第37卷第6期 2016年12月
文章编号：1001-3873(2016)06-0741-07
新疆石油地质
XINJIANG PETROLEUM GEOLOGY DOI:10.7657/XJPG20160620
Vol.37,No.6 Dec.2016
威利斯顿盆地和西墨西哥湾盆地致密油成藏差异
李倩"，卢双舫"，李文浩"，许思勇”，张啥"，胡莹！
（1.中国石油大学a非常规油气与新能源研究院；b.地球科学与技术学院，山东青岛266580；
2.中国石油集团测井有限公司长庆事业部，陕西高陵710201）
摘要：在分析油气勒探相关资料的基础上，结合薄片鉴定和有机地球化学资料，探讨了威利斯顿盆地巴肯组和西墨西哥湾盆地离准组泥页岩地质、地球化学特征，并剖析了巴青组和鹰滩组油气成藏差异的原因。巴育组和鹰滩组岩
石组合的不同导致二者油气成藏方式存在差异，巴肯烃产生的超压大于鹰滩组，具有
较少，而属滩组泥页岩生成的育，孔唤更大，为油
服
主，鹰滩组以源内成藏为主。巴组泥页岩生
外感装为：
，从而导致巴肯组泥页岩中滞留的油气中段物性优于上段和下段，面且连通孔隙更发
原都教发
有，这2类储集层都对烃类的储存有重
油蔗灼为连续型或准连续型油蔗，巴肯组致密油戴主要以纵向运移为主，
要的贡献。巴背组致密油戴和属滩组致
巴肯组中段致密储集层形成了大面积连续分市的致密油区，而鹰滩组致密油藏同时存在纵向运移和侧向运移，形成了纵向上泥页岩油藏和致密灰岩油藏互相叠置，具有源储一体、叠加连片的特点。
关键词：威利斯顿金地；巴肯组；西墨西哥湾盆地；鹰准组；致密油藏；成藏条件；岩石组合；超高压
中图分类号：TE122
文献标识码：A
HydrocarbonAccumulationDifferences of TightOil betweenWillistonBasin
andWesternGulf of MexicoBasin
LI Qian',LU Shuangfang",LI Wenhao",XU Siyong,ZHANG Han',HU Ying
(1.China University of Petroleum a.Research Institute of Unconventional Hydrocarbon and Renewable Energy; b.School of Geosciences,
Qingdao,Shangdong 266580, China; 2.Changqing Division,CNPC Logging, Gaoling,Shanxi710201,China
Abstract: Based on the analysis of petroleum exploration data combined with thin-section identification and organic geochemical data, the paper studies the geological and geochemical features of shales of Bakken formation in Williston basin and Eagle Ford formation in West-em Gulf of Mexico basin, and analyzes the reason causing hydrocarbon accumulation differences between the two formations. Different rock associations result in the differences of hydrocarbon accumulation patterms between Bakken formation and Eagle Ford formation - the for-mer is dominated by outer-source accumulation and the latter by inner-source accumulation. The overpressure caused by hydrocarbon-gen-eration in shales of Bakken formation is larger than that of Eagle Ford formation, which allows greater hydrocarbon expulsion forces and is helpful for oil and gas expulsion from the shales. Therefore, less oil and gas retain in shales of Bakken formation than that of Eagle Ford for-mation (with most oil and gas retaining in shales). The physical properties of middle Bakken formation are better than those of the upper and lower Bakken formations due to more developed connecting pores and larger pore throats,andthe middle Bakkenformation is the main interval for oil and gas occurrence, Shales and limestones in Eagle Ford formation with well developed pores contribute significantly to hy-drocarbon storage. Tight oil reservoins in both Bakken and Eagle Ford formations are continuous or quasi-continuous reservoirs. The tight oil reservoirs in Bakken formation mainly migrate vertically, leading to the formation of continuous large-area tight oil regions in the middle Bakken reservoir. Whereas, vertical and lateral migrations occur in Eagle Ford tight reservoirs, resulting in the overlapping of shales and tight limestones vertically, which could act as the source rock and reservoir simultaneously featured by interconnection and superimposition. Keywords: Williston basin; Bakken formation; Westerm Gulf of Mexico basin; Eagle Ford formation; tight oil reservoir, accumulation
condition; rock association; overpressure
常规油气资源的逐渐枯竭和经济发展对能源需求的不断攀升，迫使石油勘探家不得不探索油气勘探的新领域，北美的勘探开发实践揭示，非常规油气在能源结构中的地位越来越重要，其中，致密油是非常规油气资源中最为现实的接替领域"-"。
收稿日期：2016-03-24
修订日期：2016-06-12
致密油是一种非常规油气资源，主要以吸附或游离状态赋存于烃源岩中，或与烃源岩互层、紧邻致密砂岩、致密碳酸盐岩等储集岩中，是未经过大规模长距离运移的石油聚集，主要包括致密砂（灰）岩油和页岩油2大类，其中致密砂(灰)岩油是泥页岩排出油
基金项目：国家自然科学基金（41402122)；博士后科学基金(2014M561980）
作者简介：李倩（1991-)，女，山东烟台人，硕士研究生，矿产普查与勘探专业，Tel)18765922885(Email)865442799@qq-com 万方数据