The Hure Sand West Block N-<sub> 1 </ Sub>-n <sub> 2 </ Sub> 1 Reservoir Comprehensive Geological Study

In the full collection of seismic,geology,well logging,Analysis Laboratory and previous research on the the region and work zone,strata correlation,tectonic analysis,sedimentary facies analysis,reservoir study and evaluation of oil and gas distribution controlling factors in shaxi N₁-N_2¹reservoir was studied.4 base standard and the total 11 oil-bearings and 187 sublayers was identified.Basis on this,the work zone tectonic analysis and fault interpretation and fault Closed was studied.The N₁-N_2¹reservoir in shaxi is an breaking nose structure with was controlled byⅪ,Ⅵfault and complicated by other faults.There are 17 fault in Objective layer,Which(1),(2),(3),(5),(6),(7),(8)fault closed better;Ⅱfault and(9)fault closed medium.One of the important reasons why the footwall has the low output is migration history that petroleum passing footwall entered the upper side.in-depth analysis of the study area reservoir typical sedimentary facies and subfacies,microfacies types,analysis of longitudinal phase sequence features,and research on the horizontal distribution of sedimentary systems and changes in law;the shaxi N₁-N_2¹reservoir develops braided river delta and lake facies.it is a Anti-cycle and bottom-up the lake to the braided river delta.Source mainly from the west and the North West,which both controlled by north river Alar deposition system.In-depth study the shaxi N₁-N_2¹reservoir clastic rock reservoir characteristics, diagenesis,physical characteristics.lt is results from the study that the upper side reservoir of shaxi N₁-N_2¹was mesoporous,mid-permeability types,and the footwall reservoir was low porosity and low permeability types.Distributary channel area is the main reservoir sand.The main subzones in this area is divided into 4 types.Based on the above studies the main factors which control the reservoir distribution is drawn.Controlling factors of oil and gas gathered on the upper side is tectonic faults,reservoir characteristics and Pore types.Controlling factors ofⅥ-Ⅷreservoir standard is construction,interlayer thickness and sedimentary characteristics.