Sedimentary facies analyses based on well drilling and logging data from Devonian Kerziertag Formation in Bashitop area of Tarim Basin

Sedimentary facies of the Devonian Kerziertag Formation in Bashitop area of the Tarim Basin have been studied with drilling and logging sedimentary facies analysis method.The Kerziertag Formation in the study area was formed in wave-dominated barrier-free clastic littoral depositional environment.The foreshore subfacies include 3 microfacies such as beach,groove and sand dam.The petroleum shows of actual drilling in single well have indicated that the beach microfacies are the most abundant in petroleum,and the coastal sand dam near to beach takes the second place.As to the coastal sand dam in the upper near shore,it interbeds with the lower near shore and is also favorable for petroleum preservation even though its physical property is poor.