致密砂岩储层岩石物理横波速度预测方法 ——以鄂尔多斯盆地延长组为例

doi:10.7623/syxb202209007

石油学报 ›› 2022, Vol. 43 ›› Issue (9): 1284-1294.DOI: 10.7623/syxb202209007

致密砂岩储层岩石物理横波速度预测方法 ——以鄂尔多斯盆地延长组为例

刘致水¹, 王康宁², 包乾宗¹, 李之旭³

1. 长安大学地质工程与测绘学院陕西西安 710054;
2. 中国石油化工股份有限公司石油勘探开发研究院北京 102206;
3. 中国石油辽河油田公司开发事业部辽宁盘锦 124000

收稿日期:2021-04-28 修回日期:2022-04-06 发布日期:2022-10-08
通讯作者: 刘致水,男,1988年9月生,2016年获中国石油大学(北京)地质资源与地质工程专业博士学位,现为长安大学副教授,主要从事地震岩石物理建模、油气储层预测与烃类检测方面的教学与科研工作。
作者简介:刘致水,男,1988年9月生,2016年获中国石油大学(北京)地质资源与地质工程专业博士学位,现为长安大学副教授,主要从事地震岩石物理建模、油气储层预测与烃类检测方面的教学与科研工作。Email:zhishuiliu@yeah.net
基金资助:
国家自然科学基金项目(No.42104120)、陕西省自然科学基金项目(No.2021JQ-242)和陆相页岩油气成藏及高效开发教育部重点实验室基金项目(NEPUME-kfjj-014)资助。

Prediction method of rock physics S-wave velocity in tight sandstone reservoir: a case study of Yanchang Formation in Ordos Basin

Liu Zhishui¹, Wang Kangning², Bao Qianzong¹, Li Zhixu³

1. School of Geological Engineering and Geomatics, Chang'an University, Shaanxi Xi'an 710054, China;
2. Sinopec Petroleum Exploration and Production Research Institute, Beijing 100083, China;
3. Development Division, PetroChina Liaohe Oilfield Company, Liaoning Panjin 124000, China

Received:2021-04-28 Revised:2022-04-06 Published:2022-10-08

摘要/Abstract

摘要： 鄂尔多斯盆地三叠系延长组致密砂岩储层储集空间以三角形孔隙、四边形孔隙等多边形孔隙为主,含少量裂缝。传统的致密砂岩岩石物理横波速度预测方法均基于椭圆形孔隙的理论假设,对多边形孔隙的描述效果不理想。通过将延长组致密砂岩储层中的孔隙等效为三角形、四边形孔隙及其与裂缝的组合,构建了考虑多边形孔隙与裂缝共生情况的致密砂岩储层的多边形孔隙—裂缝共生模型,用以预测致密砂岩储层的横波速度。该方法将规则多边形孔隙的岩石物理模型与微分等效介质岩石物理模型结合,引入凸边三角形孔隙和凹边四边形孔隙在总孔隙度中的体积比w₁、w₂,来描述岩石中复杂孔隙类型对纵波、横波速度的影响。在纵波速度的约束下求算w₁、w₂,进而预测致密砂岩储层的横波速度。通过数值正演模拟、对比岩心测试数据、测井解释横波速度等多种方法的验证,证实了多边形孔隙—裂缝共生模型在致密砂岩储层横波速度预测的有效性。

关键词: 岩石物理模型, 三角形孔隙, 四边形孔隙, 裂缝, 致密砂岩, 横波速度, 预测方法

Abstract: The reservoir space of tight sandstone reservoirs in Triassic Yanchang Formation of Ordos Basin is dominated by polygonal pores such as triangular and square ones,with a few cracks.Traditional prediction methods of rock physics S-wave velocity in tight sandstone reservoirs are based on the theoretical assumption of elliptical pores,which cannot achieve an ideal effect of describing polygonal pores.Assuming that the pores in the tight sandstone reservoirs of Yanchang Formation are equivalent to triangular and square pores and the combination of these pores and fractures,this paper establishes a prediction method of S-wave velocity in tight sandstone reservoir that considers the coexistence of polygonal pores and fractures.The method combines the rock physics model of regular polygonal pores with that of differential equivalent medium and introduces the volume ratios of convex triangle pores and concave square pores (w₁ and w₂) to the total porosity,so as to describe the impact of complex types of pores in rocks on P-wave and S-wave velocity.These two parameters (i.e.,w₁ and w₂) are calculated under the constraint of P-wave velocity,based on which S-wave velocity in tight sandstone reservoir can be predicted.Through numerical forward simulation,comparison of core test data,and well logging interpretation of S-wave velocity,the validity of the calculation method for S-wave velocity in tight sandstone reservoir proposed herein has been verified.

Key words: rock physics model, triangular pores, square pores, fractures, tight sandstone, S-wave velocity, prediction method

中图分类号:

P631.4

刘致水, 王康宁, 包乾宗, 李之旭. 致密砂岩储层岩石物理横波速度预测方法 ——以鄂尔多斯盆地延长组为例[J]. 石油学报, 2022, 43(9): 1284-1294.

Liu Zhishui, Wang Kangning, Bao Qianzong, Li Zhixu. Prediction method of rock physics S-wave velocity in tight sandstone reservoir: a case study of Yanchang Formation in Ordos Basin[J]. Acta Petrolei Sinica, 2022, 43(9): 1284-1294.

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致密砂岩储层岩石物理横波速度预测方法 ——以鄂尔多斯盆地延长组为例

Prediction method of rock physics S-wave velocity in tight sandstone reservoir: a case study of Yanchang Formation in Ordos Basin

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