鄂尔多斯盆地北部复杂碳酸盐岩横波速度预测研究

发布时间：2018-02-28 09:36

本文关键词： Xu-Payne模型碳酸盐岩复杂孔隙结构复杂岩性横波速度预测　出处：《石油物探》2017年03期 　论文类型：期刊论文

【摘要】：鄂尔多斯盆地北部D气田奥陶系马家沟组马五段发育了岩性和孔隙结构均复杂的碳酸盐岩,储层岩性为白云岩、灰岩中夹杂硬石膏、石英,部分层段黏土含量较高,采用工业界常用的经典碳酸盐岩岩石物理模型Xu-Payne模型不能有效求取该储层的横波速度。针对这一问题,将储层岩石等效为由白云石、方解石、黏土、石英、硬石膏及孔隙流体组成的混合物,将岩石中的孔隙简化等效为刚性孔隙与柔性裂缝,综合利用多孔隙类型微分Kuster-Toks9z(简称DKT)岩石物理模型、Gassmann方程、Wood方程、VRH平均公式构建岩石物理模型,在纵波速度的约束下求出刚性孔隙与柔性裂缝的体积分数,进而求取横波速度。研究区实际测井资料应用上述方法求取的横波速度均方根误差、相关系数要明显优于用多矿物扩展的Xu-Payne模型及原始XuPayne模型的预测结果,验证了方法对于求取复杂岩性、复杂孔隙结构碳酸盐岩储层横波速度的适用性和有效性。
[Abstract]:Carbonate rocks with complex lithology and pore structure have been developed in Majiagou formation of Ordovician Majiagou formation in the northern part of Ordos Basin. The reservoir lithology is dolomite, anhydrite, quartz in limestone, and the clay content in some strata is high. The shear wave velocity of the reservoir can not be calculated effectively by using the classical carbonate rock physical model Xu-Payne model commonly used in industry. In order to solve this problem, the reservoir rocks are equivalent to dolomite, calcite, clay, quartz, etc. A mixture of anhydrite and pore fluid that simplifies pores in rocks as rigid pores and flexible fractures. This paper synthetically uses the multi-pore type differential Kuster-Toks9z (DKT) rock physical model / Wood equation / VRH average formula to construct the rock physical model, and calculates the volume fraction of rigid porosity and flexible fracture under the constraint of longitudinal wave velocity. The correlation coefficient is obviously better than the prediction results of the Xu-Payne model and the original XuPayne model, which are extended by multiple minerals, and the root mean square error of the shear wave velocity obtained by the above method is obviously superior to that of the Xu-Payne model and the original XuPayne model, which are derived from the actual well logging data in the study area. The applicability and validity of the method for calculating the shear wave velocity of carbonate reservoirs with complex lithology and pore structure are verified.
【作者单位】：中国石油化工股份有限公司油田勘探开发事业部;中国石油化工股份有限公司石油勘探开发研究院;西北有色工程有限责任公司;
【基金】：国家科技重大专项“鄂北深层岩溶储层地震预测技术”(2017ZX05005-004-009)及中国石油化工股份有限公司科技部项目“鄂北奥陶系风化壳储层及含气性地震预测技术”(P16066)联合资助~~
【分类号】：P631.4

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