摘要
海陆过渡相页岩气作为非常规油气的重要接替资源,明确其总有机碳(total organic carbon,简称TOC)含量的空间分布对页岩气“甜点”的预测具有重要意义。由于海陆过渡相页岩w(TOC)与岩石弹性参数无有效表征关系,导致海相页岩气评价中常用的基于敏感弹性参数预测w(TOC)的方法难以适用。针对这一难题,在测井参数拟合法实现w(TOC)测井评价的基础上,引入基于相控的波形指示模拟地震预测方法实现了海陆过渡相页岩地层w(TOC)的空间预测。结果表明,海陆过渡相页岩具有单层厚度薄、有机质含量高、纵向分布不规律的特点;基于储层特征参数的井震高频模拟有效预测了海陆过渡相页岩w(TOC),反演结果纵、横向分辨率较高,与测井参数建模解释的w(TOC)曲线吻合度高,符合率达84.4%,能够反映页岩储层w(TOC)空间变化规律。本研究有效解决了海陆过渡相页岩气“甜点”关键评价参数(w(TOC))无法利用岩石弹性参数定量预测的难题,为海陆过渡相页岩气勘探开发提供了技术支撑。
[Objective]Marine-continental transitional shale gas is a vital alternative resource for unconventional oil and gas exploration.Accurately characterizing the spatial distribution of total organic carbon content(TOC)is vital for predicting shale gas“sweet spots”.[Methods]Due to the absence of an effective relationship between TOC content and rock elastic parameters in marine-continental transitional shale,conventional TOC content prediction methods based on elastic parameters,commonly used in marine shale gas evaluations,are difficult to apply.To overcome this limitation,we propose a waveform indication simulation seismic prediction method driven by facies control,which is performed after TOC content evaluation through a logging parameter fitting technique.This approach enables the spatial prediction of TOC content within transitional shale strata.[Results]The marinecontinental transitional shale exhibits features such as thin monolayer thickness,high organic matter content,and irregular longitudinal distribution.High-frequency waveform simulation based on reservoir characteristic parameters effectively predicts TOC content in the transitional shale.The inversion results demonstrate relatively high vertical and horizontal resolutions and show a strong correlation with the TOC content curves obtained from logging parameter modeling.The coincidence rate reaches 84.4%,effectively reflecting the spatial variation of TOC content within the shale reservoir.[Conclusion]This method effectively addresses the challenge that the key evaluation parameter(TOC content)for identifying shale gas“sweet spots”in transitional facies cannot be quantitatively predicted solely from rock elastic parameters.It provides technical support for the exploration and development of transitional shale gas.
作者
吴勇
王旭旭
周路
李树新
李永洲
吴丰
WU Yong;WANG Xuxu;ZHOU Lu;LI Shuxin;LI Yongzhou;WU Feng(School of Geoscience and Technology,Southwest Petroleum University,Chengdu 610500,China;Exploration and Development Research Institute,PetroChina Changqing Oilfield Company,Xi’an 710018,China;PetroChina Coalbed Methane Co.,Ltd.,Beijing 100028,China)
出处
《地质科技通报》
北大核心
2025年第4期354-367,共14页
Bulletin of Geological Science and Technology
基金
中国石油-西南石油大学创新联合体科技合作项目(2020CX030103)。
