基于源-储单元的页岩油气甜点段评价优选新思路

A new approach to the evaluation and optimal selection of shale oil and gas sweet-spot intervals based on source rock-reservoir units

郭旭升 申宝剑 王鹏威 卢龙飞 李倩文 王冠平 常佳琦 刘伟新 李楚雄 何晋译

Xusheng GUO Baojian SHEN Pengwei WANG Longfei LU Qianwen LI Guanping WANG Jiaqi CHANG Weixin LIU Chuxiong LI Jinyi HE

目前行业内尚未从页岩油气统一性的角度建立甜点段评价参数与标准体系。总有机碳含量（）被认为是必不可少的评价参数，但仅仅利用作为主要参数进行甜点评价而不充分考虑页岩油气储集条件的重要性，会导致评价结果与最优甜点段偏离。在研究中国页岩油气甜点段类型特征的基础上，提出了基于源-储单元的页岩油气甜点段评价新思路，并结合典型地区和典型页岩层系甜点段，提出了该方法的评价流程。源-储分离型页岩油气甜点段的孔隙度与含油/气性正相关，孔隙度是甜点段优选的关键参数；源-储一体型页岩油气甜点段的与含油/气性正相关，无论是还是孔隙度均可作为是甜点段评价的关键参数；源-储共生型页岩油气甜点段的含油/气性受和孔隙度共同控制，只有综合考虑两者才能准确地评价甜点段。页岩油气甜点段评价应聚焦良好的储集层段，而非高有机质丰度层段。今后在页岩油气甜点段评价方法体系中，应对储集条件予以更多考虑，增加孔-缝-纹一体化储集条件评价，并结合地球物理甜点评价技术，提高甜点评价的准确性。

There is a lack of a unified parameter and criterion system for optimal selection of shale oil and gas sweet-spot intervals at present. Although the total organic carbon （） content is widely considered an essential parameter for the selection， the parameter alone may be insufficient to accurately evaluate sweet-spot without adequate consideration of shale reservoir conditions， resulting in deviation of evaluation results from the optimal sweet-spot intervals. Given this， we categorize the shale oil and gas sweet spots in China， and propose a new approach to the evaluation of shale oil and gas sweet-spot intervals based on source rock-reservoir units. Furthermore， an evaluation process of the new approach is proposed combining the analysis of typical regions and typical shale formations in China. The analytical results reveal that the source rock-reservoir units can be categorized into three types： separated， integrated， and paragenetic types. For separated source rock-reservoir units， the shale oil and gas sweet-spot intervals are characterized by a positive correlation between porosity and oil/gas-bearing properties， establishing porosity as the key parameter for selecting optimal sweet-spot intervals. For integrated source rock-reservoir units， the shale oil and gas sweet-spot intervals feature a positive correlation between the content and oil/gas-bearing properties. This indicates that both the content and porosity can serve as key parameters for the evaluation. In contrast， for paragenetic source rock-reservoir units， the oil/gas-bearing properties of shale oil and gas sweet-spot intervals are jointly governed by the content and porosity， both of which should be jointly considered for accurate evaluation. The abovementioned analyses indicate that the evaluation of the shale oil and gas sweet-spot intervals should focus on favorable reservoir intervals rather than those with high organic matter abundance. Therefore， priority should be given to reservoir conditions in the evaluation methodology for optimal selection of shale oil and gas sweet-spot intervals. Specifically， it is necessary to introduce the integrated evaluation of reservoir conditions in terms of pores， fractures， and lamina and develop geophysical evaluation technologies in order to improve the evaluation accuracy.

10.11743/ogg20250101