丛式平台控制圈闭群勘探评价方法——以厄瓜多尔奥连特盆地X区块为例

Evaluation for cluster platform controlling traps exploration: Taking the X block in Oriente Basin, Ecuador as an example

针对南美前陆盆地斜坡带圈闭规模小、数量多、资源国环保要求高等特点,提出一种以钻井平台控制圈闭为评价单元的斜坡带圈闭勘探评价新方法,并在奥连特盆地进行了现场应用。评价方法流程是:1圈闭地质风险分析,包括生、储、盖、圈、运、保等油气成藏关键要素分析,获得圈闭成藏概率;2风险评估后圈闭资源量计算,采用体积法计算圈闭资源量,圈闭资源量与圈闭成藏概率相乘得到风险评估后圈闭资源量;3钻井平台及钻探目标优选:以钻井平台控制范围为单元,统计不同平台控制范围内总圈闭风险评估后资源量、平均圈闭风险评估后资源量,根据数值大小对钻井平台进行优选排序;根据风险评估后圈闭资源量大小对优选出的钻井平台控制的圈闭进行钻探排序。运用该方法对奥连特盆地X区块M1层未钻圈闭进行优选排序,提出钻探平台建设和圈闭钻探顺序,实践表明效果良好。

Aimed at the small size, large quantity of traps and high environmental requirements of resource countries on slope belt of South America foreland basins, a new evaluation method is proposed for trap exploration on slope by taking the area controlled by a cluster platform as one evaluation unit. The evaluation process is： （1） trap geological risk analysis： including key oil ＆ gas accumulation element analysis such as source, reservoir, seal, trap, migration and preservation; （2） trap resources calculation： including trap resources calculated with volumetric method, trap accumulation probability evaluation by geological risk analysis, and finally the risk trap resources by multiplying the above two values; （3） platform and drilling target selection： count the total risk trap resources and average risk trap resource of different platform and rank the drilling platforms according to the calculated resources; and rank the trap drilling sequence according to the risk trap resources. The method was used in ranking undrilled traps in the M1 layer of Block X, Oriente Basin, and the platform construction and trap drilling order was recommended accordingly which shows good results in practice.