Silurian Kalpintag Formation Sedimentary Sequence Development, Evolution And Favorable Zones Prediction Of The Northern Tarim Uplift

The north tarim uplift is an important oil and gas-bearing district of tarim basin. With the guidance of the theory of Sedimentology, High Resolution Sequence Stratigraphy,Structural Geology and based on 2D seismic reflection data, well loggings and cores, silurian kepingtage group is divided into two third-order sequences SQ_Skp1 and SQ_skp2, which is bonded by unconformities characterized by local erosion or onlap contacts and its corresponding conformity surfaces. According main sea-flooding surface and subsea-flooding surface, kepingtage group is divided into systems tracts and fourth-order sequences, the establishment of high resolution sequence framework provides an important chronostratigraphic correlation framework.At establishment of chronostratigraphic correlation framework ,according to single well facies analysis, connect well contrast and well seismic contrast, the sedimentary facies and the sand body distribution is researched to open out the sedimentary system timespace collocation regulation. The research indicates that SQ_Skp1 mainly with deeply green shallow sea shelf mudstone deposition. SQ_Skp2 is the estuary - tidal flat system, which distributes mainly in the LST and TST. Castal beach system and River - delta system mainly distributes in the HST.The research of palaeogeomorphic evolvement analysis indicates that the palaeogeomorphic has certain control influence towards studying area depositing system of timespace collocation regulation.In SQ_Skp1 deposition period the palaeogeomorphic presented south north direction and west high east low characteristic.In SQ_Skp2 later periods the palaeogeomorphic took place a change, it presented north east direction and northwest thick southeast thin characteristic.With the central uplift formation, total north tarim uplift presented a southern slope zone, the central low-uplift zone and the east depression characteristic,which provide an important reference for the comprehensive research deposition system timespace collocation regulation of north tarim uplift kepingtage group with different Sequence and different systems tracts.The beneficial facies areas of tarim uplift Silurian Kepingtage group are the delta-front near bar facies , front littoral facies and up-near littoral facies,which distribute mainly in the yimai 34 well areas and Hade low uplift areas .