准噶尔盆地玛湖凹陷风城组页岩油藏地质特征与成藏控制因素

doi:10.3969/j.issn.1672-7703.2019.05.008

摘要/Abstract

摘要： 准噶尔盆地玛湖凹陷风城组是中国陆相页岩油勘探的重要接替领域。为了给下步勘探部署提供依据，也为中国陆相页岩油成藏理论提供新积累，综合利用地震、测井、录井、试油、岩心、烃源岩热解、铸体薄片等分析测试的结果，对风城组页岩油地质特征进行研究，讨论了成藏机制。研究结果表明，玛湖凹陷风城组主要为一套沉积于碱湖环境，受机械、化学、生物、火山等沉积作用形成的混积岩, 自下而上划分为3 个岩性段，烃源岩全层段发育，富含藻类有机质，烃源岩最发育层段也是甜点发育层段，甜点层与烃源岩层呈互层或属于同层。风一段、风三段发育粉砂岩类和云质岩类甜点，风二段发育云质岩类甜点，甜点夹于烃源岩和碱性矿物层中。富有机质烃源岩、沉积微相、岩性、构造裂缝等控制着页岩油聚集与分布。

关键词: 页岩油, 地质特征, 控制因素, 风城组, 玛湖凹陷, 准噶尔盆地

Abstract: The Fengcheng Formation in Mahu sag in the Junggar Basin is important for successive exploration of continental shale oil in China. In order to provide basic data for future exploration and deployment, and enrich continental shale oil accumulation theory, the geological characteristics and accumulation mechanism of the shale oil in the Fengcheng Formation were studied through comprehensive analysis of seismic, well logging, mud logging and well test data, core, source rock pyrolysis, and casting thin sections. The results show that the Fengcheng Formation is composed of mixed rocks depositing in an alkaline lake environment under the sedimentary control of mechanical, chemical, biological and volcanic activities. The Formation is divided into three lithologic members from the bottom to the top. Source rocks with algal organic matters can be found in the whole Formation. The most developed source rock interval is the developed sweet spot interval. The sweet spot interval and the source rock interval are interbedded or in the same interval. The Feng 1 and Feng 2 Members have sweet spots of silty sandstone and dolomite, and the Feng 2 Member has sweet spots of dolomite. The sweet spots are distributed in source rocks and alkaline mineral layers. Organic-rich source rocks, sedimentary microfacies, lithology and structural fractures control the accumulation and distribution of the shale oil.

中图分类号:

支东明, 唐勇, 郑孟林, 徐洋, 曹剑, 丁靖, 赵长永. 准噶尔盆地玛湖凹陷风城组页岩油藏地质特征与成藏控制因素[J]. 中国石油勘探, 2019, 24(5): 615-623.

Zhi Dongming, Tang Yong, Zheng Menglin, Xu Yang, Cao Jian, Ding Jing, Zhao Changyong. Geological characteristics and accumulation controlling factors of shale reservoirs in Fengcheng Formation, Mahu sag, Junggar Basin[J]. China Petroleum Exploration, 2019, 24(5): 615-623.

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