Sedimentary Facies And Sand Body Distribution Of The 1st Member Of The Su 28 Well Area In The Sulige Gas Field

This paper selects member 1 of Shanxi formation in Su 28 area in Sulige gas field as studied object.Using the subjects of Sedimentology,Reservoir geology and other theories,combined with drilling,logging,core observation,micro-section identification and other informations,refered to the previous research results,we try to study the sedimentary facies and sand distribution of the objective interval in the study area.Several achievements as follow are obtained:Combined with the existing stratigraphic classification scheme,according to the curve combination characteristic,based on the thickness and cycle of comparative law,the member 1 of Shanxi formation are divided into 3 sub-member,and compared within the hole district,laid the foundation for subsequent research work.Referring to the sedimentary facies marks,we have come to the conclude that the faces of member 1 of Shanxi formation belong to meandering delta plain subfacies in the study area,and further divide into channel lag subfacies,point bar subfacies,channel fill subfacies,abandoned channel subfacies,crevasse channel subfacies,sub-channel fill subfacies,natural levee subfacies,crevasse splay subfacies,interchannel subfacies and etc.The sand development controlled completely by sedimentary facies and are distributed in banded from north to south.The channel lag,point bar and channel fill sand bodies are framework of oil and gas reservoir sand.Through reservoir quantitative research,it is concluded that:the width of river channel is 378?1284 meters,simple point bar sand body is 956?1638 meters long and width is 344?1145 meters.Area of more than 160 Wells of reservoir thickness statistical results show that the reservoir of the Shan 13 sub-member of Shanxi formation is most vegetal,by contrary which of Shan 11 sub-member of Shanxi formation is worst vegetal.In the end,the location of favorable zone developld in the studied area is divided into four zones by the quality of reservoir,among which the Zone I and Zone II is the favorable zone to deploy horizontal well.