Evaluation Of Cambrian-Ordovician Oil And Gas Resources In Aksu Region, Tarim Basin

Aksu is the region with the most concentrated marine oil and gas distribution and the most production in the Tarim Basin,and it is also a test field for oil and gas reform in Xinjiang.Although the Tarim Basin has experienced multiple oil and gas resource evaluations,and the breadth and depth of the resource evaluation have gradually increased,there has been no systematic evaluation of Aksu marine oil and gas.After continuous investment in researchers,funds and materials in the region,marine oil and gas exploration results have been remarkable,and Cambrian-Ordovician oil and gas has become a new research hotspot and exploration focus.Based on the previous basic petroleum geological research such as the geographical background,structure and fault development,sedimentary environment and layer formation mechanism of the Aksu region,combined with the latest data and progress,and studying the oil and gas distribution and exploration potential of the Aksu Cambrian-Ordovician.This time,according to the current status of marine oil and gas resources in each block of the exploration area,exploration degree and other factors,a variety of evaluation methods were selected according to local conditions to conduct a comprehensive analysis of the resources in the research area.Analyze the accumulation mechanism of key oil and gas fields,investigate the division schemes of the scale zones of CNPC and Sinopec,combine the needs of analogy evaluation units,and use this as a reference to select scale zones;dissect the typical scale zones,use statistical methods to estimate the scale zone resources,and calculate the migration and accumulation Coefficients,resource abundance and other analog key parameters,after dividing the analog evaluation unit,use the "similar analogy" geological thought to calculate the resources of the study area;collect the source rock geochemical parameters and some control parameters,analyze the Cambrian-Ordovician source rock resource scale and hydrocarbon generation and expulsion potential in each blockby using organic carbon method,and the SGRE software is used to calculate the hydrocarbon generation resource,the migration and accumulation units of each oil-bearing layer system are divided,and the geological resource amount is calculated in combination with the expulsion coefficient.Organize the resource data calculated by different evaluation methods in each block,and supplement the resource data of the CNPC Kuche Depression,and use the Delphi method to calculate the final resource of the target horizon: geological analogy obtained Cambrian-Ordovician crude oil in the Aksu area is 4.329 billion Tons,natural gas is 2.74 trillion cubic meters;organic carbon method calculates the resources: 5.23 billion tons of oil resources,natural gas geological resources is 2.43 trillion cubic meters;the final calculation of the oil resources in the study area is 4.69 billion tons,and the natural gas resources is 2.5 trillion cubic meters.