方正断陷方3井区三维地震资料构造精细解释及储层预测

3D seismic data fine structural interpretation and reservoir prediction in Fang-3 Well Block,Fangzheng Rift

基于方正断陷方3井区三维地震资料和钻井资料,本文通过对T1、T5层位进行构造精细解释,发现该区主要发育北东向和北西向两组断裂,两组断裂交叉形成该区的断块圈闭。此外,本文应用基于模型的波阻抗反演方法,对古近系底砂岩及其上部的含煤泥岩进行横向预测。预测结果认为该区古近系底砂岩最大厚度为38m,面积为24km2;含煤泥岩全区均有分布,最大厚度为120m,是该区主要盖层;该区油气藏可能为岩性封堵的地层—岩性油气藏。

Based on 3d seismic data and drilling data in Fang-3 Well Block in Fangzhen Rift,the T3、T5 horizons were interpreted in detail in this paper,it was found out that the NE and NW fracture systems were developed in this area,the two fracture systems cross with each other to form the fault-block trap in this area.By application of model-based impedance inversion method in this paper,the Paleogene bottom sandstone and coal-bearing shale above the sandstone were predicted laterally.The prediction results show that the maximum thickness of the Paleogene bottom sandstone is 38m,it distributed in 24 sqare kilometers,the coal-bearing shale distributes in the whole area,its maximum thickness is 120m,it is the main cap rock in this area,the reservoirs in this area probably belong to the lithology-plugging stratigraphic-lithologic reservoirs.