Identification of abnormal high temperature background and the influence mechanism on physical property evolution of sandstone reservoir

Abstract

The evolution of reservoir physical properties is very important for the prediction of sweet spots in oil and gas exploration and development. As one of the important factors of physical property evolution，the abnormal high temperature in the formation has a very important influence on the physical property and diagenetic evolution of regional reservoirs，but the relevant influence mechanism has not been fully revealed. In order to specifically discuss the mechanism of the influence of abnormal high temperature on the physical property evolution of deep-water sandstone reservoirs，the coupling effect of different thermal fluids in different regions on the lithology，physical property and diagenetic evolution of reservoirs is analyzed in depth by systematically investigating the literature and data related to the lithology，physical property and diagenetic evolution of reservoirs under the global high temperature background. It is found that the abnormal high temperature mainly reflects on the physical property evolution of the reservoir：The high temperature background accelerates the intensity of compaction，promotes the development of secondary pores or the transformation of primary pores to secondary pores and micropores，accelerates the chemical cementation reaction rate and the diagenetic evolution process，and then has a great impact on the physical properties. By summarizing the previous research progress on reservoir diagenetic evolution under thermal background，this paper discusses the influence mechanism of thermal background on reservoir physical properties and diagenetic evolution，and analyzes the influence of abnormal high temperature background in local areas. This research can provide new ideas and theoretical support for the subsequent prediction of reservoir sweet spots.