It is found by dissecting the delta front sheet sands in Daqing Oilfield that though it is at outer front facies belt, there exists obvious characteristics of a water course in sheet sands.
大庆油田三角洲前缘席状砂解剖发现，即使在外前缘相带，席状砂仍然具明显的水道特征。
2
Relationship between sedimentary facies and hydrocarbon distribution shows that most favorable oil and gas accumulation zones occur in the mouth bar, distal bar and sand sheet.