斜坡带曲流河道砂体成藏模式及描述方法——以老河口油田为例

Meander channel sandstone reservoir pattern on slope belt and its description method:taking Laohekou oilfield for example

馆陶组河流相薄砂体油藏在胜利探区广泛存在。在济阳拗陷的滨浅海地区 ,发现了孤东、孤岛、埕岛三个亿吨级大油田 ,均为胜利探区典型的浅层油气富集单元。大型披覆构造带是馆陶组成藏的主要场所 ,这一认识在过去的勘探中一直起主导作用。然而 ,随着勘探的发展 ,在构造的斜坡带甚至洼陷中也找到了馆陶组的岩性油藏 ,如老河口和飞雁滩两个油田的发现 ,为馆陶组油藏的勘探开辟了新领域。通过对老河口油田的勘探开发实例分析 ,对浅层油气运移成藏方式有了新认识 ,建立起缺少大型油源断层条件下的斜坡带河道砂体的成藏模式 ,从而大大拓展了河道砂油藏的勘探领域 ;同时探索出一套建立在三维可视化基础上的河道砂体识别及描述方法 ;并对河道砂体的含油性预测方法进行了有益的探索 ,提高了勘探成功率。

The thin sand reservoir of fluvial facies in Guantao formation is wide spread in Shengli exploration area.Three large oilfields having hundreds million tons reserve:Gudong,Gudau and Chengdao oilfield have been discovered in the offshore area of Jiyang Depression,which are typical shallow oil rich accumulation units in Shengli exploration area.The practice of exploration shows a large drape structural belt is main oil accumulation area in Guantao formation,which guided exploration in the past.However,lithologic reservoirs in Guantao formation have been found on slope belt and recession of structure,such as Laohekou and Feiyantan oilfields along with development of exploration,which opened a new field for exploration of reservoir in Guantao Formation.Through analysis of exploration and development cases in Laohekou oilfield,there is new knowledge of shallow oil and gas migration and accumulation,building up channel sandstone reservoir pattern on slope belt in a condition of that big oil source fault is absent,so that the exploration field of channel sandstone reservoir has been greatly enlarged;meanwhile,a set of recognition methods of channel sand body and its description method based on 3 D visualization has been explored and a useful study of method for oil bearing prediction in channel sand body bas been carried out,improving successful rate of exploration.sorption co