T3 3 reflecting layer is the geological interface between the main exploration layers of E 1 f2 and E1 f1 in Gaoyou Sag,and also the important seismic layer of E 1 f1 structural trap.The basic characteristics of its reflection wave group are three strong phases .The drilling practice in Xuzhuang area proved that reflection characteristics of T 3 3 seismic wave in the area had been changed .Combined with the knowledge of geology ,the forward modeling technique was used to research the characteristics and formation mechanism of T 3 3 reflection wave group in Wazhuang and Xuzhuang area of Gaoyou Sag .The formation mechanism of T 3 3 seismic reflection standard layer in Xuzhuang was defined ,and the corresponding relationship between the lithologic features and the seismic reflection characteristics was built .The research can provide theoretical ba-sis for the structure interpretation and trap description of the area .

高邮凹陷北斜坡中段地震资料品质差,主要目的层反射特征不明显。该区属复杂小断块区,发育多套断裂系统,断层关系复杂,断块破碎,并且发育辉绿岩侵入体,对正常地层反射形成屏蔽,增加了构造解释难度。针对该区地震解释中的难题,我们应用层位综合标定、剖面解释、平面解释、正演模型等技术,探索出一套适合该区的地震综合解释方法,在该区的油气勘探中取得了显著的效果。

Full 3D explanation is an advanced intuitive interpretation technique. Although it is still difficult to fully implement this technique in complex tectonic belt interpretation where geological information is of poor quality,the use of this technique to replace part of traditional interpretation work can help us avoid subjectivity and greatly improve efficiency and accuracy of interpretation.

根据断陷湖盆边界断裂及伴生次级断层的剖面形态、平面展布和应变机制,将高邮凹陷南部陡坡带的边界断裂结构分为单断式和阶梯式2种。不同断裂结构影响着盆地沉积、充填过程和地貌特征,从而影响了其中储层的发育程度、生储盖组合、圈闭类型及油气成藏规律。研究表明:高邮陡坡带戴南组油藏具有断裂沟通油气、断层控砂沉积、垂向运移为主、上下叠合成藏的成藏模式。

高邮凹陷面积约4500km2,是苏北盆地资源潜力最大、油气最富集的凹陷,长期以来以构造勘探为主。随着勘探的深入,有利构造油气藏越来越少,寻找隐蔽油气藏成为必然。与众不同,高邮凹陷有构造破碎、生烃强度低、油气分布散、生储盖分属不同层系且组合单一等特点。针对这些特点,通过层序地层学研究和综合地质评价选区选带,以及高分辨率三维地震技术精细落实构造,运用地震属性、地震反演等预测技术,尤其是反演预测中曲线重构、叠前弹性波反演等特殊手段,最终多口探井获得成功,取得了显著的经济效益。

The exploration in south fault-terrace belts of Gaoyou Depression is of low benefit owing to its fractured structure and complex oil-forming condition.We think that the area has great potential for petroleum exploration through analyzing the conditions of structure,oil source,secondary migration of hydrocarbon,reservoir,preservation and the quality of seismic data.And we can gain big breakthrough in petroleum exploration as long as we strengthen our recognition ability in structure and analyze the law of reservoir generation.

Grand SN area is one of the most important exploration areas of Gaoyou Depression.It is a diabase growth area,with poor-quality seismic data.On the basis of emphasizing geologic recognition,dimensional distribution of diabase in this area is studied,as well as its impact on seismic data.Grand SN area is divided into South SN and North SN by distribution and growth features of diabase.For comprehensive interpretation of faults and horizons,various seismic exploration techniques,e.g.3D visualization and coherent volume technique,are used integratedly in South SN and new geological models are applied in North SN,from which satisfactory exploration results have been achieved.