Lake Sedimentary And Evolution Characteristics Of Lower Cretaceous In South Chifeng Basin

By the analysis of field measured sections,combining with the drilling and well logging material,using sequence stratigraphy,sedimentology,as well as paleogeography’s basic theory and methods,makes a systematically research of the lower cretaceous lake sedimentary in the researched area.Recognizes the coastal shallow-lake facies,deep lake facies,fan delta facies,lake delta facies from Jiufotang fm and Shahai fm of the researched area,and makes a elaboration to their distribution characteristic;Recognizes three sequence interfaces in the lower cretaceous of researched area,divide the researched area’s sedimentary strata into Sql,Sq2,Sq3 three third-order sequences,and establishes a sequence stratigraphic framework for each sequence;makes a conclusion that Jiufotang fm to Fuxin fm deposion period is a complete sedimentary environment evolutional process,the Jiufotang fm deposion period is lake development period,the lower Shahai fm period is lake period,the upper Shahai fm period is lake heyday period,and the Fuxin fm period is the lake perish period.