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| 海上古近系前积体储层预测技术 -以渤海A油田为例 |
| Prediction technology of offshore Paleogene progradation reservoir -- Taking Bohai A oilfield as an example |
| 投稿时间：2022-07-01 修订日期：2022-07-01 |
| DOI： |
| 中文关键词: 前积体 多次波 广义S变换 沉积格架 分频反演 |
| 英文关键词: progradation multiples generalized S-transform sedimentary framework frequency divisiong inversion |
| 基金项目:“十三五”国家科技重大专项“渤海油田加密调整及提高采收率油藏工程技术示范”项目（编号：2016ZX05058-001）资助 |
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| 中文摘要: |
| 渤海湾A油田沉积相为河控型辫状河三角洲沉积，发育前积体储层。单期前积体具有厚度厚、充满度高、分布局限等特征，属于典型的“小而肥”，是油田挖潜的重点方向。为精细刻画前积体的平面范围，利用基于最小二乘法近道振幅拟合技术压制多次波解决近道剩余多次波的问题；利用基于广义S变换的拓频技术同时拓展地震的低频信号和高频信号，获得真正的宽频地震信号。基于目标处理后的地震资料，在地质模式的约束下，精细解释单期前积体，建立精细纵向沉积格架和平面展布形态。最后采用分频非线性反演，利用单期前积体地层格架进行约束，得到高分辨率的反演密度数据体,实现对单期前积体的平面展布和厚度的准确预测和描述。开发井实钻情况证实，前积体储层预测厚度与实际钻遇厚度一致，为该油田开发井井位优化与滚动评价提供技术支撑，同时也为其他地质油藏条件及埋深、地震资料品质类似的中深层复杂油田储层预测提供借鉴。 |
| 英文摘要: |
| A oilfield in Bohai Bay belongs to river controlled braided river delta deposit, and the reservoir is progradation reservoir. The single stage progradars have the characteristics of thick thickness, high filling degree and limited distribution. The typical "small and fat" is the key direction of potential exploitation in oil fields. In order to describe the plane range of the precursor, the residual multiple wave suppression technology based on amplitude fitting and signal matching reconstruction is used to solve the problem of residual multiple waves in the near-channel. The extension technology based on generalized S transform is used to expand the low-frequency and high-frequency signals of earthquakes at the same time to obtain the real wide-frequency seismic signals. Based on the seismic data processed by the target, the single stage progradars are explained carefully under the constraints of geological model, and the fine vertical sedimentary framework and plane distribution form are established. Finally, the high resolution inversion density data body is obtained by using the frequency division nonlinear inversion and the formation frame of the single stage precursor is used to constrain the inversion density data body, and the accurate prediction and description of the plane distribution and thickness of the single stage precursor are realized. The prediction accuracy of reservoir is up to 90% by the new drilling development well, which effectively guides the implementation and rolling evaluation of the development well in the oilfield, and provides technical reference for other geological reservoir conditions, seismic data quality and similar buried depth. |
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