龙湾筒凹陷构造特征及演化

Structural Feature and Evolution of Longwantong Depression

为了满足油气勘探的需要,利用三维地震资料对龙湾筒凹陷进行了详细的构造研究。龙湾筒凹陷的断裂主要为近南北、北北东和北西三个方向,近南北和北北东向断层为洼陷的主控断层,北西向断层对构造起复杂化和分割作用。将龙湾筒凹陷三维区划分为七个次级构造单元,并对各个单元进行了简单的论述。选取典型地震剖面进行了构造演化史分析,将龙湾筒凹陷的构造演化划分为断陷期、反转期和坳陷期三个演化阶段,并对断陷期的演化进行了重点分析,为龙湾筒凹陷的有利区带优选和资源评价提供了基础资料。

Using the three dimensions seism survey,the structure of Longwantong depression was researched in detail to meet the need of hydrocarbon exploration. The faults of Longwantong depression developed three groups of faults,adjacent NS and NNE and NE. The adjacent NS and NNE faults were the main controlling faults of the depression,and the NW faults perplexed and divided the structure. The three dimensions work area of Longwantong depression was divided into seven secondary structure units which were expounded roughly. The typical profiles were selected to research structural evolution which was divided into three evolution steps,namely fault period,reverse period and depression period. The fault period was analysed with emphasis to offer basal information for sector optimization and resource evaluation of Longwantong depression.