Abstract
Abstract The exploration of unconventional oil and gas, especially the exploration process of tight oil, is closely related to the evolution of tight reservoirs and the accumulation process. In order to investigate the densification and accumulation process of the Fuyu tight oil reservoir in the Sanzhao depression, Songliao Basin, through the new understanding of reservoir petrological characteristics, diagenesis and diagenetic sequence are combined with a large number of inclusions: temperature measurement, spectral energy measurement, and single-well burial history analysis, and then contrastive analysis with current reservoir conditions. The results prove that diagenesis is dominated by compaction and cementation, and the restoration of paleoporosity shows that its porosity reduction rate reached 67% and the densification process started in the early Nenjiang Formation and was finalized at the end of the Nenjiang Formation. The accumulation of the Fuyu oil layer generally has the characteristics of two stages and multiple episodes, and the main accumulation period is the end of the Mingshui Formation. The end of the Nenjiang Formation, where the main body of the reservoir is densified, is just a prelude to the massive expulsion of hydrocarbons in the Songliao Basin, which makes the Fuyu oil layer have the characteristics of first compacting and then accumulating. Through the above analysis, it can be seen that the accumulation of oil and gas in the Fuyu oil layer, Sanzhao depression, is more dependent on the fault-dominated transport system. In addition, it is believed that tight oil accumulation should have the characteristics of short-distance oil enrichment around the fault, and the development area of fracture deserts near the fault sand body should be the key area for further exploration.
Highlights
The Fuyu oil layer in the Sanzhao depression is located in the northern Songliao Basin, which is close to the source rock of the Qingshankou Formation, and its own reservoir is relatively tight
The Fuyu oil layer has some typical characteristics of tight oil within the source, such as poor reservoir physical properties, large distribution area, low resource abundance, locally developed sweet spots, and incomplete reservoir distribution controlled by traps [1,2,3,4,5,6,7] and has the characteristics such as the reservoir pressure different from the characteristics of in-source tight oil [8]
During the Quantou Formation period when the Fuyang oil layer was developed, the Sanzhao depression has the sedimentary characteristics of multiple sources and multiple water catchment centers
Summary
The Fuyu oil layer in the Sanzhao depression is located in the northern Songliao Basin, which is close to the source rock of the Qingshankou Formation, and its own reservoir is relatively tight. It has become typical tight oil under source in China. The Fuyu oil layer has some typical characteristics of tight oil within the source, such as poor reservoir physical properties, large distribution area, low resource abundance, locally developed sweet spots, and incomplete reservoir distribution controlled by traps [1,2,3,4,5,6,7] and has the characteristics such as the reservoir pressure different from the characteristics of in-source tight oil [8]. Research on the reservoir densification and accumulation process is of great practical significance for releasing tight oil resources in the Songliao Basin and further realizing the potential of tight oil
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
