松辽盆地北部页岩储层地质评价及关键技术研究

Study on Geological Evaluation and Key Technologies for Shale Reservoirs in Northern Songliao Basin

近年来,松辽盆地北部页岩油的勘探开发不断取得突破,目前缺乏对松辽盆地北部页岩储层的成藏地质条件及油气藏特征的分析和总结。为此,通过对国内外页岩油气藏勘探开发技术进行调研,综合页岩储层地质和工程资料开展了埋深、厚度、储层条件等6个参数的对比分析。研究结果表明:具有商业开发价值的页岩油气藏有利区应为富含有机质的高压页岩油气藏,此类页岩油气藏具有构造稳定、地层压力系数大、优质页岩厚度大等特征。同时调研了地质条件对于页岩油气藏开发的影响,认为热演化程度、脆性、埋深等对于页岩油气的保存有利,钻井和选区时应尽量在裂缝发育区,以便于进行储层改造;同时页岩油气藏在层序地层、地球化学特征以及生产特征具有一定的共同点。在开发方面系统研究页岩油气藏在钻完井、压裂改造、产量生产优化等油气藏开发新技术和未来发展方向。研究结果对松辽盆地的页岩油气藏勘探开发和规模建产提供一定的借鉴,也为后期的松辽盆地页岩油气选区及井位部署提供参考依据。

In recent years,breakthroughs have been made in the exploration and development of shale oil in Northern Songliao Basin.Currently,there is a lack of analysis and summary of the geological conditions for hydrocarbon accumulation and the characteristics of oil and gas reservoirs in Northern part Songliao Basin.To this end,based on the investigation on the exploration and development technologies of shale oil and gas reservoirs at home and abroad,a comparative analysis of six parameters,including burial depth,thickness and reservoir conditions,was performed in combination with the geological and engineering data of shale reservoirs.The results of the study showed that the favorable areas in shale oil and gas reservoirs with high value for commercial development are high pressure shale oil and gas reservoirs rich in organic substances,which are characterized by tectonic stability,high formation pressure coefficient and thick high quality shale.The impact of geological conditions on the development of shale oil and gas reservoirs was also investigated.It was concluded that the degree of thermal evolution,brittleness and burial depth were favorable to the preservation of shale oil and gas,and that drilling and zoning should be done in fractured areas as far as possible to facilitate reservoir stimulation.At the same time,there are some similarities in sequence stratigraphy,geochemical characteristics and production characteristics of shale reservoirs.In terms of development,new technologies and future development of shale oil and gas reservoirs,such as drilling and completion,fracturing stimulation and production optimization,were systematically studied.There is much for reference of the study results to the exploration and development of shale oil and gas reservoirs and large-scale production of Songliao Basin,and to the later selection and well deployment of shale oil and gas zones in Songliao Basin.