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The AAPG/Datapages Combined Publications Database

Southeast Asia Petroleum Exploration Society (SEAPEX)

Abstract


Offshore South East Asia Conference, 1998
Pages 85-96

The “Vicky Discovery” in the East China Sea: A New Marine Palaeocene Hydrocarbon System, Offshore China

A. Soulsby, G. M. Wang

Abstract

This paper summarises the results of Primeline’s Vicky-1 exploration well (drilled 1997) which tested potentially commercial quantities of hydrocarbons from a new Palaeocene reservoir in the Lishui Sub-basin, East China Sea Basin. This well represents an exploration breakthrough after a sequence of 14 unsuccessful wells drilled by foreign operators on acreage awarded in the First East China Sea Licensing Round in 1993.

The discovery confirmed Primeline’s pre-drilling exploration concept and has established a new hydrocarbon Previous HitplayNext Hit system which Primeline believes has significant additional exploration potential. The Previous HitplayNext Hit system is characterised by a sequence of stacked marine sandstone reservoirs which are coincident with mature source rocks and are overlain by good regionally-extensive sealing cap rocks.

Source rocks are interpreted as marine but containing mostly type III kerogen and therefore gas prone. Modelling suggests that the main period of hydrocarbon genesis predates the latest structural phase and therefore points to multiple potential trapping scenarios, both structural and stratigraphic.

The Vicky-1 well tested at a rate of 9.8MMcf/D (0.279×106m3/d) of gas and 117BPD (8.9 m3/d) of hydrocarbon liquids from the topmost part of a reservoir column of several hundred metres gross thickness. “Most Likely” reserves are estimated at 660Bcf (18.7×109m3) with estimated upside including appraisal and nearby-exploration potential of 4.4TCF (125×109m3).

The Marine Palaeocene “Previous HitplayTop fairway” parallels the coastline’ of China’s most dynamic and energy-hungry provinces and is ideally located to allow commercialisation of even small future reserves additions.


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