Main Control Factors And Distribution Of Shale Oil Enrichmentin In Da'an Area Of Southern Songliao Basin

As one of the important development directions in the energy field,shale oil and gas has a huge potential for resources.With the large-scale successful exploration and development of shale gas,people are further exploring the development of shale oil.The Da'an area of Songliao Basin in China is rich in shale oil resources and has great exploration potential.The Da'an area of Songliao Basin in China is rich in shale oil resources and has great exploration potential.The study of shale oil enrichment in Da'an area not only provides the technology and resource base for shale oil exploration in this area,but also further enriches the theory of shale oil exploration and development.This paper uses core data and analytical test data,combined with previous research results and old well review,to analyze and study the oil shale oil enrichment conditions,enrichment rules,enrichment main control factors and favorable areas in Daan District.Carry out detailed research on key indicators such as source rocks,oil sources,reservoirs,fractures and micro-fractures,and establish Daan from existing geological,seismic,analytical test and other data as well as shale analysis methods,petroleum geology and other methods.Conditions of shale oil and gas accumulation in the region.From the shale thickness,organic matter abundance,type and maturity,and fracture characteristics,systematically analyze the main controlling factors of accumulation and accumulation in the Daan area.Based on 6 parameters such as TOC,Ro,high-quality shale effective thickness,brittleness index,porosity and shale oil mobility,a shale oil favorable area selection criterion was constructed.Based on this standard,the Qingyi and Qing2 sections of the Daan area were selected The effective enrichment area indicates the main controlling factors of mud shale oil enrichment in the study area,and establishes a technical method for evaluating the shale oil reservoir resources suitable for the study area,revealing the resource potential of the Daan area.It provides a certain technical basis for further research on mud shale oil.According to the research of this project and the previous achievements are summarized as follows:(1)The shale with an organic carbon content> 2.0% and a maturity of 0.5% <Ro <1.2% is determined as high-quality shale.(2)The shale pore types in the study area include inorganic intergranular pores,intergranular pores,dissolution pores,organic pores and microfractures.The radius of the pores is tens to hundreds of nanometers;according to the established reservoir classification standards,the study area Four types of shale reservoirs are divided,and the characteristics of pore space variation are revealed.(3)Revealed the spatial distribution law of high-qualityshale brittleness index in Qing1 and Qing2.(4)Based on the Monte Carlo method,using the pyrolysis parameter method,the shale oil resources in the high-quality shale intervals of the Qing 1 and Qing 2 members were calculated.(5)Specify the hydrocarbon generation foundation,fractures and preservation conditions as the three main controlling factors of shale oil enrichment in the source,based on TOC,Ro,effective thickness of high-quality shale,brittleness index,porosity,and shale oil mobility 6 These parameters constitute the selection criteria for favorable areas of shale oil.