岩性油气藏 ›› 2026, Vol. 38 ›› Issue (2): 3243.doi: 10.12108/yxyqc.20260203
余川1,2,3(
), 吴晓川1,2(
), 汪威1,2,3, 汪生秀1,2,3, 张跃磊1,2,3, 郭东鑫1,2,3, 刘爱华1,2,4
YU Chuan1,2,3(
), WU Xiaochuan1,2(
), WANG Wei1,2,3, WANG Shengxiu1,2,3, ZHANG Yuelei1,2,3, GUO Dongxin1,2,3, LIU Aihua1,2,4
摘要:
川东地区下侏罗统凉高山组和自流井组湖相暗色泥页岩广泛发育,是页岩油气勘探的重要领域。通过对重点钻井、典型地层剖面进行描述和取样分析测试,开展了陆相页岩岩相组合类型的划分,并对不同岩相页岩的油气成藏条件进行了对比。研究结果表明:①川东地区下侏罗统陆相页岩层系沉积相变快、岩相组合复杂,与下古生界海相页岩相比,前者具有“发育层数多、累积厚度大(40~115 m)、单层厚度小(< 25 m)、连续性较差”的特征。②研究区下侏罗统陆相页岩可划分为硅质页岩、黏土质页岩、介壳灰质页岩等三大类,不同岩相类型的岩性特征差异大,主要受控于其原始沉积环境。③纹层状含碳黏土质页岩和含碳含介壳黏土质页岩的生烃能力及储集性能都相对较好,其有机质类型主要为偏腐泥混合型(Ⅱ1型为主),TOC多在1.2%以上,有机质孔和微裂隙较发育,有效孔隙度多在3.0%以上,具备压裂改造的有利条件,是油气富集成藏的有利岩相类型。④研究区凉高山组页岩油气成藏有利区分布在万州—梁平地区和垫江—丰都地区;自流井组大安寨段油气成藏有利区分布在梁平—开江—万州地区;自流井组东岳庙段油气成藏有利区分布在垫江—梁平—忠县地区。
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