地球物理学进展 ›› 2018, Vol. 33 ›› Issue (5): 2102-2107.doi: 10.6038/pg2018BB0538

• 应用地球物理学Ⅱ(海洋、工程、环境、仪器等) • 上一篇    下一篇

基于全局最优化的地震自动解释技术及其在缅甸若开海域深水区勘探中的应用

丁梁波1(),邵大力1,王海强2,曹光伟2,范国章1   

  1. 1. 中国石油天然气股份有限公司杭州地质研究院,杭州 310023
    2. 中油国际(凯尔)公司,仰光 11181,缅甸
  • 收稿日期:2017-12-27 修回日期:2018-08-20 出版日期:2018-10-20 发布日期:2019-01-11
  • 作者简介:丁梁波,男,1982年生,安徽宿松人,工程师,主要从事地震资料解释及油气勘探目标综合评价等工作.
  • 基金资助:
    中国石油天然气集团公司海外重点战略大区勘探技术研究与应用课题(2016D-4303)

Global approach for automated seismic interpretation and its application in deep water exploration of Myanmar Rakhine offshore

DING Liang-bo1(),SHAO Da-li1,WANG Hai-qiang2,CAO Guang-wei2,FAN Guo-zhang1   

  1. 1. Petrochina Hangzhou Research Institute of Petroleum Geology, Hangzhou 310023, China
    2. Chinnery Assets Limited, Yangon 11181, Myanmar
  • Received:2017-12-27 Revised:2018-08-20 Online:2018-10-20 Published:2019-01-11

摘要:

缅甸若开海域深水区第三系沉积厚度大,深水浊流沉积体系十分发育,但缺乏区域分布的不整合面,地震层位横向对比困难,传统三维地震层位解释需要耗费解释员非常多的时间和精力且依赖于解释员的经验.近年来,国际上许多研究机构致力于研究直接从地震数据计算地质模型的全局化地震自动解释算法,部分已在油气勘探生产中得到了应用.基于成本函数的全局最优化地震自动解释技术是其中的一种,它从三维地震数据出发,利用地震道之间的相关图像,建立地震道之间的连接,并用成本函数对连接进行优化,从而快速高效地建立三维地质模型,自动解释得到有等时地层意义的地震层位数据,基于自动解释层位提取的地震属性等时地层切片可以更精细地描述沉积体的横向变化.本文将这一全新的地震自动解释技术应用于缅甸若开海域深水区高精度三维地震数据上,快速高效地建立了三维区地震地层解释模型;基于自动解释的层位,得到了精度更高的地震属性体等时地层切片,识别了水道、天然堤、末端扇、决口扇和块体搬运等典型深水沉积结构单元,加深了沉积体系认识,指导了研究区的油气勘探.

关键词: 全局最优化, 地震自动解释, 等时地层切片, 成本函数, 缅甸, 深水

Abstract:

The deep water area of Rakhine basin, located to the west offshore Myanmar, is a part of the world largest submarine fan-Bengal Fan. Large scale deep water depositional system is developed since Eocene without regional unconformity which makes it very difficult to conduct seismic horizon interpretation for oil and gas exploration in this area. Conventional 3D seismic horizon picking is usually labor intensive and time consuming; the quality depends on experience of interpreter. Recently, a number of institutes have been engaged in developing global approaches to compute geological models directly from the seismic data without need to pick all horizons manually, some of which have been applied in oil and gas exploration. The global approach based on cost function is one of the best, which build links between seismic points using correlation images obtained from couples of seismic trace. The quality of the links is estimated by a cost function. Using this method, a 3D geological model could be computed from 3D seismic data. The computed horizons are thought to be isochronous interface and derived attributes would be more precise than traditional stratigraphic slices. This novel approach is applied on high quality 3D seismic data acquired in deep water area in Rakhine offshore, Myanmar. A high quality 3D geological model was computed very efficiently and stratigraphic slices of RMS amplitude and similarity were derived to characterize channels, channel-levee complexes, crevasse splays, frontal splays and MTDs in deep water sedimentary system, which increase the understanding of depositional system of Bengal Fan and is further helpful for oil and gas exploration in study area.

Key words: global approach, automated horizon picking, stratigraphic slice, cost function, Myanmar, deep water

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