The Forming Condition And Resource Potential Analysis Of Tight Oil And Gas In Sanjiang Basin

As one kind of unconventional oil and gas,tight oil and gas has gradually attracted the attention of the world,and has increasingly become the concentration of the global exploration and development.Now China is second only to the United States that vigorously explores and develops these resources.Therefore,the Chinese government now explores and evaluates almost all of the basins afresh,hoping to solve the increasing energy requirement.Sanjiang Basin is located in the north of Heilongjiang Province,and its geological structure is complicated.Based on the dissection of typically domestic and international tight oil and gas reservoirs,establish a suitable evaluation criteria for the study area,this paper analyzes its formation conditions and resource potential of tight oil and gas in Sanjiang Basin,implements the prospect of tight and oil gas resources in the study area and points out the direction of exploration for the next step.According to the basic theory of tectonic and petroleum geology,combined with the drilling data and core data,etc.,the paper analyzes the characteristics of the target horizon,generation,reservoir,and cap in the study area in detail,figures out the main factors that control the formation of tight oil and gas.The research shows that the main source rock strata in Sanjiang Basin are Chengzihe Formation and Muling Formation in Suibin Depression.The type of organic matter is mainly ?2~? type,with a small amount of ?1type.Most of the organic materials in Chengzihe Formation is generally in the over-mature stage,while the Muling Formation is almost in a stage of mature to high mature.Besides,the main reservoirs are the sandstone strata of Chengzihe Formation and Muling Formation.The study area covers two main cap rocks of Chengzihe Formation and Muling Formation,whose lithology is dominated by mudstone.Favorable areas can be determined according to the four principles of tight oil and gas accumulation.Utilizing simulation of hydrocarbon generation,volume and analogy methods comprehensively to calculate the quantity of tight oil and gas resource,and the final result of tight oil resource of Sanjiang Basin is 2713×10~4t,and the tight gas resouce is 126.3×10~8m~3.