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王府凹陷扶余油层河道砂体发育,地层等时划分对比存在较大难度。以高分辨率层序地层学原理为指导,依据岩心、录井和测井等资料对王府凹陷扶余油层各级次基准面旋回进行划分、对比和沉积特征分析,将其划分为2个中期(MSC1、MSC2)、6个短期(SSC1~SSC6)和17个超短期基准面旋回(FIII5~FI1),并建立层序地层对比格架。MSC1包括基准面快速下降和缓慢下降两个阶段,分别对应扶三组和扶二组;MSC2表现为缓慢上升,对应于扶一组。中期、短期旋回在王府凹陷扶余油层稳定发育,在中期旋回的转换面附近中期基准面下降到最底点,河道砂体非常发育;研究区扶余油层以三角洲平原沉积环境为主,在顶部过渡为三角洲前缘。
The development of sand bodies in the river bank of Fuyu oil reservoir in Wangfu Sag and the stratigraphic division of isochronous strata have great difficulty. Guided by the principle of high-resolution sequence stratigraphy, according to the data of core, logging and well logging, the datum plane cycles of Fuyu oil layer in Wangfu Sag were divided and compared, and the sedimentary characteristics were analyzed. They were divided into two medium-term MSC1 and MSC2), six short-term (SSC1-SSC6) and 17 ultra-short-term base-level cycles (FIII5-FI1) and establish a sequence stratigraphic contrast grid. MSC1 includes two stages: rapid decline and slow decline of datum, corresponding to Fu3 and Fu2 respectively; MSC2 showed a slow rise corresponding to Fu1. The mid-term and short-term cycles developed steadily in the Fuyu oil layer in the Wangfu Sag. The mid-term baselines near the mid-term transition fell to the lowest point and the channel sand body developed very well. The Fuyu oil layer in the study area was dominated by sedimentary environment in the delta plain and transitional at the top Delta front.