| Summary: | The Reira Field is deposited in a fluvio-deltaic environment in the prolific Kutai
Basin, in East Kalimantan. For more than 30 years, the majority of the production came
from large reservoirs with high-permeability intervals, characterized by standard and
near-ideal well log shapes. However, a number of potential pay zones with non-ideal log
shapes, including low resistivity reservoirs were initially bypassed leaving significant
reserves in the ground. This thesis discusses the reason of the low resistivity zones in the
Reira Field, petrophysical correction to obtain optimum saturation water, and
identification of potential candidates of low-resististivity pay zones. This research
starting by log identification of proven low-resistivity pay zones in Reira Field.
Afterwards, integrated analysis of logs, core, thin sections, XRD (conductive minerals
and clay minerals identification), SEM, fluid analysis test(MDT), and dipmeter data
have been carried out to reveal the reasons of its occurrence in the Reira Field. Presence
of illite-smectite as clay minerals and pyrite-siderite-ankerite as conductive minerals
become one of the main reasons of low-resistivity occurence in Reira Field. Modification
of Rw by pickett plot and utilization of some Sw calculation method have been examined
to obtain optimum result of Sw value. At the final stage, identification of mudlog, well
log, and fluid analysis test have been conducted in all wells in Reira Field to discover
potential candidates across Reira Field. I-72C zone in R-46 well were perforated using
the recommendations from the integrated analysis, which have proven these low
resistivity zones as hydrocarbon bearing pay zones. Currently, that zones have produced
more than 125 MMCFD of gas and are still flowing. Others wells which are R-94 and R-
92 revealed oil and condensate. More than 69 zones have been identified as potential
candidatas of low-resistivity pay zones for future perforation.
|
|---|