Abstract
The determination of the sweet spot of tight sandstone reservoir is the primary problem in the exploration and development of tight sandstone reservoir. Practice has proved that the prediction of reservoir spatial pore characteristics, thickness distribution and oil and gas potential (i.e. geological sweet spot) of tight sandstone reservoir can not meet the demand of exploration and development of tight sandstone reservoir. In view of the requirements of tight sandstone fracturing engineering, it is also necessary to analyze the engineering field of the reservoir. In this paper, based on seismic data preprocessing and petrophysical analysis, thin reservoir quantitative characterization and AVO fluid prediction are used to evaluate the tight reservoir. At the same time, combining with the fracture analysis method of FMI imaging logging, pre stack fracture description and brittleness prediction, the “engineering sweet spot” prediction is carried out. Finally, the multi-attribute RGB digital fusion visualization research method is used to comprehensively evaluate the tight reservoir. The practice shows that the research method has guiding significance for the exploration and development of tight reservoir.
Highlights
The research on tight sandstone reservoirs started from the beginning of the 1980s. Walls (1982) was the first one who proposed the related concept of oil and gas reservoir in tight sandstone. Law (1993) defined the concept of right sandstone reservoir more clearly and pointed out the difference between tight sandstone reservoir and tight sandstone gas reservoir in the aspect of spatial occurrence position, guiding the prediction studies of “desserts” in tight sandstone reservoir in a certain sense
Tong X G et al (2012) compared the generality and difference between Chinese and American tight gas reservoirs, and further expounded the particularity of tight gas researches in China; In recent years, geophysicists from various countries have done a lot of work of sweet spot determination in tight sandstone reservoirs, and the main geophysical technologies used include seismic discontinuous analysis technology, prestack and post-stack inversion, quantitative reservoir characterization and fracture prediction technology, Amplitude Variation with Offset (AVO) fluid prediction technology, etc
Zhu X M et al (2018) pointed out that the sweet spot formation mechanism in tight reservoirs and sweet spot determination were still the research hotspots and difficulties in the field of geoscience, and the scholars reflected upon the effect of natural fractures in tight sandstone reservoir on hydrofracturing in sweet zone; With further deepening of the exploration and development researches on tight sandstone reservoirs, the engineering development factors of tight sandstone reservoirs have been investigated while “geological sweet spots” in tight reservoirs are predicted
Summary
The research on tight sandstone reservoirs started from the beginning of the 1980s. Walls (1982) was the first one who proposed the related concept of oil and gas reservoir in tight sandstone. Law (1993) defined the concept of right sandstone reservoir more clearly and pointed out the difference between tight sandstone reservoir and tight sandstone gas reservoir in the aspect of spatial occurrence position, guiding the prediction studies of “desserts” in tight sandstone reservoir in a certain sense. Tong X G et al (2012) compared the generality and difference between Chinese and American tight gas reservoirs, and further expounded the particularity of tight gas researches in China; In recent years, geophysicists from various countries have done a lot of work of sweet spot determination in tight sandstone reservoirs, and the main geophysical technologies used include seismic discontinuous analysis technology, prestack and post-stack inversion, quantitative reservoir characterization and fracture prediction technology, Amplitude Variation with Offset (AVO) fluid prediction technology, etc. The “double sweet spots prediction”, which integrates reservoir physical attribute and gas-bearing attribute-dominated “geological sweet spot” and reservoir fracture-dominated “engineering sweet spot”, has become a new research hotspot regarding tight sandstone reservoirs. The domestic (China) researches on tight sandstone reservoirs via this technology have been scarcely reported
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