Abstract
The petroleum-rich Liaodong Bay basin in Northeast China consists of three depressions (sub-basins) and two uplifts. The Liaozhong depression is the main area of hydrocarbon generation. To date, oil and gas production is mostly from Liaoxi uplift. Early exploration efforts in the deeper portion of the basin indicated that the reservoir quality was poor. However, this study indicates that four distinct zones of secondary porosity and permeability develop in all the depressions and uplifts. The zones of secondary porosity in the depression are relatively deeper than those depths of the same zones in the uplift. Correlations among porosity, permeability, diagenetic stages, evolution of clay minerals, changes in pressure, and thermal maturation indicate the four distinct secondary porosity zones are related to diagenetic evolution, organic matter evolution, clay minerals transformation, overpressure and early hydrocarbon charge. The secondary porosity zones were mainly attributed to the dissolution of the carbonate cement, feldspar and unstable minerals, hydrocarbon generation, and rapid transformation of clay minerals. This result implies that the potential reservoirs with good quality are present in the deeper overpressured portions of the Liaozhong depression.
Sign-in/Register to access full text options 
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.
