贝克盆地卫星重力场特征与构造单元划分

中海油研究总院有限责任公司,北京 100028

地质资源与地质工程; 贝克盆地; 构造解析; 位场分离技术; 位场边缘识别技术; 布格重力异常; 布格重力异常总水平-垂向导数

Satellite gravity field and the division of tectonic units of the Biak Basin,Indonesia
ZHANG Ke,FANG Yong,CHEN Quan-hong,XI Zhu-gang,CHENG Yue-hong

(China National Offshore Oil Corporation Research Institute Co.,Ltd.,Beijing 100028,China)

geological resources and geological engineering; Biak Basin; structural analysis; field data separation technique; field data edge recognition technology; bouguer gravity anomaly; bouguer gravity anomaly NVDR_THDR

DOI: 10.13800/j.cnki.xakjdxxb.2018.0120

备注

贝克盆地位于印尼东部巴布亚省贝克岛海域,为一受Sorong断裂走滑作用形成的大型走滑拉分盆地。该盆地勘探程度极低、地表油气苗比较活跃,发育大型沉积坳陷,油气勘探潜力不容忽视。该盆地属于勘探前瞻区,井震资料较少,尚未开展系统的构造解析等石油地质规律方面研究。因此,综合利用地震资料和高精度卫星重力资料研究贝克盆地的构造区划,为进一步勘探研究奠定基础。研究中应用位场分离技术获取布格重力异常划分贝克盆地边界及二级构造单元6个; 利用位场边缘识别技术计算布格重力异常总水平-垂向导数推测贝克盆地控盆断裂3组,其中2组为近东西走向,一组为近南北走向。研究表明贝克盆地发育3组大型断裂体系,分为6个二级构造单元,整体呈“西高东低、三坳三隆、隆坳相间、东西分块”的构造格局。此次研究借助高精度卫星重力资料,以区域地质及地震资料为参考,有效解决了低勘探前瞻盆地构造区划的难题,指明了该区的研究方向,对类似靶区具有较好的借鉴和推广意义。

The Biak basin is located in offshore of the Biak islandin Papua Province,Eastern Indonesia,which is a big strike-slip pull-part basin in the Sorong strike-slip fault zone.The basin is at a very less exploration stage with active oil and gas seeps and large sedimentary depression.The basin is a frontier area for oil and gas exploration,with less well and seismic data,and the tectonic analysis has not been carried out.Therefore,we integrated the seismic and high accuracy satellite gravity data to study the tectonic division of the Biak basin to provide a foundation for further exploration.We have divided the boundary of the Biak basin with the field data separation technique by using the Bouguer gravity anomaly,and identified three large-scale depressions and three uplifts.With the field data edge recognition technology,we have identified three group large faults based on the normalized vertical derivative of the total horizontal derivative(NVDR_THDR).Research shows that the Biak basin developed three sets of large faults system,can be divided into six sub-tectonic units,the whole tectonic pattern is West high and East low,three Depressions and three Uplifts,uplift and depression segmented,and east and west blocked'.Based on the high accuracy satellite gravity data and regional geology and seismic data,we have solved the problem of structural division in the frontier basin effectively,and pointed out the research direction of the area,providing a good reference and promotion significance for similar target area.