seismic inversion results and accuracy under different initial model constraints are compared. The results show that the initial model with fault information can effectively improve the accuracy of sandstone prediction in geostatistical inversion. The prediction coincidence rate of sandstone with thickness above 3 m can be increased by about 7%, the prediction coincidence rate of sandstone with thickness of 1 m or 3 m can be increased by about 11%, and the prediction coincidence rate of sandstone with thickness below 1 m can be increased by about 12%.
【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;
【基金】：国家自然科学基金“油水分布复杂区单一圈闭控藏模式研究”(41202102)项目资助
【分类号】：TE31;P631.4;P628.2

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