无为盆地周冲村组膏盐层地震响应特征研究及其油气地质意义
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齐尚星(1989-),男,硕士,工程师,主要从事地质勘查及相关研究工作。E-mail:451532093@qq.com。

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中国地质调查局项目《苏皖赣地区页岩油气战略选区调查》(DD20190565,DD20201171);《苏皖地区页岩气地质调查》(DD20190083)


Seismic response characteristics of the gypsum-salt layer in the Zhouchongcun Formation of the Wuwei Basin and its petroleum geological significance
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    摘要:

    膏盐层作为油气田的主要盖层,对油气藏封存具有重要意义。文章在无为盆地开展二维地震勘探工作的基础上,运用井震联合对比分析方法,总结区域内膏盐层的地震响应特征,较细致地刻画无为盆地周冲村组膏盐层的厚度和空间分布规律。研究结果表明:膏盐层厚度与地震振幅属性具有一定的正相关性,地震振幅越强,膏盐层厚度越大;无为盆地膏盐层在纵向上厚度变化范围为45~540 m,横向上在盆地核心区和凹陷区膏盐层发育较厚,主体介于300~500 m之间,在盆地构造高点位置膏盐层发育较薄,主体介于50~150 m之间,膏盐层分布特征与无为盆地构造总体呈现“低厚高薄”规律。文章为无为盆地天然气和页岩气勘探突破提供了技术保障。

    Abstract:

    The gypsum-salt layer, as the main cap rock of oil and gas fields, is of considerable importance for the sealing of oil and gas reservoirs. On the basis of a 2D seismic exploration in Wuwei Basin, the seismic response characteristics and spatial distribution regularity of the gypsum-salt layer in Zhouchongcun Formation were analyzed using the integrated analysis method of well logs and seismic data. Results indicate a certain positive correlation between the thickness of the gypsum-salt layer and the seismic amplitude attribute. A thick gypsum-salt layer leads to a strong seismic amplitude. The thickness of the gypsum-salt layer varies from 45 to 540 m in the longitudinal direction. Horizontally, the gypsum-salt layer is relatively thick in the core and depression areas of the basin, and the main part is between 300 and 500 m. The gypsum-salt layer is relatively thin in the structurally high position of the basin, and the main body is between 50 and 150 m. The distribution characteristics of the gypsum-salt layer generally show that the low tectonic position corresponds to a thick gypsum-salt layer, and the high tectonic position corresponds to a thin gypsum-salt layer. This study provides a technical guarantee for the breakthrough of natural and shale gas exploration in the Wuwei Basin.

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齐尚星,谭静,喻兵良,熊强青,袁兴赋,吴通,汪玉玲,郑雪静,陈杰.无为盆地周冲村组膏盐层地震响应特征研究及其油气地质意义[J].地震工程学报,2024,(2):335-342. I Shangxing, TAN Jing, YU Bingliang, XIONG Qiangqing, YUAN Xingfu, WU Tong, WANG Yuling, ZHENG Xuejing, CHEN Jie. Seismic response characteristics of the gypsum-salt layer in the Zhouchongcun Formation of the Wuwei Basin and its petroleum geological significance[J]. China Earthquake Engineering Journal,2024,(2):335-342.

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  • 收稿日期:2022-10-12
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  • 在线发布日期: 2024-03-17