THE IDENTIFICATION AND STRUCTURE CONTROL OF LIMESTONE DEVELOPMENT IN N11-N14 INTERVAL NGIMBANG SUB BASIN
Paleogen Ngimbang Sub Basin is a part of North East Java Basin which is located in the eastern part to southeast of East Cepu High. The east part of this Sub Basin is bordered by Kemandung Ridge with orientation northeast – southwest, and it seems to be controlling the development of half graben,...
Saved in:
| Main Author: | |
|---|---|
| Format: | Theses |
| Language: | Indonesia |
| Subjects: | |
| Online Access: | https://digilib.itb.ac.id/gdl/view/74296 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Paleogen Ngimbang Sub Basin is a part of North East Java Basin which is located
in the eastern part to southeast of East Cepu High. The east part of this Sub Basin is
bordered by Kemandung Ridge with orientation northeast – southwest, and it seems
to be controlling the development of half graben, with a slope face to the northwest.
In that area, there are not many researches done to find the presence of N11-N14
limestone, which was proven to be in Tapen-1 well. The background of this
research is the result of 2D seismic acquisition in 2007 in the research area which
shows the presence of Middle Miocene coral limestone buildup reflection pattern at
N11-N14 lifespan.
The method used in this research is divided into two parts which is done in parallel,
which are confirming the probability of the form of limestone in 2D seismik data by
using seismik attribute and isochrone map, then proving the presence of limestone
in the research area by geology analysis, which is by analyzing the development of
the structure.
The analysis of seismik attribute shows the reflection pattern of mounded form,
along with the onlap which grows on limestone’s buildup. The reconstruction of
structure which is made at the 2D seismik data shows the elevation event from N9
to N14 lifespan, when research area that used to be insides, is kept on elevating
until it becomes shelf at N11 lifespan. This analysis is also supported by the burial
history data of Ngimbang-1 well. Then from the sequence stratigraphy analysis,
using the log Gamma Ray data of Tapen-1, it shows that there is a repetition of
several HST phases, which enables the development of limestone in the research
area.
From the research analysis, it can be concluded that N11-N14 limestones develop
in shelf environment in the research area. |
|---|