Lithologic Reservoirs ›› 2018, Vol. 30 ›› Issue (1): 133-139.doi: 10.3969/j.issn.1673-8926.2018.01.013

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Prediction for fractured tight sandstone reservoir of Xu 4 member in eastern Yuanba area,northeastern Sichuan Basin

ZHANG Hui, GUAN Da, XIANG Xuemei, CHEN Yong   

  1. Sinopec Geophysical Research Institute, Nanjing 210014, China
  • Received:2017-06-29 Revised:2017-08-20 Online:2018-01-21 Published:2018-01-21

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Abstract: The tight-fracture reservoir is an important reservoir type of Triassic Xujiahe Formation in Sichuan Basin. Since the reservoir has low porosity,low permeability and strong heterogeneity characteristics,the accurate prediction of properties of Xujiahe Formation is the key and difficult point of oil and gas exploration and development in northeastern Sichuan Basin. Facing with these problems,We proposed a theoretical workflow of reservoir prediction. The main idea of our workflow is to define sand in face and define fracture in sand. Firstly,the distribution of favorable sand was predicted by seismic attributes and seismic inversion on the basis of facies-controlled techniques;then using pre-stack and post-stack technology to predict multi-scale fractures,at the same time,based on the method of relation of fault-fracture and difference of reservoir-cap to evaluate effective faultfracture system;Finally,considering the prediction result of sand and fractures point out the favorable exploration target area. The reliability of our method has been testified by comparing with drilling data,and we believe our method can be used to predict others tight sandy reservoir.

Key words: carbonate cements, reservoir quality, Pinghu Formation, Xihu Sag

CLC Number: 

  • P631.4
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