岩性油气藏 ›› 2026, Vol. 38 ›› Issue (1): 1325.doi: 10.12108/yxyqc.20260102
孟阳1(
), 曹小朋2, 赵浩2,3(
), 杨明林2, 李志鹏4, 田振磊2, 乌洪翠2, 蒋越2
MENG Yang1(
), CAO Xiaopeng2, ZHAO Hao2,3(
), YANG Minglin2, LI Zhipeng4, TIAN Zhenlei2, WU Hongcui2, JIANG Yue2
摘要:
天然裂缝的发育程度是影响准噶尔盆地永进地区侏罗系齐古组单井产能的关键因素。结合野外露头、岩心、薄片、测井和试验等资料,对齐古组致密砂岩天然裂缝成因类型、发育特征和主控因素进行了详细研究,并预测了其有利发育区。研究结果表明:①准噶尔盆地永进地区侏罗系齐古组致密砂岩储层天然裂缝成因类型多样,主要包括成岩裂缝、少量构造裂缝和异常超压裂缝,其中成岩裂缝以层理缝为主,发育少量粒缘缝和粒内缝。天然裂缝是深层优质储集层形成的重要因素之一。②研究区齐古组裂缝的发育主要受沉积作用、构造应力和超压的控制,沉积微相通过控制岩性、矿物成分、沉积构造等因素来控制裂缝发育程度,分流砂坝中上部的中细砂岩为裂缝发育的有利场所;喜山期近南北向构造挤压应力是研究区构造裂缝和层理缝开启的重要动力,断层1 km范围内裂缝较发育;异常超压对超压缝和层理缝的开启以及裂缝的保存具有重要作用,研究区北部异常超压发育程度高,储层裂缝较发育。③研究区齐古组有效天然裂缝主要发育在压力系数大于1.6、断层北部的层状分流砂坝区。
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