技术方法

澳大利亚布劳斯盆地深水区Jamieson组AVO 异常成因分析

  • 刘文超
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  • 中海油研究总院,北京100027
金莉(1965-),女,高级工程师,从事油气勘探研究工作。 地址:(100027)北京市东城区东直门外小街 6 号海油大厦。 电话:(010)84523592。 E-mail:jinli@cnooc.com.cn

网络出版日期: 2013-04-20

基金资助

国家重大科技专项“海洋深水区油气勘探关键技术”(编号:2008ZX05025)资助

Origin of AVO anomaly of Jamieson Formation in deepwater area of Outer Browse Basin, Australia

  • LIU Wenchao
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  • CNOOC Research Institute, Beijing 100027, China

Online published: 2013-04-20

摘要

针对澳大利亚布劳斯盆地深水区钻探的失利,通过目的层 Jamieson 组岩心薄片鉴定,结合区域沉积环境分析,对该区深水区钻探进行了综合分析。 结果表明:这套硅质岩和硅质泥岩的特殊岩性体中富含放射虫与硅藻,且虫体内微孔隙发育,由于处于成岩演化的早期 B 阶段,微孔隙得以保存,使岩石具有高束缚孔和低密度的特征,从而产生了测井上的“含气砂岩”特征和地震上的 AVO 异常。 类似的 AVO 异常并不少见,尤其是在深水浅层沉积中,而事实上这类异常是由岩性造成的,并不表示含气,因此,今后的深水区勘探应注意规避此类风险。

本文引用格式

刘文超 . 澳大利亚布劳斯盆地深水区Jamieson组AVO 异常成因分析[J]. 岩性油气藏, 2013 , 25(2) : 70 -75 . DOI: 10.3969/j.issn.1673-8926.2013.02.012

Abstract

Based on core thin sections analysis and regional sedimentary settings, this paper carried out a comprehensive analysis of the exploration of Jamieson Formation inW-1 well in Outer Browse Basin, Australia. The result shows that Jamieson Formation is a set of Aptian-Cenomanian bio-siliceous rock to be of rich radiolarians and diatoms, and micro-porosity developed inside the foraminifer. The bio-siliceous rock is at a phase of early diagenetic B between opal A to opal CT transition with substantive micro-pores survived and is of high-bounded porosity and low density. The false gas-bearing reservoir in CMR log and AVO anomaly are caused by such petrographic characteristics. In fact, the bio-siliceous rock of Jamieson Formation is poor reservoir. Similar cases with false-DHI are not uncommon, especially in the shallow targets in deep-water and should be take notice of exploration.

参考文献

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