The Diagenesis Research On The West Part Of The Northern Margin In The Qaidam Basinesis

This article eyes on the diagenesis research of Tertiary Reservoirs on the west part of the Northern margin in the Qaidam basin, under the guidance of sedimentology and geochemistry theories, basing on the date analysis of outcrop drilling, core,slice, x-ray diffraction ,SEM and ,reservoir Lithological, the author researched the diagenesis and reservoir characteristics deeply, which is very important for the further exploration and reducance the cost of exploration../ The rock in where is certain area is low component maturity and low content of feldspar, high content of lithic, and the main type is lithic arkoses and feldspar litharenite, Furthermore the sandrock in where the area is high textural mature, especially much low content of matrix and good sorting of matrix. There is evident reducance of sandrock textural mature from the down stratum to up layer of teriary. There is main type of Diagoenesis, including mainly compaction, cementation, Silty filling ,dissolution and Metasomatism which first two was most primary of Diagenesis element and quality control element to sandrock on the reservoir .Features and diagenesis is stuied in detail. In this area, and componential lmaturities is lower and the Lithological types are mostly lithic arkoses and feldspar litharenite. The first important is feldsparlitharenite, the less important is lithic arkoses.In this area, the textural maturity is higher; the matrix is lower and the sorting fragmental. From down to top textural maturity is increase of the whole. Diagoenesis types: mainly compaction, cementation, Silty filling ,dissolution and Metasomatism. The former two functions are the main reasons of reservoir quality. We have got the result:1) It is most important element for researching reservoir sandstone sandrock that compaction to destroy the diagoenes,the room took 58% out of all lost space of reservoir room,further the aonther most important element for contorl the quality of the reservoir room of tertiary on the west part of the Northern margin of the Qaidam basin, it control the layot of the pertity on plane and portrait 's certain area.2) The amount of cementation of carbonate on tertiary on the west part of the Northern margin of Qaidam basin is marjor partation, it is the control element of pertity on the certain research area.3) Since this area the major climate is dry or dry-sim dry, it is reason the high quatity of ilite and low quatity of chlorite and kaolinite on the certain geology lay, also the limit interfet element to the pertity of area.4) Cause the low quatity of chloriteand and kaolinite on the certain geology lay, the hole has been control in certain range on the research area, which is top urgent to the hole.5) Samilar condition on the low quatity of quartz of cementation, cause the quatity the quartz was able to contorl the pertity on the tertiary reservoirs on the west part of the Northern margin on the certain research area.