基于ArcGIS空间图形插值法的致密气资源评价——以俄罗斯蒂曼—伯朝拉盆地为例

Tight Gas Resource Evaluation Based on ArcGIS Spatial Graph Interpolation Method——A Case Study of Timan-Pechora Basin in Russia

致密气呈大面积连续聚集分布、储层非均质性强、资源丰度差异较大,传统的体积法资源评价无法表征关键参数和资源的非均质性、资源丰度平面分布差异性。基于全球非常规油气勘探开发基础数据和商业数据库、ArcGIS软件数据管理与空间叠加分析功能,建立了ArcGIS空间图形插值法及其评价致密气资源的七步操作技术流程。该流程具体包括:将评价区关键图形和数据参数转换为ArcGIS空间矢量数据,根据地质属性相似性划定评价区和评价单元,在区域上进行网格化,优选普通克里金插值法,以网格为单元对每个参数进行空间插值运算和赋值,将关键参数网格图进行空间叠加、网格资源量计算与积分求和,最终得出评价区的总地质资源量、总可采资源量及其丰度和相关图件。将该方法应用于俄罗斯蒂曼—伯朝拉盆地资源评价,结果表明:二叠系致密气总可采资源潜力为3400×10^(8)m^(3);“甜点区”主要分布于评价区北部、南部和东部的隆起带和山前坳陷带;北部—东部山前坳陷带成藏组合有利,地台区二叠系埋深较浅,北极的海域部分勘探程度最低,预测最有潜力,是开辟北极资源战略基地的重要据点。

Tight gas exhibits a large area of continuous accumulation distribution,strong reservoir heterogeneity,and significant differences in resource abundance.Traditional volumetric resource evaluation cannot characterize key parameters and resource heterogeneity,as well as differences in resource abundance plane distribution.Based on the basic exploration and development data of global unconventional oil and gas of PetroChina,the global commercial database of oil and gas basins,and the data management and spatial overlay analysis functions provided by ArcGIS software,ArcGIS spatial graph interpolation method(ArcGIS SGIM)and its seven-step technical process for evaluating tight gas resources were established.The process converts the key graphics and data parameters of the evaluation area into ArcGIS spatial vector data,delineate the evaluation area and evaluation units based on the similarity of geological attributes,and grid on the area.The common Kriging interpolation method is preferred to carry out spatial interpolation and assignment on each parameter using the grid as a unit,stack the key parameter grid map in space,calculate and integrate the grid resources.Finally,the geological resource amount,recoverable resource amount,abundance and map of the whole evaluation area are obtained.This method is applied to evaluate the tight gas resource of Timan-Pechora Basin in Russia.The results show that the total recoverable resource potential of Permian is 3400×10^(8)m^(3).The“sweet-spot areas”are mainly distributed in the uplift zone and piedmont depression zone in the north,south and east of the evaluation area.The northern and eastern piedmont depression zones have favorable reservoir formation combinations,shallow burial depth of Permian in the platform area,and the lowest exploration degree in some parts of Arctic sea.It is predicted to have the most potential and is an important stronghold for opening a strategic base for Arctic resources.