四川盆地涪陵地区龙马溪组含气页岩段上部气层平面非均质性特征及其发育主控因素
包汉勇 , 孟志勇 , 李凯 , 常振 , 郁飞 , 易雨昊 , 赵天逸
地球科学 ›› 2023, Vol. 48 ›› Issue (07) : 2750 -2763.
四川盆地涪陵地区龙马溪组含气页岩段上部气层平面非均质性特征及其发育主控因素
Plane Heterogeneity Characteristics and Main Controlling Factors of Development of Upper Gas Layer in Gas-Bearing Shale of Longmaxi Formation in Fuling Area, Sichuan Basin
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涪陵地区五峰组‒龙马溪组底部发育一套富有机质页岩,依据页岩品质、含气性将该套页岩储层纵向上细分为9个小层,并明确下部①~⑤小层优质含气页岩段为主力开发层系.2017年,焦石坝区块针对龙马溪组一段上部中低品位页岩气层(⑥~⑨小层)启动了分层开发调整工作并取得了较好成效,但是上部气层页岩品质及厚度在平面上具备较强的非均质性,影响了分层开发调整工作的正常推进.通过对海底古地貌、水动力条件等开展系统研究,明确了上部气层的平面非均质性特征及其发育主控因素.上部气层自涪陵地区南部和北部向中部梓里场‒白涛地区由混合页岩相(粘土和陆源石英二元混合)转变为长英质页岩相(岩矿以陆源长英质为主)和粘土页岩相,页岩品质略有变差,中部梓里场‒白涛地区的北缘和南缘⑦小层出现明显减薄,普遍缺失上半段;同时在部分井区缺失⑦~⑨小层,缺失区呈现北东向条带状展布.构造火山活动、海平面升降、海底古地貌、陆源供给及底流沉积作用共同控制了上部气层的平面非均质性展布特征.
五峰组‒龙马溪组 / 上部气层 / 页岩气 / 储层非均质性 / 主控因素 / 底流作用 / 海底古地貌 / 涪陵 / 四川盆地
Wufeng Formation-Longmaxi Formation / upper gas layer / shale gas / reservoir heterogeneity / main controlling factor / bottom current / seabed paleogeomorphology / Fuling / Sichuan Basin
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中国石化股份公司科研项目(P22045)
国家重大专项(2016ZX05060)
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