井-震结合进行高分辨率层序地层划分——以南苏门答腊盆地N油田U组为例

High-resolution sequence stratigraphic division by integration of well and seismic:taking U formation of N oil field in South Sumatra Basin for example

赵毅 唐艳萍 张铭 张文起

ZHAO Yi TANG Yanping ZHANG Ming ZHANG Wenqi

长安大学地质工程与测绘学院, 陕西西安 710054; 中国石油勘探开发研究院, 北京 100083

College of Geology Engineering and Geomatics, Chang'an University, Xi'an Shanxi 710054, China; Petro China Research Institute of Petroleum Exploration & Development, Beijing 100083, China

N油田U组上段地层发育粉砂岩和钙质泥页岩的三角洲前缘-浅海过渡相,多变的沉积相加大了小层对比的难度。针对此特点,结合层序地层学理论以及地震地层学的理论与研究方法,进行井-震结合对比划分地层,利用地震资料和标准层控制,构建大套地层等时格架;然后运用地震反射轴的等时性结合沉积旋回在地层格架内对比小层,确定研究区80口井6个分界界面。建立了区域高分辨率层序地层格架,形成了可容纳空间控制下的高级次层序格架建立的技术方法。

The upper U formation in N oil field develops delta front-shallow transition phase with siltstone and calcareous shale. The changeable sedimentary facies increased the difficulty of layer correlation. According to these features, combined with sequence stratig-raphy and seismic stratigraphy, integration of well and seismic was used to divide layers, under the control of seismic data and key bed, the formation isochronous framework was built. Then with the seismic reflection isochronism and the sedimentation cycle layers were divided in formation, 6 boundary interfaces of 80 wells was determined in research area. In the end, regional high-resolution se-quence stratigraphic framework was established, and senior stratigraphic framework technology in the accommodation space was formed.

https://doi.org/10.3969/j.issn.1008-2336.2011.04.024