摘要
对鄂尔多斯盆地靖安油田上三叠统延长组长6段岩相、沉积微相类型、垂向序列和沉积相格局进行的研究表明,长6段为大型河流入湖卸载的三角洲—湖泊相沉积,并且是一个完整的复合三角洲沉积体,包含了发育齐全的前三角洲、三角洲前缘以及三角洲平原3个亚相。在平面上,三角洲总体表现出向南西方向的不均匀指状进积,形成了鸟足状三角洲;在垂向上,长61表现为相对较浅水的三角洲,分流河道最发育,长62为相对较深水的三角洲,水下分流河道和河口坝发育。
Lithofacies, sedimentary microfacies type, vertical successions and sedimentary facies pattern were studied in the sixth Member ( Chang 6 ) of Yanchang Formation of upper Triassic, Jin-gan oilfield,Ordos basin. It is realized that the Chang 6 member is the deltaic lacustrine body deposited where large rivers enter into lake and discharge. In fact, it is a full complex delta deposit, which includes such full sedimentary subfacies as prodelta, delta front and delta plain. The delta behaved as unevenly fingering progradation toward southwest on space and produced a so - called high constructive bird feet - like delta, wherever the delta temporally behaved as a relatively shallow delta which has prosperous distributary channel during Chang 61 and a relatively deep delta which has prosperous underwater distributary channel and mouth bar during Chang 62.
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2006年第5期11-14,共4页
Petroleum Geology and Recovery Efficiency
基金
中国石油天然气集团公司创新基金项目(04E70723)资助
关键词
上三叠统
长6段
沉积微相
三角洲
靖安油田
鄂尔多斯盆地
upper Triassic,Chang 6 Member,sedimentary microfacies,delta,Jingan oilfield,Ordos basin
