Study On The Favorable Zone Of The Shawan Formation In Neogene Of Chepaizi Areas

The oil and gas resources in Junggar Basin has a large potential, it's a important oil and gas area in the northwest of our country, it has become one of the strategic replacement to China's onshore oil resources. Located at the western margin of the Junggar Basin, the Chepaizi raised oil and gas and to see a good show in the early exploration, comprehensive analysis of it has good conditions for oil and gas resources and exploration prospects. The thesis is focused on the Shawan formation of Chepaizi areas. Using Sequence stratigraphy, sedimentology, and other methods and theories, Established sequence stratigraphic framework, sedimentary system research, seismic reservoir prediction and reservoir pore structure analysis, and then the type of reservoir would be dicided. Based on these studies, by description of favorable sand, analysis of trap type, distribution of Combination of reservoir, predicted the distribution of favorable areas and subtle reservoirs, Thus specified the direction of exploration.Several achievements have been obtained as follows:First, realized the consistency of sequence stratigraphy divide about of seismic, logging, drilling information, put Shawan formation into two three sequence, established sequence stratigraphic framework.Second, there is braided delta front intrafacies in sequenceâ… , and it is subdivided to distributary channel underwater, distal bar, bay between distributary channels underwater. There is offshore-shallow lacustrine intrafacies in sequenceâ…¡, and beach bar and mud in offshore-shallow lake are subdivided from it. distributary channel underwater and beach bar have good exploration potential.Third, scrap components contains quartz, feldspar, mica and lithic. Compaction, cementation, alternation, dissolution, and denudation mainly consists of diagenesis. The pore of conglomerate is the pore mianly between granule, and the pore inside granule and the the pore as micro-fracture is secondary. Megalospore and throat, and other 3 type of pore structure in microscope are generalized. And classified reservoirs into four types from good to bad.Fourth, Pai 6 wells on the three-dimensional seismic areas and the western two-dimensional seismic areas Shawan formation sandstone was predicted, sand mainly distributed in central and southern study area.Fifth, there were found six favorable zone, and Among them, the favorable zone 2 and zone 3 conditions conducive to the most advantageous With the actual exploration proved that prediction results will be ideal.