歧口凹陷西斜坡(滩海)岩性圈闭成藏条件分析与目标研究

Forming conditions of lithologic trap and target study in the western slope(tidal zone) of Qikou depression

歧口凹陷西斜坡东营组各层段发育大型岩性圈闭,勘探程度低、勘探潜力大,是滩海区重要的后备勘探战场。运用坡折带控砂理论,根据研究区具体的地震地质条件及勘探程度,利用不同的地球物理技术识别砂体;唐东地区东营组利用全三维反演技术开展储层预测工作;白水头—驴东地区板0、板1油组利用属性技术开展砂体分布研究;歧口凹陷凹槽区利用地震地层学解释技术研究砂体分布。在此基础上综合评价优选出4个成藏条件优越、可供钻探的大型有利岩性圈闭目标,取得了较好的勘探成果。本次工作取得的多项地质新认识,可有效指导相似地质条件地区岩性圈闭研究。

Large lithologic traps had developed in Dongying formation of the western slope of Qikou depression where the degree of prospecting is low and the exploration potential is big.This is an important standby exploration field in this tidal zone.Sand bodies are identified by using various geophysical methods according to seismic geological condition and the degree of prospecting.Reservoirs of Dongying formation in Tangdong area are predicted through full 3D inversion.The distribution of sands in Ban0 and Ban1 oil unit in Baishuitou-Ludong area is studied by using attribute method.The distribution of sands in the trough zone of the depression is studied by using seismic stratigraphic interpretation method.4 large lithologic trap targets are selected for exploration drilling and good exploration result has been achieved.The geological knowledge obtained from this study may guide lithologic trap study in areas with similar geological conditions.