The Favorable Exploration Of Reservoir Area Neogene In The Youshashan-Dawusi Area,Qaidam Basin

Comprehensively utilizing sedimentary petrology,lithofacies paleogeography,petroleum geology,mineral petrology and organic geochemistry,sedimentary facies characteristics,structural characteristics and sedimentary system evolution and characteristics of reservoir have been researched in the Youshashan-Dawusi of Qaidam Basin.Combining with hydrocarbon generation and petroleum migration,characteristics of reservoir developing,analysis the control factors,a favorable reservoir exploration region is further predicted.1.The Youshashan-Dawusi area has developed variety sedimentary genesis of clastic rocks reservoirs,which are main system of the braided delta sandstone of fluviolacustrine sedimentary and the powder ~ fine sandstone reservoir of the shoreshallow lake sedimentary.2.The depocenter of structural belt in various periods of evolution and migration is from west to east.And the main types of sedimentary facies are braided delta plain braided delta front,shore-shallow lake sedimentary,which water has a tendency to gradually become shallow from top to bottom and from the east side to the west.3.Background on a gentle slope for the overall development in the rearch area is river-lake sedimentary system.From the up Ganchaigou group to up Youshashan group formation period of sedimentary facies evolution,the basin water back away and provenance propels from northwest to southeast gradually.From the largely developed shore shallow lake-fairly deep lake and beach bar facies of the up Ganchaigou period in the work area,and then delta front and beach bar facies of down Youshashan perio,until the largely developed braided delta front deposition and beach bar faciethe of up Youshashan period,the shore-shallow lake sedimentary environment is further reducing.4.Comprehensive analysis of the test results of abundance of the organic matter and Rock pyrolysis,the research area is divided into two high-quality hydrocarbon source rocks distribution zone: Yingdong number two,Yingdong number one area is the next step of reservoir favorable exploration targets...