Abstract:

The sublacustrine fan deposits were discovered in the K₂qn1 and K₂qn2 of Yingtai-Talaha area of Songliao Basin by using the integrated methodology of geology and geophysics.The data of well bore,testing,core and thin section showed that the sublacustrine fan deposits were resulted from the entire slump and short-distance transportation of sand bodies in the fan delta front of Yingtai area.The sublacustrine fan was characterized by the sensible seismic response.The 3D seismic data from Yingtai-Talaha area were applied to determine the geophysical response characteristics of the sublacustrine fan,to describe the distribution of sand bodies and to define the boundary and distribution range of the sublacustrine fan by the fine calibration of logs and seismic reflection event,and the extraction of seismic dynamic parameters,horizontal section and reservoir inversion.The integrative analyses showed that reservoir sand bodies of the sublacustrine fan stacked in plane and stretched in the shape of a lens in space.It indicates that the sublacustrine fan has beneficial exploration potentiality,and the lithologic reservoirs are the main exploration targets.

Key words: Songliao Basin, Qingshankou Formation, sublacustrine fan, sedimentary characteristics, geophysical response, lithologic reservoir

摘要：

综合利用井筒资料、分析化验资料、岩心资料和薄片鉴定资料,研究了松辽盆地英台—他拉哈地区青一、二段湖底扇的沉积特征。结果表明,湖底扇由英台扇三角洲前缘相带的砂体整体滑塌并近距离搬运所形成,形成过程具多期次性。湖底扇具有敏感的地震响应。充分利用三维地震资料,通过井震精细标定、地震动力学参数提取、等时切片、储层反演等综合手段,精细刻划了砂体的空间分布特征。综合分析认为,湖底扇在平面上叠加连片,空间上呈透镜体展布;湖底扇具有较大油气勘探潜力,勘探目标以岩性油藏为主。

关键词: 松辽盆地, 青山口组, 湖底扇, 沉积特征, 地球物理响应, 岩性油藏