The Relevant To The Interaction Between Characteristic Of Bedding Fracture And Oil Charging In Lucaogou Formation,Jimusar Sag

A lot of bedding fractures develop in the upper and lower dessert of the tight reservoir of the Lucaogou formation in Jimsar sag,and the bedding fractures as the migration channel and reservoir have a positive influence on the tight oil reservoirs in the study area.But at present,the research on bedding fractures at home and abroad remains to be further studied.In this paper,the features of the tight oil and the lower desserts of the Lucaogou formation in Jimsar sag are analyzed.The characteristics of the bedding and structural fractures in the study area are compared and identified by means of field outcrop observation,core photo observation,cast thin film,scanning electron microscope and conventional logging and imaging logging recognition.The causes,main controlling factors and the opening and closing of the bedding fractures were studied by scanning electron microscopy,energy spectrum analyzer,carbon and oxygen isotopes,fluid inclusions,acoustic emission and other experimental and basic geological data.The relationship between the bedding fractures and the oil gas filling in the study area was studied comprehensively,and the comprehensive coupling relationship was studied.Through acoustic emission experiment,it was found that the types of fractures related to the dense reservoir include bedding and structural fractures,and the bedding fractures are dominant in quantity and oiliness.The study shows that the causes of bedding fractures are mainly affected by lithology,organic matter abundance,particle size,thickness of bedding and sedimentary environment.Among them,the main lithology of developmental bedding fractures can be divided into dolomite,sandstone and mudstone;the higher the content of dolomite,the smaller the sandstone particles,the higher the abundance of organic matter in the mudstone layer,the more the bedding fractures,the smaller the thickness of the monolayer,the higher the level of the bedding seams,and the development degree of the bedding fractures of the lower dessert segment with the delta front as the main sedimentary microfacies.It is higher than the beaches and shallow lakes,which are the main desserts.The relationship between the bedding fractures and the oil filling in the study area is studied by acoustic emission.The bedding fractures in the study area are divided into two phases,which are the bedding fractures formed by the three Indosinian tectonic movement and the North East to the north to the north of the Cretaceous tectonic movement.Through the analysis of the K-Ar isotopes and oil and gas inclusions in the bedding seams,the oil and gas filling events have occurred in the two phase of bedding fractures.From the late three fold to the early Jurassic period,They were from late Triassic to early Jurassic and early Cretaceous to late Cretaceous.