Petrographic characteristcs and fractured reservoir potential of the pre-tertiary basements in Dai Hung field, Block 05-1(a), Nam Con Son basin
Abstract
The fractured granitoid basement reservoir in Vietnam is one of the most distinctive reservoirs in the world, accounting for 82% of the total country’s oil production [1]. The Dai Hung oil field locates in Block 05-1(a) on Mang Cau High in Nam Con Son basin, where the pre-Tertiary basement was formed contemporaneously with the basement of the Cuu Long basin and magmatic Dalat zone. In the Dalat zone, magmatic intrusives belong to the suites of Dinh Quan, Deo Ca and Ca Na (Ankroet). The presence of an active petroleum system in the Nam Con Son basin is proven by a series of oil and gas fields. In this system, Oligocene and Early Miocene effective source rocks are matured, generating hydrocarbons that are charged to clastic reservoirs. The basement in the Dai Hung field, mainly composed of granodiorite interbedding with dykes, were penetrated by 24 wells with basement section drilling depths ranging from 10 m to 1043 m. Seismic and well data reveal two major fracture systems striking NE-SW and sub E-Wn. This study aims to elucidate the reservoir potential of the fractured granodioritic basement in Dai Hung field.
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