复杂深水重力构造勘探研究新方法——以尼日尔三角洲深水区A构造为例

针对用常规解释方法和相干体技术对尼日尔三角洲复杂深水重力构造进行断层解释失效的状况,提出了复杂深水重力构造勘探研究新方法,即层位解释—断层解释—断层剖面地质模式确定—断层平面特征分析的综合研究思路。创新性地应用沿层平均瞬时相位技术代替常规相干分析技术进行断层平面组合,提高了断层解释的精度和效率,解释结果更加符合重力构造形成的地质规律。在此基础上,建立了复杂深水重力构造"树状"断裂体系模式,并提出了"爬树法"的分析模式,对"树状"断裂体系进行级别和期次划分,并确定了断层对油气输导和分割的双重作用,为今后复杂深水重力构造的勘探开发奠定了基础。

A new method to research complex gravity structures in deep water:a case of structure A in deep-water Niger Delta

For the complex gravity structures in deep-water Niger Delta,the conventional methods and the coherence technique can not work effectively in fault interpretation,and a new idea for researching such gravity structures is developped,i.e.from horizon interpretation,fault interpretation,establishing geological section models of fault to analyzing areal features of faults.Instead of the coherence technique,the technique of average instantaneous phase along seismic horizons is creatively used to conduct areal assembling of faults,resulting in higher precision and efficiency in interpreting faults and interpretations more fitting to the geological pattern of gravity structure.Based on these researches,a "tree-shape"model of fault system is built,and an analysis model of "climbing-tree method" is developped,by which a "tree-shape" fault system can be divided into various orders and periods,and it is determined that the faults may perform double functions for hydrocarbon,i.e.migration pathway and flow barrier.All these may become foundations for the future exploration and development of such complex structures.