“断缝体”概念、地质模式及其在裂缝预测中的应用——以四川盆地川西坳陷新场地区须家河组二段致密砂岩气藏为例

doi:10.11743/ogg20210417

Abstract

Abstract:

Fractures are one of the factors crucial for the formation of sweet spots in tight oil & gas reservoirs.Due to the great difference between the geological scale of fractures and the resolution of seismic data, and the vague understanding on development patterns of effective fractures of large scale, the effectiveness of seismic prediction methods of fractures is very limited.Based on the concept of fault-fracture reservoir put forward by some geological researchers in recent years, we summarize the connotation of fault-fracture reservoir, and establish a geological model showing their development in the tight sandstone gas pool of the second member of Xujiahe Formation (hereinafter referred to as Xu 2 Member) in Xinchang area.Furthermore, under the guide of the newly established geological model, we discuss the compositional units and geophysical response features of enclosing rocks, calculate and screen the gradient structure tensor (GST)-based chaotic attributes (chaos) and the maximum likelihood attributes for fault-fracture reservoir prediction, and put forward the technical scheme in predicting fault-fracture reservoirs in the Xu 2 Member tight sandstone pool in Xinchang area.In application of the scheme, artificial fault interpretation and electrical imaging logging are used to determine the threshold values of the GST-based chaotic attributes (chaos) and the maximum likelihood attributes.Besides, the threshold values of seismic attributes are calibrated according to the interpretation results of electrical imaging logging and artificial faults, the maximum likelihood attributes (greater than 0.15) are applied to describe the sliding surface of faults, various ranges of threshold values of chaotic attributes are applied to depict the sliding breaking zone (chaos attribute, 0.18-1.0) and induced fracture zone (chaos attribute, 0.05-0.18), and corresponding prediction results are obtained for major target sequences in the study area as guided by the geological model.The comparison of prediction results and electrical imaging log data shows the prediction is in high consistency with the actual situation, and its geological significance is obvious, indicating the concept of fault-fracture reservoir and its geological model are of application value in the practice of seismic fracture prediction.

Key words: seismic prediction, tight sandstone, fault-fracture reservoir, Xujiahe Formation, Xinchang area, Sichuan Basin

CLC Number:

TE122.2

Zhenfeng Liu, Zhongquan Liu, Yuanling Guo, Yuxin Ji, Wangpeng Li, Tian Lin, Tiansheng Chen, Wujun Jin. Concept and geological model of fault-fracture reservoir and their application in seismic fracture prediction: A case study on the Xu 2 Member tight sandstone gas pool in Xinchang area, Western Sichuan Depression in Sichuan Basin[J]. Oil & Gas Geology, 2021, 42(4): 973-980.

Figures/Tables 6

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Concept and geological model of fault-fracture reservoir and their application in seismic fracture prediction: A case study on the Xu 2 Member tight sandstone gas pool in Xinchang area, Western Sichuan Depression in Sichuan Basin

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