异常高温背景识别及对砂岩储层物性演化的影响机制

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

储层物性演化对油气勘探开发中甜点的预测至关重要。作为控制储层物性演化的重要因素之一,异常高温对区域储层物性及成岩演化有着十分重要的影响,但相关影响机制尚未完全揭示。为此有针对性地探讨异常高温对砂岩储层物性演化的影响机制,通过系统调研全球高温背景下储层的岩性、物性、成岩演化等相关文献资料,进而深入剖析不同地区不同热流体与储层岩性、物性及成岩演化的耦合作用。研究发现,异常高温对储层物性演化的影响主要体现在:高温背景加速压实作用的强度,促进次生孔隙的发育或原生孔隙向次生孔隙与微孔隙的转化,也会使化学胶结反应速率加快,加速成岩演化进程,进而对物性造成极大影响。通过总结归纳前人对热背景下的储层成岩演化研究进展,探讨了热背景对储层物性及成岩演化的影响机制,同时对局部地区存在的异常高温背景的影响进行了分析。研究可为后续储层甜点预测提供新的思路及理论支撑。

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.