基于成藏体系理论的碳酸盐岩含油气区带评价方法——以塔里木盆地寒武系为例

Petroleum accumulation system evaluation of carbonate oil and gas: a case study of Cambrian in Tarim Basin

周波 李慧莉 云金表 徐忠美 冯帆

ZHOU Bo LI Huili YUN Jinbiao XU Zhongmei FENG Fan

中国石化 石油勘探开发研究院, 北京 100083

Petroleum Exploration and Production Research Institute, SINOPEC, Beijing 100083, China

以成藏体系理论为基础，参考前人区带评价参数标准，针对塔里木盆地碳酸盐岩层系，分别从烃源体、圈闭体、输导体和体系的有效保存性出发，建立了碳酸盐岩地质评价参数标准体系。该区纵向上以一套具有类似地质背景的圈闭体为核心，和其相关联的烃源体和输导体共同组成一个完整的成藏体系。在参数体系中，提出了输导体的3个评价参数：输导层类型、供烃方式和运移距离的评价标准。利用统计学方法，考虑运移距离和成藏几率的关系，指出油气运移距离评价参数分为小于10 km、10~50 km、50~100 km和大于100 km。针对塔里木盆地寒武系膏盐岩下碳酸盐岩地层，采用同时考虑油气聚集单元和盆地构造单元的双要素子体系划分方法，以及考虑地质参数的不确定性开展评价。塔北隆起东侧盖层覆盖区和塔中隆起北侧为1类地区；顺托果勒低隆区、塔西南地区、塔中隆起南侧、巴楚隆起北侧、塔北隆起西侧为2类地区。

An evaluation of carbonate oil and gas was carried out based on the petroleum accumulation system theory of a superimposed basin. Considering the evaluation parameters of previous achievements, the hydrocarbon resource, plays, pathway systems and the preservation of the petroleum system were analyzed for carbonate beds in the Tarim Basin. A new evaluation standard was prepared. In this standard, the plays which go through the same tectonic evolution process, and the hydrocarbon resource and pathway system, which provide hydrocarbon for the play, comprise one petroleum accumulation system. In the evaluation of pathways, three parameters, type of migration pathway, hydrocarbon supply mode, and migration distance are chosen. The statistics of migration distance and reservoir numbers showed that migration distance can be divided into four sections, < 10 km, 10-50 km, 50-100 km, > 100 km. Oil and gas accumulation units and basin structural units were both used to divide the oil and gas area, and the uncertainty of geological parameters was also taken into account. The evaluation of the carbonate oil and gas in the Tarim Basin was carried out. The east of the Tabei uplift and the north of the Tazhong uplift belong to class 1, while the Shuntuoguole low uplift, Southwest Depression, south of Tazhong uplift, north of Bachu uplift, west of Tabei uplift belong to class 2.

国家科技重大专项项 2011ZX05005;中科院先导A项目 XDAXX010402

https://doi.org/10.11781/sysydz202001132