Shale fracture prediction using integrated seismic methods

IF 3.7 2区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Marine and Petroleum Geology Pub Date : 2025-04-29 DOI:10.1016/j.marpetgeo.2025.107439

Zhiyuan Sun , Shouyu Xu , Cunfei Ma , Tao Li , Jiachang Zhang , Fancheng Zeng

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引用次数: 0

Abstract

A casing deformation incident occurred in the Longmaxi Formation during shale gas production at Platform H1 in the southern Sichuan Z215 well block. Based on the monitoring and analysis of microseismic signals, preliminary analysis suggests the hydration of NW-trending fractures generated by hydraulic fracturing. The deeper shale layers of the Longmaxi Formation (3500 m) are complicated to interpret seismically because they are poorly resolvable with weak fracture responses, such that traditional seismic attributes cannot effectively recognize microfaults and microfractures. This has hampered additional production in the Z215 well block. To enhance seismic resolution and accurately describe fracture distribution in this area, we applied an integrated approach combining seismic forward modeling, spectral decomposition, 3D U-Net convolutional neural networks, ant colony algorithm, seismic inversion, and microseismic signal monitoring for comprehensive fracture prediction. Fracture prediction from this method demonstrates high consistency with microseismic data and shows a fault-fracture network that is governed by NE-trending major faults and limited NW-trending fractures. Casing deformation at Platform H1 was associated with composite deformation comprising NE-trending major faults, EW-trending minor faults, and NW-trending fractures. This study shows that the integrated method proposed in this paper can predict fractures in the Z215 well block reliably; this may be a reference for shale fracture prediction in other regions.

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综合地震方法预测页岩裂缝

川南Z215井区H1平台页岩气开采过程中，发生了龙马溪组套管变形事件。通过对微震信号的监测和分析，初步分析了水力压裂nw向裂缝的水化作用。龙马溪组深层（3500 m）页岩层可分辨性差，裂缝响应弱，传统地震属性无法有效识别微断裂和微裂缝，地震解释难度大。这阻碍了Z215井区的额外生产。为提高地震分辨率，准确描述裂缝分布，采用地震正演模拟、光谱分解、三维U-Net卷积神经网络、蚁群算法、地震反演和微震信号监测相结合的方法进行裂缝综合预测。该方法的裂缝预测与微震数据具有较高的一致性，显示出北东向主要断裂和少量北西向裂缝控制的断裂断裂网络。H1平台的套管变形与ne向大断裂、ew向小断裂和nw向裂缝的复合变形有关。研究表明，本文提出的综合预测方法能够可靠地预测Z215井区裂缝；这对其他地区的页岩裂缝预测具有一定的参考价值。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Marine and Petroleum Geology 地学-地球科学综合

CiteScore

8.80

自引率

14.30%

发文量

475

审稿时长

63 days

期刊介绍： Marine and Petroleum Geology is the pre-eminent international forum for the exchange of multidisciplinary concepts, interpretations and techniques for all concerned with marine and petroleum geology in industry, government and academia. Rapid bimonthly publication allows early communications of papers or short communications to the geoscience community. Marine and Petroleum Geology is essential reading for geologists, geophysicists and explorationists in industry, government and academia working in the following areas: marine geology; basin analysis and evaluation; organic geochemistry; reserve/resource estimation; seismic stratigraphy; thermal models of basic evolution; sedimentary geology; continental margins; geophysical interpretation; structural geology/tectonics; formation evaluation techniques; well logging.