实用地球物理技术在渤中探区岩性勘探中的应用

Application of the Pragmatic Geophysical Techniques to Exploration of Lithological Traps in Bozhong Exploration Area

谷志猛 杨海风 王军 李果营 王思权

GU Zhimeng YANG Haifeng WANG Jun LI Guoying WANG Siquan

中海石油(中国)有限公司天津分公司渤海油田勘探开发研究院, 天津塘沽 300452

Institute of Petroleum Exploration and Development of Bohai Oilfield Company, CNOOC, Tianjin 300452, China

针对渤中探区Q构造新近系近十年探索没有取得突破性进展,借鉴周边成熟油田浅层岩性勘探的思路,以地质认识为指导,以精细构造解释和岩性圈闭刻画为核心,综合运用地层切片、地震属性分析、90度相移及低幅度构造变速成图等多项地球物理技术,对新近系明下段浅水三角洲岩性圈闭进行精细识别与刻画。结果表明:地层切片结合地震属性技术有效识别砂体平面展布特征,90度相移技术辅助完成砂体精细刻画,低幅度构造变速成图技术真实反映砂体构造特征。通过多项地球物理技术的应用,相继发现了Qa、Qb/c及Qd等一系列浅层岩性含油气构造,掀起了渤海海域浅层岩性勘探的热潮,同时也对相似地质背景探区具有借鉴意义。

The exploration of Q structure in Bozhong prospect area has been almost ten years, however, no great break through has been made. On the basis of the lithology exploratory thinking of the peripheral mature oil field, guided by the recent geological theo-ries, new geophysical techniques to identify and describe the lithologic traps have been used in shallow water delta in Neogene by fine structure elucidation and description, such as the strata slice, the seismic attribute analysis, the 90° phase shift and the velocity-variant mapping. The study results indicated that the strata slice and seismic attribute analysis techniques can be used successfully to identify the complex characteristics of lithologic traps, the 90° phase shift can be used to describe the lithologic traps, and the veloc-ity-variant mapping can reflect truly the tectonic character of lithologic traps. Through application of these techniques, a series of the shallow layer lithological hydrocarbon bearing structures, such as Qa, Qb/e and Qd have been discovered, resulting in high upsurge for exploration of shallow water lithological traps in the Bohai Sea. In addition, it is also useful for exploration of lithological traps with the similar geological background.

国家科技重大专项"近海隐蔽油气藏勘探技术"(2011ZX05023-002)

https://doi.org/10.3969/j.issn.1008-2336.2014.01.017