渤海海域陡坡带地层划分技术与应用

发布时间：2018-02-04 23:34

本文关键词： 资源地层地层分析技术陡坡带古近系渤海　出处：《地层学杂志》2017年01期 　论文类型：期刊论文

【摘要】：随着油气勘探的不断深入,在渤海海域陡坡带古近系相继发现了一些大中型油气藏,但陡坡带的地层划分十分困难,其一是新老化石分子共存,一般认为出现新的化石组合意味着钻遇新的地层,但这种地层划分方法有时与周边地层矛盾,在地震上无法跟踪对比;二是边界断层下降盘巨砾岩年代归属问题,由于岩石碎屑粒径远远大于钻头直径,获取的岩屑见不到原始颗粒面,很难确定钻入的是否风化壳、基底本体。陡坡带地层分析技术是一门新兴的地层分析技术,包括3项技术即钻时岩屑复合技术、电测井岩屑复合技术和化石组合和保存状态复合技术,根据钻井取样中发现的化石保存状态及其组合关系、岩性和配置关系,结合钻时、岩屑录井及其测井响应,识别再沉积、巨砾岩、风化壳和底砾岩。解决地层归属问题有助于陡坡带构造演化和成藏研究,对现场施工也有重要意义,同时,也为凸起区地层缺失原因研究提供了新的思路和方法。
[Abstract]:With the development of oil and gas exploration, some large and medium oil and gas reservoirs have been discovered in the Paleogene of steep slope belt in Bohai Sea area, but the stratigraphic division of steep slope zone is very difficult, one is the coexistence of new and old fossil molecules. It is generally believed that the emergence of new fossil assemblages means that new strata may be drilled, but this method of stratigraphic division sometimes contradicts the surrounding strata and cannot be traced and correlated in earthquakes. The second is the age attribution of the giant conglomerate in the descending plate of the boundary fault. Because the diameter of the rock debris is far larger than the diameter of the bit, the obtained cuttings can not see the original grain surface, so it is difficult to determine whether the weathered crust is drilled in. Basement body. Steep slope zone stratigraphic analysis technology is a new stratigraphic analysis technology, including three technologies, I. e., cuttings composite technology, electric logging cuttings composite technology and fossil combination and preservation state composite technology. According to the fossil preservation state and its assemblage relationship, lithology and configuration relationship, and combined with the cuttings logging and its logging response, the redeposition and conglomerate can be identified. Weathering crust and bottom conglomerate. To solve the problem of stratigraphic attribution is helpful to the study of structural evolution and reservoir formation in steep slope zone, and is also of great significance to field construction. It also provides a new idea and method for the study of strata missing in uplift area.
【作者单位】：中海石油(中国)有限公司天津分公司渤海石油研究院;中海油能源发展股份有限公司工程技术分公司实验中心;
【基金】：“十二五国家科技重大专项”大型油气田及煤层气开发(编号:2011ZX05023-002)资助
【分类号】：P618.13;P736.22
【正文快照】： 1“十二五国家科技重大专项”大型油气田及煤层气开发(编号:2011ZX05023-002)资助。陡坡带作为一个新兴地质术语,目前尚无统一的分级,一般认为坡度大于15°,古地貌较为陡峭、处于边界断层下降盘的沉积区带(慕德梁等,2009)。渤海古近系皆为棋状断陷或者断陷盆地,边界断层角度一

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