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四川盆地志留系小河坝组海相碎屑岩勘探方向及潜力
Exploration prospect and potential: Marine clastic rocks of Silurian Xiaoheba Formation, Sichuan Basin
邱玉超 罗 冰 夏茂龙 李亚丁 黄 力 叶 茂
点击:1044次 下载:57次
DOI:10.12055/gaskk.issn.1673-3177.2019.01.001
作者单位:中国石油西南油气田分公司勘探开发研究院
中文关键字:四川盆地 海相碎屑岩 志留系 小河坝组 三角洲 前积结构
英文关键字:Sichuan Basin; Marine clastic rock; Silurian; Xiaoheba Formation; Deltaic front; Progradation structure; Large wedgeshaped structure
中文摘要:四川盆地已在陆相碎屑岩和海相碳酸盐岩获得油气勘探发现,而海相碎屑岩还未获得突破,制约的关键因素是已有钻井未揭示良好的砂岩储层。基于露头、钻井和地震资料,从盆缘到盆内开展系统沉积演化特征的研究,刻画四川盆地志留系下统小河坝组三角洲展布,对比塔里木盆地东和砂岩地震相特征,预测小河坝组砂岩储层发育情况,分析四川盆地志留系小河坝组海相碎屑岩成藏条件和勘探潜力。研究揭示:①四川盆地志留系小河坝组沉积了浪控三角洲,发现了4 个具大型前积结构、大型楔状构造的三角洲前缘砂体,面积4 550 km2,为海相碎屑岩储层有利发育区。②川东地区志留系小河坝组具备有利成藏条件,下伏为龙马溪组优质烃源岩,上覆为韩家店组的广覆式厚层的泥岩盖层,形成良好的生储盖组合。川东地区小河坝组三角洲河口坝砂体与下伏龙马溪组厚层烃源岩发育区叠置,具备形成构造—岩性、岩性气藏条件;③志留系小河坝组海相碎屑岩有望成为四川盆地一个崭新勘探领域,可先寻找前积砂体与逆断层控制的断鼻构造配置的构造岩性圈闭;获得突破后,进一步探索斜坡区的单砂体岩性圈闭。
英文摘要:In Sichuan Basin, there is abundant oil and gas discovered from terrestrial clastic rocks and marine carbonate rocks, but no breakthrough has been made in marine clastic rocks. The key bottleneck is no clastic reservoirs revealed from existing wells. So, the characteristics of sedimentary evolution from basin edge to basin were studied systematically based on outcrop, drilling, and seismic data. Then, the deltaic distribution of Lower Silurian Xiaoheba Formation in Sichuan Basin was described, and the development of Xiaoheba sandstone reservoirs was analyzed by comparing with seismic-facies characteristics of Upper Devonian-Lower Carboniferous Donghetang sandstone reservoirs in Tarim Basin. Finally, both hydrocarbon accumulation and exploration potential of marine clastic rocks of Lower Silurian Xiaoheba Formation were analyzed. Results show that, ① a wave-dominated delta is deposited in Xiaoheba Formation. Four deltaic front sandbodies with large progradation and wedge-shaped structures, with 4 550 km2 in area, have been found in eastern basin. And they should be a favorable development zone of marine clastic reservoirs; ② the Lower Silurian Xiaoheba Formation in southeastern basin has favorable conditions for hydrocarbon accumulation, and it forms a better source-reservoir-caprock assemblage together with the underlying high-quality source rock of Longmaxi Formation and the overlying massive mudstone caprock of Hanjiadian Formation. In eastern basin, the deltaic mouth bar sandbody of Xiaoheba Formation overlaps with its underlying thick source-rock development zone of Longmaxi Formation, providing conditions for forming structural-lithologic and lithologic gas reservoirs; and ③ there are two types of favorable zones in Xiaoheba Formation. One is the favorable exploration zone of structural- lithologic gas reservoirs composed of deltaic front sandbody and structural trap, and another is that of lithologic gas reservoirs which was formed when single progradation sandbody was separated by mudstone between sandbodies.
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国内统一连续出版物号:CN51-1159/TE |国内发行代码: |国际标准出版物号:ISSN1673-3177 |国际发行代码:
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