Scientific Contribution Oil and Gas
Vol 35, No 2 (2012)

Oligocene Palynology Of On-Shore West Java

Lelono, Eko Budi (Unknown)



Article Info

Publish Date
10 Mar 2022

Abstract

Compared to its counterpart in the off-shore area (including Northwest Java and Northeast Java), the Oligocene sediment of on-shore West Java provides low pollen assemblages. In addition, superwet elements of Dacrydium and Casuarina commonly occurred in off-shore area are less represented in the on-shore area. However, it is believed that the study area still experienced wet climate condition as proved by common occurrence of rattan pollen Dicolpopollis spp. indicating a thick growth of swamp forest under moist climate. Unlike its counterpart in the off-shore North West Java, the studied sediment rarely yields lacustrine elements suggesting the disappearance of lake deposit. The Oligocene sediment of on-shore West Java is defi ned by the regular appearance of Oligocene marker of pollen Meyeripollis naharkotensis. The last occurrence of this pollen marks the top Oligocene age. In fact, the appearance of pollen M. Naharkotensis is obviously used to separate Oligocene age from Miocene age in the off-shore area. Moreover, marine micropaleontology analysis on foraminifers and calcareous nannoplankton confi rms this age. The studied sediment was deposited in the transition to shallow marine environment as indicated by rare occurrence of marine microfossils. The common brackish pollen of Zonocostites ramonae (Rizophora) and Spinizonocolpites echinatus (Nypa) indicates mangrove/ back-mangrove environment. Moreover, the domination of shallow water benthonic over the planktonic forms suggests shallow marine setting.

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Journal Info

Abbrev

SCOG

Publisher

Subject

Chemical Engineering, Chemistry & Bioengineering Earth & Planetary Sciences Energy Environmental Science

Description

research activities, technology engineering development and laboratory in the oil and gas field including regional geology/basin modeling, petroleum geology, sedimentology, stratigraphy, petroleum geoscience, drilling and completion technology, production engineering, well simulation, formation ...