海陆过渡相致密砂岩储层Biot系数自适应预测方法研究

发布时间：2018-06-12 17:31

本文选题：致密砂岩 + 自适应方法　；参考：《石油物探》2016年06期

【摘要】：沁水盆地石炭—二叠系海陆过渡相致密砂岩气测异常极为普遍,具有致密气勘探、开发潜力,但目前该地层致密砂岩缺少Biot系数的相关研究。Biot系数(α)的准确预测对地震反演、压裂设计、出砂趋势预测、储层应力敏感性、井眼轨迹优化及井壁稳定性分析等方面均具有重要参考价值。为了弥补该不足,以海陆过渡相致密砂岩储层为研究对象,结合Gassman-Biot-Geertsma方程,提出基于自适应方法的Biot系数预测方法。研究结果表明,利用自适应方法能有效提取目的层致密砂岩的基质矿物体积模量(Ko)和干岩石体积模量(Kd)。Ko与Kd均与纵波速度(vP)具有较好的正相关性。该致密砂岩的孔隙度φ平均值为4.11%,α平均值为0.179。α较低的原因与致密砂岩所经历的强压实及胶结作用相关。将提出的Biot系数预测新方法分别与孔隙度方法、声学参数方法及考虑孔隙空间变形3种方法进行了对比,结果表明,利用孔隙度和声学参数方法计算所获得的α与本文结果具有较好的对应关系,验证了本文方法的有效性。
[Abstract]:In the Carboniferous Permian, the Carboniferous and Permian facies of the Qinshui Basin are extremely common in the tight sandstone gas measurement of the sea land transitional facies, with the exploration of tight gas and the potential for development. But at present, the dense sandstone lacks the correlation of Biot coefficient. The accurate prediction of the.Biot coefficient (alpha) is the accurate prediction of seismic inversion, fracturing design, sand production trend, reservoir stress sensitivity and well trajectory optimization. In order to make up for this shortage, in order to make up the shortage, taking the tight sandstone reservoir of sea land transition phase as the research object and combining the Gassman-Biot-Geertsma equation, the Biot coefficient prediction method based on the adaptive method is proposed. The results show that the self adaptation method can effectively extract the dense sandstone of the target layer. The bulk modulus (Ko) and the bulk modulus (Kd) of the dry rock (.Ko and Kd) have a good positive correlation with the P-wave velocity (vP). The mean value of the porosity of the tight sandstone is 4.11%, the mean value of the alpha value is lower than that of 0.179. a, which is related to the strong compaction and cementation of the tight sandstone. The proposed new method for predicting the Biot coefficient is proposed, respectively. Compared with the porosity method, the acoustic parameter method and the 3 methods considering the pore space deformation, the results show that the results obtained by the method of porosity and acoustic parameters have good correspondence with the results of this paper, and the validity of this method is verified.
【作者单位】：中国地质大学(北京)能源学院;成都理工大学能源学院;
【基金】：国家自然科学基金(41372139,41072098) 国家科技重大专项(2011ZX05018-001-002,2011ZX05009-002-205,2016ZX05046-003-001)联合资助~~
【分类号】：P618.13

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