Analysis Of Pore Type And Its Main Controlling Factors Of Sand-Conglomerate Reservoirs In The Western Slope Of Mahu,Junggar Basin

The Permian source rocks in the Mahu sag are developed,and the oil-producing potential is huge.The Triassic Baikouquan Formation has discovered abundant oil reservoirs.The western slope of the Mahu Lake is a reservoir sand body development area,and it is also the main source of the Mahu area.In the direction,the current understanding of reservoir research in this area has not been unified,and the differences are serious.Especially the pore distribution characteristics of glutenite reservoirs are not clear,so it is of great significance to carry out the research in this paper.With the emergence of the current energy crisis,people are paying more and more attention to oil research,and the scale of oil and gas exploration is also increasing.Since the gravel reservoir is an important reservoir that stores oil and gas,the oil industry has carried out more attention.The salient characteristics of sandy conglomerate reservoirs are near source and rapid accumulation.Relatively speaking,the lithology of such reservoirs is relatively complicated.In general,the thickness of this type of reservoir is relatively large,and its effective sand body is very It is difficult to identify and the reservoir heterogeneity is very strong,so people's understanding of the development law of such erosion pores is still not clear enough.Strengthening the research on the development law of erosion pores has gradually become the study of sandy conglomerate reservoirs New direction.This article takes the Triassic Baikouquan sand and conglomerate reservoir in the Mahu west slope belt of Junggar Basin as the research object,and the key research direction is to discuss in detail the sedimentary development and diagenesis of the conglomerate and the reservoir properties and control factors,and further strengthen The pore types of the conglomerate reservoir and the limited development of the reservoir are studied.In addition,the formation mechanism and main controlling factors of the reservoir are also discussed.The purpose of this study is to clearly understand the reservoir genetic model,and further strengthen the understanding of favorable sandstone conglomerate reservoir development rules,and ultimately better prove the oil and gas development and reserves in the region,and provide oil and gas exploration for the region.Provide some reference.The key research blocks this time are the Aihu 2 well area and the Ma 18 well area and the Mahu 1 well area.The reservoirs of these three well areas are mainly sandstone conglomerate reservoirs,and there are still a certain amount of Unequal-grainedsandstones and medium conglomerates show the obvious characteristics of "low porosity and low permeability".According to the existing microphotographs and the laboratory analysis data of the study area,it can be found that the dissolution phenomenon of the Baikouquan Formation is relatively strong,and the three well areas are basically developed with intergranular pores and primary intergranular pores.Very little development.The lithofacies of the Baikouquan Formation in the Marxi area can be divided into5 types: traction flow conglomerate facies,gravity flow conglomerate facies,conglomerate sandstone facies,sandstone facies and mudstone facies.The secondary dissolution pores and microfractures are the main ones,and the proportion of primary intergranular pores is relatively low;the traction flow grit is mainly dominated by primary intergranular pores,and the dissolution pores are mainly the grain boundary dissolution pores,and the proportion of secondary dissolution pores is Lower.The existence of micro-cracks can promote the development of dissolution.Compared with traction flow sand and conglomerate,gravity flow sand and conglomerate micro-cracks are more developed.The same is the traction flow sand-conglomerate interval,the physical properties of Well Ma 18 are the best,the physical properties of Well Ma 1 are the second,and the wells of Well Ai 2 are poor;the microscopic reason for the above physical property difference is the different types of storage space,among which Well 18 is mainly intragranular dissolution pores,remaining intergranular pores and shrinkage pores;Well Aihu 2 is mainly intragranular dissolution pores and shrinkage pores,and Well Mahu 1is mainly intragranular dissolution pores.