The revolutionary transformation from oil generation to oil production in the Cretaceous Gulong shale in Songliao basin and its strategic significance
This paper focuses on the latest progress of oil generation,storage,production and engineering transformation of Gulong shale oil in Songliao Basin and holds that the high oil generation and low hydrocarbon expulsion efficiency of Gulong shale provides important material basis for oil production.The micro-nano pore and fracture combination system widely developed in Gulong shale provides the spatial basis for shale oil reservoir.In terms of engineering transformation,engineering technologies such as increasing the proportion of guanidine adhesive fracturing fluid,using silt slug to plug micro-fractures near the well,reducing the number of clusters in the section,increasing the construction displacement,and using stress interference in a positive way are proposed to realize the joint network concept of"controlling near and expanding far"and improve the scale and degree of transformation.By quantifying the process and sequence of energy release through hydraulic elastic flooding,rock and fluid elastic flooding,and dissolved gas flooding,reasonable control of pressure and orderly release of elastic energy can be achieved to control the decline of volume development.Although the revolutionary transformation of continental facies shale oil from"oil generation"to"oil production"still faces major challenges in theoretical mechanism,the engineering technologies and benefit development,continental facies shale oilin a huge scale is one of the important goals to ensure national energy security in the future.
Songliao basinGulong shale oilenrichment ruleoil generationoil production
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