Study Of Potassium-rich Brine Resources Evaluation Methods In Sichuan Basin

Potassium is one of an important shortage mineral in China.Find potassium salt deposit is an urgent task in front of our geologists.Most of China's potash resources has been found that the causes is formation of continental,But in the world,the main source of world's potash resources is formation of marine.To solve the problem of shortage of potash resources,we need to accelerate the development of marine potash(including deep potassium-rich brine)surveying and resource evaluation.Sichuan Basin is an important brine areas,which has rich deep brine resources.It has brine distribution system from Sinian to Cretaceous layers.Its middle-lower Triassic salt-based system is an important target for looking for marine carbonate type of potash(potassium-rich brine).High-grade potassium-rich brine has been discoveried in Xuanhan constructed in 1980 and in Pingluoba construct in 1991,which show good prospects for potash.On the basis of a large collection of brine storage structure focused on drilling data.Analysis the major elements,trace elements and isotope geochemistry of Triassic potassium-rich brine of Sichuan Basin.We found that there is a contradiction of geochemical system of potassium-rich brine with Pingluoba structure and Xuanhan structure,which show both deposition and leaching characteristics.On this basis,this paper discussed the Sichuan Basin potassium-rich brine genetic model.This paper considered that the primary sedimentary sea should be further divided with the role of the deposition of potassium.The leaching and dolomitization may play a more important role role than ever in the formation of the potassium-rich brine.On the basis of these findings,this paper establish a comprehensive genetic model of K-rich,and propose metallogenic elements and evaluation elements of potassium-rich brine,which provide the basis for the amount of potassium-rich brine resource evaluation.This paper studies the deep potassium-rich brine resource evaluation methods,and proposes resource evaluation method system composed of three evaluation methods,to adapt the evaluation needs of different explored level of the reservoir structure.Among them,the volumetric method has long been the main method in potassium-rich brine resource calculation,which calculation principle and calculation process is simple,and it is suitable for the exploration area of medium degree.3D geological modeling method is an improved algorithm which is proposed for the inadequate of traditional volume method.It still retains the volumetric method evaluation ideas,but the use of deep geological data is more efficient,and it can obtain the better result than the volumetric method,and it is more suitable for a high degree of exploration areas.Its essence is analog the geological conditions of environment and mineralization,thereby obtaining resources,which is suitable for the lower level of the exploration areas.On the basis of resource method,based on VC + + and Opengl developed a deep brine resource evaluation software BrineEvaluator,this software provide a standard and objective platform for brine resources evaluate.This paper uses the resources evaluation methods and evaluation software evaluates some typical reserve construction's resources in Sichuan Basin.Moxi constructed uses the three-dimensional geological modeling method.Pingluoba structure and Xuanhan structure uses the volumetric method.Ziliujing structe,Changyuanchang structure and Dengjingguan structure use the deposit model method.The results show that three-dimensional geological modeling method is an effective improve method on the volume method,the deposit method is an inferred model based on the evaluation elements.Thesis of resources evaluation methodology can be effectively applied to different levels of exploration area.This paper discusses the cause mode of deep potassium-rich brine in the Sichuan Basin.Establish a more rational resource evaluation system.Form evaluation software which is accurate and easy to use.There is a more positive sense for the target of the large sedimentary basins potassium-rich brine resource evaluation.