Study On Hydrocarbon Accumulation Law Of Nantun Group In The Huhenuoren Area Of Beier Depression

It is necessary to research based on the latest drilling and seismic data in order to understand oil and gas reservoirs deeper,with the deepening development of oil and gas exploration.Moreover,in recent years,the requirements for oilfield storage and production have become more and more urgent.Therefore,it is very important to study the hydrocarbon accumulation law of the Nantun group in the Huhenuoren area of Beier Depression.Based on the latest drilling data and previous research results,this paper determines the distribution range of effective source rocks in the K₁n₁ by studying the thickness of the source rock,geochemical features and the threshold of oil generation.By studying the thickness and distribution characteristic,physical characteristic and sand-ground ratio characteristic of the reservoir,it determines that the Nantun group in the Huhenuoren area is mainly a sandstone reservoir,and the limit value of the effective reservoir is also determined.By studying the fracture development characteristic,dividing the fracture system and determining the oil source fracture,combining with the thickness of the caprock and the fault contact thickness of caprock,it evaluate quantitatively vertical sealing of Nantun group.The ability of faults to seal oil and gas laterally is evaluated quantitatively by the SGR method.The high connectivity area of the sand body is judged by studying the sand-ground ratio,based on this,the dominant migration path of the oil and gas is determined.Then the main reservoir types and oil and gas distribution characteristic in the study area are analyzed.On this basis,a set of law for hydrocarbon accumulation in this area is summarized,and the favorable targets are optimized according to this law.The research achievements of this paper are mainly as follows:?1?The supplying oil condition of oil and gas accumulation is that the fault trap should be located within a range of less than 1 km from the dominant migration path of the oil and gas in the Nantun group of the Huhenuoren area.?2?The reservoir is mainly a sandstone in the Nantun group of the Huhenuoren area.The reservoir conditions of oil and gas accumulation are that the sand-ground ratio is greater than 18%,the maximum single sand body thickness is greater than 7m in the K₁n₁;and the sand-ground ratio is greater than 18%,the maximum single sand body thickness is greater than 9.6m in the K₁n₂.?3?The lateral sealing condition of oil and gas accumulation is middle and strong lateral sealing ability in the Nantun group of the Huhenuoren area.?4?The reservoir types of the Nantun group in the Huhenuoren area are mainly fault-type reservoirs.The oil and gas is mainly distributed in fault-type reservoirs near large oil source faults in a plane;and the oil and gas is mainly enriched vertically in the fault-type reservoirs that controlled by the fault of K₁n₁.?5?There are two favorable targets in the Nantun group of the Huhenuoren area.These two favorable targets are distributed in the K₁n₂.The first favorable target locates in the fault nose trap which is in the southeast direction of the well of Bei 3-1.The second favorable target locates in the fault block trap which is in the northeast direction of the well of Bei13-108-102.The above research results can be used to guide oil and gas exploration in the Nantun group of the Huhenuoren area.