Origin of AVO anomaly of Jamieson Formation in deepwater area of Outer Browse Basin, Australia
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.
LIU Wenchao . Origin of AVO anomaly of Jamieson Formation in deepwater area of Outer Browse Basin, Australia[J]. Lithologic Reservoirs, 2013 , 25(2) : 70 -75 . DOI: 10.3969/j.issn.1673-8926.2013.02.012
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