Application of 3D Geological Modeling in Horizontal Well Development of Tight Sandstone Oil Reservoirs: A Case Study of Block S in Ordos Basin

doi:10.7657/XJPG20200517

Abstract

Abstract:

In order to effectively improve the accuracy and success rate of drilling horizontal wells in tight sandstone oil reservoir in the southern Ordos basin, 3D geological modeling technology involving the geological structure, lithofacies, reservoir properties and configuration and GR curve of the Chang 8 member was based to design horizontal well trajectories and make adjustment while drilling in the S block. The results show that reservoir configuration model and natural gamma model can effectively characterize the distribution law of the sandbody in the target zones, and quantitatively support the design of horizontal well trajectories. The horizontal trajectories could be adjusted in time with the help of LWD GR data, so the horizontal sections could be always kept through the reservoirs with good physical properties. Three horizontal wells have been completed successfully at a drill-in rate of 98.5% in reservoirs and 90.3% in pay zones, and the post-fracturing production is high after putting into production. 3D geological modeling can effectively support the design and adjustment of horizontal well trajectories. The experience is of referential significance for drilling horizontal wells and development of the tight oil reservoirs in the Ordos basin.

Key words: Ordos basin, Yanchang formation, tight sandstone reservoir, 3D geological modeling, reservoir configuration model, horizontal well, trajectory design, adjusting while drilling

CLC Number:

TE19
TE348

LIANG Weiwei, DANG Hailong, CUI Pengxing, WANG Xiaofeng, HOU Fenchi, ZHANG Tianlong. Application of 3D Geological Modeling in Horizontal Well Development of Tight Sandstone Oil Reservoirs: A Case Study of Block S in Ordos Basin[J]. Xinjiang Petroleum Geology, 2020, 41(5): 616-621.

Figures/Tables 8

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Table 1

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