准噶尔盆地玛湖凹陷及周缘佳木河组划分对比新认识与天然气勘探方向

doi:10.3969/j.issn.1672-7703.2021.04.008

摘要/Abstract

摘要： 准噶尔盆地玛湖凹陷及周缘佳木河组是一套重要的天然气勘探层系，佳木河组划分对比研究对天然气勘探选区选带具有指导作用。前人研究中，佳木河组在露头、钻井、地震对比不清、天然气接续勘探方向不明。因此，应用多种地层研究方法，综合对比佳木河组露头、井下、地震特征，并结合天然气地球化学特征分析，进而探讨佳木河组划分对比方案及天然气勘探方向。结果表明：佳木河组为“下碎屑岩、上火山岩”岩性组合，时代归属早二叠世，厚度由玛北向中拐方向减薄；玛南—中拐地区原划为佳木河组的部分井段被剔除该层、属于上石炭统；玛北地区佳木河组具有供气能力，玛北地区深部是天然气勘探有利方向，佳木河组—石炭系“自生自储”“新生古储”的构造—岩性圈闭具备较好潜力。

关键词: 佳木河组, 地层划分对比, 天然气勘探, 玛湖凹陷, 准噶尔盆地

Abstract: Jiamuhe Formation is one of the major targets for natural gas exploration in Mahu Sag and its periphery in Junggar Basin. Therefore, the study of stratigraphic division and correlation of Jiamuhe Formation is of guiding signifi cance to the selection of exploration zones and plays in this area. However, the correlation method in previous studies is unclear and the replacement area for natural gas exploration is not known. In this paper, multiple stratigraphic study methods are used to synthetically correlate the characteristics of outcrop, downhole and seismic data, and natural gas geochemical data are combined, so as to determine the stratigraphic division and correlation scheme of Jiamuhe Formation and natural gas exploration target. The study result shows that the Jiamuhe Formation is developed in the Early Permian, with lithology association of “clastic rocks in the lower part and volcanic rocks in the upper part”. The stratum is thinner from northern Mahu Sag towards Zhongguai area; In Manan-Zhongguai area, part of the well section which was regarded as Jiamuhe Formation is classifi ed into the Upper Carboniferous; Jiamuhe Formation in northern Mahu Sag has natural gas generation capability, where the deep-seated reservoir is favorable target for natural gas exploration. The structural-lithologic traps in Jiamuhe Formation-Carboniferous have promising potential of “self-generation and self-storage” and “upper-generation and lower storage” types natural gas reservoirs.

中图分类号:

TE122

王韬, 郑孟林, 任海姣, 李婷, 吴海生, 王绪龙, 张越迁, 常秋生, 李永军, 王霞田. 准噶尔盆地玛湖凹陷及周缘佳木河组划分对比新认识与天然气勘探方向[J]. 中国石油勘探, 2021, 26(4): 99-112.

Wang Tao, Zheng Menglin, Ren Haijiao, Li Ting, Wu Haisheng, Wang Xulong, Zhang Yueqian, Chang Qiusheng, Li Yongjun, Wang Xiatian. New understandings of stratigraphic division and correlation of Jiamuhe Formation and natural gas exploration target in Mahu Sag and its periphery, Junggar Basin[J]. China Petroleum Exploration, 2021, 26(4): 99-112.

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