【摘要】 通过对海拉尔盆地苏仁诺尔油田南二段油层岩性组合、粒度分析、重矿物组合特征及断裂活动等方面的研究,对南二段的浊积岩沉积特征及其形成机理进行了分析,结果表明:研究区南二段油层浊积岩主要来源于凹陷东西两侧的扇三角洲前缘砂体,以西侧物源为主;岩性组合以含砾细砂岩、细砂岩和粉砂岩为主,多呈正韵律,夹于深灰色湖相泥岩中,与泥岩呈突变接触,常见鲍玛序列的B段,底部常见冲刷面;粒度概率曲线和C–M图均具有典型浊流沉积特征;南二期,控陷断层活动强烈,地震活动为主要诱发产生滑塌的外界机制,处于同沉积断层活动区域的扇三角洲前缘砂体容易向下降盘一侧深水区域发生二次搬运,形成一系列与断层走向相垂直的滑塌浊积岩砂体。研究结果为海拉尔盆地进一步的勘探评价提供了一定的理论指导作用。更多还原

【Abstract】 Through the study of the lithology combination,grain size analysis,heavy minerals assemblage characteristics and the faults activities of Nantun II formation in Surennuoer Oilfield,the sedimentary characteristics and generation mechanism of the turbidite are analyzed. The results indicate that the Nantun II formation turbidite from Surennuoer Oilfield is mainly sourced by the pro-delta sand bodies on both the west and east side of the depression,with the western provenance as the primary one. The lithology is composed of dark grey middle to fine grain size sandstone and siltstone,with positive rhythm,usually embedded within the dark grey lacustrine shale. The contact between the shale and the sand bodies is quite sharp,and the B section of the Bauma sequence is commonly seen,and the scour surface is seen at the bottom. The C – M chart and the statistics curve of grain sizes are characterized by typical turbidite. When the Nantun II formation was deposited,the faults,which control the depression,were quite active and the resulting seismic activities could be the external mechanism for the slump. For syn-depositional pro-delta sand bodies located within the faults active areas are prone to the secondary migration,resulting a series of slump turbidite sand bodies which are perpendicular to the strike of the faults. The results provides some guidance for the further exploration and evaluation in Hailaer Basin.更多还原