Lithologic Reservoirs ›› 2013, Vol. 25 ›› Issue (2): 70-75.doi: 10.3969/j.issn.1673-8926.2013.02.012

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

JIN Li， LUO Zhongqiang， LI Ping   

  1. CNOOC Research Institute， Beijing 100027， China
  • Online:2013-04-20 Published:2013-04-20

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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.

Key words: entropy weight algorithm, heterogeneous synthetic index, heterogeneity, remaining oil distribution, Matouzhuang Oilfield

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