摘要
乐东气田乐东15-1构造是莺歌海盆地诸多泥底辟构造之一,该构造的第四系乐东组、新近系莺歌海组被泥底辟拱起后形成典型的穹隆背斜构造。在底辟上拱张应力的作用下,上覆地层中形成一系列放射状断裂,这些断裂对乐东15-1气田天然气的运移及封堵起到了关键控制作用,同时也严重影响着气田的开发效果。针对乐东气田地质、地震特征,利用小波变换相干分析技术进行断层识别及解释,实现了对可视断层空间展布的刻画及微断层断裂关系的描述;利用单频相位体对地层不连续敏感性所造成的规律性相位扭动和错断,来确定断层的延展长度;最后利用蚂蚁追踪技术的高分辨率特性,多体融合完成了对乐东15-1构造断层的精细、定量刻画。断层解释成果对该气田生产动态分析、储量计算、开发井位部署等起到了极为重要的指导作用,并以此建立起了一套适合底辟断层带有效识别及分析的地球物理技术系列。结论指出,采用高密度三维地震提高资料横向分辨率的方法应是未来油气勘探发展的方向。
The Ledong 15-1 Gas Field is situated in one of the numerous mud diapir structures of the Yinggehai Basin, in which the Quaternary Ledong Fm and Neogene Yinggehai Fm were arched into typical dome-shaped anticlines. Under the upward tensile stress of the diapir, a series of radial faults has been formed in the overlying strata, which is a key to gas migration and plugging in the Ledong 15 1 Gas Field, on the other hand, these faults significantly affect the development performance. According to the geological and seismic characteristics of this field, the wavelet transform coherence algorithm was adopted to identify and interpret the faults. On this basis, a combination of visual fault space distribution and micro-faults was obtained. Moreover, the sensibility of the single- frequency phase to the formation discontinuity would result in regular phase shifting and dislocation, which was used for determining the extended length of a fault. Finally, the high-resolution Ant-Tracking technoiogy was adopted, altogether completing a fine and quantitative presentation of the Ledong 15-1 fault structures. The interpretation for the faults in this area is of great importance in guiding the dynamic analysis of gas field production, reserve calculation, design of development well pattern, etc. In addition, a se- ries of geophysical technologies has been established for effectively identifying and analyzing the diapir fault zones. Based on the anal ysis, using the high-density 3D seismic method to improve the transverse resolution of the data will become a trend in future oil and gas exploration.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2013年第11期56-61,共6页
Natural Gas Industry
基金
国家科技重大专项课题(编号:2011ZX05023-004)
关键词
莺歌海盆地
乐东气田
泥底辟
穹隆背斜
微断层
小波变换相干
单频相位体
蚂蚁追踪
三维地震
Yinggehai Basin, Ledong Gas Field, mud diapir, dome-shaped anticline, micro-fault, wavelet transform coherence, single-frequency phase, Ant-Tracking, 3D seismic method
