Study On Sedimentary Microfacies Of Oil Layer In The Two Member Of ShaheJie Formation In Niu74 Aera

This paper is the study of the second member of the Shahejie Formation reservoir area of the Bohai Bay Basin of Liaohe Oilfield in Ciyutuo Oilfield N74 block.The sedimentology, reservoir beds sedimentology, petroleum geology theory method as a guide, in Liaohe fault depression in the northern part of the eastern depression Ciyutuo oilfield.Niuju-Qinglongtai structural belt of central second member of ShaheJie Formation reservoir as the main object of study, with geological and logging data as the basis, the second member of the Shahejie Formation reservoir of layer division and contrast, according to the characteristics of stratigraphic sequence, cyclic deposition further divided into seven sandstone group 17 layer.Analysis of sedimentary source direction, the characteristics of sand body distribution, sedimentary environment and sedimentary facies marks, the Liaohe eastern depression of bovine 74 second member of ShaheJie Formation stratum belongs to fan delta depositional system, using the regional sedimentary background, petrology characteristics,and two sub facies are mainly developed in the two part of the study area: fan delta plain and fan delta front sub facies. The single well phase and the combination well facies are analyzed, On the basis of the former, The plane distribution characteristics of sedimentary microfacies in the second member of ShaheJie Formation reservoir were studied. The controlling effect of the physical property of the sedimentary micro reservoir is discussed, It is considered that the underwater channel sand bodies of the two member of the sand layer in the study area are the most advantageous reservoir facies belts. The VII layer to V layer, II layer and I layer reservoir sand body in the study area are well developed, which is advantageous for hydrocarbon accumulation.