The Research Of Gas Resource Characteristics And The Sustainable Development In The Northeastern Sichuan Basin

The gas resources in the northeastern Sichuan basin is the object investigated inthis paper. Taking multidisciplinary crossing theories as guide, basing on the gasreservoir geological features and the high sulphur content feature in the district,introducing the opinion of the sustainable development, two questions, theexploitation and utilization of the gas resource in the northeastern Sichuan basin,specially in Dazhou and realization of the sustainable development of economy,society and environment in the old regions, are expounded here and some conclusionsare gotten as follow:On the basis of the comprehensive study of petrology, mineralogy, reservoirsedimentology and isotope geochemistry, the sedimentary facies of Permian andTriassic carbonate formation are analysed and the corresponding sedimentationmodels are formed;The plane distribution of sedimentary facies are drawed and thegeometric shape, distribution and evolution of the facies during the differentdevolopment period are discussed; The characteristics of reservoir in the ChangxingFormation and Feixianguan Formation are analysed and it is considered thatdolomitization, corrosion and tectonic disruption are constructive diageneses andcementation and compaction are destructive diageneses. It is put forward for the firsttime that the reservoir is the result of multiphasic and multistage burieddolomitization. Owing to TSR event in deep embedding corrosion effect, the highquality reservoirs in the Changxing Formation and Feixianguan Formation in thenortheastern Sichuan basin were formed and gas resources were accumulated here.Analysed the formation condition and the origin mechanism of the high-H₂S gas inthe northeastern Sichuan basin, gypse is the requirement of forming H₂S,and thetemperature reservoir experienced and the components of hydrocarbon are key factorsof controlling the TSR reaction course and forming H₂S.Moreover the types of reservoir rocks and its space composite relation with evaporates and the seal ability ofcaprock are also the important factors of forming H₂S.So it is more difficult anddangerous for exploration and development in the northeastern Sichuan basin becauseof the high sulphur content and high-pressure characteristic and it maybe has anegative influence on ecological environment.The distribution of gas resources in Dazhou and other places the northeasternSichuan basin is elaborated. It is considered that the ample reserve of gas is the baseof realizing the local economy and society sustainable development and the highsulphur content gas resources can be synthetically utilized in urban fuel, chemicalindustry, generate electricity and sulfur byproducts and other aspects for a long time;Taking the sustainable development theory as a guide, it is put forward that moreeffective utilization of the gas is meaningful in improving the local energyconsumption structure, protecting ecological environment, increasing economicbenefit and realizing the local economy and society sustainable development.At last, the exploitation and utilization of the gas resource in the northeasternSichuan basin, specially in Dazhou and the possible problems in the development ofgas industry are thoroughly analysed, and the constructive proposal and the strategyare proposed. It will be helpful in government decisions as well as the the sustainabledevelopment of economy, society and environment in the northeastern Sichuan basin,even in other places in Sichuan and Chongqing.