岩性油气藏 ›› 2022, Vol. 34 ›› Issue (5): 8699.doi: 10.12108/yxyqc.20220507
苏亦晴, 杨威, 金惠, 王志宏, 崔俊峰, 朱秋影, 武雪琼, 白壮壮
SU Yiqing, YANG Wei, JIN Hui, WANG Zhihong, CUI Junfeng, ZHU Qiuying, WU Xueqiong, BAI Zhuangzhuang
摘要: 川西北地区三叠系须家河组深层碎屑岩是重要的天然气勘探领域,储层质量对气藏发育规模至关重要。应用岩心、露头、地震和测井等资料,对川西北地区三叠系须家河组储层特征及其主控因素进行了分析,并对有利储层发育区进行了评价。研究结果表明:①川西北地区三叠系须家河组深层有效储层属低孔低渗储层,主要发育于三角洲水下分流河道、河口砂坝等微相,岩性以粗砂岩和含砾细砂岩为主,储集空间主要为原生孔、粒内和粒间溶蚀孔及裂缝。②研究区有效储层的发育主要受沉积微相、成岩作用和构造破裂作用等因素控制。水下分流河道砂体最为有利;溶蚀作用形成溶蚀孔隙,并对原生孔隙进行改造,有效提高了砂体物性;构造破裂作用产生的构造裂缝对有效储层的形成具有重要影响。③研究区须家河组三角洲前缘水下分流河道发育大面积砂体,较多的原生孔隙在早期快速埋藏过程中得以保存;在后期埋藏成岩过程中,烃类生成过程中产生的有机酸使得岩石产生了大量溶蚀孔隙;喜山期构造运动形成的大量裂缝优化了储层物性。④川西北地区三叠系须家河组相对优质储层主要分布于老关庙—文兴场—柘坝场、中台山、黎雅庙及剑门关等4个区域。
中图分类号:
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