岩性油气藏 ›› 2017, Vol. 29 ›› Issue (4): 3037.doi: 10.3969/j.issn.1673-8926.2017.04.004
孙春燕1,2,3, 胡明毅1,2,3, 胡忠贵1,2,3
SUN Chunyan1,2,3, HU Mingyi1,2,3, HU Zhonggui1,2,3
摘要: 为了厘清达川—万县地区下三叠统飞仙关组鲕滩储层和白云岩储层的发育、演化及纵向分布规律,基于Vail层序地层学理论,以沉积暴露面、岩性突变面和不整合面等多种层序界面标志为依据,对典型单井进行层序划分,再结合相对海平面的升降变化,将飞仙关组划分为2个三级层序(Sq1和Sq2)及4个体系域(Sq1海侵体系域、Sq1高位体系域、Sq2海侵体系域和Sq2高位体系域),进而通过跨相区连井层序地层剖面的对比,建立了该区层序地层格架。研究表明,各体系域在区域上可对比性较强,高位体系域后期发育台地边缘鲕滩相和台地内鲕滩相沉积,且均发生了强烈的白云岩化作用,改善了岩石孔渗性;在深埋藏条件下,白云岩原生孔隙易于保存,具有一定抗压实、压溶性,为深层优质储层的形成奠定了基础。研究结果可为该区下一步天然气勘探开发提供一定地质依据。
中图分类号:
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