川西北深层中二叠统茅口组岩相古地理及勘探意义
李雯 , 杨帅 , 陈安清 , 张玺华 , 陈聪 , 徐胜林 , 孙诗 , 罗健 , 陈洪德
地球科学 ›› 2023, Vol. 48 ›› Issue (02) : 609 -620.
川西北深层中二叠统茅口组岩相古地理及勘探意义
The Lithofacies Paleogeographic of the Middle Permian Deep Maokou Formation and Its Significance for Hydrocarbon Exploration, Northwestern Sichuan Basin
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四川盆地西北部是深层油气勘探的重点区域,围绕“开江-梁平海槽”发现多个长兴组台缘礁滩型气田. 近年,随着该油气带下的茅口组获得新的油气发现,海槽的形成时间和范围及其对茅口组有利勘探区带的约束成为新的研究热点.基于川西北地区剖面钻井资料,详细开展茅口组的岩相古地理重建. 揭示出川西北地区茅口中-晚期呈现深水相和台地相的分异,相带沉积作用造成地层厚度的带状协同差异;重建了茅口中-晚期的岩相古地理,刻画出该时期的构造-沉积分异格局;明确“开江-梁平海槽”形成时间应向前推至中二叠世晚期.总体上,茅口组深水槽沿广元-巴中-平昌一带展布,其两侧台缘是新的潜在大型油气聚集带. 沿该深水槽的构造-沉积分异形成的台缘带为初始地貌继承型边缘,具有宽边缘、薄滩体的特点,滩相结构为间断加积状,与其上长兴期镶边塑造的连续加积或进积形成的窄边缘、厚滩体模式形成鲜明对比.
古地理 / 台-槽分异 / 台地边缘 / 中二叠统 / 茅口组 / 石油地质
paleogeography / platform-trough differentiation / platform margin / Middle Permian / Maokou Formation / petroleum geology
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国家自然科学基金面上项目(42172132;41872109)
中国石油天然气股份有限公司西南油气田分公司勘探开发研究院项目(XNS勘研院JS2022-2599)
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