澳大利亚布劳斯盆地深水区Jamieson组AVO异常成因分析
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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。
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 biosiliceous rock to be of rich radiolarians and diatoms, and microporosity developed inside the foraminifer. The biosiliceous rock is at a phase of early diagenetic B between opal A to opal CT transition with substantive micropores 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 biosiliceous rock of Jamieson Formation is poor reservoir. Similar cases with false-DHI are not uncommon, especially in the shallow targets in deepwater and should be take notice of exploration.
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 biosiliceous rock to be of rich radiolarians and diatoms, and microporosity developed inside the foraminifer. The biosiliceous rock is at a phase of early diagenetic B between opal A to opal CT transition with substantive micropores 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 biosiliceous rock of Jamieson Formation is poor reservoir. Similar cases with false-DHI are not uncommon, especially in the shallow targets in deepwater and should be take notice of exploration.
引文
[1]Longley I M,Buessenschuett C,Clydsdale L.The North West Shelf of Australia-A woodside Perspective[C]∥Keep M,Moss S J.The Sedimentary Basins of Western Australia3.Proceedings of the Petroleum Exploration Society of Australia Symposium,Perth,2002:27-79.
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[6]房殿勇,王汝建,邵磊,等.南海ODP1148站深海相渐新统硅质成岩作用[J].海洋地质与第四纪地质,2002,22(2):75-79.
[7]熊翥.地层岩性油气藏勘探[J].岩性油气藏,2008,20(4):1-8.
[2]Edwards J D,Santogrossi P A.Divergent/passive margin basins[G].AAPG Memoir48,1990:102-106.
[3]Jason R,McMurtrie G,Keall J.Hydrocarbon potential of the Outer Browse Basin,NW Australia[C].AAPG Deepwater and Frontier Symposium,2004:497-507.
[4]Bradshaw M T,Yeates A N,Beynon R M,et al.Palaeogeographic evolution of the North West Shelf Region[C]∥Purcell P G,Purcell R R.The North West Shelf,Australia.Proceedings of the Petroleum Exploration Society of Australia Symposium,Perth,1988:29-54.
[5]Parry J C,Smith D N.The barrow and exmouth sub-basin[C]∥Purcell P G,Purcell R R.The North West Shelf,Australia.Proceedings of the Petroleum Exploration Society of Australia Symposium,Perth,1988:129-145.
[6]房殿勇,王汝建,邵磊,等.南海ODP1148站深海相渐新统硅质成岩作用[J].海洋地质与第四纪地质,2002,22(2):75-79.
[7]熊翥.地层岩性油气藏勘探[J].岩性油气藏,2008,20(4):1-8.
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