Study On Sand Conglomerate Reservoir In North Sag Of Bayindulan Depression

Bayindulan is located in the the Inner Mongolia Autonomous Region sag Dongwuzhumuqin West,is an important source of two sag of Erlian basin.Since the discovery of oil and gas in the region in 1977,opened the prelude to exploration.few studies have been made on the understanding of reservoir and sedimentary environment.In order to further exploration and development,this paper analyzes the sedimentary environment and sedimentary evolution of the study area by using sequence stratigraphy:(1)In this paper,the study area is divided into two sequences by means of the combination of sequence stratigraphy and genetic stratigraphy,namely,the late Paleozoic giant sequence(ESQ1)and the Meso Cenozoic giant sequence(ESQ2),and the Tg is the interface.Among them,the Mesozoic Cenozoic sequence can be divided into 3 super sequences,the Jurassic super sequence(LSQ1),the Cretaceous super sequence(LSQ2)and the ancient Neogene(LSQ3).The interface of super sequence is T11 and T2.(2)According to the study area(exploration area)were observed within all 28 wells cores,with the lithology characteristics,sedimentary facies,seismic and logging characteristics,of which 5 wells were analyzed.Single well sedimentary characteristics in northern Dulan sag of Bayan Trough since Arxan to Teng Ko Erh two group identified 5 a large,11 subfacies and 22 microfacies and a four section,a two section and Teng Teng sedimentary environment analysis.(3)There are two sets of clastic reservoirs in the study area,that is,the formation of the conglomerate and Teng Ko Erh formation.The structure of this area is low and the sorting is poor.The main types of the rock are feldspathic sandstone.The porosity and permeability are poor,which belongs to medium low porosity,low permeability and low permeability reservoir.The types of reservoir space are intergranular pore and intragranular dissolved pore.Although the reservoir in the north depression of Bayindulan sag is poor in physical property,it is rich in oil and gas resources and has great potential for exploration.