Gravity tectonics in Indonesia: Petroleum implications

Proceedings, Indonesian Petroleum Association

Thirty-Seventh Annual Convention & Exhibition, May 2013

 

Gravity tectonics in Indonesia: Petroleum implications

Awang Harun Satyana*

* SKK Migas

 

Abstract

Gravity tectonics is about tectonic movement due to differential gravity between Earth’s layers or two adjacent areas (primary vertical endogenic force/tectogenesis) and its ensuing gravitational reactions (secondary lateral tectogenesis) . This movement thoroughly concerns with equilibrium or isostatic compensation. The origins of uplifts in the collision zones of Indonesia (Meratus Uplift-SE Kalimantan; Batui Uplift-eastern Sulawesi, Papua’s Central Ranges Uplift , and Timor-Tanimbar Uplift) are satisfied explained by gravity tectonics. In these cases, vertical movement due to isostatic exhumation of once subducted micro-continent/ continent in collision zones provides mechanism for the uplifts. The origins of regional compressive structures such as Samarinda Anticlinorium, eastern Kalimantan, offshore North Makassar toe thrusts, and North Serayu fold-thrust belt, northern Central Java are considered as secondary lateral tectogenesis of gravity tectonics. Their mechanisms of deformation are through gravitational gliding/sliding (gliding tectonics), compensating differential gravity due to hinterlands uplifts. Gravity tectonics is essential in forming some elements and processes of petroleum system. It forms foreland basin; structural traps, mostly thinskinned; and deposition of syn- and post collisional sediments burying sources to depth of oil and gas windows. The paper will discuss some areas in Indonesia with structures related to gravity tectonics and their implications for petroleum accumulation.

 

Read pdf

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s