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- Title
陆相低压页岩油体积开发理论技术及实践 ——以鄂尔多斯盆地长7 段页岩油为例.
- Authors
焦方正
- Abstract
Shale oil in Chang 7 member(Abbr. as Chang 7)mainly developed as gravity flow deposits in semideep to deep lacustrine environment. Compared to the marine shale rocks in North America, continental shale oil in Chang 7 is thin in single sand body, poor in lateral continuity, strong in reservoir heterogeneity, tight in its reservoir and low in formation pressure index. These characteristics made it more difficult to develop shale oil in Chang 7 and thus shale oil has driven much attention as it might be another significant superseding area for national energy safety in China. After years of research and field practice, “volume development”theory was pro⁃ posed based on the unique characteristics of the shale oil in China. Guided by the theory, complex artificial fracture systems are established after multi-section fracturing in horizontal wells, and thus forms a composite flow pattern including nonlinear seepage and imbibition replacement processes between multi-sized artificial fractures and the matrix. Application of the theory has dramatically optimized the seepage environment and created“artificial oil and gas reservoir”underground, and thus established a key technology characterized with long horizontal well, short well spacing, large well cluster, stereoscopic fracture and subdivision volumetric fracturing. This technology has made commercial development of shale oil in Chang 7 possible and a demonstration area with one-million tons of annual shale oil production has been established. It also provides theoretical basis and technical support for an overall development of the continental shale oil in China.
- Subjects
CHINA; HORIZONTAL wells; GAS reservoirs; PETROLEUM reservoirs; SHALE oils; PETROLEUM industry; SHALE; GAS condensate reservoirs
- Publication
Natural Gas Geoscience, 2021, Vol 32, Issue 6, p836
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2021.02.012