江陵凹陷荆州背斜带典型构造解析

Typical tectonics axial surface of Jingzhou anticlinal belt in Jiangling sag

在江陵凹陷荆州背斜带的油气藏勘探过程中,由于地震资料品质有限,局部小构造落实难,构造活动复杂,构造样式多样,油气运聚规律缺乏系统研究,钻探成功率不高。基于构造几何学和构造应力学理论,分析江陵凹陷构造总体特征,对凹陷内的构造样式进行分区;基于三维地震资料,运用构造解析分析各个分区内构造样式的构造特征,提出其成因模式,并挑选了2种典型构造(盐构造和火山构造)进行精细解析,进一步验证构造特征与成因模式。综合利用各典型构造的研究成果以及典型构造与油气运聚在时间和空间上的配置关系,推导出荆州背斜带的构造成因、构造模式和构造样式与油气运聚的关系,得到盐构造和火山构造对油气聚集的影响取决于构造与原生油气藏在空间上的配置关系以及构造活动与油气运移的时间配置关系。因此,分析荆州背斜带内油气藏成藏时间和空间与盐构造、火山构造的组合关系是下一步勘探的重点方向。

I n the exploration process of oil and gas reservoirs of Jingzhou anticlinal belt in Jianglinwas difficult to determine small structures, and the tectonic activity was complicated, tectonic style was diversemigration and accumulation were not analysed systematically ,and the drilling success rate is not high. Based on the tectonic geometryand structure mechanics theory ？the overall characteristics Jiangling sag structure were analysed, tectonic styles in the sag were divided into several partitions;based on 3D seismic data,the structural characteristics of tectonic style in each partition was stuuied by using the structural analysis,and put forward the model of its causes,two typical structure were selected,salt tectonic fine resolution,whose purpose was to further verify the tectonic characteristics and genetic model. Combined with the restypical structure ,and configuration relations of typical structure and the oil and gas in time and space , the tectonic genesis, tectonicmode and the relationship between tectonic style and migration and accumulation of coal and influences of salt tectonic and volcanic structure on migration and accumulation of coal and gas dependtypical structure and the oil and gas in space , and the configuration relations of tectonic time. So,all this is the key direction of next exploration work.