以成藏组合为核心的油气资源评价方法及应用:以巴西坎波斯(Campos)盆地为例

Method of Play Cored Oil and Gas Resource Assessment and Application:Taking Campos Basin in Brazil as An Example

系统论述了以含油气储集层为核心划分盆地成藏组合,并以成藏组合为基本评价单元的资源评价方法。在综合分析盆地构造、沉积、地层演化特征,储集层岩性和岩相特征,区域盖层发育,油气富集程度等因素的基础上,在纵向上和平面上对盆地的成藏组合进行了划分。通过统计不同的成藏组合内已发现油气藏的数量及规模,确定资源评价的计算方法和计算参数,最终获得符合目前盆地勘探现状及石油地质认识的资源量计算结果。以巴西坎波斯盆地为例,将该盆地划分出4个成藏组合,分别是:上部上白垩统-中新统Carapebus浊积砂岩储层成藏组合、中部下白垩统Macae碳酸盐岩储层成藏组合、下部下白垩统Lagoa Feia鲕粒灰岩储层成藏组合和底部下白垩统Cabiunas裂缝火山岩储层成藏组合,并分别计算了每一个成藏组合的预测待发现可采资源量,综合分析认为上部上白垩统-中新统Carapebus浊积砂岩储层成藏组合最为有利。

The paper discusses a play division method which focuses on hydrocarbon bearing reservoir and takes a resource assessment method as a new basic assessment unit.The basin play has been divided in panel and vertical after comprehensive analysis of basin structur,sedimentary,strata evolution,reservoir lithology and lithological facies,regional seal distribution and hydrocarbon distribution.Then the number and size of discovered reservoir should be counted based on the resource assessment method and parameters.The final resource results that fit the exploration situation and petroleum exploration could be calculated.Taking Campos basin as an example,the basin is divided into four plays,which are upper,middle,lower and bottom plays.The forecasting resource of each play is calculated.After comprehensive analysis,the Tertiary and Cretaceous turbidite sandstone in upper play is the most favorable exploration zone.