济阳坳陷滨海地区沙河街组隐伏剥蚀圈闭识别与描述

发布时间：2019-05-10 01:41

【摘要】：济阳坳陷滨海地区沙河街组隐伏剥蚀圈闭的地震反射特征为平行反射、空白反射甚至超覆反射等地震假象,故剥蚀尖灭点难以准确落实。研究表明研究区该类圈闭具有地层薄、夹角缓、高阻抗围岩等3个特点,难以识别的主要原因有2个:一是地震资料分辨率低,形成了平行反射;二是地层厚度薄,受高速围岩的相干作用,形成了空白反射。提出了地质条件约束下运用地球物理技术有效识别和描述隐伏圈闭的方法,即依据构造演化特征和测井及录井资料识别隐伏剥蚀圈闭,利用频率属性和提频资料描述尖灭线,并计算出剥蚀尖灭点与地层和不整合面夹角、地层厚度的关系,最终精确落实剥蚀尖灭点位置。本文提出的隐伏剥蚀圈闭识别与描述技术已成功应用于滨海地区的埕岛、孤岛、长堤、桩西、新北等油田,都取得了良好的勘探效果,对其他地区类似地层圈闭识别和剥蚀尖灭线精确落实具有借鉴意义。
[Abstract]:The seismic reflection characteristics of the hidden denudation trap of Shahejie formation in coastal area of Jiyang depression are parallel reflection, blank reflection and even overlying reflection, so it is difficult to carry out the denudation cusp point accurately. The results show that this kind of trap in the study area has three characteristics: thin strata, slow angle and high impedance surrounding rock. There are two main reasons why it is difficult to identify: first, the resolution of seismic data is low and parallel reflection is formed; Second, the thickness of the formation is thin, and the blank reflection is formed by the coherent action of the high-speed surrounding rock. A method of effectively identifying and describing hidden trap by geophysical technology under the constraint of geological conditions is put forward, that is, according to the characteristics of tectonic evolution and logging data, the hidden denudation trap is identified, and the sharpening line is described by frequency attribute and frequency raising data. The relationship between the denudation cusp point and the angle and thickness of the formation and the unconformity surface is calculated, and the position of the denudation cusp point is finally accurately realized. The identification and description technology of hidden denudation trap proposed in this paper has been successfully applied to Chengdao, Gudao, Changdi, Zhuangxi, Xinbei and other oilfields in coastal area, and good exploration results have been obtained. It is of reference significance for the identification of similar strata trap and the accurate implementation of denudation pinning line in other areas.
【作者单位】：中国地质大学(北京)能源学院;中国石油化工股份有限公司胜利油田分公司物探研究院;
【基金】：“十三五”国家科技重大专项“胜利油田特高含水期提高采收率技术(编号:2016ZX05011)”、“渤海湾盆地精细勘探关键技术(三期)(编号:2016ZX05006)”部分研究成果
【分类号】：P618.13

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