岩性油气藏 ›› 2020, Vol. 32 ›› Issue (2): 1423.doi: 10.12108/yxyqc.20200202
刘建宁1,2, 何幼斌1,2, 王宁1,2, 顾志翔1,2, 郝烃3, 刘亚伟4
LIU Jianning1,2, HE Youbin1,2, WANG Ning1,2, GU Zhixiang1,2, HAO Ting3, LIU Yawei4
摘要: 为研究济阳坳陷惠民凹陷沙三段古地震事件沉积特征及其控藏作用,开展了钻井岩心观察、震积岩单井垂向序列划分、沉积主控因素分析和古地震事件地质意义研究。结果表明:①惠民凹陷沙三段沉积地层中,震积岩构造十分发育,包括震裂、自碎角砾、阶梯状小断层、液化岩脉、液化卷曲、液化角砾和其他脆塑性变形构造。②地震强度、沉积物固结程度和地形坡度均是影响震积岩发育的主要因素,多口井的垂向沉积序列显示,研究区不同构造位置的震积岩发育特征存在差异,可分为4个区域,分别为近震源平缓区、主震区、近震源坡度区、远震源平缓区。③地震事件沉积研究为惠民凹陷断层活动速率、生长指数等参数的确定提供了依据,且地震事件是激发砂体二次运移的重要动力源;地震事件中的震动可造成未固结的沉积物发生颗粒重排,降低沙三段储层的非均质性。④断层附近丰富的脆性震积构造可能成为油气运移的辅助通道,地震形成的自碎角砾岩为良好的储集层,液化均一的压实层为优质盖层。该研究结果对惠民凹陷震积岩油气勘探具有重要的指导意义。
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