塔里木盆地阿—满过渡带中—上奥陶统海相烃源岩的识别及其意义

英文篇名：Identification and significance of the Middle-Upper Ordovician marine source rocks in transitional zone between Awati and Manjia'er depressions,Tarim Basin
中文刊名：天然气工业
英文刊名：Natural Gas Industry
作者：高志勇 ; 李建军 ; 张宝民 ; 顾乔元 ; 卢玉红
英文作者：Gao Zhiyong1 ; 2 ; Li Jianjun3 ; Zhang Baomin1 ; 2 ; Gu Qiaoyuan3 ; Lu Yuhong3(1.Laboratory Center of Petroleum Exploration and Development Research Institute ; PetroChina ; Beijing 100083 ; China ; 2.State Key Laboratory of Enhanced Oil Recovery // Petroleum Exploration and Development Research Institute ; PetroChina ; Beijing 100083 ; China ; 3.Petroleum Exploration and Development Research Institute ; Tarim Oilfield Company ; PetroChina ; Kurle ; Xinjiang 841000 ; China)
中文关键词：塔里木盆地 ; 阿—满过渡带 ; 中奥陶世—晚奥陶世 ; 海相烃源岩 ; 有机质丰度 ; 空间展布 ; 台地内凹陷沉积相变
英文关键词：transitional zone between Awati and Manjia'er depression ; Middle-Upper Ordovician ; marine source rocks ; organic abundance ; spatial distribution ; intra-platform depression ; sedimentary facies change ; Tarim Basin
出版日期：2012-05-22
机构：中国石油勘探开发研究院实验研究中心;中国石油勘探开发研究院提高石油采收率国家重点实验室;中国石油塔里木油田公司勘探开发研究院;
年：2012
期：05
出版单位：天然气工业

摘要

塔里木盆地阿瓦提凹陷—满加尔凹陷过渡区域(简称阿—满过渡带)多年来一直未发现奥陶系烃源岩,但大量的地球化学资料分析结果却将塔中与塔北地区的油气源区指向了该地区。针对这一现象,对该区构造高部位多口钻井中的中—上奥陶统泥岩样品进行了有机碳含量复查与分析,初步在塔中29井识别出一套海相烃源岩,其有机质丰度(TOC值)可达1.30%,所在地层厚度约为95.0m。在此基础上,进行了烃源岩井震对比及烃源岩发育层位在地震剖面上的对比追踪,最终在阿—满过渡带识别出一套附存于中奥陶统一间房组顶部—上奥陶统吐木休克组的海相烃源岩。该套烃源岩向东相变于古城—轮古东台缘西侧,向南超覆尖灭于塔中Ⅰ号断裂带下盘的满加1井附近,向西超覆尖灭于阿—满过渡带西台缘,向北沉积相变于塔北隆起区羊屋2井南部,烃源岩最大埋深达8 500m。分析认为,该套烃源岩发育于阿—满过渡带碳酸盐岩台地内凹陷环境,其厚度小于150m,应该是塔中与塔北油气区的主力烃源岩之一。
No Ordovician marine source rocks have been found in the transitional zone between Awati and Manjia'er depressions,Tarim Basin.However,a large amount of geochemical data indicates that the oil/gas in the middle and northern Tarim Basin(hereafter referred to as Tazhong and Tabei) are possibly sourced from this area.In view of this,we reviewed and analyzed the TOC contents of the Middle-Upper Ordovician mudstone samples from several wells on the structural high in this area.A set of marine hydrocarbon source rocks with the TOC content up to 1.30% was preliminarily recognized in an interval with a bulk thickness of 95.0 m.On this basis,we performed well-seismic data correlation of the source rocks and tracing of the horizon with source rocks on seismic section.A set of marine source rocks was finally identified in the interval from the top Middle Ordovician Yijianfang Formation to the Upper Ordovician Tumuxiuk Formation in the transitional zone between Awati and Manjia'er depressions.This set of source rocks pinches out eastwards on the western side of the eastern margin of the Gucheng-Lungudong platform,overlaps and pinches out southwards near the Manjia-1 well in the footwall of Tazhong Ⅰfault,overlaps and pinches out on the western platform margin in the transitional zone,and pinches out northwards in the southern part of the Yangwu-2 well on the Tabei uplift.It has a maximum burial depth of up to 8500 m and a thickness of less than 150 m which was possibly deposited in an intra-platform depression within the transitional zone.It may be one of the major source rocks contributing hydrocarbons to the Tazhong and Tabei oil fields.This study is of great significance to hydrocarbon resource assessment and exploration potential evaluation.

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